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

Abstract

The present application relates to the technical field of optical communications and provides an optical network unit, a service data transmission method, and a passive optical network (PON) system. 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 of 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; and the first service data and the second service data belong to the same service. The optical network unit is compatible with PON protocols of different generations, thereby effectively improving the access capability.

Description

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

[0001] This application claims priority to Chinese patent application No. 202410009291.4 filed on January 3, 2024, entitled “An optical network unit, service data transmission method and passive optical network system”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The embodiments of the present application relate to the field of communication technology, and in particular to an optical network unit, a service data transmission method, and a passive optical network system. Background Art

[0003] With the development of modern society and the continuous iteration of communication services, networks need to support higher transmission rates, lower transmission latency, and stronger connectivity. Optical transmission networks, with their high bandwidth, low cost, and high reliability, are gradually becoming the mainstream solution for modern communications. This is especially true for newly built networks, and access networks, such as fiber-to-the-home, are being deployed on a large scale.

[0004] A passive optical network (PON) typically consists of 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), using a point-to-multipoint network architecture. The ODN, comprised of single-mode optical fiber and passive optical components such as optical splitters and optical connectors, provides the optical transmission medium for the physical connection between the OLT and ONU.

[0005] Currently, large-scale PON networks are being deployed, including EPON (Ethernet passive optical network) and GPON (gigabit passive optical network). With network bandwidth upgrades, 10G EPON and 10G GPON (also known as XG-PON) are gradually increasing in volume. Taking GPON as an example, the GPON system has a downlink rate of 2.5Gbps and an uplink rate of 1.25Gbps or 2.5Gbps; the XG-PON system has a downlink rate of 10Gbps and an uplink rate of 2.5Gbps; and the XGS-PON system has a downlink rate of 10Gbps and uplink rates of 2.5Gbps and 10Gbps. This shows that upgrading GPON to XG-PON or XGS-PON significantly improves both the theoretical downlink and uplink rates of the PON system. However, since the PON system needs to enable the forward error correction (FEC) function, that is, a certain amount of redundant encoding of the signal is performed on the sending end, and error detection of the service data is performed on the receiving end based on the error correction code, a certain amount of bandwidth efficiency needs to be sacrificed in exchange for reliability. Therefore, the actual downlink rate of the PON system cannot reach the theoretical value, and the optical network unit on the user side cannot achieve the theoretical access bandwidth. Summary of the Invention

[0006] In a first aspect, an embodiment of the present application provides an optical network unit, comprising a first MAC module, a second MAC module, and a first optical module;

[0007] The first optical module is used 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 a first MAC module and send the second electrical signal to a second MAC module; the first optical signal and the second optical signal are optical signals of different wavelengths; the first MAC module is used to convert the first electrical signal into first service data; the second MAC module is used to convert the second electrical signal into second service data; the first service data and the second service data belong to the same service.

[0008] In a possible implementation of the first aspect, the first MAC module is further used to convert the third business data into a third electrical signal; the second MAC module is further used to convert the fourth business data into a fourth electrical signal; the first optical module is further used to receive the third electrical signal from the first MAC module and the fourth electrical signal from the second MAC module, and 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 business data and the fourth business data belong to the same business.

[0009] In a possible implementation of the first aspect, the optical network unit also includes a third MAC module and a second optical module; the third MAC module is used to receive first service data from the first MAC module and second service data from the second MAC module, and 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 used to convert the fifth electrical signal into a fifth optical signal, and send the fifth optical signal to the downstream device.

[0010] In a possible implementation manner of the first aspect, the optical network unit includes a system chip, and the first MAC module and the second MAC module are both built into the system chip.

[0011] In a possible implementation of the first aspect, the optical network unit includes a system chip, the first MAC module is built into the system chip, and the second MAC module is an independent second MAC chip.

[0012] 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, where 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.

[0013] In a possible implementation of the first aspect, the third service data and the fourth service data both belong to the first uplink service data. The optical network unit diverts the first uplink service data into the third service data and the fourth service data through load sharing, and sends the third service data to the first MAC module and sends the fourth service data to the second MAC module.

[0014] In a possible implementation manner of the first aspect, a weight of splitting the first uplink service data into the third service data and the fourth service data is a ratio of uplink rates of the third optical signal to that of the fourth optical signal.

[0015] In a second aspect, an embodiment of the present application provides a service data transmission method, including:

[0016] A first optical signal and a second optical signal are received from an optical line terminal through a first optical module, and the first optical signal is converted into a first electrical signal, the second optical signal is converted into a second electrical signal, and the first electrical signal is transmitted to a first MAC module, and the second electrical signal is transmitted to a second MAC module; the first optical signal and the second optical signal are optical signals of different wavelengths; the first electrical signal is converted into first business data through the first MAC module; the second electrical signal is converted into second business data through the second MAC module; wherein the first business data and the second business data belong to the same business.

[0017] In a possible implementation of the second aspect, the service data transmission method also 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, and 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 the optical line terminal; wherein the third service data and the fourth service data belong to the same service.

[0018] In a possible implementation of the second aspect, the service data transmission method also includes: receiving first service data from the first MAC module and second service data from the second MAC module through a third MAC module, and 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 the downlink device.

[0019] In a possible implementation of the second aspect, the third business data and the fourth business data both belong to the first uplink business data, and the business data transmission method also includes: diverting the first uplink business data into the third business data and the fourth business data by load sharing, and sending the third business data to the first MAC module and sending the fourth business data to the second MAC module.

[0020] In a possible implementation manner 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 to the fourth optical signal.

[0021] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, which stores instructions. When the computer-readable storage medium is run on a computer, the computer executes the methods of the second and third aspects above.

[0022] In a fourth aspect, an embodiment of the present application provides a passive optical network system, comprising the optical network unit, optical line terminal and optical distribution network described in the first aspect or any possible implementation of the first aspect, wherein the optical network unit is connected to the optical line terminal through the optical distribution network.

[0023] The optical network unit and service data transmission method provided in the embodiments of the present application can support the transmission and reception of optical signals of different generations of PON systems in one optical network unit, and transmit service data by offloading the service data through a load sharing method, thereby providing a larger access bandwidth, saving the number of optical network units installed, and reducing the construction cost of the PON network. Moreover, there is no need to upgrade the PON protocol to support a higher single-wave rate, and the deployment is relatively simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic diagram of the architecture of a passive optical network system;

[0025] FIG2 is a schematic diagram of the structure of a single wavelength optical network unit;

[0026] FIG3 is a schematic structural diagram of an optical network unit provided in an embodiment of the present application;

[0027] FIG4 is a schematic diagram of the structure of another optical network unit provided in an embodiment of the present application;

[0028] Figure 5 is a schematic diagram of the architecture of FTTR networking;

[0029] FIG6 is a schematic structural diagram of another optical network unit provided in an embodiment of the present application;

[0030] FIG7 is a schematic structural diagram of another optical network unit provided in an embodiment of the present application;

[0031] FIG8 is a schematic diagram of an optical network unit authentication method provided in an embodiment of the present application;

[0032] FIG9 is a schematic diagram of the architecture of a passive optical network system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] Reference will now be made in detail to the various embodiments of the present application, the examples shown in the accompanying drawings. Although described in conjunction with these embodiments, it will be understood that they are not intended to limit the present application to these embodiments. On the contrary, the present application is intended to cover alternatives, modifications and equivalents that may be included within the spirit and scope of the present application as defined by the appended claims. In addition, 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 application. It will be understood that in actual applications, these specific details of the present application may not be included. In other embodiments, well-known methods, processes, components and circuits are not described in detail to avoid unnecessary ambiguity in various aspects of the present application.

[0034] Please refer to Figure 1, which is a schematic diagram of the architecture of a PON system. A PON system, or passive optical network system, typically 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 via a network-side interface (SNI) upstream, and is connected to the optical network unit (ONU) downstream via an optical distribution network (ODN). The optical distribution network (ODN) includes single-mode optical fiber and passive optical components such as optical splitters and optical connectors, providing optical transmission media 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) upstream and provides a user-side interface (UNI) downstream. Generally speaking, the difference between an optical network terminal (ONT) and an optical network unit (ONU) is that the ONT directly provides a 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, which actually covers the concept of the ONT.

[0035] PON systems generally use different upstream and downstream wavelengths, utilizing wavelength division multiplexing (WDM) technology to achieve bidirectional transmission over a single fiber. The ITU-T G.984 series defines the GPON system, the ITU-T G.987 series defines the XG-PON system, and the ITU-T G.9807 series defines the XGS-PON system. GPON systems use wavelengths of 1480-1500nm for downstream transmission and 1300-1320nm for upstream transmission. XG-PON / XGS-PON systems use wavelengths of 1575-1580nm for downstream transmission and 1260-1280nm for upstream transmission. The GPON system has a downlink rate of 2.5Gbps and an uplink rate of 1.25Gbps or 2.5Gbps; the XG-PON system has a downlink rate of 10Gbps and an uplink rate of 2.5Gbps; the XGS-PON system has a downlink rate of 10Gbps and an uplink rate of 2.5Gbps and 10Gbps. Since functions such as forward error correction (FEC) need to be enabled in actual applications, additional bandwidth overhead will be generated, and the actual downlink rate of the PON system cannot reach the corresponding theoretical value. For example, for the XG-PON optical network unit, when the forward error correction function is enabled in the downlink, the actual maximum available downlink bandwidth does not exceed 8.7Gbps. At this time, the optical network unit on the user side cannot achieve the theoretical bandwidth access capability.

[0036] Please refer to Figure 2, which is a schematic diagram of the structure of a conventional single-wavelength optical network unit. The main hardware includes: an optical module / bi-directional optical sub-assembly on board (BOB), a PON system on a chip (PON SOC), and a Wi-Fi chip. The optical module / BOB has photoelectric conversion capabilities and is used to convert optical and electrical signals. It converts downstream optical signals into electrical signals and sends them to the MAC module, and conversely converts upstream electrical signals into optical signals and sends them to the optical line terminal (OLT). The optical module and BOB are different packaging methods for optical transceiver components. 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 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 access network switch (LAN switch, LSW), to complete functions such as data packet processing and traffic management. The WIFI chip provides conversion between Ethernet protocol data and WIFI protocol data, and provides WIFI access to the outside world. 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 exchanges signals with the optical line terminal (OLT) in the upstream direction, provides Ethernet access and WIFI access in the downstream direction, and exchanges signals with terminal devices or downstream gateways.

[0037] At present, 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 optical network units deployed, it is necessary to provide a single optical network unit with a larger access bandwidth. In 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, in order 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 is costly, and PON systems with higher single-wave rates may not be commercially deployed 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, an embodiment of the present application provides an optical network unit that is compatible with PON protocols of different generations in the same optical network unit and achieves higher access capabilities by sharing the traffic load.

[0038] Those skilled in the art will understand that this application is not limited to a specific generation standard, and the optical network unit may integrate at least two of GPON, XG(S)-PON, 25G GPON, 50G GPON, EPON, 10G EPON, 25G EPON, 50G EPON, and other generations of PON systems that may appear in the future. For ease of explanation, the following embodiments all use an optical network unit integrating GPON and XGS-PON as an example to introduce the technical solution of this application. The optical network unit described therein may also be called a combined optical network unit (Combo ONU) because it integrates two generations of PON protocols, GPON and XGS-PON.

[0039] Please refer to Figure 3, which is a structural diagram of an optical network unit provided in Example 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, wherein 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 interface between the modules is: 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, the optical module / BOB and the GPON MAC chip, as well as the optical module / BOB and the XGS-PON system chip are connected through the differential receiving port of the serial-to-serial / serial-to-parallel converter interface SerDes.

[0040] In this optical network unit, the optical module / BOB realizes bidirectional conversion between optical signals and electrical signals, the GPON MAC chip completes bidirectional conversion between GPON protocol data and Ethernet protocol data, and the XGS-PON MAC module on the XGS-PON system chip completes bidirectional conversion between XGS-PON protocol data and Ethernet protocol data. Specifically, in the downstream direction, two wavelength optical signals sent from the optical line terminal OLT at the central office enter the optical module / BOB through the optical fiber. These are the 10G (XGS-PON) optical signal of 1575-1580nm and the 2.5G (GPON) optical signal of 1480-1500nm. The optical module / BOB converts the two wavelength optical signals into electrical signals, which are then sent 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 user-side devices. Conversely, in the upstream direction, 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. Then, it 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.

[0041] It will be understood by those skilled in the art that the XGS-PON system chip and the GPON MAC chip are only a logical division. In terms of physical form, they can be two different chips, or two MAC modules can be integrated on one chip. In some examples, the optical network unit has two different chips, the XGS-PON system chip and the GPON MAC chip, or two different chips, the XGS-PON MAC chip and the GPON system chip. In other examples, two MAC modules, GPON MAC and XGS-PON MAC, are integrated on the system chip at the same time. In this case, the optical network unit can support the conversion of two different PON protocol data, GPON and XGS-PON, and Ethernet protocol data through one chip.

[0042] Please refer to the structural diagram of the optical module in Figure 3. The optical module 320 in the optical network unit provided in Example 1 of the present application is a dual-transmit and dual-receive optical module, including two transmitting units and two receiving units. The optical module 320 is connected to the optical fiber 310. The optical fiber 310 is a single-fiber bidirectional transmission, and transmits two different optical signals, GPON and XGS-PON, in each of the upstream and downstream directions. The transmitting unit is used to send optical signals, including a hardware driver (DRV) and a directly modulated laser (DML). The receiving unit is used to receive optical signals, including a photodetector (APD) and a transimpedance amplifier (TIA). In Example 1 of the present application, the first transmitting unit 322 sends an XGS-PON optical signal of 1260-1280nm, and the second transmitting unit 324 sends a GPON optical signal of 1300-1320nm; the first receiving unit 321 receives an XGS-PON optical signal of 1575-1580nm, and the second receiving unit 323 receives a GPON optical signal of 1480-1500nm.

[0043] The optical network unit provided in Example 1 of this application integrates the capabilities of GPON and XGS-PON and is considered a single optical network unit at the central office optical line terminal (OLT). The actual total upstream bandwidth available is the sum of the GPON upstream bandwidth of 1.25 Gbps and the XGS-PON upstream bandwidth of 8.7 Gbps, totaling 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, totaling 11.2 Gbps.

[0044] Please refer to Figure 4, which is a schematic diagram of the structure of an optical network unit provided in Example 2 of this application. This optical network unit is compatible with both GPON and XGS-PON modes in the downstream direction, and operates in XGS-PON mode in the upstream direction. In terms of structure and function, the difference from the optical network unit in Example 1 of this application lies in the configuration of the optical module / BOB and GPON MAC chip. The remaining modules remain unchanged and will not be further described below.

[0045] Specifically, the GPON MAC chip in the second embodiment of the present application is a GPON DMAC (Downstream MAC) chip, which converts downstream GPON protocol data into Ethernet protocol data and sends the converted data to the XGS-PON system chip. In terms of the functional unit configuration, this chip may not include an uplink data processing unit.

[0046] Please refer to the structural schematic diagram of the optical module in Figure 4. The optical module 420 in the optical network unit provided in Example 2 of the present application is a one-transmitter, two-receiver optical module, connected to the optical fiber 410, and includes a first receiving unit 421, a second receiving unit 423 and a first sending unit 422. The first receiving unit 421 receives an XGS-PON optical signal of 1575-1580nm, and the second receiving unit 423 receives a GPON optical signal of 1480-1500nm; the first sending unit 422 sends an XGS-PON optical signal of 1260-1280nm.

[0047] Specifically, in the optical network unit provided in Example 2 of the present application, the connection interfaces between modules are as follows: the GPON DMAC chip is connected to the XGS-PON system chip via a 10GE / 5GE / 2.5GE / GE electrical interface, the WIFI chip is connected to the XGS-PON system chip via a 10GE / 5GE / 2.5GE / GE electrical interface, and the optical module / BOB and the GPON DMAC chip, as well as the optical module / BOB and the XGS-PON system chip, are connected via the differential receiving ports of the serial / serial-to-parallel converter interface SerDes. The optical module / BOB and the GPON DMAC chip are connected to the GPON DMAC downlink interface.

[0048] In the second embodiment of the present application, a single optical network unit (ONU) is compatible with both GPON and XGS-PON modes for downlink and XGS-PON mode for uplink. The ONU is treated as a single ONU at the central office optical line terminal (OLT). The actual total uplink bandwidth available is the XGS-PON uplink bandwidth of 8.7 Gbps; the actual total downlink bandwidth is the sum of the GPON downlink bandwidth of 2.5 Gbps and the XGS-PON downlink bandwidth of 8.7 Gbps, totaling 11.2 Gbps.

[0049] The optical network unit in the embodiment of the present application can be applied to FTTR (Fiber to the Room) application scenarios, extending the optical fiber from "to the home" to "to the room", extending the high-quality network to every corner of the room, and effectively improving the user experience. Please refer to Figure 5, which is a schematic diagram of the architecture of the FTTR network. In the FTTR network, the optical network unit ONU is divided into a master ONU (or master gateway) and a slave ONU (or slave gateway) according to their location; the master ONU is connected to the optical line terminal OLT through an uplink optical interface, and provides a downlink optical interface to connect to at least one slave ONU; the slave ONU is connected to the master ONU uplink and establishes a WiFi connection with the user device downlink to transmit service data.

[0050] Please refer to Figure 6, which is a schematic diagram of the structure of an optical network unit provided in Example 3 of this application. This optical network unit can serve as the main gateway in an FTTR network. In terms of structure and function, it differs from the optical network unit provided in Example 1 in that an OLT MAC chip is added. The remaining modules remain unchanged and will not be further described below.

[0051] Specifically, the OLT MAC chip in the optical network unit of the third embodiment of the present application is used to perform 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.

[0052] Specifically, in the setting of the inter-module interface of the optical network unit provided in the third embodiment of the present application, the XGS-PON system chip is connected to the OLT MAC chip through the 10GE / 5GE / 2.5GE / GE electrical interface.

[0053] Please refer to Figure 7, which is a schematic diagram of the structure of an optical network unit provided in Example 4 of the present application. This optical network unit is compatible with both GPON and XGS-PON modes in the downstream direction and operates in XGS-PON mode in the upstream direction. In terms of structure and function, it differs from Example 2 of the present application in that an OLT MAC chip is added. The remaining modules remain unchanged and will not be further described below.

[0054] Specifically, the OLT MAC chip in the optical network unit provided in the fourth embodiment of the present application is used to perform 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.

[0055] Specifically, in the setting of the inter-module interface of the optical network unit provided in the fourth embodiment of the present application, the XGS-PON system chip is connected to the OLT MAC chip through the 10GE / 5GE / 2.5GE / GE electrical interface.

[0056] Please refer to Figure 8, which is a schematic diagram of the authentication method of the optical network unit provided in Example 5 of the present application. It should be noted that the optical network unit in the following method is the optical network unit in Examples 1 to 4 of the present application, the GPON channel refers to the channel between the OLT and the GPON MAC chip in the optical network unit (or the GPON module on the system chip), and the XGS-PON channel refers to the channel between the OLT and the XGS-PON MAC module on the system chip in the optical network unit (or the XGS-PON MAC chip). Specifically, the optical network unit performs the following steps:

[0057] In the first step, the optical network unit goes online and authenticates on the XGS-PON channel. If the authentication is successful, the second step is to configure the service. Otherwise, check whether the automatic discovery function of the PON port of the optical line terminal OLT is 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.

[0058] Specifically, before the ONU goes online and is authenticated, the OLT adds its pre-configuration information and specifies the XGS-PON channel as the management channel on the corresponding interface of the OLT. The OLT then opens a window and performs ranging on the ONU. This process involves the OLT sending a ranging request to the ONU, the ONU responding to the OLT's ranging request, and the OLT setting a compensation delay based on the received message.

[0059] 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 they match, the optical network unit is authenticated successfully.

[0060] In the second step, the XGS-PON channel of the optical network unit receives the optical network unit management and control interface message from the optical line terminal OLT to configure XGS-PON services such as T-CONT and GEM port.

[0061] The ONU management and control interface (OMCI) is the interface used by the optical line terminal (OLT) to manage and control the optical network unit (ONU). Through this interface, the OLT manages the configuration, performance, and security of the ONU.

[0062] In the third step, the GPON channel of the optical network unit receives the optical network unit management control interface message from the optical line terminal OLT. When the optical network unit is the optical network unit in Examples 1 and 3 of the present application, that is, it supports GPON channel upstream transmission, the physical layer configuration of the GPON path ranging interface and the GPON service configuration of the T-CONT and upstream and downstream GEM ports are performed; when the optical network unit is the optical network unit in Examples 2 and 4 of the present application, that is, it does not support GPON channel upstream transmission, the GPON service configuration of the downstream GEM port is performed.

[0063] In the authentication method provided in the fifth embodiment of the present application, the optical network unit is online and authenticated on the XGS-PON channel, and the XGS-PON channel is used as the management channel and the GPON channel is used as the data channel. Alternatively, in some other embodiments, the optical network unit is online and authenticated on the GPON channel, and the GPON channel is used as the management channel and the XGS-PON channel is used as the data channel. Both methods can achieve single-channel online authentication, effectively simplifying management measures.

[0064] Please refer to Figure 9, which shows a PON system provided by an embodiment of the present 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 an optical network unit compatible with GPON and XGS-PON modes in embodiments 1 to 4 of the present application, supporting two data channels: 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 the XGS-PON MAC chip) on the system chip in the optical network unit.

[0065] Embodiment 6 of the present application provides a service data transmission method to achieve sharing of service data between an XGS-PON channel and a GPON channel.

[0066] In the uplink direction, the combined optical network unit Combo ONU can be an optical network unit compatible with GPON and XGS-PON modes in both uplink and downlink in the first or third embodiment of the present application, and performs the following steps:

[0067] In the first step, the optical network unit receives service data from the downstream device;

[0068] In the second step, the optical network unit obtains the current working status of the XGS-PON channel and the GPON channel, and selects the channel that is currently connected to forward the service data;

[0069] In the third step, the optical network unit forwards the service data to the selected channel or stops forwarding the service data.

[0070] Specifically, the connectivity status refers to the state in which the XGS-PON channel or GPON channel can transmit signals normally, which can be determined by whether there is light in the link between the optical network unit and the optical line terminal.

[0071] Specifically, if one of the XGS-PON and GPON channels is connected, the connected channel is selected for service data forwarding. If both channels are connected, the service data load is shared between the two channels according to the routing algorithm. If neither channel is connected, service data forwarding is stopped. The process by which the optical network unit selects the channel for uplink data forwarding based on the current working status of the XGS-PON and GPON channels is controlled by the service processing module on the system chip.

[0072] Optionally, when both channels are connected, the ip-enhance routing algorithm is used to achieve load sharing between the XGS-PON channel and the GPON channel. For example, based on the rates of the XGS-PON channel and the GPON channel, the hash routing weight of the two channels is set to 4:1, and the hash value of the upstream service data is calculated based on any combination of SMAC, DMAC, SIP, DIP, PROTOCOL, and L4Port parameters. The upstream service is forwarded to the XGS-PON channel and the GPON channel respectively at a ratio of 4:1, achieving reasonable sharing of service traffic.

[0073] The specific meanings of the parameters in the routing algorithm are:

[0074] SMAC: source MAC address;

[0075] DMAC: destination MAC address;

[0076] SIP: source IP;

[0077] DIP: destination IP;

[0078] PROTOCOL: protocol type, such as TCP, UDP, etc.

[0079] L4 PORT: Layer 4 port number, including TCP port number, UDP port number, etc.

[0080] On the optical line terminal (OLT) side, since the dual-channel optical network unit occupies two GEM port resources, when the optical line terminal (OLT) receives service data from the GPON channel and the XGS-PON channel, it maps the service data of the two channels into the same service flow before forwarding it.

[0081] In the downstream direction, the combined optical network unit Combo ONU can be the optical network unit compatible with GPON and XGS-PON modes in Examples 1 to 4 of the present application. The optical line terminal OLT load shares the unicast traffic of the GPON channel and the XGS-PON channel of the optical network unit; for unknown unicast, multicast, and broadcast traffic, the XGS-PON channel can be selected, or it can be copied to both channels at the same time. At this time, the optical network unit cooperates in pruning, that is, only accepts one copy of the unknown unicast, multicast, and broadcast message.

[0082] Optionally, the optical line terminal OLT uses the ip-enhance routing algorithm to achieve load sharing of unicast service traffic, sets the hash routing weight of the XGS-PON channel and the GPON channel to 4:1 according to the channel rate, and calculates the hash value of the service data according to the combination of any parameters in SMAC, DMAC, SIP, DIP, PROTOCOL, and L4Port, and forwards the downstream service to the XGS-PON channel and GPON channel of the optical network unit in a ratio of 4:1, thereby achieving reasonable sharing of service traffic.

[0083] It should be noted that although the above disclosure uses specific block diagrams, flow charts, and examples to illustrate various embodiments, each block diagram component, flow chart step, operation, and / or component described and / or illustrated herein can be implemented individually and / or collectively through various hardware, software, or firmware (or any combination thereof) configurations. In addition, the disclosure of any component included among other components should be viewed as an example, as many other architectures can be implemented to achieve the same functionality.

[0084] The process parameters and step sequences described and / or illustrated herein are for illustrative purposes only and may be modified as needed. For example, although the steps illustrated and / or described herein may be shown or discussed in a particular order, these steps do not necessarily have to be performed in the order illustrated or discussed. The various example methods described and / or illustrated herein may also omit one or more steps described and / or illustrated herein or may include additional steps in addition to those disclosed.

[0085] Although 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 as a program product in a variety of ways, regardless of the specific form of the computer-readable medium used to actually perform the distribution. The embodiments disclosed herein can also be implemented using software modules that perform specific tasks. These software modules can include scripts, batch files, or other executable files, which can be stored on a computer-readable medium or in 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 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 through a web browser or other remote interface. The various functions described herein can be provided through a remote desktop environment or any other cloud-based computing environment.

[0086] Although the present application and its advantages have been described in detail, it should be understood that various changes, substitutions, and modifications may be made to the present application without departing from the spirit and scope of the present application as defined by the appended claims. In light of the above teachings, many modifications and variations are possible. The purpose of the various embodiments selected and described is to better explain the principles of the present application and its practical application, thereby enabling those skilled in the art to better utilize the various embodiments of the present application and various modifications suitable for the intended specific use.

[0087] The embodiments according to the present application are described herein. Although the present application has been described in the context of specific embodiments, it should be understood that the present application should not be construed as being 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 with 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, characterized in that, 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 1-3, 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, characterized in that, 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, wherein 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, characterized in that, The third service data and the fourth service data both belong to first uplink service data, and the method further includes: Shunt the first uplink 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 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.

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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