Shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism

Abstract

This invention discloses a shared point-to-multipoint Ethernet transmission system based on the TDMA transmission mechanism in the field of communication technology, comprising: a main Ethernet optical port, at least one slave Ethernet optical port, and a passive optical fiber distribution network. The main Ethernet optical port performs time slot fragmentation calculation, OAM PDU message generation, transmission and reception, and management and control of the main Ethernet optical port physical unit, which is used to complete Ethernet data transmission and reception. At least one slave Ethernet optical port is used to perform slave Ethernet optical port transmission time slot control and OAM PDU message transmission and reception processing, and the slave Ethernet optical port physical unit is used to complete Ethernet data transmission and reception. The passive optical fiber distribution network is used to realize communication between the main Ethernet optical port and at least one slave Ethernet optical port. The networking form and access architecture use a PON system framework, and use traditional Ethernet chips to replace dedicated PON chips. The EFM OAM extended information domain is used to realize terminal access control, bandwidth control, and transmission time slot allocation.

Description

Technical Field

[0001] The present invention relates to the technical field of communication, and in particular to a shared point-to-multipoint Ethernet transmission system based on a TDMA transmission mechanism. Background Art

[0002] Influenced by factors such as the growth of Internet usage, cloud computing, the Internet of Things (IoT), 5G network deployment and the increase in video traffic, more and more requirements have been put forward for broadband. With the popularization of all-optical access technology, the use of all-optical access technology at the last access point in small and medium-sized parks, hotels, schools, etc. has greatly increased the use of optical fibers, optical modules, and optical access chips. Generally speaking, PON technology and optical Ethernet technology will be used as solutions for all-optical technology.

[0003] The PON system mainly consists of three parts, including the optical line terminal (OLT) located in the central office, the optical network unit (ONU) or optical network terminal (ONT) distributed on the user side, and the optical distribution network (ODN), which is responsible for connecting the OLT with each ONU. The key technical support of PON includes the multiple access control protocol (MPCP) from the Ethernet optical port to the main Ethernet optical port channel, the plug-and-play problem of the ONU, the ranging and delay compensation protocol of the OLT, etc. The implementation of this technology is relatively complex, requiring dedicated chips and optical modules, and the cost is high.

[0004] Ethernet all-optical technology is to interconnect all service ports using optical ports. Ethernet technology chips are mature and low-cost, but because Ethernet port interconnection requires point-to-point connection, when there are multiple ports at the remote end, the local end must also use multiple ports to correspond to it, and ODN (passive optical distribution network) cannot be used to achieve point-to-multipoint transmission. In addition, the transmission line also requires multiple physical optical fibers. For example, a large amount of trunk optical fiber resources will be consumed under a transmission ratio of 1:64. If you want to save trunk optical fiber resources, you need to use different transmission wavelengths for multiple ports, and use multiplexing technology (DWDM) to achieve single trunk optical fiber transmission, resulting in too many ports occupied. When using DWDM technology, each port needs to use a different wavelength, which leads to higher prices for optical devices or more fiber resources occupied.

[0005] Therefore, the present invention proposes a shared point-to-multipoint Ethernet transmission system based on the TDMA transmission mechanism, which uses the PON system framework in the networking form and access architecture, and uses traditional Ethernet chips to replace dedicated PON chips, and uses the EFM OAM extended information domain to implement terminal access control, bandwidth control and transmission time slot allocation. It can use the framework of PON access technology to meet the requirements of ODN network deployment, and can combine the cost performance of Ethernet chips and use OAMPDU messages for configuration management, which has great advantages in some application scenarios where configuration management is simple and cost performance is pursued. Summary of the invention

[0006] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of the present invention to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In order to solve the above technical problems, the present invention provides a shared point-to-multipoint Ethernet transmission system based on a TDMA transmission mechanism, which adopts the following technical solutions: comprising: a master Ethernet optical port, at least one slave Ethernet optical port and a passive optical fiber distribution network, wherein the master Ethernet optical port comprises a master Ethernet optical port control unit, which is used to complete time slot slicing calculation, generation, reception and transmission of OAM PDU messages, and management and control of the master Ethernet optical port physical unit, and the master Ethernet optical port physical unit is used to complete Ethernet data reception and transmission; at least one slave Ethernet optical port comprises a slave Ethernet optical port control unit, which is used to complete the transmission time slot control of the slave Ethernet optical port, the reception and transmission of OAM PDU messages, and the slave Ethernet optical port physical unit is used to complete Ethernet data reception and transmission; and the passive optical fiber distribution network is used to realize communication between the master Ethernet optical port and at least one slave Ethernet optical port.

[0008] Optionally, the main Ethernet optical port control unit includes an OAM PDU transceiver processing module 1, which is used to complete the reception, parsing and encapsulation and sending of OAM management messages, and the OAM management messages include the number, authentication and scheduling policy information of the slave Ethernet optical port; a scheduling management control module 1, which is used to receive the OAM management message sent from the OAM PDU transceiver processing module 1 after parsing, and send the OAM management message to the time slot slicing management module, and receive the time slot slicing data of the time slot slicing management module, submit it to the Ethernet MAC module 1 sent by the OAM PDU transceiver processing module 1 to the main Ethernet optical port, and then forward it to all slave Ethernet optical ports. At the same time, the physical unit of the main Ethernet optical port is managed; the time slot slicing management module is used to receive the OAM management message sent from the scheduling management control module 1, generate the corresponding time slot slicing data according to the preset scheduling rules, and transmit it back to the scheduling management control module 1.

[0009] Optionally, the main Ethernet optical port physical unit includes a main Ethernet optical module, connected to a passive optical fiber distribution network, for sending and receiving Ethernet data; an Ethernet MAC module 1, for completing the sending and receiving of OAM management messages, the OAM management messages include OAM protocol messages OAMu and OAM protocol messages OAMd, and the management configuration of the Ethernet data is executed by the scheduling management control module 1.

[0010] Optionally, the OAM PDU transceiver processing module 1 completes the reception, parsing and encapsulation and sending of OAM management messages as follows: from the Ethernet optical port to the main Ethernet optical port, the OAM PDU transceiver processing module 1 receives the OAM protocol message OAMu sent from the Ethernet optical port and parses it, and then sends the parsed protocol message data to the scheduling management control module 1; from the main Ethernet optical port to the slave Ethernet optical port, the time slot management data from the scheduling management control module 1 is encapsulated into the OAM protocol message OAMd from the main Ethernet optical port to the slave Ethernet optical port, inserted into the Ethernet MAC module 1 of the main Ethernet optical port, and then forwarded to all slave Ethernet optical ports.

[0011] Optionally, the slave Ethernet optical port control unit includes an OAM PDU transceiver processing module 2, which is used to complete the reception, parsing and encapsulation and sending of OAM management messages; a scheduling management control module 2, which is used to receive the management protocol sent after parsing from the OAM PDU transceiver processing module 2, and send the management protocol to the optical module control module to manage the slave Ethernet optical port physical unit, and the management protocol includes the time slot slicing data information sent by the main Ethernet optical port; the optical module control module is used to receive the time slot slicing data sent from the scheduling management control module 2, parse the data, complete the system timestamp synchronization, and then control the sending of the slave Ethernet optical module according to the time slot slicing data information.

[0012] Optionally, the slave Ethernet optical port physical unit includes a slave Ethernet optical module, connected to a passive optical fiber distribution network, used for receiving and sending Ethernet data, and the optical module control module turns on and off the slave Ethernet optical module in a specific time slot; an Ethernet MAC module 2, used to complete the reception and sending of OAM management messages, and the management configuration of the OAM management messages is executed by the scheduling management control module 2.

[0013] Optionally, the OAM PDU transceiver processing module 2 completes the reception, parsing and encapsulation and sending of OAM management messages as follows: in the direction from the main Ethernet optical port to the slave Ethernet optical port, the OAM PDU transceiver processing module 2 receives the OAM protocol message OAMd sent by the main Ethernet optical port and parses it, and then sends the parsed protocol message data to the scheduling management control module 2; in the direction from the Ethernet optical port to the main Ethernet optical port, the Ethernet data from the scheduling management control module 2 is encapsulated into the OAM protocol message OAMu from the Ethernet optical port to the main Ethernet optical port, inserted into the Ethernet MAC module 2 of the slave Ethernet optical port, and then forwarded to the main Ethernet optical port.

[0014] Optionally, the passive fiber optic distribution network includes a trunk optical fiber, an optical distributor and multiple branch optical fibers. In the direction from the main Ethernet optical port to the slave Ethernet optical port, the passive fiber optic distribution network distributes the business of the main Ethernet optical port carried by the trunk optical fiber from the trunk optical fiber to the multiple branch optical fibers connected to the slave Ethernet optical ports through the optical distributor; in the direction from the Ethernet optical port to the main Ethernet optical port, the passive fiber optic distribution network aggregates the business carried on the multiple branch optical fibers to the trunk optical fiber through the optical distributor.

[0015] Optionally, both the OAM PDU transceiver processing module 1 and the OAM PDU transceiver processing module 2 use the EFM OAM extended information field to implement access control, bandwidth control and transmission time slot allocation of the master Ethernet optical port and the slave Ethernet optical port.

[0016] A working method of the shared point-to-multipoint Ethernet transmission system based on the TDMA transmission mechanism as described above, the method comprising:

[0017] 1. In the direction from the master Ethernet optical port to the slave Ethernet optical port, the master Ethernet optical port broadcasts the downlink data to the slave Ethernet optical ports in multiple existing systems through the optical distributor; in the direction from the slave Ethernet optical port to the master Ethernet optical port, the master Ethernet optical port allocates the time slots through the built-in master Ethernet optical port control unit.

[0018] Second, the fixed total transmission time is sliced. This time slice corresponds to the transmission time slot from each slave Ethernet optical port to the master Ethernet optical port. The master Ethernet optical port uses the OAM PDU message to send the release time slot number and the synchronous broadcast timestamp of each connected slave Ethernet optical port to the slave Ethernet optical port. After receiving the synchronous broadcast timestamp and the release time slot number, the slave Ethernet optical port sends the uplink message in the corresponding time slot received.

[0019] 3. In a specific time slice, multiple slave Ethernet optical ports with different address information take turns to send data in the specified time slot, thus realizing the time division multiple access transmission mode;

[0020] The specific method of allocating the time slots is as follows:

[0021] 1) Time division multiple access (TDMA) is used. Each slave Ethernet optical port is evenly divided into time slots within the time slice for transmission from the Ethernet optical port to the main Ethernet optical port. When the slave Ethernet optical port receives an OAM PDU message as a transmission time slot operation code, the corresponding transmission time slot offset is calculated. The time slot offset is the product of the slave Ethernet optical port ID number and the time slice. The time slice allocation mechanism includes the on / off time of the slave Ethernet optical module laser, gain adjustment, and clock recovery time. The specific time is required to be within 1us.

[0022] 2) When the time slot length changes, when someone joins or leaves the system from the Ethernet optical port, the allocated transmission time slot will be recalculated to ensure that the bandwidth can keep up with the changes in the system;

[0023] 3) The slave Ethernet optical port can report the cache occupancy rate through the OAM PDU message operation code from the Ethernet optical port to the main Ethernet optical port according to the cache occupancy rate. The main Ethernet optical port can adjust the number of time slices sent from the Ethernet optical port to the main Ethernet optical port according to the reported situation.

[0024] Among them, the method of joining the system from the Ethernet optical port is:

[0025] The main Ethernet optical port adds a silent operation code. The one that has joined is not sent. The one that has not joined sends a join request immediately after a random delay. The join request is sent from the Ethernet optical port to the main Ethernet optical port. The main Ethernet optical port confirms the join request and assigns the slave Ethernet optical port ID number. At the same time, the time counter synchronization is initialized. The OAM link between the slave Ethernet optical port and the main Ethernet optical port is activated with a period of 1s. The main Ethernet optical port uses the OAM PDU message to send the release time slot number and synchronization broadcast timestamp of the joined slave Ethernet optical port to the slave Ethernet optical port.

[0026] In summary, the present invention includes at least one of the following beneficial effects:

[0027] The PON system framework is used in networking and access architecture, and the traditional Ethernet chip is used to replace the dedicated PON chip, and the EFM OAM extended information domain is used to implement terminal access control, bandwidth control and transmission time slot allocation. It can not only use the framework of PON access technology to meet the requirements of ODN network deployment, but also combine the cost performance of Ethernet chips and use OAM PDU messages for configuration management, which has great advantages in some application scenarios where configuration management is simple and cost performance is pursued. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0029] Figure 1 It is a principle block diagram of a shared point-to-multipoint Ethernet transmission system based on a TDMA transmission mechanism of the present invention;

[0030] Figure 2 It is the OAMPDU message format table diagram of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of the custom OAM PDU message format of the present invention;

[0032] Figure 4 The present invention is a schematic diagram of a process of adding an Ethernet optical port entity to a shared point-to-multipoint Ethernet transmission system based on a TDMA transmission mechanism. DETAILED DESCRIPTION

[0033] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiment 1

[0037] The present invention discloses a shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism Figure 1 As shown, it includes three parts, namely: a main Ethernet optical port, at least one slave Ethernet optical port 1-N and a passive optical fiber distribution network (ODN).

[0038] The main Ethernet optical port consists of a main Ethernet optical port control unit and a main Ethernet optical port physical unit. The main Ethernet optical port control unit is used to complete the time slot slicing calculation, the generation and reception of OAM PDU messages, and the management and control of the main Ethernet optical port physical unit. It is the core control part of the main Ethernet optical port. The main Ethernet optical port physical unit is used to complete the Ethernet data reception and transmission;

[0039] At least one slave Ethernet optical port, including a slave Ethernet optical port control unit, used to complete the transmission time slot control of the slave Ethernet optical port, the transceiver processing of the OAM PDU message, and a slave Ethernet optical port physical unit, used to complete the Ethernet data transceiver;

[0040] A passive optical fiber distribution network is used to achieve communication between a master Ethernet optical port and at least one slave Ethernet optical port.

[0041] Reference Figure 1 ,Detailedly, in this embodiment, the main Ethernet optical port control unit includes a scheduling management control module 1, a time slot slicing management module and an OAM PDU transceiver processing module 1;

[0042] The scheduling management control module 1 is used to receive the OAM management message sent by the OAM PDU transceiver processing module 1 after parsing, and send the OAM management message to the time slot fragmentation management module, and receive the time slot fragmentation data of the time slot fragmentation management module, submit it to the Ethernet MAC module 1 of the main Ethernet optical port sent by the OAM PDU transceiver processing module 1, and then forward it to all slave Ethernet optical ports, and at the same time, manage the physical unit of the main Ethernet optical port;

[0043] The time slot slicing management module completes the scheduling management of each time slot in the system that sends data from the Ethernet optical port. It is specifically used to receive the total length of the time slot and the number of online timeslots from the Ethernet optical port sent from the scheduling management control module 1, generate corresponding time slot slicing data according to the preset scheduling rules, and transmit it back to the scheduling management control module 1.

[0044] OAM PDU transceiver processing module 1, used to complete the reception, analysis and encapsulation and transmission of OAM management messages, the OAM management messages include the number, authentication and scheduling policy information of the Ethernet optical port;

[0045] The OAM PDU transceiver processing module 1 completes the reception, parsing and encapsulation and sending of OAM management messages. Specifically, in the upstream direction (from the Ethernet optical port to the main Ethernet optical port), the OAM PDU transceiver processing module 1 receives the OAM protocol message OAMu (upstream OAM PDU) sent from the Ethernet optical port and parses it, and then sends the parsed protocol message data to the scheduling management control module 1; in the downstream direction (from the main Ethernet optical port to the slave Ethernet optical port), the time slot management data from the scheduling management control module 1 is encapsulated into the OAM protocol message OAMd (OAMd, downstream OAM PDU) from the main Ethernet optical port to the slave Ethernet optical port, which is inserted into the Ethernet MAC module 1 and sent to all the slave Ethernet optical ports.

[0046] In this embodiment, the main Ethernet optical port physical unit includes a main Ethernet optical module and an Ethernet MAC module 1.

[0047] The main Ethernet optical module is connected to the passive optical fiber distribution network and supports the burst receiving optical module to complete the transmission and reception of Ethernet data.

[0048] Ethernet MAC module 1, a standard Ethernet MAC, is used to complete the sending and receiving of OAM management messages. OAM management messages include OAM protocol messages OAMu and OAM protocol messages OAMd, wherein protocol messages OAMu and protocol messages OAMd are the same and can both be defined in standards or customized; the management configuration of Ethernet data is executed by the scheduling management control module 1.

[0049] Reference Figure 1 , in detail, in this embodiment, the slave Ethernet optical port control unit includes a scheduling management control module 2, an optical module control module and an OAM PDU transceiver processing module 2;

[0050] The scheduling management control module 2 is used to receive the management protocol sent after parsing from the OAM PDU transceiver processing module 2, which includes the time slot fragmentation data information sent by the main Ethernet optical port. The scheduling management control module 2 sends the above information to the optical module control module to open and close the slave Ethernet optical module in a specific time slot;

[0051] The optical module control module is used to receive the time slot fragmentation data sent from the scheduling management control module 2, parse the data, complete the system timestamp synchronization, and then control the transmission from the Ethernet optical module according to the time slot fragmentation data information.

[0052] The OAM PDU transceiver processing module 2 is used to complete the reception, parsing and encapsulation and sending of OAM management messages; specifically: in the direction from the main Ethernet optical port to the slave Ethernet optical port, the OAM PDU transceiver processing module 2 receives the OAM protocol message OAMd sent by the main Ethernet optical port and parses it, and then sends the parsed protocol message data to the scheduling management control module 2; in the direction from the slave Ethernet optical port to the main Ethernet optical port, the Ethernet data from the scheduling management control module 2 is encapsulated into the OAM protocol message OAMu from the slave Ethernet optical port to the main Ethernet optical port, inserted into the Ethernet MAC module 2 of the slave Ethernet optical port, and then forwarded to the main Ethernet optical port.

[0053] In this embodiment, the slave Ethernet optical port physical unit includes a slave Ethernet optical module and an Ethernet MAC module 2.

[0054] A slave Ethernet optical module is connected to the passive optical fiber distribution network and is used for transmitting and receiving Ethernet data. The optical module control module turns on and off the slave Ethernet optical module in a specific time slot;

[0055] The Ethernet MAC module 2 is a standard Ethernet MAC, which is used to complete the sending and receiving of OAM management messages. The management configuration of the OAM management messages is executed by the scheduling management control module 2.

[0056] Reference Figure 1 In detail, in this embodiment, the passive fiber optic distribution network includes a trunk optical fiber, an optical distributor and multiple branch optical fibers. In the downstream direction (from the main Ethernet optical port to the slave Ethernet optical port), the passive fiber optic distribution network distributes the business of the main Ethernet optical port carried by the trunk optical fiber from the trunk optical fiber to the multiple branch optical fibers connected to the slave Ethernet optical port through the optical distributor; in the upstream direction (from the Ethernet optical port to the main Ethernet optical port), the passive fiber optic distribution network aggregates the business carried on the multiple branch optical fibers to the trunk optical fiber through the optical distributor.

[0057] Working principle:

[0058] After the system is deployed, the slave Ethernet optical port will declare to the master Ethernet optical port to join the system network in a specific time slot and obtain authentication and address information.

[0059] In the downstream direction (from the main Ethernet optical port to the slave Ethernet optical port), the main Ethernet optical port broadcasts the downstream data to the slave Ethernet optical ports in multiple existing systems through the optical distributor; in the upstream direction (from the slave Ethernet optical port to the main Ethernet optical port), the main Ethernet optical port allocates the time slots through the built-in main Ethernet optical port control unit.

[0060] The fixed total transmission time is divided into slices, and this time slice corresponds to the uplink transmission time slot corresponding to each slave Ethernet optical port. The master Ethernet optical port uses the OAM PDU message to send the release time slot number and the synchronous broadcast timestamp of each connected slave Ethernet optical port to the slave Ethernet optical port. After receiving the synchronous broadcast timestamp and the release time slot number, the slave Ethernet optical port sends the uplink message in the corresponding time slot received.

[0061] In a specific time slice, multiple slave Ethernet optical ports with different address information send data in turn in the specified time slot, thereby realizing the time division multiple access (TDMA) transmission method.

[0062] The specific method of allocating time slots is as follows:

[0063] 1) Time division multiple access (TDMA) is used. Each slave Ethernet optical port is evenly divided into time slots within the time slice for transmission from the Ethernet optical port to the main Ethernet optical port. When the slave Ethernet optical port receives an OAM PDU message as a transmission time slot operation code, the corresponding transmission time slot offset is calculated. The time slot offset is the product of the slave Ethernet optical port ID number and the time slice. The time slice allocation mechanism includes the on / off time of the slave Ethernet optical module laser, gain adjustment, and clock recovery time. The specific time is required to be within 1us.

[0064] 2) When the time slot length changes, when someone joins or leaves the system from the Ethernet optical port, the allocated transmission time slot will be recalculated to ensure that the bandwidth can keep up with the changes in the system;

[0065] 3) The slave Ethernet optical port can report the cache occupancy rate through the OAM PDU message operation code from the Ethernet optical port to the main Ethernet optical port according to the cache occupancy rate. The main Ethernet optical port can adjust the number of time slices sent from the Ethernet optical port to the main Ethernet optical port according to the reported situation.

[0066] When someone joins or leaves the system from the Ethernet optical port, the flow chart is as follows Figure 4 As shown,

[0067] The method for joining the system from an Ethernet optical port is as follows: the main Ethernet optical port adds a silent operation code, the one that has joined is not sent, and the one that has not joined immediately sends a join request after a random delay, and the join request is sent from the Ethernet optical port to the main Ethernet optical port. The main Ethernet optical port confirms the join request and assigns the slave Ethernet optical port ID number, and initializes the time counter synchronization at the same time. The OAM link between the slave Ethernet optical port and the main Ethernet optical port is activated with a period of 1us, and the main Ethernet optical port uses the OAMPDU message to send the release time slot number and the synchronous broadcast timestamp of the joined slave Ethernet optical port to the slave Ethernet optical port in the downstream. The principle of leaving the system from the Ethernet optical port is the same as above, and it can be selected to send a leave request to the main Ethernet optical port.

[0068] It should be noted that:

[0069] 1) The master Ethernet optical port and the slave Ethernet optical port of the present invention are both Ethernet ports on the switching chip, and the master Ethernet optical port physical unit and the slave Ethernet optical port physical unit are both ordinary Ethernet optical ports, which are respectively connected to the master Ethernet optical module and the slave Ethernet optical module (which may also support burst transmission of optical modules);

[0070] 2) The Ethernet MAC module 1 of the master Ethernet optical port and the Ethernet MAC module 2 of the slave Ethernet optical port are forced to be in link state, so as to prevent the LOS state of the physical unit layer of the master Ethernet optical port and the physical unit layer of the slave Ethernet optical port from affecting data transmission and reception, causing system packet loss;

[0071] 3) The total transmission time slice of the present invention is defined as 512us, which reduces the requirements for timing accuracy and scheduler processing, and the minimum transmission slice time is 8us;

[0072] 4) OAM PDU message definition. The system uses the custom extended message of the custom OAM PDU in the OAM defined by EFM to carry the scheduling message. The present invention needs to support the fast sending of unicast and multicast messages in the main Ethernet management entity for the originally defined slow multicast message, where the unicast message is the address of the slave Ethernet optical port management entity that needs to be managed. The frame format of the OAMPDU message is as follows: Figure 2 , where code is 0xFE, it indicates the organization's customized OAM definition. To implement the scheduling of the sending time, the following customized OAM message format is defined, such as Figure 3 .

[0073] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism, characterized by: include: Main Ethernet optical port, including The main Ethernet optical port control unit is used to complete the timeslot slicing calculation, the generation, reception and sending of OAM PDU messages, and the management and control of the main Ethernet optical port physical unit. The main Ethernet optical port physical unit is used to complete Ethernet data transmission and reception; At least one slave Ethernet optical port, including The slave Ethernet optical port control unit is used to complete the transmission time slot control of the slave Ethernet optical port and the sending and receiving processing of OAM PDU messages. From the Ethernet optical port physical unit, it is used to complete Ethernet data transmission and reception; a passive optical fiber distribution network for enabling communication between a master Ethernet optical port and at least one slave Ethernet optical port; Each slave Ethernet optical port equally divides the time slot in the time slot for transmission from the Ethernet optical port to the master Ethernet optical port. When the slave Ethernet optical port receives an OAM PDU message as a send time slot operation code, it calculates the corresponding send time slot offset, which is the product of the slave Ethernet optical port ID and the time slot. The time slot allocation mechanism includes the on / off time of the slave Ethernet optical module laser, gain adjustment, and clock recovery time; When someone joins or leaves the system from the Ethernet optical port, the allocated transmission time slot will be recalculated to ensure that the bandwidth can keep up with the changes in the system; The slave Ethernet optical port can report the cache occupancy rate through the OAMPDU message operation code from the Ethernet optical port to the master Ethernet optical port according to the cache occupancy rate. The master Ethernet optical port can adjust the number of time slices sent from the Ethernet optical port to the master Ethernet optical port according to the reported situation.

2. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 1, characterized in that: The main Ethernet optical port control unit includes OAM PDU transceiver processing module 1, used to complete the reception, parsing and encapsulation and transmission of OAM management messages, wherein the OAM management messages include the number, authentication and scheduling policy information of the Ethernet optical port; The scheduling management control module 1 is used to receive the OAM management message sent by the OAM PDU transceiver processing module 1 after parsing, and send the OAM management message to the time slot fragmentation management module, and receive the time slot fragmentation data of the time slot fragmentation management module, submit it to the Ethernet MAC module 1 of the main Ethernet optical port sent by the OAM PDU transceiver processing module 1, and then forward it to all slave Ethernet optical ports, and at the same time, manage the physical unit of the main Ethernet optical port; The time slot fragmentation management module is used to receive the OAM management message sent from the scheduling management control module 1, generate corresponding time slot fragmentation data according to the preset scheduling rules, and transmit it back to the scheduling management control module 1.

3. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 2, characterized in that: The main Ethernet optical port physical unit includes The main Ethernet optical module is connected to the passive optical fiber distribution network and is used for sending and receiving Ethernet data; The Ethernet MAC module 1 is used to complete the sending and receiving of OAM management messages, wherein the OAM management messages include OAM protocol messages OAMu and OAM protocol messages OAMd. The management configuration of the Ethernet data is executed by the scheduling management control module 1.

4. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 2, characterized in that: The OAM PDU transceiver processing module 1 completes the reception, parsing and encapsulation of the OAM management message as follows: From the Ethernet optical port to the main Ethernet optical port, the OAM PDU transceiver processing module 1 receives and parses the OAM protocol message OAMu sent from the Ethernet optical port, and then sends the parsed protocol message data to the scheduling management control module 1; In the direction from the main Ethernet optical port to the slave Ethernet optical port, the time slot management data from the scheduling management control module 1 is encapsulated into the OAM protocol message OAMd from the main Ethernet optical port to the slave Ethernet optical port, inserted into the Ethernet MAC module 1 of the main Ethernet optical port, and then forwarded to all slave Ethernet optical ports.

5. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 1, characterized in that: The slave Ethernet optical port control unit includes OAM PDU transceiver processing module 2, used to complete the reception, analysis and encapsulation and transmission of OAM management messages; The scheduling management control module 2 is used to receive the management protocol sent after parsing from the OAM PDU transceiver processing module 2, and send the management protocol to the optical module control module to manage the slave Ethernet optical port physical unit, wherein the management protocol includes the time slot fragmentation data information sent by the master Ethernet optical port; The optical module control module is used to receive the time slot fragmentation data sent from the scheduling management control module 2, parse the data, complete the system timestamp synchronization, and then control the transmission from the Ethernet optical module according to the time slot fragmentation data information.

6. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 5, characterized in that: The slave Ethernet optical port physical unit includes A slave Ethernet optical module is connected to the passive optical fiber distribution network and is used for transmitting and receiving Ethernet data. The optical module control module turns on and off the slave Ethernet optical module in a specific time slot; The Ethernet MAC module 2 is used to complete the sending and receiving of OAM management messages. The management configuration of the OAM management messages is executed by the scheduling management control module 2.

7. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 5, characterized in that: The OAM PDU transceiver processing module 2 completes the reception, parsing and encapsulation of the OAM management message as follows: In the direction from the main Ethernet optical port to the slave Ethernet optical port, the OAM PDU transceiver processing module 2 receives the OAM protocol message OAMd sent by the main Ethernet optical port and parses it, and then sends the parsed protocol message data to the scheduling management control module 2; From the Ethernet optical port to the main Ethernet optical port, the Ethernet data from the scheduling management control module 2 is encapsulated into the OAM protocol message OAMu from the Ethernet optical port to the main Ethernet optical port, inserted into the Ethernet MAC module 2 of the slave Ethernet optical port, and then forwarded to the main Ethernet optical port.

8. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 1, characterized in that: The passive optical fiber distribution network includes a trunk optical fiber, an optical distributor and a plurality of branch optical fibers. In the direction from the main Ethernet optical port to the slave Ethernet optical port, the passive optical fiber distribution network distributes the services of the main Ethernet optical port carried by the trunk optical fiber from the trunk optical fiber to multiple branch optical fibers connected to the slave Ethernet optical port through the optical distributor; From the Ethernet optical port to the main Ethernet optical port, the passive optical fiber distribution network aggregates the services carried on multiple branch optical fibers onto the trunk optical fiber through an optical distributor.

9. The shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism according to claim 8, characterized in that: The OAM PDU transceiver processing module 1 and the OAM PDU transceiver processing module 2 both utilize the EFM OAM extended information field to implement access control, bandwidth control and transmission time slot allocation of the master Ethernet optical port and the slave Ethernet optical port.

10. A working method of a shared point-to-multipoint Ethernet transmission system based on TDMA transmission mechanism as claimed in claim 9, characterized in that: The method comprises 1. In the direction from the master Ethernet optical port to the slave Ethernet optical port, the master Ethernet optical port broadcasts the downlink data to the slave Ethernet optical ports in multiple existing systems through the optical distributor; in the direction from the slave Ethernet optical port to the master Ethernet optical port, the master Ethernet optical port allocates the time slots through the built-in master Ethernet optical port control unit. Second, the fixed total transmission time is sliced. This time slice corresponds to the transmission time slot from each slave Ethernet optical port to the master Ethernet optical port. The master Ethernet optical port uses the OAM PDU message to send the release time slot number and the synchronous broadcast timestamp of each connected slave Ethernet optical port to the slave Ethernet optical port. After receiving the synchronous broadcast timestamp and the release time slot number, the slave Ethernet optical port sends the uplink message in the corresponding time slot received.

3. In a specific time slice, multiple slave Ethernet optical ports with different address information take turns to send data in the specified time slot, thus realizing the time division multiple access transmission mode; The specific method of allocating the time slots is as follows: 1) Time division multiple access (TDMA) is used. Each slave Ethernet optical port is evenly divided into time slots within the time slice for transmission from the Ethernet optical port to the main Ethernet optical port. When the slave Ethernet optical port receives an OAM PDU message as a transmission time slot operation code, the corresponding transmission time slot offset is calculated. The time slot offset is the product of the slave Ethernet optical port ID number and the time slice. The time slice allocation mechanism includes the on / off time of the slave Ethernet optical module laser, gain adjustment, and clock recovery time. The specific time is required to be within 1us. 2) When the time slot length changes, when someone joins or leaves the system from the Ethernet optical port, the allocated transmission time slot will be recalculated to ensure that the bandwidth can keep up with the changes in the system; 3) The slave Ethernet optical port can report the cache occupancy rate through the OAMPDU message operation code from the Ethernet optical port to the main Ethernet optical port according to the cache occupancy rate. The main Ethernet optical port can adjust the number of time slices sent from the Ethernet optical port to the main Ethernet optical port according to the reported situation; Among them, the method of joining the system from the Ethernet optical port is: The main Ethernet optical port adds a silent operation code. The one that has joined is not sent. The one that has not joined sends a join request immediately after a random delay. The join request is sent from the Ethernet optical port to the main Ethernet optical port. The main Ethernet optical port confirms the join request and assigns the slave Ethernet optical port ID number. At the same time, the time counter synchronization is initialized. The OAM link between the slave Ethernet optical port and the main Ethernet optical port is activated with a period of 1s. The main Ethernet optical port uses the OAM PDU message to send the release time slot number and synchronization broadcast timestamp of the joined slave Ethernet optical port to the slave Ethernet optical port.

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