A multi-service multiplexer for local terminal equipment

Abstract

The present application provides a multi-service multiplexer for local equipment, which relates to the field of multiplexing communication technology, including: a secondary multiplexing and demultiplexing unit, a multicast service unit, a main and standby power supply unit, and M primary multiplexing and demultiplexing units, wherein: the secondary multiplexing and demultiplexing unit includes: a core network data service interface, a secondary multiplexing and demultiplexing module, a network management interface, a network management module, a main control CPU module, a storage module, and M data service interfaces; the multicast service unit includes: a core network side multicast service interface, a multicast service relay module and an interface; the main and standby power supply unit includes: a main and standby power supply module and a main and standby power supply management module; the primary multiplexing and demultiplexing unit includes: a data service interface and a multicast service interface, a primary multiplexing and demultiplexing module, an integrated optoelectronic conversion transceiver, a multi-core pigtail, and a multi-core pigtail adapter. Through the above scheme, the access network of the local end solves the problem of excessively high costs in upgrading the PON network.

Description

Technical Field

[0001] The present application belongs to the field of multiplexed communication technology, and in particular, relates to a multi-service multiplexer of a local end device. Background Art

[0002] At present, the mainstream technology used in the access network field is Passive Optical Network (PON) technology. The transmission method of PON network downstream data is to modulate the downstream data of multiple users onto the same downstream wavelength and transmit it in a point-to-surface broadcast manner. N users share a core optical fiber under a PON port and access a PON port through a 1 / N optical splitting mode to receive their respective data. In the transmission of upstream data, in order to make the upstream data and the downstream data share a physical channel, the upstream data of multiple users are modulated onto the same upstream wavelength in a time-division multiplexing mode, and then transmitted to the same PON port corresponding to the downstream data. The network shape is a tree structure. In order to adapt to the two-way business mode of transmission on the comb network, the PON network must be equipped with a home gateway ONU in the user's home to realize the reception and upload of user data. Therefore, the PON network is like Figure 1 As shown in the figure, it is mainly composed of the central office equipment OLT (Optical Line Terminal), tree-structured ODN (Optical Distribution Network), and home gateway (ONU).

[0003] Depend on Figure 1 It can be seen that the access network service port node (SNI) at the upper end of the PON network central office equipment OLT is the connection point between the access network and the core network; the connection point between the home ONU and the user CPN (Customer Premises Network) is the access network user port function node. The PON network adopts a tree-structured ODN in which each PON port of the OLT is connected to N users after passing through a 1:N optical splitter. Therefore, the PON technology access network mainly consists of three parts: the PON network central office equipment OLT, the tree-structured ODN in which N users share one core optical fiber, and the home gateway ONU. The biggest advantage of the PON network is that multiple users share one core optical fiber under one PON port and access multiple users under a tree-structured structure with power distribution, thereby saving a lot of optical fiber resources from the access network central office to the building head, but the PON network also has the following problems:

[0004] 1) Since the ODN part adopts a point-to-multipoint tree network architecture, multiple users share a PON port resource and a core fiber resource before the 1:N splitter, and the upstream data must adopt a time-division multiplexing transmission mechanism, so the OLT cannot provide the access network user-side interface function UNI point, and must be equipped with a home gateway ONU. The OLT and ONU jointly complete the time-division multiplexing and demultiplexing of the upstream data, resulting in the access network user interface function UNI point moving down to the home ONU user-side interface, which can be connected to the user's residential network and fully realize the access network interface definition and function definition. However, the entry of ONU into the user's home not only increases the home access cost in the early stage of network construction, but also requires the subsequent system upgrade to increase the upgrade cost of the user-side ONU equipment. The upgrade of the access network system is always related to the user side.

[0005] 2) Shared fiber PON technology reduces the investment cost of access networks when fiber media is expensive, but network equipment becomes more complicated, and the cost of each generation upgrade will increase significantly. In the iterative upgrade of PON networks, the cost of equipment is getting higher and higher. Every time the average access bandwidth per household doubles, the equipment cost also increases by about twice, or even more than twice.

[0006] 3) After the optical splitter, multiple ONUs share one PON port resource. Under the 1:N splitting condition, 1 / N of the PON port bandwidth resources are obtained. Even if the PON port bandwidth is upgraded from 1 Gigabit to 10 Gigabit, the bandwidth allocated to each user is only increased by tens of megabits. However, the physical interface of the ONU itself and the physical interface of the OLT must be upgraded to the same level of high-speed interface. This is also the reason why the home ONU must be upgraded when the system is upgraded and the main reason for the high cost of upgrading, which is bound to bring a huge burden of repeated investment to network operations.

[0007] 4) In terms of downstream data transmission, whether it is unicast data or multicast data of users, OLT transmits all in broadcast mode, and ONU selectively receives the data it wants. However, the amount of downstream broadcast data is not fixed. When the number of user requests reaches a certain level, the limited downstream bandwidth will still affect the user experience. At the same time, a very high security mechanism must be in place to protect the security of user data.

[0008] 5) Uplink data is transmitted in a time-division multiplexing manner. Multiple ONUs transmit data according to the window time allocated by the OLT. In order to reduce the cost of home ONUs, traditional PON systems generally adopt an asymmetric solution with large downstream and small upstream. When the business is busy, insufficient upstream bandwidth is prone to occur, affecting user experience.

[0009] 6) In traditional PON equipment, although the ONU of each manufacturer meets the user-side access network interface definition specifications, each manufacturer's LOT and ONU have some private protocols, which affects the interconnection and interoperability between LOT and ONU of different manufacturers.

[0010] 7) PON network, in order to achieve broadcasting services, communication services, and broadband Internet services sharing the same transmission channel resources, the transmission of radio and television services uses IPTV (Internet Protocol Television System) technology, especially in the transmission of radio and television live broadcast services, which are also transmitted according to interactive multicast technology. The results are: first, more multicast replication points are built in the core network to reduce the pressure of multicast services on the access network, resulting in an increase in the investment cost of core network equipment; second, multicast service protection bandwidth must be reserved in the transmission link, increasing the investment cost of network bandwidth; third, in order to transmit large-grained long-connection video services on limited household bandwidth, the video service is deeply compressed, which makes it impossible to achieve broadcast-level transmission quality and meet the broadcast-level standard transmission of 4K / 8K ultra-high-definition programs. Even if the video bit rate is greatly compressed and the multicast replication transmission technology is used, these services still occupy a large amount of bandwidth resources in the core network and access network in the transmission network. At least 30% of the protection bandwidth needs to be reserved in the transmission link. If the traffic bandwidth of the live program itself is added, the live broadcast service will consume more than 40% of the network bandwidth of the total resources of the transmission system. This is a huge consumption of network resources, which is also the fundamental reason for the continuous upgrading and expansion of PON networks. In order to save as much resource consumption as possible, IPTV technology must first increase the investment in core network replication points, and secondly, compress the video bit rate of broadcasting and television services as much as possible, which results in the transmission program quality failing to meet the broadcast-level transmission quality, especially the transmission of 4K and 8K ultra-high-definition programs in the future, which is a big challenge.

[0011] Among the above-mentioned problems, the most important one is the cost problem caused by upgrading, and the cost increase mainly comes from two aspects: first, the optical port of OLT and ONU is upgraded from Gigabit to 10 Gigabit, and second, the equipment chip is upgraded from Gigabit processing chip to 10 Gigabit processing chip. In the future, it will also need to be upgraded to 25GPON, 50GPON, and even upgraded to NGPON and TWDM-PON, which will inevitably lead to an increase in investment costs. Although the cost of upgrading has increased greatly, the improvement of user access bandwidth is limited, resulting in the continuous upgrading of PON network. The life cycle of equipment in the network is far less than the life cycle of the equipment itself, resulting in operators needing to continuously increase costs in order to meet users' increasing demand for home bandwidth.

[0012] There is no effective solution to the problem of high cost in upgrading the existing PON network. Summary of the invention

[0013] The purpose of the present application is to provide a central office equipment multi-service multiplexer, which can solve the problem of high cost in upgrading the existing PON network by using the device as the access network of the central office.

[0014] A multi-service multiplexer for local end equipment comprises: a secondary multiplexing and demultiplexing unit, a multicast service unit, a primary and secondary power supply unit, and M primary multiplexing and demultiplexing units, where M is a positive integer, wherein:

[0015] The secondary multiplexing and demultiplexing unit includes: a service side core network data service interface, a secondary multiplexing and demultiplexing module, a network management interface, a network management module, a main control CPU module, a storage module, an I / O management CPU module and M data service interfaces that can be connected to M primary multiplexing and demultiplexing units;

[0016] The multicast service unit includes: a core network side multicast service interface, a multicast service relay module and M multicast service interfaces that can access M primary multiplexing and demultiplexing units;

[0017] The main and standby power supply module includes: an AC protection module, a rectifier module, a switching power supply module, a DC protection module, a power management module and a main and standby power supply switching module. The main and standby power supply management module includes: a main and standby power supply switching module that supports hot plugging; the power interface of the main and standby power supply unit uses a power supply bus as the power supply bus interface of the integrated model, and the main and standby power supply unit adopts an independent plug-in board to supply power to each functional unit through the backplane interface. The first-level multiplexing and demultiplexing unit includes: a data service interface and a multicast service interface that can be connected to the second-level multiplexing and demultiplexing unit and the multicast service relay module, a first-level multiplexing and demultiplexing module, W user-side multi-channel integrated optoelectronic conversion transceivers, multi-core pigtails and multi-core pigtail adapters, where W is a positive integer.

[0018] In one embodiment, the core network side of the secondary multiplexing and demultiplexing unit is provided with a multi-rate service function interface having an access network SNI function node to meet the connection requirements with the core network, wherein the multi-rate includes the following: 10G, 25G and 100G;

[0019] The secondary multiplexing and demultiplexing unit includes: an optional rate data service interface for accessing M primary multiplexing units to meet the access requirements of the M primary multiplexing and demultiplexing units, wherein the optional rates include: 10G and 25G.

[0020] In one embodiment, each primary multiplexing and demultiplexing unit is provided with a 10G or 25G data service interface connected to the secondary multiplexing and demultiplexing unit, and is connected to one of the M data service interfaces provided by the secondary multiplexing and demultiplexing unit through the 10G or 25G data service interface to realize the access, cross-connection, multiplexing and transmission functions of communication services, broadband Internet services and data services;

[0021] Each primary multiplexing and demultiplexing unit is also provided with a 10G or 25G multicast service interface connected to the multicast service unit, and is connected to one of the M multicast service interfaces provided by the multicast service unit through the 10G or 25G multicast service interface, so as to forward the content requested by the user to listen or watch to the user through the multicast to unicast mechanism;

[0022] The first-level multiplexing and demultiplexing unit is provided with a user interface with a selectable rate of Gigabit or 10 Gigabit and the function of the access network user function node UNI, and is converted into a multi-channel optical interface through a multi-channel integrated optoelectronic conversion transceiver on the user side, and then the pigtail of the multi-channel optical interface is adapted into a multi-core pigtail, and then connected to the multi-core pigtail adapter, and each pigtail of the multi-core pigtail adapted by the multi-core pigtail adapter is connected to a single-core optical fiber exclusively used by each user of the access network, so that each user has an exclusive single-core optical fiber access to the user-side interface of the multi-service multiplexer of the central office equipment.

[0023] In one embodiment, the number of user interfaces set in each first-level multiplexing and demultiplexing unit is m, and the value of m is one of the following: 48, 64, 96, and it is converted into a multi-channel optical interface through W multi-channel integrated optoelectronic conversion and transceiver devices, and the value of W is one of the following: 4, 6, 8, where m and W are positive integers.

[0024] In one embodiment, the user-side multi-channel integrated optoelectronic conversion transceiver of the primary multiplexing and demultiplexing unit includes: a multi-grid integrated optical transceiver core mounting base, a pigtail fiber compartment, a multi-core pigtail lead-out hole, a multi-core pigtail, and a multi-core pigtail adapter female head, wherein:

[0025] An integrated base with L grids is provided in each multi-channel integrated optoelectronic conversion and transceiver device. In each grid, an optoelectronic conversion tube core with 1 receiving and 1 transmitting, a preamplifier circuit, a combiner / splitter wave plate, a pigtail adapter and a single-core pigtail led out of the pigtail adapter are installed respectively. The single-core pigtail led out of the combiner / splitter wave plate in each grid is orderly coiled in a fiber coiling cabin at the rear end of the L grid integrated base, and then converged into a multi-core pigtail with L cores. The multi-core pigtail with L cores is fixed in the fiber coiling cabin for tensile resistance, and then led out through the lead-out hole of the fiber coiling cabin. After the led-out multi-core pigtail reserves a preset length, it is connected to the multi-core pigtail adapter female head, wherein L is a positive integer, and the value of L is one of the following: 12, 16, 24.

[0026] In one embodiment, the central office equipment multi-service multiplexer includes at least one of the following: a plug-in type multi-service multiplexer, an integrated type multi-service multiplexer, and a split type mother-child type multi-service multiplexer.

[0027] In one embodiment, in an integrated multi-service multiplexer, the core modules of the secondary multiplexing and demultiplexing unit, the multicast service unit, the primary and secondary power supply units, and the primary multiplexing and demultiplexing unit are deployed on a circuit board in a chassis, and the internal bus and the external physical interface between the functional units are configured to form the functional units of the multi-service multiplexer, wherein the PCie high-speed data interfaces of the secondary multiplexing and demultiplexing unit and the primary multiplexing and demultiplexing unit are connected through a bus, and the core module of the secondary multiplexing and demultiplexing unit has 1 to 8 PCie interfaces, which can be connected to 1 to 8 primary multiplexing and demultiplexing units.

[0028] In one embodiment, in a plug-in type multi-service multiplexer, a secondary multiplexing and demultiplexing unit, a primary and secondary power supply unit, a multicast service unit, and a primary multiplexing and demultiplexing unit respectively form independent functional boards, which are connected to form a complete multi-service multiplexer through a plug-in interface, and the PCie high-speed data interfaces of the secondary multiplexing and demultiplexing unit and the primary multiplexing and demultiplexing unit are connected through a bus, and the core module of the secondary multiplexing and demultiplexing unit has 1 to 8 PCie interfaces, which can be connected to 1 to 8 primary multiplexing and demultiplexing units;

[0029] Among them, the secondary multiplexing and demultiplexing unit is the main board, the main and standby power supply units and the relay forwarding units in the multicast service unit are independent functional boards, and the primary multiplexing and demultiplexing unit is a sub-board. The main board, independent functional board and sub-board are all made into independent plug-in boards and inserted into the backplane interface to connect with each other to form a multi-service multiplexer. Among them, each primary multiplexing and demultiplexing unit sub-board can be configured with a 48-port or 96-port user-side interface.

[0030] In one embodiment, in a split-type mother-child multi-service multiplexer, the relay forwarding unit, the secondary multiplexing and demultiplexing unit, and the main and standby power supply units in the multicast service unit form a host with a plug-in structure, a primary multiplexing and demultiplexing unit and an independent power supply unit form a sub-machine, and multiple primary multiplexing and demultiplexing units and multiple independent power supply units form multiple sub-machines. Multiple 10G / 25G rate interfaces are equipped between the host and the sub-machine to realize the access of multiple sub-machines. The multicast service optical port and the multicast service optical port, and the data service optical port and the data service optical port between the host and the sub-machine are respectively connected by optical fibers, and the user side of the sub-machine can provide 24, 32, 48, 64, and 96 interface specifications.

[0031] The central office equipment multi-service multiplexer provided in the above example is an all-optical broadband access network based on Ethernet technology and exclusive optical fiber multi-service multiplexing, which provides users with access to multiple services such as data services, broadband Internet, communication services, and video services, thereby meeting the needs of access network with a wide variety of services, low service density, high access density, low coverage cost, and low home access cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a schematic diagram of the structure of a PON network;

[0034] Figure 2 This is a structural diagram of a multi-service multiplexing exclusive optical fiber access network system with the multi-service multiplexer provided by the present application as the central office;

[0035] Figure 3 It is a principle block diagram of the multi-service multiplexer provided by this application;

[0036] Figure 4 It is a schematic diagram of a multi-channel integrated photoelectric conversion component provided by the present application;

[0037] Figure 5 It is a schematic diagram comparing the transmission model of the core network, the convergence layer and the access layer in a multicast replication mode provided by the present application with the existing transmission model;

[0038] Figure 6 This is a schematic diagram of an all-optical broadband access network based on Ethernet technology and exclusive optical fiber multi-service multiplexing;

[0039] Figure 7 This is a schematic diagram of the interface definition of the core module of the secondary multiplexing / demultiplexing unit provided by the present application;

[0040] Figure 8 It is a structural diagram of the core module of the main and standby power supply unit provided by the present application;

[0041] Fig. 9 It is a schematic diagram of the interface definition of the core module of the multicast service relay forwarding unit in the multi-service multiplexer provided by the present application;

[0042] Fig.10 This is a schematic diagram of the interface definition of the core module of the primary multiplexing and demultiplexing unit provided by this application;

[0043] Fig.11 It is a block diagram of the interface definition principle of the secondary multiplexing / demultiplexing unit in the integrated multi-service multiplexer model provided by the present application;

[0044] Fig.12 It is a structural diagram of the main and standby power supply modules provided by this application;

[0045] Fig.13 It is a schematic diagram of an implementation scheme of a multicast service relay forwarding unit in an integrated model provided by the present application;

[0046] Fig.14 It is a structural schematic diagram of the primary multiplexing / demultiplexing unit implementation scheme of the integrated model provided by the present application;

[0047] Fig.15 It is a schematic diagram of a plug-in type multi-service multiplexer provided in the present application;

[0048] Fig.16 It is a block diagram of the interface definition principle of the secondary multiplexing / demultiplexing unit of the plug-in type of multi-service multiplexer provided by the present application;

[0049] Fig.17 It is a schematic diagram of the implementation scheme of the main and standby power supply unit of the plug-in type machine provided by the present application;

[0050] Fig.18 It is a structural diagram of an implementation scheme of a plug-in type multicast service relay forwarding unit provided by the present application;

[0051] Fig.19 It is a structural schematic diagram of an implementation scheme of a plug-in type primary multiplexing / demultiplexing unit provided by the present application;

[0052] Fig. 20 It is a schematic diagram of the implementation of the solution of the multi-service multiplexer for the split-type mother-child machine model provided by the present application;

[0053] Fig.21 It is a block diagram of the interface definition principle of the secondary multiplexing / demultiplexing unit in the multi-service multiplexer mother-child machine model provided by this application;

[0054] Fig. 22 It is a structural schematic diagram of the main and standby power supply unit boards of the main and sub-machine models provided by this application;

[0055] Fig.23 It is a schematic diagram of the implementation scheme of the multicast service relay unit of the parent-child machine type provided by this application;

[0056] Fig.24 It is a schematic diagram of the implementation scheme of the primary multiplexing / demultiplexing unit of the mother-child machine model provided by this application;

[0057] Reference numerals in the above drawings:

[0058] 1. Multicast service interface; 2. Network management interface; 3. Data service interface; 4. USB interface; 5. Power interface; 6. Secondary multiplexing / demultiplexing unit; 7. Network management module; 8. Storage module; 9. Secondary multiplexing module; 10. Main control CPU; 11. Input and output management module; 12. Data service bus; 13. Main and standby power supply units; 14. Main power supply module; 15. Standby power supply module; 16. Power management module; 17. Multicast service relay forwarding unit; 18. Multicast service relay unit core module; 19. Power supply bus; 20. Management bus; 21 , multicast service bus; 22, primary multiplexing / demultiplexing unit; 23, primary multiplexing / demultiplexing unit core module; 24, user side data interface; 25, multi-channel integrated optoelectronic conversion transceiver; 26, multi-core pigtail; 27, multi-core pigtail adapter; 28, multi-core pigtail adapter; 29, central office equipment multi-service multiplexer; 30, multi-core pigtail adapter interface; 31, multi-core pigtail (pigtail outside the box); 32, central office cabinet ODF terminal board; 33, central office cabinet to corridor cabinet multi-core 34. ODF terminal board in the user end box; 35. Fiber optic cable; 36. Fiber optic access to the user; 37. Fiber optic transceiver; 38. Wireless port router; 39. Fiber optic router; 40. Integrated multi-channel signal photoelectric conversion transceiver assembly; 41. Transmitter core lead pin; 42. Receiver core lead pin; 43. Multi-core pigtail fiber tray; 44. Optical signal adapter after the combiner / demultiplexer in each grid; 45. Single-core pigtail; 46. Multi-channel pigtail lead hole; 88. Multi-core pigtail (in the box) pigtail); 47, first plug interface; 48, backplane; 49, first interface of backplane; 50, second interface of backplane; 51, second plug interface; 52, primary multiplexing / demultiplexing unit of plug-in type; 53, data service optical fiber interface; 54, core module of multicast service relay unit of plug-in type; 55, multicast service optical fiber interface; 56, daughter machine of plug-in type; 57, multicast service interface of daughter machine of plug-in type facing secondary multiplexing unit; 58, data service interface facing secondary multiplexing unit. DETAILED DESCRIPTION

[0059] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0060] In view of the high cost of upgrading the access network of the existing PON technology, the cost increase mainly comes from: first, the optical port of OLT and ONU is upgraded from 1000M to 1000M, and the user-side ONU needs to be replaced when the central office equipment is upgraded; second, the equipment chip is upgraded from 1000M processing chip to 1000M processing chip, and in the future, it will even be upgraded to 25GPON, 50GPON, or NGPON, TWDM-PON, so the investment cost will increase significantly. Although the cost of upgrading has increased greatly, the improvement of user access bandwidth is limited, which will lead to the continuous upgrading of PON network. The life cycle of equipment in the network is much shorter than the life cycle of the equipment itself, which leads to the need for operators to upgrade many times in order to meet the continuous improvement of user access bandwidth.

[0061] The reason for the above problems is that N users share a PON port bandwidth resource under 1:N optical splitting. In order to provide users with greater access bandwidth, the PON network has a development trend from the current GPON and 10GPON to 50GPON, NGPON and TWDM-PON. At this time, the technology of the central office equipment and terminal gateway is more complex and the cost will be higher, especially TWDM-PON, which superimposes wavelength division multiplexing technology on the current time division multiplexing technology, and the equipment cost will be higher. Although the development of the PON network from the current EPON, GPON, XG-PON to 50GPON, NGPON and TWDM-PON is to better protect the original network architecture and the original investment in optical fiber media, this protection is not objected when the optical fiber media is expensive. However, the price of optical fiber media bare fiber has dropped from 1,000 yuan / core kilometer to 50 yuan / core kilometer. If the already low media cost is still protected by upgrading expensive equipment technology, the best adaptation of transmission media and equipment technology will be lost, resulting in repeated investment costs and higher upgrade costs.

[0062] Based on this, in this example, a multi-service multiplexing central office device based on Ethernet technology is provided, which can be used in a multi-service multiplexing exclusive optical fiber access network system based on Ethernet technology. The system diagram is shown in the attached figure. Figure 2 As shown, it includes: a central office equipment multi-service multiplexer 29, an optical cable connection terminal board 32 in the central office cabinet (i.e., an ODF terminal board in the central office cabinet), a multi-core optical cable 33 from the central office cabinet to the corridor cabinet, a terminal board 34 in the corridor cabinet (i.e., an ODF terminal board in the user cabinet), a single-core home optical fiber 35 for each user, and a fiber-to-home user 36. The wireless port router 38 of the fiber-to-home user can be connected to the home optical fiber 35 through a fiber optic transceiver 37, and can also be equipped with a fiber optic router 39 to connect to the home optical fiber 35.

[0063] The multi-service multiplexing central office equipment provided in this example is applied to the central office of the exclusive optical fiber multi-service multiplexing all-optical network broadband access network based on Ethernet technology, providing users with access to multiple services such as data services, broadband Internet, communication services, and video services. And the multi-service multiplexer can meet the requirements of a wide variety of access network services, low service density, high access density, low coverage cost, and low home access cost. In one embodiment, the central office equipment multi-service multiplexer of this example is an access network central office equipment multi-service multiplexer.

[0064] Specifically, the multi-service multiplexer can realize some functions of the OLT in the existing PON network, but the multi-service multiplexer in this example is completely different from the OLT in the PON network. In this example, the user accesses the user side of the multi-service multiplexer in an exclusive optical fiber mode, and the strip network structure replaces the PON network tree network structure, thereby canceling the transmission mechanism that must use time division multiplexing technology under the tree network architecture of shared optical fiber in the PON network, thereby canceling the ONU equipment that must be equipped in the user's home. When the user accesses the user side of the multi-service multiplexer based on Ethernet technology in an exclusive optical fiber mode, the user's home does not need to be equipped with an access gateway similar to the ONU, thereby eliminating the cost of the operator's equipment entering the home.

[0065] The service side of the above-mentioned multi-service multiplexer can provide interfaces for communication services including but not limited to 10G / 25G / 100G rates and broadband Internet data services to access the metropolitan area network. At the same time, the service side can also independently set a multicast service interface with a transmission rate including but not limited to 10G / 25G rates, so that there is no need to set a multicast replication point for the IPTV multicast service in the core network. All IPTV multicast services are transmitted to the access network bureau in a relay manner, and accessed to the multicast service relay forwarding unit of the multi-service multiplexer through an independent channel. The relay forwarding module of the relay forwarding unit forwards all multicast services to the first-level multiplexing and demultiplexing module of the multi-service multiplexer, and the first-level multiplexing and demultiplexing module distributes the multicast services required by the user to the end user in a multicast-to-unicast manner. This approach can reduce the investment cost of multicast replication points in the core network on the one hand, and improve the resource utilization of access network data service links on the other hand. There is no need to reserve 30% protection bandwidth for multicast services. Furthermore, the transmission quality of IPTV multicast HD, ultra-HD 4K / 8K, and AR / VR video services can be improved, so that the transmission quality of IPTV multicast services reaches broadcast-level transmission standards.

[0066] The user side of the above-mentioned multi-service multiplexer can provide high-density optical interfaces including but not limited to gigabit / 10 gigabit rates, so that each access user can access the user-side interface of the multi-service multiplexer through a comb network ODN with a dedicated optical fiber. Without the need for an access gateway at home, the user can access the home electrical port WiFi router through an optoelectronic converter, or access the home optical fiber WiFi router, and access other indoor application terminals through the WiFi router, thereby realizing full service access such as data services, communication services, broadband Internet services, IPTV services, and cable TV live broadcast services.

[0067] That is, through the strip network architecture from multi-service multiplexer to corridor, corridor to home, each household has its own optical fiber, to replace the PON network terminal to corridor tree network structure and the ONU gateway architecture in the user's home, so as to achieve the purpose of replacing the home gateway ONU equipment in the PON network with low-cost optical fiber.

[0068] Specifically, the above-mentioned multi-service multiplexer can be as follows Figure 3 As shown, it consists of a secondary multiplexing / demultiplexing unit, a multicast service unit, a primary / standby power supply unit and a primary multiplexing / demultiplexing unit. The multi-service multiplexer is a local-end device of an exclusive optical fiber multi-service multiplexing all-optical network broadband access network based on Ethernet technology. It can be combined with an ODN in which each household has an exclusive optical fiber to form an exclusive optical fiber broadband access system based on Ethernet technology.

[0069] Among them, the above-mentioned secondary multiplexing / demultiplexing main unit can be composed of a service side core network data service interface, a secondary multiplexing / demultiplexing module, a network management interface, a network management module, a storage module, a main control module CPU block, an I / O management CPU module and a high-speed data interface facing the primary multiplexing / demultiplexing unit. The core functions of the secondary multiplexing / demultiplexing main unit are composed of two major parts: one is to re-multiplex and distribute the multiplexed signaling and services of the primary multiplexing / demultiplexing module to the core network, and the other is to provide access network core functions, transmission functions and service side node functions according to the access network definition. The service side interface of the multi-service multiplexer is connected to the metropolitan area network through one or several optical ports with rates including but not limited to 10Gbps, 25Gbps or 100Gbps. The line supports IEEE802.3 10GBase-R or higher rate optical fiber Ethernet standards and can be connected to the BRAS broadband access server of the metropolitan area network.

[0070] The secondary multiplexing / demultiplexing unit can provide multiple channels including but not limited to 10 Gigabit high-speed data interfaces for the primary multiplexing / demultiplexing unit, and can access multiple primary multiplexing / demultiplexing units. The line supports the IEEE802.31000Base-X standard, and realizes the uplink data aggregation of multiplexer access users, the allocation of downlink data, dynamic bandwidth allocation (DBA), bandwidth control strategy execution, port address binding, multicast message replication, QoS priority forwarding, MAC address modification and replacement, etc.

[0071] Among them, the above-mentioned first-level multiplexing / demultiplexing unit can be composed of a high-speed data interface for the second-level multiplexing / demultiplexing unit and the forwarding unit in the multicast service, a first-level multiplexing / demultiplexing module, a multi-channel integrated optoelectronic conversion transceiver on the user side, and a high-density pigtail adapter interface. The core functions of the first-level multiplexing / demultiplexing unit are composed of three parts: first, the multiplexing / demultiplexing and distribution of exclusive optical fiber multi-user signaling and data services, Internet services, communication services, and multicast services; second, according to the definition of the access network, it provides access network core functions, transmission functions, and user-side node functions; third, to meet the characteristics of the access network with many types of services, low traffic density, and high interface density, in order to enable the user side to access more users, the first-level multiplexing / demultiplexing unit of the multi-service multiplexer can be composed of multiple first-level multiplexing / demultiplexing modules, and each first-level multiplexing / demultiplexing module can provide including but not limited to 48, 96 channels, including but not limited to gigabit / 10G data interfaces.

[0072] The multi-service multiplexer of the local equipment provided in the above example includes: a secondary multiplexing unit and M primary multiplexing units, where the number of M includes but is not limited to 4, 6, and 8; each primary multiplexing unit provides m user interfaces on the user side, and the value of m includes but is not limited to 48, 64, and 96; and after being converted into optical signals by W multi-channel integrated optoelectronic conversion devices, they are connected to the multi-core fiber pigtail adapter seat on the chassis panel through multi-core fiber pigtails and multi-core fiber pigtail adapter female heads, so as to dock with the multi-core fiber pigtail adapter male head outside the chassis, and realize the access of each user to a single core optical fiber. The W value of the multi-channel integrated optoelectronic conversion device of each primary multiplexing unit includes but is not limited to 4, 6, and 8; the number of channels of each multi-channel integrated optoelectronic conversion device is L; thus, N=M*W multi-core fiber pigtail adapter seats can be provided on the chassis panel of the entire machine, where W=m / L.

[0073] If the letter n is used to represent the number of users that can be connected to each multi-service multiplexer, then the number of users that can be connected to each multi-service multiplexer is n=M*m=M*W*L=N*L.

[0074] According to the above statement:

[0075] M includes but is not limited to 4, 6, and 8; (the number of primary multiplexing units in each multi-service multiplexer)

[0076] m includes but is not limited to 48, 64, and 96; (number of user-side interfaces for each primary multiplexing module)

[0077] W includes but is not limited to 4, 6, 8; (the number of multi-channel integrated photoelectric converters for each primary service unit)

[0078] N includes but is not limited to = M*W; (the number of multi-core pigtail adapters for each multi-service multiplexer)

[0079] L includes but is not limited to 12, 16, 24; (the number of optical-to-electric converters in a multi-channel integrated optical-to-electric conversion transceiver or the number of fiber cores in a multi-core fiber pigtail)

[0080] Therefore, the number of access users of each multi-service multiplexer n=M*m=M*W*L=N*L is a variety of combinations, including but not limited to 192, 256, 384, 512 and 768 users.

[0081] The Ethernet technology is used as the exclusive fiber optic multi-service multiplexing all-optical broadband access network at the local end through a multi-service multiplexer, providing users with access to multiple services such as data services, broadband Internet, communication services, and video services, thereby meeting the needs of access networks with a wide variety of services, low service density, high access density, low coverage cost, and low home access cost.

[0082] The above-mentioned user-side multi-channel integrated optoelectronic conversion transceiver device and multi-core pigtail adapter optical fiber interface can be composed of a multi-channel integrated optoelectronic conversion transceiver device and a multi-core pigtail adapter.

[0083] The user side of the first-level multiplexing / demultiplexing module of the above-mentioned multi-service multiplexer may include but is not limited to a Gigabit / 10 Gigabit multi-channel uplink and downlink data interface, the uplink and downlink data signals of the interface are converted into optical signals through multi-channel integrated including but not limited to Gigabit / 10 Gigabit photoelectric conversion transceiver components, and adapted to the multi-core fiber pigtail adapter on the multiplexer panel through its multi-core fiber pigtail. The multiplexer panel can provide N multi-core fiber pigtail adapters, and the number of fiber pigtail cores adapted by each fiber pigtail adapter includes but is not limited to 12-core, 24-core, and 48-core fiber pigtails, so that each multiplexer can adapt to 192-core, 256-core, 384-core, 512-core, and 768-core fiber pigtails through N multi-core fiber pigtail adapters, and connect to the access network's multi-core optical cable in the access network's local end junction box. Each core in the multi-core optical cable is connected to one user, forming a broadband access network in which each user has an exclusive core of optical fiber.

[0084] The above-mentioned multi-channel integrated photoelectric conversion transceiver assembly, the schematic diagram of the multi-channel integrated photoelectric conversion assembly is attached Figure 4As shown. In each grid of the integrated multi-grid base, the optical transceiver core, the combiner / demultiplexer wave plate and the pigtails from the pigtail adapter are installed respectively to form an integrated multi-channel optoelectronic conversion transceiver. Compared with the single optoelectronic conversion component, the volume is reduced and the space occupied on the printed board is reduced, so that more optical interfaces can be matched with the primary multiplexing / demultiplexing module that can support high-density interfaces. The pigtails adapted by the multi-channel optical module pigtail adapter are coiled and converged into a multi-channel pigtail bundle in the fiber coiling cabin at the rear end of the integrated base. The pigtail bundle is fixedly led out through the lead-out hole, and after reserving an appropriate length, it is packaged into the multi-core pigtail adapter female head to form a multi-channel integrated optoelectronic conversion transceiver. The pigtails of the multi-channel module pigtail adapter are coiled in order in the pigtail compartment to form a pigtail bundle and then led out of the fiber coiling compartment, so that there are no multiple pigtails tangled in a disorderly manner on the printed board in the chassis. The pigtail bundle led out of the fiber coiling compartment is encapsulated in the multi-core pigtail adapter female head and can be inserted into the multi-core pigtail adapter seat on the chassis panel. The multi-core pigtail adapter seat is connected to the multi-core pigtail adapter male head outside the chassis, and more optical fiber interfaces are realized on the limited chassis panel, thereby achieving the purpose of reducing the coverage cost of the local equipment.

[0085] During implementation, in order to meet the demand for more users to be accessible on the user side, the multi-service multiplexer can be equipped with including but not limited to 4 to 8 first-level multiplexing / demultiplexing modules. Each first-level multiplexing / demultiplexing module can provide including but not limited to 24, 32, 48, 64, 96 user-side data interfaces including but not limited to Gigabit / 10 Gigabit (optional) rates, and is converted into optical interfaces through including but not limited to 12, 24-channel multi-channel integrated optoelectronic conversion transceiver devices. After the pigtails of these multi-channel optical interfaces are adapted into multi-core pigtails, they are connected to the multi-core pigtail adapter equipped on the multiplexer panel. Each pigtail of the multi-core pigtail adapted by the multi-core pigtail adapter is connected to an exclusive optical fiber for each user in the access network, forming an exclusive optical fiber broadband access system based on Ethernet technology. Among them, the user side of the multi-service multiplexer can provide N multi-core fiber pigtail adapters, and the fiber pigtails adapted by each fiber pigtail adapter can include but are not limited to 12-core, 24-core, 32-core, and 48-core fiber pigtails, so that each multiplexer can achieve access to including but not limited to 192, 256, 384, 512, and 768 exclusive fiber optic users.

[0086] The above-mentioned multicast service unit can be composed of an independent multicast service interface and a multicast service relay forwarding module. After receiving the core network IPTV multicast service through an independent channel, the multicast service of the IPTV live content is directly forwarded to the multi-service multiplexer, which is the first-level multiplexing / demultiplexing unit that is closest to the user and has the least number of connected users, through the forwarding function of the multicast service relay forwarding module. The IPTV live content that the user wants to watch is forwarded to the user by utilizing the multicast-to-unicast mechanism and large household bandwidth of the first-level multiplexing / demultiplexing unit, thereby fundamentally solving the problem that 30% of the protection bandwidth must be reserved when communication services, broadband Internet services and IPTV multicast services are transmitted through the same transmission link, and high-definition, ultra-high-definition 4K / 8K, AR / VR video services can be transmitted to end users at broadcast-level standard bit rates without deep compression.

[0087] The core idea of ​​this implementation method is: the common problem existing in the various technical access networks of communication operators at present is that in the transmission of radio and television services, in order to realize that broadcast services, communication services, and broadband Internet services share the same transmission channel resources, the transmission of broadcast services uses IPTV (Internet Protocol Television System) technology. In particular, in the transmission of cable TV live broadcast services, neither broadcast transmission nor unicast transmission can be used. It can only be transmitted using interactive multicast technology. As a result, more multicast replication points are built in the core network to reduce the pressure of live broadcast services on the access network, resulting in increased investment costs for core network equipment; second, multicast service protection bandwidth must be reserved in the transmission link, increasing the investment cost of network bandwidth; third, because the access of large-bitrate video services cannot be transmitted on the limited household bandwidth, the video services are deeply compressed, making it impossible to achieve broadcast-level transmission quality and meet the broadcast-level standard transmission of 4K / 8K ultra-high-definition programs.

[0088] In order to solve the above problems, a solution that the core network and access network work together can be adopted. The specific implementation ideas are:

[0089] First, a dedicated channel is used in the core network to transmit all the live broadcast services of the IPTV platform in a relay manner, so as to solve the problems of delay and packet loss caused by multicast replication points and switching routing equipment to multicast services, and improve the transmission quality of live broadcast services in the core network;

[0090] Second, on the service side of the access network central office equipment, an independent multicast service access interface is set up, so that the communication service, broadband Internet service and multicast service are connected to the access network central office equipment through their own independent interfaces. This solves the problem that when the communication service, broadband Internet service and multicast service are accessed through the same link, 30% of the protection bandwidth is reserved for the multicast service in the transmission link, resulting in only 70% system efficiency. This makes the communication service and broadband Internet service link efficiency reach 100%;

[0091] Third, in the local equipment, while the multiplexing, cross-connection and transmission units for communication services and broadband Internet services are independently set up, a multicast service processing unit is also independently set up. After receiving all live services transmitted by the core network through independent channels through its independent interface, the multicast service processing unit's multicast-to-unicast mechanism and each user's exclusive interface are used to obtain the advantages of large access bandwidth, and the live services that users want to watch and listen to are forwarded to end users, thereby achieving high-quality access to communication services, broadband Internet services and multicast services, and making the transmission quality of IPTV live services reach broadcast-level transmission standards.

[0092] According to the above ideas, we can get a Figure 5 Model shown. Figure 5 In the figure, the left part is a model diagram of the current IPTV service transmission in the core network, convergence layer and access layer in multicast replication mode. From the left model, we can see that the IPTV live broadcast service adopts interactive multicast transmission to share the transmission channel with communication services, broadband Internet services and data services. Routing, switching and multicast service replication are carried out between the backbone network transmission layer and the metropolitan area network transmission layer, and between the metropolitan area network transmission layer and the convergence layer transmission network. The convergence layer transmission network and the access layer with multicast replication function realize access network multiplexing, cross connection and transmission functions.

[0093] Attached Figure 5 The right part of the figure is the model proposed based on the above exploration. We can see from the right model that all IPTV live broadcast services, whether in the backbone layer, metropolitan area network, aggregation layer or access layer, are transmitted in a multicast relay manner, as shown in the attached figure. Figure 5 In the dotted line part, no matter the backbone layer, metropolitan area network, aggregation layer or access layer, it does not go through the switching routing system, nor does it set up multicast replication points. Instead, it uses the multicast relay mode with low price and higher transmission quality to transmit all IPTV live broadcast services to the access layer, and accesses them to the primary multiplexing unit which is closest to the user and has the least number of access users through an independent multicast service interface, and then accesses them to the end user through the multicast to unicast technology, thus completely solving the problem of attached Figure 5 The multicast replication transmission of IPTV live broadcast services in the left model brings many problems, such as the huge investment problem of adding multicast replication points, the delay and packet loss caused by multicast services passing through multiple layers of multicast replication and switching routing systems, and the inability to meet the high-quality transmission of HD and ultra-HD 4K / 8K live broadcast services.

[0094] The access network diagram constructed according to the above ideas is as follows Figure 6 shown. Figure 6 The Ethernet-based all-optical broadband access network with exclusive fiber-optic multi-service multiplexing is shown. Figure 1Compared with the PON network shown in the figure, its central office equipment is a multi-service multiplexer based on Ethernet technology provided in this example.

[0095] The service side of the above-mentioned multi-service multiplexer can provide multiple data service optical fiber interfaces with rates including but not limited to 10G bps, 25G bps or 100G bps and independent high-speed multicast service interfaces including but not limited to 10G bps or 25G bps. The service interface line supports IEEE802.3 10GBase-R or higher-speed optical fiber Ethernet standards and can be connected to the BRAS broadband access server of the metropolitan area network. The user side can provide including but not limited to 192, 256, 384, 512, 768 optical interfaces with Gigabit / 10 Gigabit rates. The device supports functions such as user upstream data aggregation and downstream data allocation, dynamic bandwidth allocation (DBA), bandwidth control strategy execution, port address binding, multicast message replication, QoS priority forwarding, MAC address modification and replacement.

[0096] This multi-service multiplexer is different from a general switch and does not need to have the message exchange and routing functions between any interfaces of a general switch. The multiplexing modules of the first- and second-level multiplexing / demultiplexing units of the multiplexer can use FPGA chips or dedicated chips with access network function definitions to have strong uplink data aggregation capabilities and downlink data distribution capabilities, thereby meeting the access network's multi-service multiplexing, cross-connection and transmission functions without the need to include switching and routing functions, and completely realizing transparent transmission of services and signaling.

[0097] In order to reduce the coverage cost of the access network, the multiplexer needs to meet the needs of the access network with a wide range of services and low traffic density, and also needs to have the requirements of high-density user interfaces. The chip used in the first-level multiplexing / demultiplexing module of the multiplexer adopts an FPGA chip or a dedicated chip that defines the access network function. It must not only meet the access network function definition, but also meet the characteristics of the high-density user interface of the access network local equipment. The chip used in the first-level multiplexing / demultiplexing module of the multiplexer can meet, including but not limited to 48, 96 user-side functional interfaces including but not limited to gigabit / 10 gigabit rates, and the interface density is much higher than that of general switch chips. At the same time, in order to achieve exclusive fiber-optic broadband access based on Ethernet technology, the optical interface on the user side of the device is different from the single-body plug-in optical module used in general switches. Instead, it adopts a multi-channel integrated optoelectronic conversion transceiver and a multi-core fiber pigtail adapter component, so that its interface density can be much higher than that of a dedicated chip of a general switch chip. Through the organic combination of multi-channel integrated optoelectronic conversion transceiver components and multi-core fiber optic adapters, the number of exclusive fiber optic users that can be accessed on the user side of a single device includes but is not limited to 192, 256, 384, 512, and 768 users, and the optical port density can be much greater than that of a general switch, thereby meeting the requirements of high-density access capabilities of the access network and reducing the coverage cost of the access network.

[0098] The multi-service multiplexer needs to meet the definitions of the access network service node interface (SNI), user network interface (UNI) and manageable interface (Q3), and has the requirements of the access network user port function, service port function, core function, transmission function, and access network management function between the access network service node interface (SNI) and the user network interface (UNI). This is different from the existing PON network:

[0099] 1) The user-side interface of the PON network central office equipment OLT does not have the user-side functional node UNI port function in the access network interface definition. The transmission mode of PON network downstream data is to modulate the downstream data of multiple users to the same downstream wavelength and then transmit it in a point-to-surface broadcast mode. N users share a core optical fiber under a PON port and access a PON port through a 1 / N optical split mode to receive their own data. In the transmission of upstream data, in order to make the upstream data also share a physical channel with the downstream data, the upstream data of multiple users is modulated to the same upstream wavelength in a time-division multiplexing mode and then transmitted to the same PON port corresponding to the downstream data. The network shape is a tree structure. Since the PON network uses time-division multiplexing technology to realize the transmission of upstream data under the tree structure, the access network user-side network interface (UNI) is at the exit end of the home gateway ONU, so the user's home must be equipped with a terminal gateway ONU to access the user's CPN network. In this example, the multi-service multiplexer of the exclusive fiber-optic broadband access system based on Ethernet technology adopts a sparse network structure based on Ethernet point-to-point. The access network user network interface (UNI) is at the multiplexer outlet. Therefore, there is no need to equip the user's home with a terminal gateway, which not only makes the asset interface between operators and users clear, but also greatly reduces the access network's home access cost.

[0100] 2) Although the bandwidth of each PON port of the OLT is very large, after being distributed through the tree structure with a splitting ratio of N, the actual average bandwidth allocated to each user is 1 / N of the PON port bandwidth. Moreover, although the average bandwidth allocated to each ONU is 1 / N of the PON port bandwidth, the physical interface rate of the ONU is the same as the PON port rate on the user side of the OLT, resulting in high access costs. For example, in the XG-PON network, the PON port rate is 10GE, and the optical port rate of the home ONU is also 10GE, but when splitting at 64, the actual average bandwidth obtained by the user is 10GE / 64=156Mbps. In this example, the multi-service multiplexer based on the Ethernet technology exclusive optical fiber broadband access system adopts a sparse network structure based on Ethernet point-to-point. Users access the gigabit rate interface in the multi-service multiplexer with an exclusive optical fiber structure, so that each user is allocated at least a gigabit rate access bandwidth.

[0101] 3) In the PON network, under the tree structure of shared optical fiber and time division multiplexing transmission mechanism, the user's home must be equipped with an access network gateway ONU. Therefore, the PON network access cost is high, and the interface rate of the ONU and the central office OLT must be completely corresponding. Therefore, when the local equipment is upgraded, the user-side gateway must be replaced, which requires an increase in the upgrade cost. For example, when upgrading from GPON network to XG-PON, when the central office is upgraded to XG-PON OLT, the ONU in the user's home must also be upgraded to XG-PON ONU. The multi-service multiplexer of the exclusive optical fiber broadband access system based on Ethernet technology provided in this example adopts a sparse network structure based on Ethernet point-to-point. The upgrade of the central office equipment has nothing to do with the user-side CPN network.

[0102] Considering that in the transmission of radio and television services, in order to share the same transmission channel resources with broadcast services, communication services, and broadband Internet services, communication operators use IPTV (Internet Protocol Television System) technology for the transmission of radio and television services, especially in the transmission of live broadcast services, which are also transmitted according to interactive multicast technology. In this way, on the one hand, in order to reduce the pressure of multicast services on the core network and access network, more multicast replication points are built in the core network, resulting in an increase in the investment cost of core network equipment; on the other hand, multicast service protection bandwidth must be reserved in the transmission link, increasing the investment cost of network bandwidth; furthermore, in order to transmit large-grained long-connection video services on limited household bandwidth, the video service is deeply compressed, which makes it impossible to achieve broadcast-level transmission quality and meet the broadcast-level standard transmission of 4K / 8K ultra-high-definition programs. Even if the video bit rate is greatly compressed and the multicast replication transmission technology is used, these services still occupy a large amount of core network and access network bandwidth resources in the transmission network. At least 30% of the protection bandwidth needs to be reserved in the transmission link. If the traffic bandwidth of the live program itself is added, the live broadcast service will consume more than 40% of the network bandwidth of the total resources of the transmission system. This is a huge consumption of network resources, which is also the fundamental reason why PON networks are constantly upgraded and expanded. In order to save as much resource consumption as possible, IPTV technology must first increase the investment in core network replication points, and secondly, compress the video bit rate of broadcast and television services as much as possible, which results in the transmission program quality not meeting the broadcast-level transmission quality, especially the transmission of 4K and 8K ultra-high-definition programs in the future, which is more difficult to achieve.

[0103] Based on this, in this example, a multi-service multiplexer is provided, which independently sets a multicast service interface and a multicast service relay forwarding function module. After receiving the core network IPTV multicast service through an independent channel, the multicast service of the IPTV live content is directly forwarded to the first-level multiplexing / demultiplexing unit of the multi-service multiplexer which is closest to the user and has the least number of connected users through the forwarding function of the multicast service relay forwarding module. The IPTV live content that the user wants to watch is forwarded to the user by utilizing the multicast-to-unicast mechanism and large household bandwidth of the first-level multiplexing / demultiplexing unit, thereby fundamentally solving the problem that 30% protection bandwidth must be reserved when communication services, broadband Internet services and IPTV multicast services are transmitted through the same transmission link, and high-definition, ultra-high-definition 4K / 8K, AR / VR video services can be transmitted to end users at a broadcast-level standard bit rate without deep compression.

[0104] That is, in this case, it is equivalent to moving the multicast replication point of the IPTV multicast service that occupies the largest bandwidth down to the first-level multiplexing / demultiplexing unit with the least number of end users in the access network. Therefore, the core network can use the lowest-cost relay mode to transmit IPTV multicast services, thereby saving the investment cost of core network multicast replication points and reserved protection bandwidth. At the same time, after adopting independent channel relay transmission measures for IPTV multicast services in the core network, the delay, packet loss rate and bit error rate indicators of video services can reach the broadcast-level transmission standards. Furthermore, the IPTV multicast service does not have access to the data service interface of the secondary multiplexing / demultiplexing unit of the multi-service multiplexer, so in the access network communication service and broadband Internet service link, there is no need to reserve 30% of protection bandwidth resources for the IPTV multicast service. For communication services and broadband Internet services, the link resource utilization rate of the core network and access network can be increased to 100%;

[0105] Furthermore, on the user side of the multi-service multiplexer, an exclusive optical fiber interface is provided to each user, and access bandwidth including but not limited to gigabit / 10Gbit speeds is provided. If the primary multiplexing / demultiplexing unit of the multi-service multiplexer can provide each user with an average of 200M communication services and broadband Internet data service processing capabilities, when the concurrency rate is 50%, the average dynamic bandwidth for communication services and broadband Internet data services can reach 400M, and these concurrent users still have 600M multicast service access bandwidth. That is, when the multi-service multiplexer provides an average of 400M communication services and broadband Internet data service bandwidth to 100% of users, each user still has 600M multicast service access bandwidth, ensuring that the transmission quality of high-definition, ultra-high-definition 4K / 8K, and AR / VR video services in IPTV multicast services can fully meet the broadcast-level transmission standards, thereby solving the problem that the existing communication operation network deeply compresses the live service content in IPTV multicast services and cannot provide high-quality video services.

[0106] Specifically, in this example, a multi-service multiplexer of an exclusive optical fiber broadband access system based on Ethernet technology is provided. The multi-service multiplexer is used at the local end of an exclusive optical fiber multi-service multiplexing all-optical network broadband access network based on Ethernet technology, and forms an access network based on Ethernet technology exclusive optical fiber with an all-optical comb-shaped architecture ODN. Each user of the access network obtains multi-service access such as data service, broadband Internet, communication service, video service, etc. in a point-to-point access mode with an exclusive single-core optical fiber. Furthermore, the multi-service multiplexer can meet the characteristics of the access network with multiple types of services, low service density, high access density, low coverage cost and low home access cost. The multi-service multiplexer can realize access for 192, 256, 384, 512, and 768 exclusive optical fiber users, replaces the access method in which each PON port of the PON system shares one core of optical fiber and accesses multiple users through an optical splitter with the access method in which each user has an exclusive core of optical fiber, replaces the original tree-shaped network architecture with a comb-shaped network architecture, replaces the PON system's downstream data transmission in a broadcast manner and upstream data transmission mechanism using a time-division multiplexing technology with a unicast transmission mechanism, cancels the existing home gateway ONU in the PON network, and achieves the effect of replacing the expensive home gateway ONU and complex time-division multiplexing transmission technology with a low-cost optical fiber medium.

[0107] like Figure 3As shown, it is a principle block diagram of the multi-service multiplexer provided in this example, and the multi-service multiplexer is composed of a secondary multiplexing / demultiplexing unit 6, a multicast service relay forwarding unit 17, a main and standby power supply unit 13 and a primary multiplexing / demultiplexing unit 22. Among them, the secondary multiplexing / demultiplexing unit is composed of a service side core network data service interface, a secondary multiplexing / demultiplexing module, a network management module, a storage module, a main control CPU module, an I / O management CPU module and a high-speed data interface facing the primary multiplexing / demultiplexing unit; the multicast service unit is composed of a multicast service interface, a multicast service relay forwarding module and a high-speed data interface facing the primary multiplexing / demultiplexing unit; the main and standby power supply unit is composed of a main and standby power supply and a main and standby power supply management module; the primary multiplexing / demultiplexing unit is composed of a high-speed data interface facing the secondary multiplexing / demultiplexing unit and the multicast relay unit, a primary multiplexing / demultiplexing module, a user-side multi-channel integrated optoelectronic conversion transceiver and a multi-core pigtail adapter interface, etc. The multi-service multiplexer is a central office device of an exclusive optical fiber multi-service multiplexing all-optical network broadband access network based on Ethernet technology. Together with the ODN in which each household has its own optical fiber, it forms an exclusive optical fiber broadband access system based on Ethernet technology.

[0108] In order to meet the needs of more users on the user side, the multi-service multiplexer can be equipped with, including but not limited to, 4 to 8 first-level multiplexing / demultiplexing modules, each of which can provide, including but not limited to, 48, 96 channels, including but not limited to, gigabit / 10G user-side data interfaces, and can be converted into optical interfaces through, including but not limited to, 12, 24-channel multi-channel integrated optoelectronic conversion transceiver devices. After the pigtails of these multi-channel optical interfaces are adapted into multi-core pigtails, they are connected to the multi-core pigtail adapter equipped on the multiplexer panel. Each pigtail of the multi-core pigtail adapted by the multi-core pigtail adapter is connected to a single-core optical fiber for each user of the access network, forming an exclusive optical fiber broadband access system based on Ethernet technology. The user side of the multi-service multiplexer can provide N multi-core pigtail adapters, and the pigtails adapted by each pigtail adapter include but not limited to 12-core, 24-core, and 48-core pigtails, so that each multiplexer can achieve access to, including but not limited to, 192, 256, 384, 512, and 768 exclusive optical fiber users.

[0109] Compared with the OLT in the existing PON network, the multi-service multiplexer provided in this example performs two multiplexing and demultiplexing operations for each service, i.e., multiplexing and demultiplexing on the service side of the core network, and time division multiplexing and demultiplexing on the access network side corresponding to each ONU at the PON port. However, the multi-service multiplexer in this example only needs to perform multiplexing and demultiplexing on the service side of the core network, and does not perform packet multiplexing and demultiplexing on the user side of the access network.

[0110] The above multi-service multiplexer can realize the following functions:

[0111] 1) Data packet forwarding function: link aggregation and flow control technology are used in data packet forwarding to realize data packet multiplexing and demultiplexing, data packet aggregation and distribution;

[0112] 2) MAC address management and VLAN management. MAC address broadcast is only directional broadcast, and VLAN is only directional VLAN, which can effectively improve the efficiency of the whole machine and prevent broadcast storms;

[0113] 3) Unlike Ethernet switches, there is no data packet exchange between ports, so there is no need for the ports to be connected to each other, only directional forwarding of data packets is performed;

[0114] 4) The uplink direction of the multi-service multiplexer is from the end user side to the metropolitan area network server side, and the downlink direction is from the metropolitan area network server side to the end user side. The uplink direction mainly realizes data aggregation, and the downlink direction mainly realizes data service distribution. Therefore, the service side of the secondary multiplexing and demultiplexing module of the multiplexer provides the access network service side node function. On the user side, the primary multiplexing and demultiplexing module provides each user with an exclusive port with access network node function. Each port is connected to only one user-side CPN network, and the access network user-side data is aggregated and forwarded to the metropolitan area network aggregation layer, and the core network data is distributed to the user-side CPN network.

[0115] 5) Since bandwidth access to the network is often paid for, the access bandwidth of subscribers is required to be highly controllable. Therefore, the device has powerful bandwidth management capabilities, including a variety of configurable bandwidth allocation strategies and dynamic bandwidth allocation mechanisms;

[0116] 6) Supports the carrying of various complex services, has QoS priority forwarding capabilities, supports efficient addressing and high-speed forwarding, and has the ability to modify and replace the MAC address of the message in real time;

[0117] 7) The secondary multiplexing and demultiplexing modules and the primary multiplexing and demultiplexing modules mainly use FPGA chips or dedicated ASIC chips to realize data processing functions.

[0118] The multi-service multiplexer in this example is different from a general switch and is not required to have the message exchange and routing functions between any interfaces that a general switch has. The multiplexing / demultiplexing modules of the first- and second-level multiplexing / demultiplexing units of the multi-service multiplexer use FPGA chips or dedicated chips that define the access network functions. They must have powerful uplink data aggregation capabilities and downlink data distribution capabilities to meet the access network's multi-service multiplexing, cross-connection and transmission functions. They do not contain switching and routing functions and can achieve completely transparent transmission of services and signaling.

[0119] In order to reduce the access network coverage cost, the multi-service multiplexer needs to meet the requirements of a wide range of access network services, low traffic density, but high-density user interfaces. The chips used in the first-level multiplexing / demultiplexing module of the multiplexer use FPGA chips or dedicated chips that define the access network functions. They must not only meet the access network interface definition and function definition, but also meet the characteristics of high-density user interfaces of the access network central office equipment. The chips used in the first-level multiplexing / demultiplexing module of the multi-service multiplexer must meet the requirements of 24, 32, 48, 64, 96 user-side functional interfaces including but not limited to Gigabit / 10 Gigabit rates, and the interface density is much higher than that of general-purpose switch chips. At the same time, in order to achieve exclusive fiber-optic broadband access based on Ethernet technology, the optical interface on the user side of the device is different from the single-body plug-in optical module used in general switches. Instead, it is matched with a dedicated chip with an interface density far higher than that of a general switch chip through a multi-channel integrated optoelectronic conversion transceiver and a multi-core fiber pigtail adapter assembly. Through the organic combination of multi-channel integrated optoelectronic conversion transceiver components and multi-core fiber optic adapters, the user side of a single device can access exclusive fiber-optic users including but not limited to 192, 256, 384, 512, and 768 users, and the optical port density is far greater than that of a general switch, thereby meeting the high-density access capability of the access network and reducing the coverage cost of the access network.

[0120] Furthermore, in this example, the fiber-to-the-home access network based on Ethernet technology with a multi-service multiplexer as the central office device has a point-to-point comb network architecture, and each user uses a dedicated optical fiber to access the user-side interface of the multi-service multiplexer at the central office of the access network. That is, the fiber-to-the-home access network based on Ethernet technology with a multi-service multiplexer as the central office device mainly consists of two parts: the multi-service multiplexer of the central office device and the comb-structured ODN.

[0121] The exclusive fiber-to-the-home access network based on Ethernet technology with a multi-service multiplexer as the central office equipment is different from the PON network. It does not require a time-division multiplexing mechanism, and the user end does not need to be equipped with an access gateway ONU device. It is equivalent to replacing the home gateway ONU device in the PON network with a passive optical fiber medium. It not only solves the problem of unclear assets when the operator's assets are placed in the user's home, but also reduces the cost of access to the home. The upgrade of the access network central office has nothing to do with the user side, which solves the problem that the user end also needs to replace the gateway device when the system is upgraded, thereby greatly reducing the cost of access to the home and the secondary investment cost caused by continuous upgrades. The exclusive fiber-optic broadband access network based on Ethernet technology is different from the PON network. It does not require a time-division multiplexing mechanism, and the user end does not need to be equipped with an access gateway ONU device. It is equivalent to replacing the home gateway ONU device in the PON network with a passive optical fiber medium. It not only solves the problem of unclear assets when the operator's assets are placed in the user's home, but also greatly reduces the cost of access to the home. The upgrade of the access network central office has nothing to do with the user side, which solves the problem that the user end also needs to replace the gateway when the system is upgraded, thereby greatly reducing the cost of access to the home and the secondary investment cost caused by continuous upgrades.

[0122] The Ethernet-based exclusive fiber-to-the-home access network with a multi-service multiplexer as the central office can provide a larger access bandwidth. The current PON network accesses multiple users in a split-optical manner under one PON interface, that is, a 10GPON network. The average access bandwidth actually allocated to users under each PON port is only tens of megabits to hundreds of megabits. The multi-service multiplexer provided in this example can provide each user with, but not limited to, a gigabit / 10-gigabit optical interface, achieving true broadband access.

[0123] Furthermore, in order to share the same transmission channel resources with broadcasting services, communication services and broadband Internet services, current communication operators use IPTV (Internet Protocol Television) technology for the transmission of radio and television services. In particular, the transmission of live broadcasting and television services is also based on interactive multicast technology. Figure 5As shown in the figure, communication services, broadband Internet services and IPTV multicast services are all transmitted through the same link and connected to the access network. The reason for this treatment is, on the one hand, to reduce the pressure of multicast services on the core network and access network, and to build more multicast replication points in the core network, which results in an increase in the investment cost of core network equipment; on the other hand, 30% of the multicast service protection bandwidth must be reserved in the transmission link, which increases the investment cost of network bandwidth; on the other hand, in order to transmit large-granular long-connection video services on limited household bandwidth, the video services are deeply compressed, which cannot meet the broadcast-level standard transmission of 4K / 8K ultra-high-definition programs. Even if the video bit rate is greatly compressed and the multicast replication transmission technology is adopted, these services still occupy a large amount of core network and access network bandwidth resources in the transmission network. At least 30% of the protection bandwidth must be reserved in the transmission link. If the traffic bandwidth of the live program itself is added, the live broadcast service will consume more than 40% of the network bandwidth of the total resources of the transmission system. This is a huge consumption of network resources, which is also the fundamental reason for the continuous upgrading and expansion of PON networks. In order to save as much resources as possible, IPTV technology needs to increase investment in core network replication points and compress the video bit rate of radio and television services as much as possible, which will result in the quality of transmitted programs failing to meet broadcast-level transmission quality, especially the transmission of 4K and 8K ultra-high-definition programs in the future, which will be more difficult.

[0124] To solve this problem, in this example, a multi-service multiplexer is proposed to use different service side interfaces to access communication services, broadband Internet services and IPTV multicast services, such as Figure 6 As shown, Figure 6 The multi-service multiplexer is independently equipped with a multicast service interface and a multicast service relay forwarding function module. Its main purpose is to receive the core network IPTV multicast service through an independent channel, and then forward the multicast service of the IPTV live content directly to the user closest to the multi-service multiplexer through the relay forwarding function of the multicast service relay forwarding module, and access the first-level multiplexing / demultiplexing module with the least number of users, and use the multicast to unicast mechanism of the first-level multiplexing / demultiplexing module and the large home bandwidth to forward the IPTV live content that the user wants to watch to the end user.

[0125] like Figure 6 As shown, the service side interface 3 is the communication service, data service, and broadband Internet service access interface of the multi-service multiplexer, and the service side interface 1 is the access interface of the IPTV multicast service of the multi-service multiplexer. After the multi-service multiplexer uses an independent interface to access the IPTV multicast service, the bandwidth utilization rate of the communication service, data service, and broadband Internet service link is increased to 100%. At the same time, the IPTV multicast service does not need to adopt the deep compression standard bit rate for high-definition, ultra-high-definition 4K / 8K, and AR / VR video services, and is transmitted to end users at a broadcast-level standard bit rate.

[0126] like Figure 6 The method of accessing the IPTV multicast service through the independent interface of the multi-service multiplexer shown can achieve the following technical effects:

[0127] 1) It is equivalent to moving the multicast replication point of the IPTV multicast service that occupies the largest bandwidth down to the first-level multiplexing / demultiplexing unit with the least number of end users in the access network. Therefore, the core network can adopt the lowest-cost relay mode to transmit IPTV multicast services, which can save the investment cost of core network multicast replication points and reserved protection bandwidth. At the same time, after adopting independent channel relay transmission measures for IPTV multicast services in the core network, the delay, packet loss rate and bit error rate indicators of video services can reach the broadcast-level transmission standards;

[0128] 2) IPTV multicast services are not connected to the data service interface of the secondary multiplexing / demultiplexing unit of the multi-service multiplexer, so there is no need to reserve 30% of protection bandwidth resources for IPTV multicast services in the access network communication services and broadband Internet service links. For communication services and broadband Internet services, the resource utilization rate of the core network and access network links can be increased to 100%;

[0129] 3) On the user side of the multi-service multiplexer, an exclusive optical fiber interface is provided to each user, and access bandwidth including but not limited to Gigabit / 10 Gigabit rates is provided. If the primary multiplexing / demultiplexing unit of the multi-service multiplexer can provide each user with an average of 200 megabits of communication services and broadband Internet data service processing capabilities, when the concurrency rate is 50%, the average dynamic bandwidth per user for communication services and broadband Internet data services can reach 400 megabits, and these concurrent users still have 600 megabits of multicast service access bandwidth. In other words, when the multi-service multiplexer provides an average of 400 megabits of communication services and broadband Internet data service bandwidth to 100% of users, each user still has 600 megabits of multicast service access bandwidth, ensuring that the transmission quality of high-definition, ultra-high-definition 4K / 8K, and AR / VR video services in IPTV multicast services can fully meet the broadcast-level transmission standards, thereby solving the problem that the existing communication operation network cannot provide high-quality video services due to deep compression of live service content in IPTV multicast services.

[0130] That is, PON technology has developed from APON to BPON, EPON and GPON since the 1990s. Its widespread application started from EPON and GPON. EPON adopts a symmetrical transmission bandwidth mode for upstream and downstream, with rates of 1.25Gbps / 1.25Gbps respectively. When the optical fiber is split by 64 times, the average bandwidth per household is about 20M Gbps. GPON adopts an asymmetric mode of 2.5Gbps downstream / 1.25Gbps upstream. When the optical fiber is split by 64 times, the average bandwidth per household is about 40M Gbps / 20M Gbps. In order to further increase the average bandwidth allocated per household under the optical splitter, the existing PON technology has begun to enter the 10GEPON and XG-PON era. At present, the relatively low cost is XG-PON, which adopts a transmission rate of 10Gbps downstream and 2.5Gbps upstream. When the optical fiber is split by 64 times, the average bandwidth per household is about 160M Gbps / 20MGbps. However, at present, the equipment cost of XG-PON is much higher than that of GPON, and it has not been widely used.

[0131] When GPON is upgraded to XG-PON, under the same 64-split conditions, the average downstream bandwidth ratio of the two is 40Mbps:160Mbps, and the cost is 211 yuan / household:422 yuan / household, that is to say: when the average cost per household doubles, the average downstream bandwidth per household increases by 4 times. However, when it comes to the future 25GPON, the average downstream bandwidth per household is 25G / 64 households = 390Mbps, but the cost may not just double. In other words, in the upgrade of PON technology, the cost will increase, but the increase in average bandwidth per household will decrease.

[0132] Through the multi-service multiplexer provided in this example, the household bandwidth includes but is not limited to 1G / 10G, but the cost will be the same as the current XG-PON cost, or lower than the XG-PON cost, but the average household bandwidth of the XG-PON system is only 156 Mbps. That is, the multi-service multiplexer provided in this example can meet the demand for low-cost large access bandwidth, and is comparable to the future 25GPON, 50GPON, 100Gpon, and even NGPON and TWDM-PON, but the cost is only the current XG-PON system cost, that is, it has a high cost-effectiveness, and completely solves the cost problem of repeated investment caused by the continuous upgrading of PON technology.

[0133] Furthermore, because multiple users share one PON port resource under the time division multiplexing technology in the PON network, in order to provide users with higher access bandwidth, each PON port and home gateway requires high-speed chip support. When increasing the home bandwidth, higher-speed chips will be added to the access network equipment to increase the home bandwidth, which will increase the price of equipment raw materials and processing costs, and at the same time consume more production energy and operating energy. The multi-service multiplexer provided in this example can provide higher access bandwidth at the low-speed chip level, greatly reducing the price of equipment raw materials and processing costs, while also saving production energy and operating energy. It uses Ethernet architecture and protocols, has strong compatibility, does not have complex time division multiplexing and wavelength division multiplexing technologies, has transparent transmission, stable operation, and low maintenance costs.

[0134] Furthermore, the access network not only meets the needs of the communication operator network, but also meets the needs of the cable TV network. The unique access network central office multicast service relay forwarding function can not only completely solve the problems of low transmission quality and low transmission link efficiency of the operator's IPTV service, but can also be applied to the cable TV network. For the multi-service multiplexer, first, the user access bandwidth is large, and each user has exclusive optical fiber and high-speed physical bandwidth; second, there is no home gateway, which is energy-saving and environmentally friendly, and the upgrade of the access network has nothing to do with the user; third, the average cost per household is low, there is no cost of the home gateway, and the home cost is only the coverage cost of the central office equipment and passive optical fiber.

[0135] In the implementation plan of the multi-service multiplexer, in order to reduce the coverage cost and improve the transmission efficiency, we have taken measures to increase the interface density and reduce the coverage cost by using multiple integrated optoelectronic conversion interfaces; we have also taken measures to further improve the interface density by setting M first-level service units for each multiplexer, and each first-level service unit provides m user interfaces to obtain M*m; multicast service relay forwarding measures will also improve system efficiency and reduce system costs. The purpose of the above measures is to reduce the overall cost of multi-service multiplexers in network construction, improve its cost performance, and provide operators with better investment benefits. At the same time, we also proposed models that adapt to different environments, such as integrated models, plug-in models and mother-child models, the purpose of which is to further reduce the initial investment cost of network construction. For example, the plug-in model can gradually increase the number of plug-ins according to the number of households, thereby reducing the coverage cost in the initial stage of network construction; for the mother-child model, the sub-machine configuration can also be increased according to the number of households to reduce the coverage cost. At the same time, the sub-machine can expand the coverage radius of the access network and reduce the ODN investment cost.

[0136] The following describes the core modules, function definitions, interface definitions, and interface definitions of each unit of the multi-service multiplexer as well as different models.

[0137] The multi-service multiplexer is mainly composed of a secondary multiplexing unit, a primary and standby power supply unit, a multicast service unit and a primary multiplexing unit.

[0138] The composition, function definition and interface definition implementation scheme of the secondary multiplexing / demultiplexing unit core module in the multi-service multiplexer can be as follows: Figure 7 As shown:

[0139] The core module of the secondary multiplexing / demultiplexing unit is composed of RISC-V (MCU) chip + network processing chip + storage chip + interface chip, network management module, power supply module, related circuits and related interfaces. The chip used can be an FPGA chip or an ASIC dedicated chip.

[0140] The core module functions of the secondary multiplexing and demultiplexing unit are defined as:

[0141] Message queues, dynamic bandwidth allocation, storage control, scheduling management, link aggregation, flow control, MAC address management and VLAN management, message aggregation and distribution.

[0142] The core module interface of the secondary multiplexing and demultiplexing unit is defined as: providing data link layer MAC control sublayer and MAC address, MII interface, physical layer PHY interface and Serdes interface, PCie interface, USB interface, and providing serial interfaces such as SPI, GPIO, I2C and JTAG, as well as parallel interfaces between chips. The service side provides 10G / 25G / 100G serdes data service interface. The user side provides 8*10 / 25G serdes interface and 8*10G / 25GPCie serial interface that can access multiple primary multiplexing units, so as to access primary multiplexing and demultiplexing units of different models. Provide 1000Mphy network management interface, USB3.0 interface and serial management interfaces such as SPI, GPIO, I2C and JTAG and parallel interfaces between chips. Provide power interface. Provide management interface for other units.

[0143] The core module of the main and standby power supply unit of the multi-service multiplexer can be composed of a main and standby power supply module, a power management module, a main and standby power supply switching module and related interfaces, wherein the core module of the main and standby power supply unit can be as follows Figure 8 shown.

[0144] The main and standby power modules are composed of an AC power protection module, a rectifier module, a switching power module, and a DC power output protection module. The main and standby switching modules provide hot-swap support to ensure safe power supply for the entire machine. The power management module provides monitoring and management functions for the main and standby power modules, and provides a management interface to ensure monitoring and management of the power supply of the entire machine.

[0145] The core module of the multicast service relay forwarding unit in the multi-service multiplexer is the relay forwarding module. The composition, function definition and interface definition of the core module can be as follows: Fig. 9 As shown, the specific implementation scheme is:

[0146] Core components of multicast service relay unit:

[0147] The core module of the multicast service relay forwarding unit is mainly composed of RISC-V (MCU) chip + relay processing chip + storage chip + interface chip, power supply module, related circuits and related interfaces. The chip used can be FPGA or dedicated ASIC chip.

[0148] Functional definition of the core module of the multicast service relay unit: shaping and forwarding multicast service data streams.

[0149] Interface definition of the core module of the multicast service relay unit: The relay unit provides the data link layer MAC control sublayer and MAC address, MII interface, physical layer PHY interface and Serdes interface, PCie interface, USB interface, and provides serial interfaces such as SPI, GPIO, I2C and JTAG, as well as parallel interfaces between chips. The service side provides 10G / 25Gserdes broadcast service or multicast service interface. The user side provides 8*10 / 25G serdes interface and 8*10G / 25GPCie serial interface that can access multiple first-level multiplexing units, so as to access the corresponding first-level multiplexing and demultiplexing modules. Provide serial interfaces such as SPI, GPIO, I2C and JTAG and parallel interfaces between chips. Provide power interface. Provide management interface.

[0150] The core modules, functions and interface definition implementation plans of the first-level multiplexing unit can be as follows: Fig.10 As shown, the specific implementation scheme is:

[0151] The core modules of the first-level multiplexing unit are composed of:

[0152] The core module of the primary multiplexing unit is mainly composed of RISC-V (MCU) chip + network processing chip + storage chip + interface chip, network management module, power supply module, related circuits and related interfaces. The chip used can be an FPGA chip or a dedicated ASIC chip.

[0153] Functional definition of the core module of the first-level multiplexing unit:

[0154] Message queues, dynamic bandwidth allocation, storage control, scheduling management, link aggregation, flow control, MAC address management and VLAN management, message aggregation and distribution.

[0155] The interface definition of the core module of the first-level multiplexing unit is:

[0156] The first-level multiplexing unit provides the data link layer MAC control sublayer and MAC address, MII interface, physical layer PHY interface and Serdes interface, PCie interface, USB3.0 interface, and also provides serial interfaces such as SPI, GPIO, I2C and JTAG, as well as parallel interfaces between chips. The service side provides 2*10G / 25G serdes+2*10G / 25G PCie broadcast or multicast service interfaces and 2*10G / 25G serdes+2*10G / 25G PCie data service interfaces, and 4*RGMII interfaces.

[0157] The user side can provide 96*1G / 10G serdes interfaces and multi-channel integrated photoelectric conversion; the transceiver module forms a high-density user interface, so that each first-level multiplexing unit can access 96 exclusive fiber users. Provide 1000Mphy, USB3.0 and SPI, GPIO, I2C and JTAG serial management interfaces and parallel interfaces between chips. Provide power interface. Provide management interface.

[0158] In order to meet the needs of different network paths and various network architectures, and to reduce the coverage cost and home access cost of access networks built by multi-service multiplexers, multi-service multiplexers can be configured with multiple primary multiplexing / demultiplexing modules including but not limited to 24, 32, 48, 64, and 96 user interfaces, so that the user-side optical ports of each multiplexer can have different specifications such as 192, 256, 384, 512, and 768. In the implementation plan, in order to solve the problem of high-density optical ports and multi-user access, the following methods can be used:

[0159] 1) The first-level multiplexing / demultiplexing module meets the characteristics of the access network with many types of services, low service density, but high access density. The user side of each first-level multiplexing / demultiplexing module can provide, including but not limited to, 24, 32, 48, 64, and 96 user interfaces;

[0160] 2) In order to ensure higher access bandwidth for users, the user-side interface rate of the first-level multiplexing / demultiplexing module includes but is not limited to 1 Gigabit / 10 Gigabit (optional) rate;

[0161] 3) The user-side interface of each module adopts a multi-channel integrated optoelectronic conversion transceiver component including but not limited to a Gigabit / 10 Gigabit rate. The number of channels of the multi-channel integrated optoelectronic conversion transceiver component includes but is not limited to 12, 24, 32, and 48 channels;

[0162] 4) The pigtails of the multi-channel integrated optoelectronic conversion transceiver assembly include but are not limited to 12, 24, 32, 48-core multi-core pigtails;

[0163] 5) The multiplexer panel is equipped with a multi-core fiber pigtail adapter that matches the multi-core fiber pigtails of the multi-channel integrated optoelectronic conversion transceiver components, so as to realize the configuration of the high-density user interface of the multi-service multiplexer on a limited chassis panel.

[0164] Based on this, in this example, various models such as an integrated machine mode, a plug-in board mode, and a mother-and-child machine mode are set for the above-mentioned multi-service multiplexer. Specifically, the different models are described as follows:

[0165] 1. Multi-service multiplexer for integrated models:

[0166] like Figure 3 The figure shows the principle block diagram of the integrated model. The integrated model is an implementation scheme that integrates the secondary multiplexing / demultiplexing unit, multicast service unit, main and standby power supply unit and primary multiplexing / demultiplexing unit of the multi-service multiplexer into one chassis, wherein the power supply part adopts the form of an independent board. Figure 3 As shown, the multi-service multiplexer is composed of a secondary multiplexing unit 6, a primary and standby power supply unit 13, a multicast service relay forwarding unit 17 and a primary multiplexing / demultiplexing unit 22.

[0167] Among them, the secondary multiplexing unit 6 is composed of a network management interface 2, a network management module 7, a storage module 8, a service side core network data service interface 3, a secondary multiplexing module 9, a main control CPU module 10, an I / O management CPU module 11 and a data service bus 12 facing the primary multiplexing unit; the multicast service relay forwarding unit 17 is composed of a multicast service interface 1 and a multicast service relay unit core module 18; the active / standby power supply unit 13 is mainly composed of active / standby power supply modules 14, 15 and an active / standby power supply management module 16.

[0168] Among them, the first-level multiplexing / demultiplexing unit 22 can be composed of a high-speed data service bus 12 facing the second-level multiplexing unit, a multicast service bus 21, a first-level multiplexing / demultiplexing unit core module 23, a user-side data interface 24, a multi-channel integrated optoelectronic conversion transceiver 25, a multi-core fiber pigtail 26 and a multi-core fiber pigtail adapter 27, a multi-core fiber pigtail adapter seat 28, etc.

[0169] The integrated multi-service multiplexer is relatively more integrated, has lower cost, fewer interfaces between devices, and is stable in operation. However, when the household penetration rate of the integrated multi-service multiplexer is not high, the coverage cost is difficult to control.

[0170] like Figure 3As shown, the integrated multi-service multiplexer is composed of a secondary multiplexing / demultiplexing unit 6, a multicast service relay forwarding unit 17, a primary / standby power supply unit 13, and a primary multiplexing / demultiplexing unit 22. That is, each unit core module is deployed on a circuit board in a chassis, and the internal bus and external physical interface between the functional units are configured to form each functional unit of the multiplexer, thereby forming an integrated model.

[0171] like Fig.11 As shown, it is a functional definition and interface definition principle block diagram of the secondary multiplexing / demultiplexing unit in the integrated model of the multi-service multiplexer, including: the network management interface 2 and data service interface 3 of the secondary multiplexing / demultiplexing unit, the power supply bus 19, and the management bus 20. The high-speed serial data service bus 12 of the primary multiplexing / demultiplexing unit is connected. According to the characteristics of the integrated model, in the integrated model, the secondary multiplexing / demultiplexing unit and the primary multiplexing / demultiplexing unit PCie high-speed data interface are connected through the data service bus 12. The core module of the secondary multiplexing / demultiplexing unit has 1 to 8 PCie interfaces, which can be connected to 1 to 8 primary multiplexing / demultiplexing units, and its rate includes but is not limited to 10G / 25G.

[0172] In order to ensure power supply, Fig.12 As shown, the main and standby power supply unit 13 can be provided with a main and standby power supply module and a main and standby power supply switching module that can support hot plugging. Among them, the main and standby power supply module can be composed of an AC protection module, a rectifier module, a switching power supply module, a DC protection module, a power management module and a main and standby power supply switching module. The main and standby power supply switching module can support hot plugging, and as long as one power supply is normal, the normal power supply of the equipment can be guaranteed. The power supply interface is used as the power supply bus interface of the integrated model through the power supply bus 19. In actual implementation, the main and standby power supply unit can adopt an independent plug-in board to supply power to each functional unit through the backplane interface. The main and standby power supply unit 13 can also be provided with a power management module, and its management interface monitors and manages the power supply unit through the management bus 20.

[0173] The implementation scheme of the multicast service relay forwarding unit in the integrated model can be as follows: Fig.13 As shown, the multicast service relay forwarding unit 17 of the integrated multi-service multiplexer model can be composed of a multicast service relay unit core module 18 and a physical layer interface and a bus interface adapted to the integrated model. The service side 10G / 25G Serdes interface 1 of the multicast service relay forwarding unit 17 is equipped with an SFP optical module to achieve access to the multicast service. The power interface and the management interface are respectively connected to the power module and the management module through the power bus 19 and the management bus 20 to achieve power supply and management of this unit.

[0174] In the integrated model, the user-side PCie serial interface of the multicast service relay unit core module 18 can access the first-level multiplexing / demultiplexing unit of the integrated model through the PCie multicast service bus 21 to realize the relay and forwarding of the multicast service.

[0175] The implementation scheme of the first-level multiplexing / demultiplexing unit of the integrated model can be as follows Fig.14 As shown, the first-level multiplexing / demultiplexing unit 22 of the integrated multi-service multiplexer model is composed of a first-level multiplexing / demultiplexing unit core module 23 and a physical layer interface and bus interface adapted to the integrated model. The service-side multicast service and data service of the first-level multiplexing / demultiplexing unit 22 are respectively connected to the multicast service bus 21 and the data service bus 12 through the 10G / 25GPCie serial interface to realize the access of multicast service and data service. The power supply interface and the management interface are respectively connected to the power supply module and the management module through the power supply bus 19 and the management bus 20 to realize the power supply and management of this unit.

[0176] like Fig.14 As shown, the user side of the primary multiplexing / demultiplexing unit can be equipped with a multi-channel integrated optoelectronic conversion transceiver module 25, which is connected to the user side data interface 24 of the 1G / 10G rate Serdes of Serdes1-Serdes96 of the primary multiplexing / demultiplexing unit core module 23. After being converted into an optical signal by the multi-channel integrated optoelectronic conversion transceiver 25, it is connected to the multi-core optical fiber of the user end through the multi-core pigtail 26 and the multi-core pigtail adapter 27. Each user accesses the 1G / 10G rate Serdes interface through a dedicated core optical fiber to achieve multi-service high-bandwidth access. The multi-channel integrated optoelectronic conversion transceiver module 25 can provide 12, 24, 32, and 48-channel specifications, and matches the 1G / 10G rate Serdes interface 24 of Serdes1-Serdes96 of the primary multiplexing / demultiplexing unit core module 23. A single primary multiplexing / demultiplexing unit can achieve access to 24, 32, 48, 64, and 96 households.

[0177] 2. Multi-service multiplexer of plug-in type:

[0178] like Fig.15 As shown, it is a schematic diagram of a plug-in type multi-service multiplexer solution, which may include: a secondary multiplexing / demultiplexing unit 6, a primary and backup power supply 13, a multicast service relay forwarding unit 17 and a primary multiplexing / demultiplexing unit 52, which respectively form independent functional boards, are connected to interfaces 49 and 50 of a backplane 48 through plug-in interfaces 47 and 51, and then connected to form a complete multi-service multiplexer. The functional module and interface definition of each unit of the multi-service multiplexer are the same as those of the all-in-one solution.

[0179] like Fig.15As shown, the central intention of the implementation scheme of the plug-in type multi-service multiplexer is: in a machine frame, a backplane 48 is configured and a main board, multiple function boards and sub-boards are inserted. In the plug-in type, the secondary multiplexing / demultiplexing unit is the main board, the main and standby power supply units and the multicast service relay forwarding unit are independent function boards, and the primary multiplexing / demultiplexing unit is the sub-board. The main board, the independent function board and the sub-board are all made into independent plug-in boards, and the interfaces inserted into the backplane 48 are connected to each other, thereby forming a complete multi-service multiplexer. Each primary multiplexing / demultiplexing unit sub-board can be configured with a variety of user-side interfaces such as 48 or 96 ports, and access to exclusive optical fiber users through a multi-channel integrated optoelectronic conversion interface.

[0180] The daughter boards of the multi-service multiplexer of the plug-in type can be equipped according to the increase in the actual number of access users, thereby reducing the initial investment cost of the access network central office equipment. However, the main board, backplane and daughter boards use plug-in interfaces, which have high requirements for circuit design and are more expensive than the integrated solution.

[0181] like Fig.16 The figure shows the functional definition and interface definition principle block diagram of the secondary multiplexing / demultiplexing unit 6 of the plug-in type of multi-service multiplexer. In the plug-in type, the secondary multiplexing / demultiplexing unit 6 is an independent plug-in. The network management interface 2 and the service side data service interface 3 are the same SFP optical modules as the integrated type. The power interface and the management interface are connected to the plug-in interface through the power supply bus 19 and the management bus 20 respectively, and connected to other functional boards through the backplane. The high-speed serial data service bus 12 of the primary multiplexing / demultiplexing unit, according to the characteristics of the plug-in type, the PCie high-speed data interface between the secondary multiplexing / demultiplexing unit and the primary multiplexing / demultiplexing unit is connected to the interface of the backplane through the data service bus 12. The core module of the secondary multiplexing / demultiplexing unit has 1 to 8 PCie interfaces, which can be connected to 1 to 8 primary multiplexing / demultiplexing units, and its rate includes but is not limited to 10G / 25G.

[0182] In order to ensure power supply, the main and standby power supply unit 13 of the multi-service multiplexer is provided with a main and standby power supply module and a main and standby power supply switching module that can support hot plugging. The main and standby power supply module can be composed of an AC protection module, a rectifier module, a switching power supply module, a DC protection module, a power management module and a main and standby power supply switching module. The main and standby power supply switching module supports hot plugging, and as long as one power supply is normal, the normal power supply of the equipment can be guaranteed.

[0183] like Fig.17 As shown, it is a schematic diagram of the implementation scheme of the main and standby power supply units of the plug-in type machine. In the plug-in type machine, the power supply interface and the management interface, the power supply bus 19 and the management bus 20 are respectively connected to the interface of the backplane through the plug-in interface 47 to realize power supply and monitoring management.

[0184] like Fig.18 As shown, it is an implementation scheme of the plug-in type multicast service relay forwarding unit. The multi-service multiplexer plug-in type multicast service relay forwarding unit 17 is mainly composed of a multicast service relay unit core module 18 and a physical layer interface and a bus interface adapted to the plug-in type.

[0185] The plug-in type multicast service relay forwarding unit 17 is an independent plug-in function board. The service side 10G / 25G Serdes interface is equipped with an SFP optical module to achieve access to the multicast service. The power interface and the management interface are connected to the power module and the management module through the power supply bus 19 and the management bus 20 through the backplane interface 47 to achieve power supply and management of this unit.

[0186] In the plug-in type model, the multicast service relay unit is an independent plug-in unit. The user-side PCie serial interface of the multicast service relay unit core module 18 can be connected to the backplane interface through the PCie multicast service bus 21, and connected to the first-level multiplexing / demultiplexing unit of the plug-in type model through the backplane interface to realize the relay and forwarding of multicast services.

[0187] like Fig.19 As shown, it is an implementation scheme of the first-level multiplexing / demultiplexing unit of the plug-in type. The first-level multiplexing / demultiplexing unit 52 of the multi-service multiplexer plug-in type is composed of a first-level multiplexing / demultiplexing unit core module 23 and a physical layer interface and a bus interface adapted to the plug-in type. The first-level multiplexing / demultiplexing unit 52 is an independent plug-in board. The service-side multicast service and data service are respectively connected to the multicast service bus 21 and the data service bus 12 through the 10G / 25GPCie serial interface, and the access of the multicast service and the data service is realized through the backplane interface 51. The power supply interface and the management interface are respectively connected to the power supply module and the management module through the power supply bus 19 and the management bus 20 through the backplane interface 51 to realize the power supply and management of this unit.

[0188] The user side of the primary multiplexing / demultiplexing unit is equipped with a multi-channel integrated optoelectronic conversion transceiver module 25, which is connected to the user side data interface 24 of the 1G / 10G rate Serdes of Serdes1 to Serdes96 of the primary multiplexing / demultiplexing unit core module 23, and is connected to the multi-core optical fiber of the user end through the multi-core pigtail 26 and the multi-core pigtail adapter 27. Each user accesses the 1G / 10G rate Serdes interface through an exclusive core optical fiber to achieve multi-service large bandwidth access. The multi-channel integrated optoelectronic conversion transceiver module 25 can provide 12, 24, 32, and 48-channel specifications, and matches the user side data interface 24 of the 1G / 10G rate Serdes of Serdes1 to Serdes96 of the primary multiplexing / demultiplexing unit core module 23. A single primary multiplexing / demultiplexing unit can achieve access to 24, 32, 48, 64, and 96 households.

[0189] 3. Multi-service multiplexer for split-type mother-child machine:

[0190] like Fig. 20 As shown, it is a schematic diagram of the implementation scheme of the multi-service multiplexer of the split-type mother-child machine type, and the multi-service multiplexer of the split-type mother-child machine type is a scheme consisting of a host and multiple multi-child machines. The host is composed of a multicast service relay forwarding unit 17, a secondary multiplexing / demultiplexing unit 6 and a main and standby power supply unit 13, and the multicast service relay forwarding unit 17, the secondary multiplexing / demultiplexing unit 6 and the main and standby power supply unit 13 still adopt a plug-in board structure to form the host, and only each primary multiplexing / demultiplexing unit and an independent power supply unit form a child machine.

[0191] like Fig. 20 The left side of the diagram shows the principle block diagram of the host, which is mainly composed of a secondary multiplexing unit 6, a main and standby power supply unit 13, a multicast service relay forwarding unit 17, a multicast service optical fiber interface 55, and a data service optical fiber interface 53. The host service side can be equipped with a 10G / 25G / 100G data service interface 3 and an independent 10G / 25G multicast service interface 1 to connect to the core network, and equipped with a network management interface 2 to achieve remote management. The right side is a principle block diagram of a plug-in type sub-machine 56, which is composed of a primary multiplexing / demultiplexing unit core module 23, a data service interface 58 facing the secondary multiplexing unit, and a plug-in type sub-machine multicast service interface 57 facing the secondary multiplexing unit, a user side data interface 24, a multi-channel integrated optoelectronic conversion transceiver 25, a multi-core pigtail 26, and a multi-core pigtail adapter 27. Multiple 10G / 25G rate interfaces can be equipped between the host and the sub-machine to achieve the access of multiple sub-machines.

[0192] Between the host and the slave, its multicast service optical fiber interface 55 and the multicast service interface 57 of the plug-in type slave facing the secondary multiplexing unit, the data service optical fiber interface 53 and the data service interface 58 facing the secondary multiplexing unit are connected by optical fibers. The user side of the slave can provide 24, 32, 48, 64, and 96 interface specifications. When a host is connected to 8 slaves, 192, 256, 384, 512, and 768 users can be connected.

[0193] The sub-machines of the split-type mother-and-child machine model multi-service multiplexer can be equipped according to the increase in the number of actual access users, thereby reducing the coverage cost of the access network central office equipment in the initial stage of network construction. In the mother-and-child machine solution, the secondary multiplexing / demultiplexing part becomes the main machine, which can access multiple sub-machines composed of primary multiplexing / demultiplexing units. The fiber connection between the mother-and-child machines is more suitable for high-rise buildings with large areas in cities and corporate users with customer-collecting business, and is also suitable for township networks with low user density. The sub-machines can be equipped according to the increase in the number of actual access users, thereby reducing the coverage cost of the access network central office equipment in the initial stage of network construction. The main machine and the sub-machine can also form a combination of a tree-structured network and a strip-structured network, which can greatly reduce the cost of optical fiber resources in environments such as multi-family residential areas and office buildings. However, when the main machine and the sub-machine are designed according to the 1U19-inch chassis, the volume is large, and the relative cost will be higher than the integrated machine structure and the plug-in structure.

[0194] like Fig.21 The figure shows the functional definition and interface definition principle block diagram of the secondary multiplexing / demultiplexing unit 6 in the multi-service multiplexer mother-child machine model. In the mother-child machine model, the secondary multiplexing / demultiplexing unit 6 is an independent plug-in board. The network management interface 2 and the data service interface 3 are the same as those of the integrated model, and are equipped with SFP optical modules to access the core network. The power interface and the management interface are respectively connected to the backplane plug-in interface through the power supply bus 19 and the management bus 20, and are connected to other functional boards through the backplane.

[0195] In the mother-child machine model, Serdes+ physical layer optical modules are selected between the secondary multiplexer / demultiplexer and the primary multiplexer / demultiplexer for communication via optical fiber connection. A 10G / 25G data service optical interface is used as the data service optical fiber interface 53 for accessing the primary multiplexer / demultiplexer unit. The core module of the secondary multiplexer / demultiplexer unit has 1 to 8 Serdes interfaces, which can access 1 to 8 sub-machines of the primary multiplexer / demultiplexer unit, and its transmission rate includes but is not limited to 10G / 25G.

[0196] like Fig. 22The main and standby power supply unit boards of the host and sub-machine of the mother-and-child machine model are shown, which are respectively equipped in the host and sub-machine chassis in a plug-in structure to supply power to the host and sub-machine. In order to ensure power supply, the main and standby power supply unit 13 of the multi-service multiplexer is provided with a main and standby power supply module and a main and standby power supply switching module that can support hot plugging. The main and standby power supply modules are composed of an AC protection module, a rectifier module, a switching power supply module, a DC protection module, a power management module and a main and standby power supply switching module. The main and standby power supply switching module supports hot plugging, and as long as one power supply is normal, the normal power supply of the equipment can be guaranteed. In the mother-and-child machine model, the power supply interface and the management interface are respectively connected to the backplane interface through the power supply bus 19 and the management bus 20 to realize power supply and monitoring management.

[0197] The implementation scheme of the multicast service relay forwarding unit of the parent-child machine model can be as follows Fig.23 As shown, the multi-service multiplexer mother-child machine type multicast service relay forwarding unit 17 is installed in the host in a plug-in type structure, and is composed of a plug-in type multicast service relay unit core module 54 and a physical layer interface adapted to the plug-in type, a power supply bus 19 and a management bus 20, and a backplane interface.

[0198] like Fig.23 The schematic diagram of the implementation scheme of the multicast service relay unit of the parent-child machine type is shown. The parent-child machine type multicast service relay forwarding unit 17 is an independent plug-in function board. The service side 10G / 25G Serdes interface is equipped with an SFP optical module to achieve access to the multicast service. The power interface and the management interface are connected to the power module and the management module through the power supply bus 19 and the management bus 20 through the backplane interface to achieve power supply and management of this unit.

[0199] In the mother-child machine model, Serdes+ physical layer optical module is selected to communicate through optical fiber connection between the multicast service relay forwarding unit and the first-level multiplexer / demultiplexer. The 10G / 25G multicast service optical interface is used as the multicast service optical fiber interface 55 for accessing the first-level multiplexer / demultiplexer unit. The core module has 1 to 8 Serdes interfaces, which can access 1 to 8 first-level multiplexer / demultiplexer unit sub-machines, and its transmission rate includes but is not limited to 10G / 25G.

[0200] The implementation scheme of the primary multiplexing / demultiplexing unit of the mother-child machine model can be as follows Fig.24 As shown, the primary multiplexing / demultiplexing unit of the multi-service multiplexer mother-child machine type is mainly composed of a primary multiplexing / demultiplexing unit core module 23 and a physical layer interface and a bus interface adapted to the plug-in type mechanism.

[0201] like Fig.24The diagram shows the implementation scheme of the primary multiplexing / demultiplexing unit of the mother-child machine type. The primary multiplexing / demultiplexing unit is an independent chassis. The multicast service interface 57 of the plug-in type sub-machine facing the secondary multiplexing unit and the data service interface 58 facing the secondary multiplexing unit are respectively connected to the multicast service optical fiber interface 55 and the data service optical fiber interface 53 of the host through optical fibers to realize the access of multicast services and data services. The transmission rate is 10G / 25G. The sub-machine is equipped with a network management interface 2, and the sub-machine is equipped with an independent power supply unit for power supply.

[0202] On the user side of the first-level multiplexing / demultiplexing unit of the slave machine, a multi-channel integrated optoelectronic conversion transceiver module 25 is provided, which is connected to the user-side data interface 24 of the 1G / 10G rate Serdes of Serdes1 to Serdes96 of the core module 23 of the first-level multiplexing / demultiplexing unit, and is connected to the multi-core optical fiber of the user end through the multi-core pigtail 26 and the multi-core pigtail adapter 27. Each user accesses the 1G / 10G rate Serdes interface through a dedicated optical fiber to achieve multi-service high-bandwidth access. The multi-channel integrated optoelectronic conversion transceiver module 25 can provide 12, 24, 32, and 48-channel specifications, and matches the user-side data interface 24 of the 1G / 10G rate Serdes of Serdes1 to Serdes96 of the core module 23 of the first-level multiplexing / demultiplexing unit. A single first-level multiplexing / demultiplexing unit can achieve access to 24, 32, 48, 64, and 96 households.

[0203] Specifically, the above-mentioned multi-service multiplexer can be composed of an FPGA chip or a dedicated chip that can provide a high-density interface and is endowed with an access network definition code, a large number of BOSAs, and multiple pigtail adapters. BOSA and pigtail flanges (pigtail adapters) are common devices in many devices. However, in this example, if the common BOSA and pigtail adapters used in other devices are directly used, the various indicators of the equipment can be achieved from the technical parameters, but it cannot meet the welding of dozens to nearly a hundred BOSAs and the docking, adaptation and lead-out of dozens to nearly a hundred pigtails arranged on a board. Based on this, in this example, for the core processing chip, BOSA and pigtail adapter of the multi-service multiplexer, a new product suitable for multi-service multiplexing and realizing high-density interfaces is given in this example, as described below:

[0204] 1) Core processing chip:

[0205] The main functions of the secondary multiplexing / demultiplexing module and the primary multiplexing / demultiplexing module of the multi-service multiplexer include: meeting the three interface definitions, four major features and five core functions of the access network. In particular, the primary multiplexing / demultiplexing module, while meeting the three interface definitions, four major features and five core functions of the access network, also needs to have multiple user access and multi-service multiplexing functions. According to the characteristics of the access network not interpreting signaling, being irrelevant to services and applications, and generally not containing switching functions, the access network needs to complete the functions of cross-connection, multiplexing and transmission. At the same time, in order to reduce the coverage cost and home access cost of the access network, it is necessary to meet the requirements of different sizes of the access network. Further, it is necessary to meet the characteristics of cost related to users, multiple types of access services, low traffic density, high interface density and low coverage cost. The core processing chip of the primary multiplexing / demultiplexing module must have 48, 96 user-side data interfaces including but not limited to Gigabit / 10 Gigabit (optional) rate bandwidth, so as to meet the exclusive use of a user-side high-bandwidth interface for each access user.

[0206] In order to meet the above requirements, FPGA chips that are assigned access network definition codes can be used in the early stage of development. In the later stage, in order to better reduce coverage costs and provide higher-density access interfaces and higher access bandwidth requirements, dedicated chips are needed to achieve higher interface density and lower overall machine costs.

[0207] 2) Multi-channel integrated photoelectric conversion transceiver components and multi-core pigtail adapters:

[0208] The user-side interface of the first-level multiplexing / demultiplexing module of the multi-service multiplexer must at least reach, including but not limited to, 24, 32, 48, 64, and 96 channels and interfaces with Gigabit / 10 Gigabit (optional) rates. These high-density interfaces are ultimately converted into optical interfaces and connected to a single optical fiber core for each user of the access network, thereby realizing a technical solution of an all-optical broadband access network with exclusive optical fiber multi-service multiplexing based on Ethernet technology. Therefore, a large number of optoelectronic conversion transceiver devices BOSA and a large number of pigtail adapters can be integrated in the equipment. In order to meet the arrangement of this high-density BOSA and the adaptation of multi-channel pigtails, a multi-channel integrated optoelectronic conversion transceiver and a multi-core pigtail adapter are proposed in this example, so as to accommodate the welding of more BOSAs on a limited circuit board. The number of channels of the multi-channel integrated optoelectronic conversion transceiver can include but is not limited to 12 channels and 24 channels, and at the same time, it is combined with multi-core pigtails and multi-core pigtail adapters. The number of cores of the multi-core pigtails and multi-core pigtail adapters includes but is not limited to 12 cores and 24 cores, so that more optical fiber interfaces can be adapted on the limited chassis panel, so that the number of user-side optical interfaces of the multi-service multiplexer composed of multiple first-level multiplexing / demultiplexing units reaches but is not limited to 192, 256, 384, 512, and 768, so as to achieve the purpose of high interface density and low coverage cost of access network local equipment.

[0209] 3) Multi-core pigtail adapter:

[0210] The multi-core pigtail adapter is a multi-core pigtail adapter that is adapted to the multi-core pigtails of the multi-channel integrated optoelectronic transceiver in the multiplexer chassis and the multi-core optical cable of the access network. In implementation, each single-core pigtail in the multi-channel integrated optoelectronic transceiver is coiled in order in the fiber coiling cabin at the rear end of the integrated base, and converged into a multi-channel pigtail bundle. The multi-channel pigtail bundle is fixedly led out through the lead-out hole and reserved for an appropriate length, and then encapsulated into the female head of the multi-core pigtail adapter to form a multi-channel integrated optoelectronic conversion transceiver. Through this multi-core pigtail adapter method for the multi-channel integrated optoelectronic transceiver, not only the problem of accommodating more optical interfaces on the limited chassis panel is solved, but also the printed board in the chassis is free of multiple pigtails that are randomly entangled. After the pigtail bundle led out from the fiber coiling cabin is encapsulated into the female head of the multi-core pigtail adapter, it can be inserted into the multi-core pigtail adapter seat of the chassis panel, and connected with the male head of the multi-core pigtail adapter outside the chassis through the multi-core pigtail adapter seat, so as to realize more optical fiber interfaces on the limited chassis panel.

[0211] The principle block diagram of building an access network based on the above multi-service multiplexer can be shown as follows: Figure 2 As shown, the exclusive fiber-optic broadband access system based on Ethernet technology can meet the access needs of various users in private networks such as home users, enterprises, and schools.

[0212] like Figure 2 The figure shows the principle diagram of the multi-service multiplexer based on Ethernet technology and exclusive optical fiber applied to the access network. The uplink and downlink services of the communication services, Internet data services and IPTV multicast services accessed by each user are transmitted on a single optical fiber using an uplink wavelength and a downlink wavelength respectively, which is collectively referred to as the single-fiber dual-wave transmission mode. Each user accesses the user-side interface of the central office multi-service multiplexer of the access network in a way of exclusive use of a single optical fiber. Therefore, the multi-service multiplexing type fiber-to-the-home access network based on Ethernet technology mainly consists of two parts: the central office equipment multi-service multiplexer and the comb-shaped architecture ODN. Since the primary multiplexing / demultiplexing module of the multi-service multiplexer has 48 or 96 user-side data interfaces including but not limited to Gigabit / 10 Gigabit (optional) rate bandwidth, it can meet the requirement that each access user has an exclusive user-side high-bandwidth interface, thereby providing each user with Gigabit / 10 Gigabit (optional) rate access bandwidth at a lower coverage cost.

[0213] from Figure 2It can be seen from the figure that the technical solution of the exclusive optical fiber multi-service multiplexing all-optical network broadband access network based on Ethernet technology is a sparse network in which each user has an exclusive optical fiber core. The central office equipment multi-service multiplexer 29 provides N multi-core fiber pigtail adapter interfaces 30 on the user side, which can adapt N multi-core fiber pigtails 31 including but not limited to 24, 32, 48, 64, and 96 cores. Through the ODF terminal board 32 in the central office cabinet, the multi-core optical cable 33 from the central office to the corridor, the corridor optical fiber cable connecting the terminal board 34 and the household optical fiber 35, each optical fiber-to-the-home user 36 is connected to the central office equipment multi-service multiplexer 29 with an exclusive optical fiber core, so that each multi-service multiplexer can access but not limited to 192; 256; 384; 512, 768 exclusive optical fiber users.

[0214] Figure 2 The access network shown is composed of an exclusive optical fiber multi-service multiplexer based on Ethernet technology, and replaces the access method of the PON system where each PON port shares a core of optical fiber to access multiple users through an optical splitter with a single core optical fiber access method for each user, replaces the tree network architecture of the PON network with a strip network architecture, and replaces the PON system's downstream data transmission in a broadcast manner and upstream data transmission mechanism using a time division multiplexing technology with a unicast transmission mechanism, canceling the existing PON network's home gateway ONU, thereby achieving the effect of replacing the expensive home gateway ONU and complex time division multiplexing transmission technology with a cheap optical fiber medium. Without the need to equip the user's home with an access network gateway device, the user can access the home electrical port router 38 through the optical fiber transceiver 37, or directly access the optical fiber router 39, and access various application terminals such as indoor TVs, computers, and mobile phones through the router.

[0215] Above Figure 2 The multi-service multiplexer 29 is different from the existing communication operator PON network and switch network in that, in addition to the data service interface 3, an independent multicast service interface 1 and a multicast service relay forwarding function module 17 are innovatively set up. Its main purpose is to transmit the IPTV multicast service to the access network end through an independent channel in the backbone network, and directly connect to the multicast service independent interface 1 of the multi-service multiplexer, and forward it to the multiplexer first-level multiplexing / demultiplexing unit 22 through the multiplexer multicast service relay forwarding function module 17, and distribute it to the end user together with other services through the multicast function and multicast to unicast function of the multiplexer first-level multiplexing / demultiplexing unit core module 23, thereby eliminating the IPTV multicast service multicast replication point in the core network, which can greatly improve the transmission quality of radio and television live broadcast services and fully meet the broadcast-level transmission quality requirements of high-definition, ultra-high-definition 4K / 8K, and VR / AR video.

[0216] In the Ethernet-based exclusive fiber-optic multi-service multiplexing broadband access network system, the integrated model, plug-in model, and mother-and-child model, as well as the flexible configuration of the user-side Gigabit / 10 Gigabit interface, are not only suitable for residential areas, but also for flexible access and flexible allocation of bandwidth requirements in different environments such as park environments, government agencies and groups. Compared with the existing PON network, the Ethernet-based exclusive fiber-optic broadband access system in this example has the following advantages: the central office equipment has more optical ports on the user side, one optical port for each user; the number of optical cable cores from the central office box to the unit box is large, and each user has a dedicated optical fiber core; the user's home does not have an access network home gateway ONU, and each user has a dedicated optical fiber core to replace the PON network home gateway ONU device; the user access bandwidth is large: including but not limited to 1000M, and the average cost per household is low.

[0217] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0218] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0219] Although the present application provides method operation steps as described in the embodiments or flowcharts, more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the actual device or client product is executed, it can be executed in the order of the method shown in the embodiments or the drawings or in parallel (for example, in a parallel processor or multi-threaded processing environment).

[0220] For the convenience of description, the above devices are described in various modules according to their functions. Of course, when implementing the embodiments of this specification, the functions of each module can be implemented in the same or more software and / or hardware, or the module implementing the same function can be implemented by a combination of multiple sub-modules or sub-units. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0221] Those skilled in the art also know that, in addition to implementing the controller in a purely computer-readable program code, the controller can be made to implement the same function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, such a controller can be considered as a hardware component, and the devices for implementing various functions included therein can also be considered as structures within the hardware component. Or even, the devices for implementing various functions can be considered as both software modules for implementing the method and structures within the hardware component.

[0222] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0223] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0224] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0225] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0226] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0227] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0228] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems or computer program products. Therefore, the embodiments of this specification may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0229] The present specification embodiments may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present specification embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0230] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, in the absence of mutual contradiction, a person skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0231] The above is only an example of the embodiment of the present specification and is not intended to limit the embodiment of the present specification. For those skilled in the art, the embodiment of the present specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present specification shall be included in the scope of the claims of the embodiment of the present specification.

Claims

1. A central office equipment multi-service multiplexer, characterized in that: include: Secondary multiplexing and demultiplexing units, multicast service units, primary and standby power supply units, and M primary multiplexing and demultiplexing units, where M is a positive integer, where: The secondary multiplexing and demultiplexing unit includes: a service side core network data service interface, a secondary multiplexing and demultiplexing module, a network management interface, a network management module, a main control CPU module, a storage module, an I / O management CPU module, and M data service interfaces that can be connected to M primary multiplexing and demultiplexing units; The multicast service unit includes: a core network side multicast service interface, a multicast service relay module and M multicast service interfaces that can access M primary multiplexing and demultiplexing units; The main and standby power supply unit comprises: a main and standby power supply module and a main and standby power supply management module; The primary multiplexing and demultiplexing unit includes: a data service interface and a multicast service interface that can be connected to the secondary multiplexing and demultiplexing unit and the multicast service relay module, a primary multiplexing and demultiplexing module, W user-side multi-channel integrated optoelectronic conversion transceiver devices, multi-core pigtails and multi-core pigtail adapters, wherein W is a positive integer; Among them, the first-level multiplexing and demultiplexing unit is provided with a user interface with a gigabit or 10 gigabit selectable rate having the function of the access network user function node UNI, and is converted into a multi-channel optical interface through a multi-channel integrated optoelectronic conversion and transceiver on the user side, and then the pigtail of the multi-channel optical interface is adapted into a multi-core pigtail, and then connected to the multi-core pigtail adapter, and each pigtail of the multi-core pigtail adapted by the multi-core pigtail adapter is connected to a single-core optical fiber exclusively used by each user of the access network, so that each user has an exclusive single-core optical fiber access to the user-side interface of the multi-service multiplexer of the central office equipment.

2. The central office equipment multi-service multiplexer according to claim 1, characterized in that: The core network side of the secondary multiplexing and demultiplexing unit is provided with a multi-rate service function interface with an access network SNI function node to meet the connection requirements with the core network, wherein the multi-rate includes the following: 10G, 25G and 100G; The secondary multiplexing and demultiplexing unit includes: an optional rate data service interface for accessing M primary multiplexing units to meet the access requirements of the M primary multiplexing and demultiplexing units, wherein the optional rates include: 10G and 25G.

3. The central office equipment multi-service multiplexer according to claim 1, characterized in that: Each primary multiplexing and demultiplexing unit is provided with a 10G or 25G data service interface connected to the secondary multiplexing and demultiplexing unit, and is connected to one of the M data service interfaces provided by the secondary multiplexing and demultiplexing unit through the 10G or 25G data service interface to realize the access, cross-connection, multiplexing and transmission functions of communication services, broadband Internet services and data services; Each first-level multiplexing and demultiplexing unit is also provided with a 10G or 25G multicast service interface connected to the multicast service unit, and is connected to one of the M multicast service interfaces provided by the multicast service unit through the 10G or 25G multicast service interface, so as to forward the content requested by the user to listen or watch to the user through the multicast to unicast mechanism.

4. The central office equipment multi-service multiplexer according to claim 3, characterized in that: The number of user interfaces set in each first-level multiplexing and demultiplexing unit is m, and the value of m is one of the following: 48, 64, 96, and it is converted into multi-channel optical interfaces through W multi-channel integrated optoelectronic conversion and receiving devices, and the value of W is one of the following: 4, 6, 8, where m and W are positive integers.

5. The central office equipment multi-service multiplexer according to claim 4, characterized in that: The user-side multi-channel integrated optoelectronic conversion transceiver device of the primary multiplexing and demultiplexing unit includes: a multi-grid integrated optical transceiver core installation base, a pigtail fiber compartment, a multi-core pigtail lead-out hole, a multi-core pigtail and a multi-core pigtail adapter female head, wherein: An integrated base with L grids is provided in each multi-channel integrated optoelectronic conversion and transceiver device. In each grid, an optoelectronic conversion tube core with 1 receiving and 1 transmitting, a preamplifier circuit, a combiner / splitter wave plate, a pigtail adapter and a single-core pigtail led out of the pigtail adapter are installed respectively. The single-core pigtail led out of the combiner / splitter wave plate in each grid is orderly coiled in a fiber coiling cabin at the rear end of the L grid integrated base, and then converged into a multi-core pigtail with L cores. The multi-core pigtail with L cores is fixed in the fiber coiling cabin for tensile resistance, and then led out through the lead-out hole of the fiber coiling cabin. After the led-out multi-core pigtail reserves a preset length, it is connected to the multi-core pigtail adapter female head, wherein L is a positive integer, and the value of L is one of the following: 12, 16, 24.

6. The central office equipment multi-service multiplexer according to any one of claims 1 to 5, characterized in that: The central office equipment multi-service multiplexer includes at least one of the following: a plug-in type multi-service multiplexer, an integrated type multi-service multiplexer, and a split type mother-child type multi-service multiplexer.

7. The central office equipment multi-service multiplexer according to claim 6, characterized in that: In an integrated multi-service multiplexer, the core modules of the secondary multiplexing and demultiplexing unit, the multicast service unit, the primary and secondary power supply units and the primary multiplexing and demultiplexing unit are deployed on a circuit board in a chassis, and the internal bus and the external physical interface between the functional units are configured to form the functional units of the multi-service multiplexer, wherein the PCie high-speed data interfaces of the secondary multiplexing and demultiplexing unit and the primary multiplexing and demultiplexing unit are connected through a bus, and the core module of the secondary multiplexing and demultiplexing unit has 1 to 8 PCie interfaces, which can be connected to 1 to 8 primary multiplexing and demultiplexing units.

8. The central office equipment multi-service multiplexer according to claim 7, characterized in that: The main and standby power supply modules include: an AC protection module, a rectifier module, a switching power supply module, a DC protection module, a power management module and a main and standby power supply switching module. The main and standby power supply management module includes: a main and standby power supply switching module that supports hot plugging; the power interface of the main and standby power supply unit uses the power supply bus as the power supply bus interface of the integrated model, and the main and standby power supply unit adopts an independent plug-in board to supply power to each functional unit through the backplane interface.

9. The central office equipment multi-service multiplexer according to claim 6, characterized in that: In the multi-service multiplexer of the plug-in type, the secondary multiplexing and demultiplexing unit, the main and standby power supply unit, the multicast service unit and the primary multiplexing and demultiplexing unit respectively form independent functional boards, which are connected to form a complete multi-service multiplexer through the plug-in interface. The PCie high-speed data interface of the secondary multiplexing and demultiplexing unit and the primary multiplexing and demultiplexing unit is connected through a bus. The core module of the secondary multiplexing and demultiplexing unit has 1 to 8 PCie interfaces, which can be connected to 1 to 8 primary multiplexing and demultiplexing units. Among them, the secondary multiplexing and demultiplexing unit is the main board, the main and standby power supply units and the relay forwarding units in the multicast service unit are independent functional boards, and the primary multiplexing and demultiplexing unit is a sub-board. The main board, independent functional board and sub-board are all made into independent plug-in boards and inserted into the backplane interface to connect with each other to form a multi-service multiplexer. Among them, each primary multiplexing and demultiplexing unit sub-board can be configured with a 48-port or 96-port user-side interface.

10. The central office equipment multi-service multiplexer according to claim 6, characterized in that: In the split-type multi-service multiplexer of the parent-child machine model, the relay forwarding unit, the secondary multiplexing and demultiplexing unit and the main and standby power supply units in the multicast service unit form a host with a plug-in structure, a primary multiplexing and demultiplexing unit and an independent power supply unit form a sub-machine, and multiple primary multiplexing and demultiplexing units and multiple independent power supply units form multiple sub-machines. Multiple 10G / 25G rate interfaces are equipped between the host and the sub-machine to realize the access of multiple sub-machines. The multicast service optical port and the multicast service optical port, the data service optical port and the data service optical port between the host and the sub-machine are connected by optical fibers respectively. The user side of the sub-machine can provide 24, 32, 48, 64, and 96 interface specifications. When a host is connected to 8 sub-machines, 192, 256, 384, 512, and 768 users can be connected.

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