Optical network unit, service data transmission method and passive optical network system

Abstract

The invention provides an optical network unit, a service data transmission method and a passive optical network system, and relates to the technical field of optical communication. The optical network unit comprises a first MAC module, a second MAC module and a first optical module; the first optical module is used for receiving a first optical signal and a second optical signal from an optical line terminal, converting the first optical signal into a first electric signal, converting the second optical signal into a second electric signal, sending the first electric signal to the first MAC module and sending the second electric signal to the second MAC module; the first optical signal and the second optical signal are optical signals with different wavelengths; the first MAC module is used for converting the first electric signal into first service data; the second MAC module is used for converting the second electric signal into second service data; the first business data and the second business data belong to the same business. The optical network unit can be compatible with PON protocols of different generations, and the access capability is effectively improved.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of communication technologies, and in particular, to an optical network unit, a service data transmission method, and a passive optical network system. Background Art

[0002] With the development of modern society and the continuous iteration of communication services, the network needs to support higher transmission rates, lower transmission delays, and stronger connection capabilities. Optical transmission networks, with their characteristics such as high bandwidth, low cost, and high reliability, have gradually become the mainstream solution for modern communication. In particular, for newly built networks at the present stage, access networks represented by fiber to the home are being deployed on a large scale.

[0003] A passive optical network (PON) generally consists of an optical line termination (OLT) on the central office side, an optical network terminal (ONT) / optical network unit (ONU) on the user side, and an optical distribution network (ODN), and adopts a point-to-multipoint network structure. The ODN consists of single-mode optical fibers, optical splitters, optical connectors and other passive optical devices, providing an optical transmission medium for the physical connection between the OLT and the ONU.

[0004] At present, the large-scale deployed PON networks include two types: EPON (Ethernet passive optical network) and GPON (gigabit passive optical network). With the upgrade of network bandwidth, 10G EPON and 10G GPON (which can also be called XG-PON) are gradually increasing in scale. Taking GPON as an example, the downstream rate of the GPON system is 2.5 Gbps, and the upstream rate is 1.25 Gbps or 2.5 Gbps; the downstream rate of the XG-PON system is 10 Gbps, and the upstream rate is 2.5 Gbps; the downstream rate of the XGS-PON system is 10 Gbps, and the upstream rates are 2.5 Gbps and 10 Gbps. It can be seen that after upgrading from GPON to XG-PON or XGS-PON, the theoretical upstream and downstream rates of the PON system have been significantly improved. However, since the PON system needs to enable the forward error correction (FEC) function, that is, perform certain redundant encoding on the signal at the sending end and perform error detection on the service data according to the error correction code at the receiving end, sacrificing a certain bandwidth efficiency in exchange for reliability, the actual upstream and downstream rates of the PON system cannot reach the theoretical values, and the optical network unit on the user side cannot achieve the theoretical access bandwidth. Summary of the Invention

[0005] In a first aspect, an embodiment of the present application provides an optical network unit, including a first MAC module, a second MAC module, and a first optical module; the first optical module is configured to receive a first optical signal and a second optical signal from an optical line terminal, convert the first optical signal into a first electrical signal, convert the second optical signal into a second electrical signal, and send the first electrical signal to the first MAC module and the second electrical signal to the second MAC module; the first optical signal and the second optical signal are optical signals of different wavelengths; the first MAC module is configured to convert the first electrical signal into first service data; the second MAC module is configured to convert the second electrical signal into second service data; the first service data and the second service data belong to the same service.

[0006] In a possible implementation manner of the first aspect, the first MAC module is further configured to convert third service data into a third electrical signal; the second MAC module is further configured to convert fourth service data into a fourth electrical signal; the first optical module is further configured to receive the third electrical signal from the first MAC module and the fourth electrical signal from the second MAC module, convert the third electrical signal into a third optical signal, convert the fourth electrical signal into a fourth optical signal, and send the third optical signal and the fourth optical signal to the optical line terminal; the third service data and the fourth service data belong to the same service.

[0007] In a possible implementation of the first aspect, the optical network unit further includes a third MAC module and a second optical module; the third MAC module is configured to receive first service data from the first MAC module and second service data from the second MAC module, convert the first service data and the second service data into a fifth electrical signal, and send the fifth electrical signal to the second optical module, and the second optical module is configured to convert the fifth electrical signal into a fifth optical signal and send the fifth optical signal to a downstream device.

[0008] In a possible implementation of the first aspect, the optical network unit includes a system-on-chip, and both the first MAC module and the second MAC module are built in the system-on-chip.

[0009] In a possible implementation of the first aspect, the optical network unit includes a system-on-chip, the first MAC module is built in the system-on-chip, and the second MAC module is an independent second MAC chip.

[0010] In a possible implementation of the first aspect, the first service data and the second service data are carried on a first channel and a second channel in a load sharing manner, the first channel is a channel for transmitting a first optical signal, and the second channel is a channel for transmitting a second optical signal.

[0011] In a possible implementation of the first aspect, both the third service data and the fourth service data belong to first upstream service data, and the optical network unit shunts the first upstream service data into the third service data and the fourth service data in a load sharing manner, sends the third service data to the first MAC module, and sends the fourth service data to the second MAC module.

[0012] In a possible implementation of the first aspect, the weights for shunting the first upstream service data into the third service data and the fourth service data are the ratio of the upstream rates of the third optical signal and the fourth optical signal.

[0013] In a second aspect, an embodiment of the present application provides a service data transmission method, including:

[0014] Receiving a first optical signal and a second optical signal from an optical line terminal through a first optical module, converting the first optical signal into a first electrical signal, converting the second optical signal into a second electrical signal, and transmitting the first electrical signal to a first MAC module and transmitting the second electrical signal to a second MAC module; the first optical signal and the second optical signal are optical signals of different wavelengths; converting the first electrical signal into first service data through the first MAC module; converting the second electrical signal into second service data through the second MAC module; wherein, the first service data and the second service data belong to the same service.

[0015] In a possible implementation of the second aspect, the service data transmission method further includes: converting the third service data into a third electrical signal through the first MAC module; converting the fourth service data into a fourth electrical signal through the second MAC module; receiving the third electrical signal from the first MAC module and the fourth electrical signal from the second MAC module through the first optical module, converting the third electrical signal into a third optical signal, converting the fourth electrical signal into a fourth optical signal, and sending the third optical signal and the fourth optical signal to an optical line terminal; wherein, the third service data and the fourth service data belong to the same service.

[0016] In a possible implementation of the second aspect, the service data transmission method further includes: receiving the first service data from the first MAC module and the second service data from the second MAC module through the third MAC module, converting the first service data and the second service data into a fifth electrical signal, and sending the fifth electrical signal to the second optical module; converting the fifth electrical signal into a fifth optical signal through the second optical module and sending the fifth optical signal to a downstream device.

[0017] In a possible implementation of the second aspect, both the third service data and the fourth service data belong to the first uplink service data, and the service data transmission method further includes: splitting the first uplink service data into the third service data and the fourth service data in a load sharing manner, sending the third service data to the first MAC module, and sending the fourth service data to the second MAC module.

[0018] In a possible implementation of the second aspect, the ratio of splitting the first uplink service data into the third service data and the fourth service data is the ratio of the uplink rates of the third optical signal and the fourth optical signal.

[0019] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, in which instructions are stored, and when they run on a computer, the computer is made to execute the methods in the above second aspect and third aspect.

[0020] In a fourth aspect, an embodiment of the present application provides a passive optical network system, including the optical network unit, the optical line terminal, and the optical distribution network described in the first aspect or any one of the possible implementations in the first aspect, and the optical network unit is connected to the optical line terminal through the optical distribution network.

[0021] The optical network unit and the service data transmission method provided by the embodiments of the present application can support the transceiver of optical signals of different generations of PON systems in one optical network unit, split and transmit service data through a load sharing method, provide a larger access bandwidth, save the installation quantity of optical network units, reduce the construction cost of the PON network, and moreover, there is no need to upgrade to support a PON protocol with a higher single-wavelength rate, and the deployment is relatively simple. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the architecture of a passive optical network system;

[0023] Figure 2 is a schematic diagram of the structure of a single-wavelength optical network unit;

[0024] Figure 3 is a schematic diagram of the structure of an optical network unit provided by an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of the structure of another optical network unit provided by an embodiment of the present application;

[0026] Figure 5 is a schematic diagram of the architecture of an FTTR network;

[0027] Figure 6 is a schematic diagram of the structure of yet another optical network unit provided by an embodiment of the present application;

[0028] Figure 7 is a schematic diagram of the structure of yet another optical network unit provided by an embodiment of the present application;

[0029] Figure 8 is a schematic diagram of a method for authenticating an optical network unit provided by an embodiment of the present application;

[0030] Figure 9 is a schematic diagram of the architecture of a passive optical network system provided by an embodiment of the present application. Detailed Description of the Embodiments

[0031] Reference will now be made in detail to various embodiments of the present application and examples shown in the drawings. Although the description will be made in conjunction with these embodiments, it is understood that they are not intended to limit the present invention to these embodiments. On the contrary, the present application disclosure is intended to cover alternatives, modifications, and equivalents that may be included within the spirit and scope of the present invention as defined by the appended claims. Additionally, in the following detailed description of the present application, many specific details are set forth in order to provide a thorough understanding of the present invention. It is understood that in actual applications, these specific details of the present application may not be included. In other embodiments, well-known methods, procedures, components, and circuits are not described in detail so as not to unnecessarily obscure various aspects of the present application.

[0032] Please refer to Figure 1 , Figure 1It is a schematic diagram of the architecture of a PON system. The PON system, i.e., the passive optical network system, usually includes an optical line terminal OLT on the central office side, an optical network terminal ONT / optical network unit ONU on the user side, and an optical distribution network ODN, adopting a point-to-multipoint network structure. The optical line terminal OLT is connected to the service node through the network side interface (service node interface, SNI) in the upstream direction and to the optical network unit ONU through the optical distribution network ODN in the downstream direction. The optical distribution network ODN includes passive optical devices such as single-mode optical fibers, optical splitters, and optical connectors, providing an optical transmission medium for the physical connection between the optical line terminal OLT and the optical network unit ONU. The optical network unit ONU is connected to the optical line terminal OLT in the upstream direction and provides a user side interface (user network interface, UNI) in the downstream direction. Generally speaking, the difference between the optical network terminal ONT and the optical network unit ONU is that the ONT directly provides the user side interface, while there may be other networks between the ONU and the user. The optical network unit described in the following embodiments can be directly connected to the user equipment, actually covering the concept of the ONT.

[0033] PON systems generally use different uplink and downlink wavelengths and utilize wavelength division multiplexing (WDM) technology to achieve single-fiber bidirectional transmission. ITU-T G.984 series defines GPON systems, ITU-T G.987 series defines XG-PON systems, and ITU-T G.9807 series defines XGS-PON systems. The wavelength used by the GPON system in the downstream direction is 1480 - 1500 nm, and the wavelength used in the upstream direction is 1300 - 1320 nm; the wavelength used by the XG-PON / XGS-PON system in the downstream direction is 1575 - 1580 nm, and the wavelength used in the upstream direction is 1260 - 1280 nm. The downstream rate of the GPON system is 2.5 Gbps, and the upstream rate is 1.25 Gbps or 2.5 Gbps; the downstream rate of the XG-PON system is 10 Gbps, and the upstream rate is 2.5 Gbps; the downstream rate of the XGS-PON system is 10 Gbps, and the upstream rates are 2.5 Gbps and 10 Gbps. Since functions such as forward error correction (FEC) need to be enabled in actual applications, additional bandwidth overhead will be generated, and the actual uplink and downlink rates of the PON system cannot reach the corresponding theoretical values. For example, for the XG-PON optical network unit, when the forward error correction function is enabled in the downstream direction, the actual maximum available downstream bandwidth does not exceed 8.7 Gbps. At this time, the optical network unit on the user side cannot achieve the theoretical bandwidth access capability.

[0034] Please refer to Figure 2 , Figure 2It is a schematic structural diagram of a conventional single-wavelength optical network unit. The main hardware includes: an optical module / optical transceiver component on board (bi-directional optical sub-assembly on board, BOB), a PON system on a chip (PON SOC), and a WIFI chip. The optical module / BOB has the ability of optical-electric conversion, which is used to complete the conversion between optical signals and electrical signals, convert the downstream optical signal into an electrical signal and send it to the MAC module, and vice versa, convert the upstream electrical signal into an optical signal and send it to the optical line terminal OLT. The optical module and the BOB are different packaging methods of the optical transceiver component. The PON system chip includes three modules: a central processing unit (CPU), a Media Access Control (MAC) module, and a service processing module. The central processing unit CPU is a software working unit that processes and controls instructions. The MAC module provides the conversion between PON protocol data and Ethernet protocol data. The service processing module can adopt the architecture of a network processor (NP) combined with a traffic manager (TM), or the architecture of a local area network switch (LAN switch, LSW) to complete functions such as data packet processing and traffic management. The WIFI chip provides the conversion between Ethernet protocol data and WIFI protocol data and provides WIFI access externally. In addition, the optical network unit also includes conventional storage modules FLASH and RAM, which are used to store non-volatile data and temporary data respectively. The optical network unit interacts with the optical line terminal OLT in the upstream direction, provides Ethernet access and WIFI access in the downstream direction, and interacts with terminal devices or downstream gateways.

[0035] Currently, with the intelligence and diversification of access service scenarios, the user side has higher and higher requirements for access bandwidth. Without increasing the number of deployed optical network units, it is necessary to provide a single optical network unit with a larger access bandwidth. In the conventional technical solutions, the PON protocol of the existing optical network unit is upgraded to provide a PON system that supports a higher single-wave rate. For example, to achieve the 10Gbps access capability of the optical network unit, a 50G PON optical network unit with a single-wave rate of 50Gbps is provided. This approach has a high cost, and usually a PON system with a higher single-wave rate may not be commercially deployable in the short term. In order to achieve a higher access bandwidth for a single optical network unit, while being compatible with the existing deployed PON system and saving the construction cost of the system, the embodiments of this application provide an optical network unit that is compatible with different generations of PON protocols in the same optical network unit and achieves a higher access capability through the sharing of traffic loads.

[0036] Those skilled in the art can understand that the present application does not limit to specific generation standards. What can be integrated in the optical network unit can be at least two of GPON, XG(S)-PON, 25G GPON, 50G GPON, EPON, 10G EPON, 25G EPON, 50G EPON and other generation PON systems that may appear in the future. For the convenience of description, the following embodiments will introduce the technical solutions of the present application by taking the optical network unit integrated with GPON and XGS-PON as an example. The optical network unit described herein can also be called a combined optical network unit (ComboONU) because it integrates two generation PON protocols, GPON and XGS-PON, at the same time.

[0037] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of an optical network unit provided in Embodiment 1 of the present application. The main hardware of the optical network unit includes: a GPON MAC chip, an XGS-PON system chip, an optical module / BOB, and a WIFI chip. The XGS-PON system chip further includes an XGS-PON MAC module, a central processing unit CPU, and a service processing module (the service processing module can adopt an NP+TM architecture or an LSW architecture). The connection interfaces between the modules are as follows: the GPON MAC chip is connected to the XGS-PON system chip through a 10GE / 5GE / 2.5GE / GE electrical interface, the WIFI chip is connected to the XGS-PON system chip through a 10GE / 5GE / 2.5GE / GE electrical interface, and the optical module / BOB is connected to the GPON MAC chip and the XGS-PON system chip through the differential receiving ports of the serial / parallel and parallel / serial converter interfaces SerDes.

[0038] In this optical network unit, the optical module / BOB realizes the bi-directional conversion between optical signals and electrical signals. The GPON MAC chip completes the bi-directional conversion between GPON protocol data and Ethernet protocol data. The XGS-PON MAC module on the XGS-PON system chip completes the bi-directional conversion between XGS-PON protocol data and Ethernet protocol data. Specifically, in the downstream direction, two-wavelength optical signals sent by the optical line terminal OLT at the central office enter the optical module / BOB through the optical fiber, namely, the 10G (XGS-PON) optical signal with a wavelength of 1575 - 1580 nm and the 2.5G (GPON) optical signal with a wavelength of 1480 - 1500 nm. The optical module / BOB converts the two-wavelength optical signals into electrical signals and then sends them to the GPON MAC chip and the XGS-PON MAC module on the XGS-PON system chip respectively. The GPON MAC chip converts GPON protocol data into Ethernet protocol data, and the XGS-PON MAC module converts XGS-PON protocol data into Ethernet protocol data. The converted Ethernet protocol data is transmitted downstream through the 10GE / GE optical / electrical Ethernet interface, or the Ethernet protocol data is converted into WIFI protocol data through the WIFI chip to provide WIFI access for the user-side device. Conversely, in the upstream direction, the service data from the user side enters the optical network unit through Ethernet access or WIFI access, and then enters the GPON MAC chip and the XGS-PON MAC module on the XGS-PON system chip respectively, and is converted into the corresponding GPON protocol data and XGS-PON protocol data, and then enters the optical module / BOB in the form of electrical signals, and is converted into optical signals in the optical module / BOB for upstream transmission.

[0039] Those skilled in the art can understand that the XGS-PON system chip and the GPON MAC chip are only logically divided. In terms of physical form, they can be two different chips, or two MAC modules can be integrated on one chip. In some examples, there are two different chips, namely the XGS-PON system chip and the GPON MAC chip, or the XGS-PON MAC chip and the GPON system chip, in the optical network unit. In other examples, both the GPON MAC and the XGS-PON MAC are integrated on the system chip at the same time. At this time, the optical network unit can support the conversion between GPON and XGS-PON protocol data and Ethernet protocol data through one chip.

[0040] Please refer to Figure 3Schematic diagram of the structure of the optical module. In Embodiment 1 of the present application, the optical module 320 in the optical network unit is a dual-transmit and dual-receive optical module, including two transmit units and two receive units. The optical module 320 is connected to the optical fiber 310, and the optical fiber 310 is a single-fiber bidirectional transmission, and two different optical signals, GPON and XGS-PON, are transmitted in each of the upstream and downstream directions. The transmit unit is used to transmit optical signals and includes a hardware driver (DRV) and a directly modulated laser (DML). The receive unit is used to receive optical signals and includes a photodetector (APD) and a transimpedance amplifier (TIA). In Embodiment 1 of the present application, the first transmit unit 322 transmits an XGS-PON optical signal of 1260 - 1280 nm, and the second transmit unit 324 transmits a GPON optical signal of 1300 - 1320 nm; the first receive unit 321 receives an XGS-PON optical signal of 1575 - 1580 nm, and the second receive unit 323 receives a GPON optical signal of 1480 - 1500 nm.

[0041] The optical network unit provided in Embodiment 1 of the present application integrates the capabilities of GPON and XGS-PON and is regarded as an optical network unit on the optical line terminal OLT at the central office. At this time, the actual total upstream bandwidth that can be obtained is the sum of the GPON upstream bandwidth of 1.25 Gbps and the XGS-PON upstream bandwidth of 8.7 Gbps, which is 9.95 Gbps; the actual total downstream bandwidth is the sum of the GPON downstream bandwidth of 2.5 Gbps and the XGS-PON downstream bandwidth of 8.7 Gbps, which is 11.2 Gbps.

[0042] Please refer to Figure 4 , Figure 4 which is a schematic diagram of the structure of an optical network unit provided in Embodiment 2 of the present application. This optical network unit is compatible with both GPON and XGS-PON modes in the downstream direction and enables the XGS-PON mode in the upstream direction. In terms of structure and function, the difference from the optical network unit in Embodiment 1 of the present application lies in the settings of the optical module / BOB and the GPON MAC chip, and the other modules remain unchanged and will not be elaborated below.

[0043] Specifically, the GPON MAC chip in Embodiment 2 of the present application is a GPON DMAC (Downstream MAC) chip, which provides the conversion between downstream GPON protocol data and Ethernet protocol data and sends the converted data to the XGS-PON system chip. In terms of the setting of functional units, this chip may not include an upstream data processing unit.

[0044] Please refer to Figure 4Schematic diagram of the structure of the optical module. In the second embodiment of the present application, the optical module 420 in the optical network unit is a one-transmission and two-reception optical module, which is connected to the optical fiber 410 and includes a first receiving unit 421, a second receiving unit 423, and a first transmitting unit 422. The first receiving unit 421 receives XGS-PON optical signals of 1575-1580 nm, and the second receiving unit 423 receives GPON optical signals of 1480-1500 nm; the first transmitting unit 422 transmits XGS-PON optical signals of 1260-1280 nm.

[0045] Specifically, in the optical network unit provided in the second embodiment of the present application, the connection interfaces between modules are as follows: The GPON DMAC chip is connected to the XGS-PON system chip through a 10GE / 5GE / 2.5GE / GE electrical interface, the WIFI chip is connected to the XGS-PON system chip through a 10GE / 5GE / 2.5GE / GE electrical interface, and the optical module / BOB is connected to the GPON DMAC chip and the XGS-PON system chip through the differential receiving port of the serializer / deserializer interface SerDes. Among them, the optical module / BOB is connected to the downstream interface of the GPON DMAC between the optical module / BOB and the GPON DMAC chip.

[0046] In the second embodiment of the present application, in a single optical network unit, it is downward compatible with both GPON and XGS-PON modes, and provides the XGS-PON mode for the upstream. This optical network unit is regarded as an optical network unit on the optical line terminal at the central office end. At this time, the actual total upstream bandwidth that can be obtained is the XGS-PON upstream bandwidth of 8.7 Gbps; the actual total downstream bandwidth is the sum of the GPON downstream bandwidth of 2.5 Gbps and the XGS-PON downstream bandwidth of 8.7 Gbps, which is 11.2 Gbps.

[0047] The optical network unit in the embodiment of the present application can be applied to the application scenario of FTTR (Fiber to the Room). By extending the optical fiber from "to the household" to "to the room", high-quality networks can be extended to every corner of the room, effectively improving the user experience. Please refer to Figure 5 , Figure 5 for the schematic diagram of the FTTR networking architecture. In the FTTR networking, the optical network unit ONU is divided into a main ONU (or main gateway) and a slave ONU (or slave gateway) according to its location; the main ONU is connected to the optical line terminal OLT through an upstream optical interface and provides a downstream optical interface to connect to at least one slave ONU; the slave ONU is connected to the main ONU upstream and establishes a WiFi connection with the user equipment downstream to transmit service data.

[0048] Please refer to Figure 6 , Figure 6FIG. 0 is a schematic structural diagram of an optical network unit provided in Embodiment 3 of the present application. This optical network unit can be used as the main gateway in the FTTR networking. In terms of structure and function, it is different from the optical network unit provided in Embodiment 1 in that an OLT MAC chip is added, and the other modules remain unchanged, which will not be elaborated below.

[0049] Specifically, the OLT MAC chip in the optical network unit of Embodiment 3 of the present application is used to complete the bidirectional conversion between Ethernet protocol data and PON protocol data. In the downstream direction, the OLT MAC chip converts Ethernet protocol data into PON (GPON or XGS-PON) protocol data and provides an optical module / BOB interface to the slave gateway; conversely, in the upstream direction, the OLT MAC chip converts PON (GPON or XGS-PON, etc.) protocol data into Ethernet protocol data and performs upstream transmission.

[0050] Specifically, in the setting of the module interface of the optical network unit provided in Embodiment 3 of the present application, the XGS-PON system chip is connected to the OLT MAC chip through a 10GE / 5GE / 2.5GE / GE electrical interface.

[0051] Please refer to Figure 7 , Figure 7 FIG. 13 is a schematic structural diagram of an optical network unit provided in Embodiment 4 of the present application. This optical network unit is compatible with both GPON and XGS-PON modes in the downstream direction and enables the XGS-PON mode in the upstream direction. In terms of structure and function, it is different from Embodiment 2 of the present application in that an OLT MAC chip is added, and the other modules remain unchanged, which will not be elaborated below.

[0052] Specifically, the OLT MAC chip in the optical network unit provided in Embodiment 4 of the present application is used to complete the bidirectional conversion between Ethernet protocol data and PON protocol data. In the downstream direction, the OLT MAC chip converts Ethernet protocol data into PON (GPON protocol or XGS-PON protocol, etc.) data and provides an optical module / BOB interface to the slave gateway; conversely, in the upstream direction, the OLT MAC chip converts PON protocol data into Ethernet protocol data and performs upstream transmission.

[0053] Specifically, in the setting of the module interface of the optical network unit provided in Embodiment 4 of the present application, the XGS-PON system chip is connected to the OLT MAC chip through a 10GE / 5GE / 2.5GE / GE electrical interface.

[0054] Please refer to Figure 8 , Figure 8Schematic diagram of the authentication method for the optical network unit provided in Embodiment 5 of this application. It should be noted that the optical network unit in the following method is the optical network unit in Embodiments 1 to 4 of this application. The GPON channel refers to the channel between the OLT and the GPON MAC chip (or the GPON module on the system chip) in the optical network unit. The XGS-PON channel refers to the channel between the OLT and the XGS-PON MAC module (or XGS-PON MAC chip) on the system chip in the optical network unit. Specifically, the optical network unit performs the following steps:

[0055] In the first step, the optical network unit goes online and authenticates on the XGS-PON channel. If the authentication is successful, it proceeds to the second step for service configuration; otherwise, it checks whether the PON port of the optical line terminal OLT has the automatic discovery function enabled. If the automatic discovery function is not enabled, the optical network unit goes online and authenticates again on the XGS-PON channel after the optical line terminal OLT enables automatic discovery. Otherwise, the authentication fails and the optical network unit goes offline.

[0056] Specifically, before the optical network unit goes online and authenticates, pre-configuration information of the optical network unit is added on the optical line terminal OLT, and the XGS-PON channel is specified as the management channel on the corresponding interface of the OLT. Then, the optical line terminal OLT opens a window and performs ranging on the optical network unit, which specifically includes: the optical line terminal OLT sends a ranging request to the optical network unit, the optical network unit responds to the ranging request of the optical line terminal OLT, and the optical line terminal OLT sets the compensation delay according to the received message.

[0057] Specifically, during the authentication process of the optical network unit, the optical network unit obtains the authentication information sent by the optical line terminal OLT through the XGS-PON channel and returns the authentication information to the optical line terminal OLT through the XGS-PON channel. The optical line terminal OLT searches for the pre-configuration information of the optical network unit and matches it with the received authentication information. If the match is successful, the optical network unit authentication is successful.

[0058] In the second step, the XGS-PON channel of the optical network unit receives the optical network unit management and control interface messages from the optical line terminal OLT and performs XGS-PON service configurations such as T-CONT and GEM port.

[0059] Among them, the ONU management and control interface (OMCI) is the interface for the optical line terminal OLT to manage and control the optical network unit. Through this interface, the optical line terminal OLT completes configuration management, performance management, and security management of the optical network unit, etc.

[0060] In the third step, the GPON channel of the optical network unit receives the optical network unit management control interface messages from the optical line terminal OLT. When the optical network unit is the optical network unit in Embodiments 1 and 3 of this application, that is, when it supports GPON channel upstream transmission, physical layer configuration of the GPON path ranging interface and GPON service configuration of T-CONT and the upstream and downstream GEM ports are performed; when the optical network unit is the optical network unit in Embodiments 2 and 4 of this application, that is, when it does not support GPON channel upstream transmission, GPON service configuration of the downstream GEM port is performed.

[0061] In the authentication method provided in Embodiment 5 of this application, the optical network unit goes online and is authenticated on the XGS-PON channel, using the XGS-PON channel as the management channel and the GPON channel as the data channel. Or, in some other embodiments, the optical network unit goes online and is authenticated on the GPON channel, using the GPON channel as the management channel and the XGS-PON channel as the data channel. Both methods can achieve single-channel online authentication, effectively simplifying the management measures.

[0062] Please refer to Figure 9 , Figure 9 FIG. is a PON system provided by an embodiment of this application. In this system, the combined optical line terminal Combo OLT is an optical line terminal compatible with GPON and XGS-PON modes, and the combined optical network unit Combo ONU is the optical network unit compatible with GPON and XGS-PON modes in Embodiments 1 to 4 of this application, supporting two data channels, namely the XGS-PON channel and the GPON channel. Among them, the GPON channel refers to the channel between the optical line terminal OLT and the GPON MAC chip (or the GPON MAC module on the system chip) in the optical network unit, and the XGS-PON channel refers to the channel between the optical line terminal OLT and the XGS-PON MAC module (or XGS-PON MAC chip) on the system chip in the optical network unit.

[0063] Embodiment 6 of this application provides a service data transmission method, which realizes the sharing of service data between the XGS-PON channel and the GPON channel.

[0064] In the upstream direction, the combined optical network unit Combo ONU can be the optical network unit that is compatible with both GPON and XGS-PON modes in both upstream and downstream directions in Embodiment 1 or 3 of this application, and perform the following steps:

[0065] In the first step, the optical network unit receives service data from the downstream device;

[0066] In the second step, the optical network unit obtains the current working states of the XGS-PON channel and the GPON channel, and selects the channel that is currently in a connected state to forward service data.

[0067] In the third step, the optical network unit forwards the service data to the selected channel or stops forwarding the service data.

[0068] Specifically, the connected state refers to the state in which the XGS-PON channel or the GPON channel can transmit signals normally, and it can be judged by whether there is light on the link between the optical network unit and the optical line terminal.

[0069] Specifically, if one of the XGS-PON channel and the GPON channel is in a connected state, select the connected channel to forward service data; if both channels are in a connected state, perform load sharing of service data between the two channels according to the routing algorithm; if neither of the two channels is in a connected state, stop forwarding the service data. Among them, the process of the optical network unit selecting the channel for forwarding upstream data according to the current working states of the XGS-PON channel and the GPON channel is controlled by the service processing module on the system chip.

[0070] Optionally, when both channels are in a connected state, use the ip-enhance routing algorithm to achieve load sharing between the XGS-PON channel and the GPON channel. For example, set the hash routing weights of the two channels to 4:1 according to the rates of the XGS-PON channel and the GPON channel, calculate the hash value for the upstream service data according to any combination of parameters in SMAC, DMAC, SIP, DIP, PROTOCOL, and L4Port, and forward the upstream service according to the ratio of 4:1 to the XGS-PON channel and the GPON channel respectively to achieve reasonable sharing of service traffic.

[0071] Among them, the specific meanings of the parameters in the routing algorithm are as follows:

[0072] SMAC: Source MAC address;

[0073] DMAC: Destination MAC address;

[0074] SIP: Source IP;

[0075] DIP: Destination IP;

[0076] PROTOCOL: Protocol type, such as TCP, UDP, etc.;

[0077] L4 PORT: Four-layer port number, referring to TCP port number, UDP port number, etc.

[0078] On the optical line terminal (OLT) side, since the dual-channel optical network unit occupies two GEM port resources, after the OLT receives the service data of the GPON channel and the XGS-PON channel, the service data of the two channels is mapped to the same service flow and then forwarded.

[0079] In the downstream direction, the combined optical network unit (Combo ONU) can be the optical network unit that is compatible with the GPON and XGS-PON modes in Embodiments 1 to 4 of the present application. The OLT performs load sharing on the unicast traffic of the GPON channel and the XGS-PON channel of the optical network unit; for unknown unicast, multicast, and broadcast traffic, it can select the XGS-PON channel or copy it to both channels simultaneously. At this time, the optical network unit cooperates to perform pruning processing, that is, it only accepts one copy of unknown unicast, multicast, and broadcast packets.

[0080] Optionally, the OLT uses the ip-enhance routing algorithm to achieve load sharing of unicast service traffic. The hash routing weights of the XGS-PON channel and the GPON channel are set to 4:1 according to the channel rate, and the hash value of the service data is calculated based on any combination of parameters in SMAC, DMAC, SIP, DIP, PROTOCOL, and L4Port. The downstream service is forwarded to the XGS-PON channel and the GPON channel of the optical network unit in a ratio of 4:1, realizing reasonable sharing of service traffic.

[0081] It should be noted that although the above disclosures use specific block diagrams, flowcharts, and examples to illustrate various embodiments, each block diagram component, flowchart step, operation, and / or component described and / or illustrated herein can be implemented individually and / or jointly by various hardware, software, or firmware (or any combination thereof) configurations. Additionally, the disclosure of any component included among other components should be regarded as an example, because many other architectures can be implemented to achieve the same function.

[0082] The process parameters and step sequences described and / or illustrated herein are only for example and can be changed as needed. For example, although the steps illustrated and / or described herein can be shown or discussed in a specific order, these steps do not necessarily have to be performed in the order shown or discussed. The various example methods described and / or illustrated herein can also omit one or more steps described and / or illustrated herein or can further include additional steps other than those disclosed.

[0083] Although the various embodiments have been described and / or illustrated herein in the context of a fully functional computing system, one or more of these example embodiments can be distributed in a variety of forms as a program product, regardless of the specific form of the computer-readable medium used to actually effect such distribution. The embodiments disclosed herein can also be implemented by using software modules that perform certain tasks. These software modules can include scripts, batch files, or other executable files, which can be stored on a computer-readable medium or within a computer system. These software modules can configure a computer system to perform one or more of the example embodiments disclosed herein. One or more of the software modules disclosed herein can be implemented in a cloud computing environment. A cloud computing environment can provide different services and applications over the Internet. These cloud-based services (e.g., software as a service, platform as a service, infrastructure as a service, etc.) can be accessed via a web browser or other remote interface. The various functions described herein can be provided via a remote desktop environment or any other cloud-based computing environment.

[0084] Although the invention has been described in detail with reference to its advantages, it should be understood that various changes, substitutions, and alterations can be made to the invention without departing from the spirit and scope of the invention as defined by the appended claims. Many modifications and variations are possible in light of the above teachings. The selected and described embodiments are intended to better explain the principles of the invention and its practical applications, thereby enabling those skilled in the art to better utilize the invention in various embodiments and the various changes suitable for the intended specific purposes.

[0085] Embodiments in accordance with the invention are described herein. Although the invention has been described in specific embodiments, it should be understood that the invention should not be construed as limited to these embodiments.

Claims

1. An optical network unit, characterized in that, It includes a first MAC module, a second MAC module, and a first optical module; The first optical module is configured to receive a first optical signal and a second optical signal from an optical line terminal, convert the first optical signal into a first electrical signal, convert the second optical signal into a second electrical signal, and send the first electrical signal to the first MAC module and the second electrical signal to the second MAC module; the first optical signal and the second optical signal are optical signals of different wavelengths; The first MAC module is configured to convert the first electrical signal into first service data; The second MAC module is configured to convert the second electrical signal into second service data; The first service data and the second service data belong to the same service.

2. The optical network unit according to claim 1, characterized in that The first MAC module is further configured to convert third service data into a third electrical signal; the second MAC module is further configured to convert fourth service data into a fourth electrical signal; the first optical module is further configured to receive the third electrical signal from the first MAC module and the fourth electrical signal from the second MAC module, convert the third electrical signal into a third optical signal, convert the fourth electrical signal into a fourth optical signal, and send the third optical signal and the fourth optical signal to the optical line terminal; The third service data and the fourth service data belong to the same service.

3. The optical network unit according to claim 1, wherein The optical network unit further includes a third MAC module and a second optical module; The third MAC module is configured to receive the first service data from the first MAC module and the second service data from the second MAC module, convert the first service data and the second service data into a fifth electrical signal, and send the fifth electrical signal to the second optical module, and the second optical module is configured to convert the fifth electrical signal into a fifth optical signal and send the fifth optical signal to a downstream device.

4. The optical network unit according to any one of claims 1 to 3, characterized in that, The optical network unit includes a system chip, and both the first MAC module and the second MAC module are built in the system chip.

5. The optical network unit according to any one of claims 1 to 3, characterized in that The optical network unit includes a system chip, the first MAC module is built in the system chip, and the second MAC module is an independent second MAC chip.

6. The optical network unit according to claim 1, wherein The first service data and the second service data are carried on a first channel and a second channel in a load sharing manner, the first channel is a channel for transmitting the first optical signal, and the second channel is a channel for transmitting the second optical signal.

7. The optical network unit according to claim 2, characterized in that, The third service data and the fourth service data both belong to first upstream service data, and the optical network unit shunts the first upstream service data into the third service data and the fourth service data in a load sharing manner.

8. The optical network unit according to claim 7, characterized in that, The ratio of the first upstream service data shunted into the third service data and the fourth service data is the ratio of the upstream rates of the third optical signal and the fourth optical signal.

9. A business data transmission method, characterized in that, The method includes: Receive a first optical signal and a second optical signal from an optical line terminal through a first optical module, convert the first optical signal into a first electrical signal, convert the second optical signal into a second electrical signal, and transmit the first electrical signal to a first MAC module and the second electrical signal to a second MAC module; the first optical signal and the second optical signal are optical signals of different wavelengths; Convert the first electrical signal into first service data through the first MAC module; Convert the second electrical signal into second service data through the second MAC module; The first service data and the second service data belong to the same service.

10. The method according to claim 9, wherein The method further includes: Convert third service data into a third electrical signal through the first MAC module; Convert fourth service data into a fourth electrical signal through the second MAC module; Receive the third electrical signal from the first MAC module and the fourth electrical signal from the second MAC module through the first optical module, convert the third electrical signal into a third optical signal, convert the fourth electrical signal into a fourth optical signal, and transmit the third optical signal and the fourth optical signal to the optical line terminal; The third service data and the fourth service data belong to the same service.

11. The method according to claim 9, characterized in that, The method further includes: Receive the first service data from the first MAC module and the second service data from the second MAC module through a third MAC module, convert the first service data and the second service data into a fifth electrical signal, and transmit the fifth electrical signal to a second optical module; Convert the fifth electrical signal into a fifth optical signal through the second optical module and transmit the fifth optical signal to a downstream device.

12. The method according to claim 10, wherein The third service data and the fourth service data both belong to first upstream service data, and the method further includes: Shunt the first upstream service data into the third service data and the fourth service data in a load sharing manner, and transmit the third service data to the first MAC module and the fourth service data to the second MAC module.

13. The method according to claim 12, wherein The ratio of shunting the first upstream service data into the third service data and the fourth service data is the ratio of the upstream rates of the third optical signal and the fourth optical signal.

14. A computer-readable storage medium, characterized in that, Includes instructions that, when running on a computer, cause the computer to execute the method according to any one of claims 9-10.

15. A passive optical network system, characterized in that, Includes the optical network unit, optical line terminal, and optical distribution network according to any one of claims 1-8, and the optical network unit is connected to the optical line terminal through the optical distribution network.

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