WO2019109252A1

WO2019109252A1 - Method for transmitting and receiving data in pon system, network device, and system

Info

Publication number: WO2019109252A1
Application number: PCT/CN2017/114634
Authority: WO
Inventors: 郑刚
Original assignee: 华为技术有限公司
Priority date: 2017-12-05
Filing date: 2017-12-05
Publication date: 2019-06-13
Also published as: CN111316575A; CN111316575B

Abstract

Disclosed are a method for transmitting and receiving data in a PON system, a network device, and the system. A source network device generates N data frames carrying the same data, N being greater than or equal to 2, and transmits the data frames to a target network device by means of N channels, each channel transmitting one data frame. The target network device selects the data frame transmitted in one of the channels. One of the source network device and the target network device is an OLT, and the other is an ONU. Different channels may be distinguished by means of wavelengths or fiber links. The data frames may be configured with first indication information, the first indication information carrying the same piece of data being identical; second indication information may further be configured to indicate the value of N. Since the source network device transmits the same piece of data by means of the N channels, if some of the channels fail to transmit or transmit incorrectly, the target network device can still select the data frame in the channel that succeeds in transmitting or correctly transmits. The reliability of data transmission is effectively improved.

Description

Data transmitting and receiving method, network device and system in PON system

Technical field

The present invention relates to the field of optical communication technologies, and in particular, to a data transmission and reception method, a network device, and a system in a PON system.

Background technique

Passive Optical Network (PON) technology is a point-to-multipoint fiber access technology. The PON system may include an optical line terminal (OLT), an optical distribution network (ODN), and at least one optical network unit (ONU). The OLT is connected to the ODN, and the ODN is connected to multiple ONUs. .

In the prior art, in order to enable reliable communication between the OLT and the ONU, the protection mechanism used generally includes a Type B protection mechanism and a Type C protection mechanism.

The Type B protection mechanism sets the primary and backup optical fibers between the OLT and the ODN. The two PON ports in the OLT support the protection switching between the boards or the boards, or between the two PON ports of different OLTs. Protection switching, the conditions for triggering protection switching are generally faults in the main fiber or PON board failure.

The Type C protection mechanism sets the trunk fiber and the branch fiber between the OLT and each ONU. When the trunk fiber fails or the branch fiber fails or the PON board fails, the protection switchover is performed.

In summary, the prior art generally performs switching when the fiber is faulty or the PON board is faulty. However, when the trunk fiber or the PON board does not fail, but the data transmitted by the channel where the backbone fiber is located has a small amount of error packets, the protection switching is not performed, so the transmitted data is less accurate, for example, may cause The screen of the broadcast video service even caused a black screen.

Summary of the invention

Embodiments of the present invention provide a data transmission and reception method, a network device, and a PON system in a PON system, which are intended to improve the reliability of data transmission in a PON system.

The first aspect provides a data sending method in a PON system, where the OLT can send data to the ONU, or the ONU can send data to the OLT, and the data sender in the OLT and the ONU is called a source network device, and the data is received. The method is called a target network device, and the method includes: the source network device generates N data frames carrying the same data in the PON framing layer, N is greater than or equal to 2, and then sends the generated N to the same target network device through N channels. Data frames, one for each channel. Therefore, for the same data, it will be transmitted through N channels, which effectively improves the reliability of data transmission.

For example, in a GPON or XGPON system, the PON framing layer may be a GEM layer or an XGEM layer, and the data frame is a GEM frame or an XGEM frame;

For example, in an EPON system, a PON framing layer is an RS layer, and a data frame is an Ethernet frame.

The first indication information may be included in the data frame. If the data carried by the data frame is the same, the first indication information included is the same. If the data carried by the data is different, the first indication information included is different. Target network The network device can quickly identify N data frames carrying the same data according to the first indication information. The first indication information can be located in the frame header of the data frame and can be identified more quickly. In the GEM frame or the XGEM frame, a reserved field is included, and the reserved field may include the foregoing first indication information. In the Ethernet frame, a length/type indication field and a service information field may be added, the length/type indication field is used to indicate the type and/or length of the service information field, and the service information field includes the foregoing first indication information.

The data frame may further include second indication information, and the second indication information indicates an N value. The target network device can determine the number of data frames carrying the same data according to the value of N. After monitoring the data frames carrying the same data, the data frame carrying the data can be stopped, and the operation efficiency is improved, and the operation is not wasted. Resources. In the GEM frame or the XGEM frame, the above reserved field may include the foregoing second indication information. In the Ethernet frame, the foregoing service information field may further include the foregoing second indication information.

The third indication information may also be included in the data frame. When the source network device is an OLT, the OLT generally sends a continuous broadcast data stream to the ONU, and the ONU needs to divide the broadcast data stream, and each divided data generates corresponding data frames, and each data frame carries the data frame. Data. The order of each data frame sent by the source network device in the same channel is the same as the data carried by each data frame in the data stream. However, due to the link problem or the loss of part of the data frame, the order of each data frame to reach the target network device may change, so it is necessary to indicate the location of each data frame. The third indication information is used to indicate the location of each data frame, so that after receiving the data frame, the ONU can restore the data stream according to the third indication information. The value of the third indication information may be sequentially incremented or decremented in the order of the data stream. In the GEM frame or the XGEM frame, the above reserved field may include the foregoing third indication information. In the Ethernet frame, the foregoing service information field may further include the foregoing third indication information. Alternatively, the first indication information and the third indication information may be combined into one field. For example, the first indication information may be multiplexed into the third indication information.

The reserved field may be 18 bytes. In the reserved field, the first 8 bytes may be used as the second indication information, and the last 10 bytes may be used as the first indication information. The last 10 bytes can also be multiplexed into the third indication information at the same time.

Wavelengths can be used to distinguish different channels. Different channels have different wavelengths, which can save fiber links and effectively utilize spectrum resources.

It is also possible to distinguish different channels through fiber links, and the fiber links of different channels are different, that is, the transmission ports of the source network devices corresponding to different channels are different. It can save the spectrum resources by utilizing the existing Type C mechanism fiber link.

The second aspect provides a data receiving method in a PON system, where the OLT receives the data sent by the ONU, and the ONU receives the data sent by the OLT, and the data sender in the OLT and the ONU is called the source network device. The data receiver is called a target network device, and the method includes: the target network device monitors a data frame that the source network device sends on the preset N channels and carries the same data, where N is greater than or equal to 2, and the target network device selects N channels. A data frame transmitted by one of the channels and forwards the selected data frame. Therefore, for the same data, the source network device sends through N channels. If some of the channels fail to transmit or the transmission error occurs, the target network device can still select the data frame in the successfully transmitted or correct channel, which effectively improves the data transmission. reliability.

The target network device may select the data frame according to the reception order and the frame signal quality of each data frame carrying the same data transmitted on the N channels. The data frame receiving sequence and the frame signal quality are comprehensively considered, and the data frame with the higher receiving order and higher frame signal quality is selected, thereby ensuring that the target network device can always select the higher quality data frame, and at the same time Timeliness, does not cause too much delay.

An implementation manner is that each of the target network devices receives the same data transmitted on the N channels. Timing begins when the first of the data frames is in the data frame. When the timing duration reaches the preset duration, the data frame with the highest frame signal quality is selected in the received first data frame and the data frame carrying the same data as the first data frame. Therefore, the target network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness.

In another implementation manner, the target network device starts timing when receiving the first data frame in each data frame that carries the same data transmitted on the N channels; if the received frame signal of the first data frame If the quality is greater than or equal to the preset value, the first data frame received is selected; if the received frame data quality of the first data frame is less than the preset value, the data carried by the first data frame is continuously received. The same other data frame, until the frame signal quality of the received data frame is greater than or equal to the preset value, the data frame is selected or the time duration reaches a preset duration; wherein, if the time duration reaches the preset duration, the received time If the frame signal quality of each data frame that carries the same data is less than a preset value, the data frame with the highest frame signal quality in each received data frame is selected or requested to be retransmitted by the source network device. Therefore, the target network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness.

For the specific configuration method of the data frame and the channel in the second aspect, reference may be made to the first aspect, and details are not described herein again.

The target network device determines the location of each selected data frame in the data stream according to the third indication information, and forwards each data frame in order according to the position of each data frame in the data stream.

In a third aspect, a network device is provided, and the network device may be an OLT or an ONU. The network device is a device that is a sender when the OLT and the ONU transmit data. The network device includes a processor and a transceiver, and the processor is configured to generate, in the PON framing layer, N data frames carrying the same data, where N is greater than or equal to 2, and the transceiver is configured to send the generated data to the same target network device through the N channels. N data frames, one for each channel. Therefore, for the same data, it will be transmitted through N channels, which effectively improves the reliability of data transmission.

For the specific configuration method of the data frame and the channel in the third aspect, reference may be made to the first aspect, and details are not described herein again.

The transceiver is further configured to receive the data stream; the processor is further configured to sequentially divide the data stream into a plurality of pieces of data in order;

The processor is specifically configured to generate, according to each of the divided data, N data frames, where each of the N data frames corresponding to each data carries the corresponding data frame. data.

In a fourth aspect, a network device is provided, and the network device may be an OLT or an ONU. The network device is a device that is a receiver when the OLT and the ONU transmit data. The network device includes a processor and a transceiver, and the processor is configured to monitor a data frame that the source network device sends on the preset N channels and carries the same data, where N is greater than or equal to 2, and the processor further selects among the N channels. The data frame transmitted by one channel, and the transceiver forwards the selected data frame. Therefore, for the same data, the source network device sends through N channels. If some of the channels fail to transmit or transmit errors, the network device as the receiver can still select the data frame in the channel that is successfully transmitted or correctly, which effectively improves. The reliability of data transmission.

The processor is specifically configured to select a data frame according to a receiving sequence and a frame signal quality of each data frame carrying the same data transmitted on the N channels. The data frame receiving sequence and the frame signal quality are comprehensively considered, and the data frame with the higher receiving order and the higher frame signal quality is selected, thereby ensuring that the network device can always select the higher quality data frame. At the same time, it takes into account the timeliness and does not cause too much delay.

In one implementation, the processor starts timing when the transceiver receives the first one of the data frames carrying the same data transmitted on the N channels. When the timing duration reaches the preset duration, the processor selects the data frame with the highest frame signal quality in the first data frame received by the transceiver and the data frame carrying the same data as the first data frame. Therefore, the network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness.

In another implementation manner, the processor starts timing when the transceiver receives the first data frame of each data frame that carries the same data and is transmitted on the N channels; if the first data frame received by the transceiver If the frame signal quality is greater than or equal to the preset value, the processor selects the first data frame received by the transceiver; if the frame signal quality of the first data frame received by the transceiver is less than a preset value, the transceiver continues Receiving other data frames that are the same as the data carried by the first data frame until the frame signal quality of the data frame received by the transceiver is greater than or equal to a preset value, the processor selects the data frame or the processor timing reaches the preset If the duration of the timing reaches the preset duration, the frame signal quality of each data frame that the transceiver receives the same data is less than the preset value, and the processor selects each of the received data frames. The data frame with the highest frame signal quality or requesting the source network device to retransmit. Therefore, the target network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness.

For the specific configuration method of the data frame and the channel in the fourth aspect, reference may be made to the first aspect, and details are not described herein again.

The processor determines, according to the third indication information, the location of the selected respective data frames in the data stream, and the transceiver forwards each data frame in order according to the position of each data frame in the data stream.

A fifth aspect provides a data transmitting apparatus in a PON system, where the apparatus includes: a generating module, configured to generate, in a PON framing layer, N data frames carrying the same data, where N is an integer greater than or equal to 2; a module, configured to send each of the data frames to the same target network device by using N channels, where each of the channels respectively sends a data frame; wherein the data sending device can be applied to an optical line terminal or an optical network. In the unit, when the data transmitting device is applied to the optical line terminal, the target network device is an optical network unit; or, when the data transmitting device is applied to the optical network unit, the target network device is an optical line terminal.

For the specific configuration method of the data frame and the channel in the fifth aspect, reference may be made to the first aspect, and details are not described herein again.

The transceiver module is further configured to receive a data stream; the data sending device further includes a segmentation module, configured to sequentially divide the data stream into a plurality of pieces of data in sequence; and the generating module is specifically configured to separately generate each of the divided data N data frames, wherein each of the N data frames corresponding to each piece of data carries its corresponding data.

The sixth aspect provides a data receiving apparatus in a PON system, where the apparatus includes: a monitoring module, configured to monitor a data frame that the source network device sends on the preset N channels and carries the same data, where N is greater than or An integer equal to 2; a selection module, configured to select the data frame transmitted by one of the N channels; a transceiver module configured to forward the selected data frame; the data receiving device may be applied to light In the line terminal or the optical network unit, when the data receiving device is applied to the optical line terminal, the target network device is an optical network unit; or, when the data receiving device is applied to the optical network unit, the target network device is an optical line terminal .

For the specific configuration method of the data frame and the channel in the sixth aspect, reference may be made to the first aspect, and details are not described herein again.

The selection module can according to the receiving order and frame letter of each data frame carrying the same data transmitted on the N channels. Number quality selection data frame. The data frame receiving sequence and the frame signal quality are comprehensively considered, and the data frame with the higher receiving order and higher frame signal quality is selected, thereby ensuring that the target network device can always select the higher quality data frame, and at the same time Timeliness, does not cause too much delay.

In one implementation, the apparatus may further include a timing module configured to start timing when receiving the first one of the data frames of the same data transmitted on the N channels. When the timing duration reaches the preset duration, the selection module selects the data frame with the highest frame signal quality in the received first data frame and the data frame carrying the same data as the first data frame. Therefore, the target network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness.

In another implementation manner, the apparatus may further include a timing module, configured to start timing when receiving the first data frame of each data frame carrying the same data transmitted on the N channels; if the received If the frame signal quality of a data frame is greater than or equal to a preset value, the selection module selects the first data frame received; if the frame signal quality of the received first data frame is less than a preset value, the transceiver module continues Receiving another data frame that is the same as the data carried by the first data frame until the frame signal quality of the received data frame is greater than or equal to a preset value, and the selecting module selects the data frame or the time duration reaches a preset duration; If the frame signal quality of each data frame carrying the same data received by the transceiver module is less than a preset value when the timing duration reaches the preset duration, the selection module selects the highest quality of the frame signal in each received data frame. The data frame or request the source network device to retransmit. Therefore, the target network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness.

The apparatus further includes a determining module configured to determine, according to the third indication information, a location of the selected respective data frames in the data stream, and the transceiver module forwards the respective data frames in order according to the locations of the respective data frames in the data stream.

According to a seventh aspect, there is provided an optical line terminal comprising the apparatus of the fifth or sixth aspect, or the optical line terminal is the network device of the third or fourth aspect.

In an eighth aspect, an optical network unit is provided, the optical network unit comprising the device according to the fifth or sixth aspect, or the optical network unit being the network device according to the third or fourth aspect.

According to a ninth aspect, a PON system is provided, the PON system comprising: the optical line terminal according to the seventh aspect, and the optical network unit according to the eighth aspect.

A still further aspect of the present application provides a computer readable storage medium having stored therein computer software instructions for use with the network device of the above third aspect, when it is run on a computer, The computer is caused to perform the method described in the first aspect above.

In still another aspect of the present application, a computer readable storage medium storing computer software instructions for use in the network device of the above fourth aspect, when it is run on a computer, The computer is caused to perform the method described in the second aspect above.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments and the prior art description will be briefly described below. Obviously, the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those of ordinary skill in the art based on these drawings without any inventive labor.

1 is a schematic structural diagram of a PON system according to an embodiment of the invention;

2 is an exemplary flowchart of a data transmission method according to an embodiment of the present invention;

3 is a schematic structural diagram of an XGEM frame according to an embodiment of the invention;

4 is a schematic structural diagram of an Ethernet frame according to an embodiment of the invention;

FIG. 5 is a schematic diagram of data transmission according to an embodiment of the invention; FIG.

FIG. 6 is a schematic diagram of data transmission according to another embodiment of the present invention; FIG.

FIG. 7 is an exemplary flowchart of a data transmission method according to another embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of data frame selection according to an embodiment of the invention; FIG.

FIG. 9 is a schematic diagram of an exemplary hardware structure of a network device according to an embodiment of the invention.

Detailed ways

In order to make the object, the features and the advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The technical solution of the embodiment of the present invention can be applied to various passive optical networks (PONs), such as Gigabit Passive Optical Network (GPON) and Ethernet passive optical network (Ethernet). Passive Optical Network (EPON), 10G EPON, 10-Gigabit-capable Passive Optical Network (XG-PON), 10-Gigabit-capable symmetric passive optical network , XGS-PON), Next Generation Passive Optical Network (NGPON), etc.

1 is a schematic structural diagram of a PON system to which various embodiments of the present invention are applied. As shown in FIG. 1, the PON system 100 includes at least one OLT 110, at least one ODN 120, and a plurality of ONUs 130. The OLT 110 provides a network side interface for the PON system 100, and the ONU 130 provides a user side interface for the PON system 100 to be connected to the ODN 120. If the ONU 130 directly provides the user port function, it is called an Optical Network Terminal (ONT). For convenience of description, the ONU 130 mentioned below generally refers to an ONT that can directly provide a user port function and an ONU that provides a user side interface. The ODN 120 is a network of optical fibers and passive optical splitting devices for connecting OLT 110 devices and ONUs 130 devices for distributing or multiplexing data signals between the OLT 110 and the ONUs 130.

In the PON system 100, the direction from the OLT 110 to the ONU 130 is defined as the downstream direction, and the direction from the ONU 130 to the OLT 110 is defined as the upstream direction. In the downlink direction, the OLT 110 broadcasts the downlink data to the multiple ONUs 130 managed by the OLT 110 by using a Time Division Multiplexing (TDM) method. Each ONU 130 only receives data carrying its own identity; The ONUs 130 communicate with the OLT 110 in a Time Division Multiple Access (TDMA) manner, and each ONU 130 transmits uplink data according to the time domain resources allocated by the OLT 110. With the above mechanism, the downlink optical signal sent by the OLT 110 is a continuous optical signal, and the upstream optical signal sent by the ONU 130 is a burst optical signal.

The PON system 100 may not require active devices to implement data distribution between the OLT 110 and the ONU 130. The communication network system, for example, in a particular embodiment, data distribution between the OLT 110 and the ONU 130 can be implemented by passive optical devices (such as optical splitters) in the ODN 120. Moreover, the PON system 100 can be a GPON system defined by the ITU-T G.984 standard, an Ethernet Passive Optical Network (EPON) defined by the IEEE 802.3ah standard, or a next-generation passive optical network (NGPON). ), such as XGPON or 10G EPON. Various passive optical network systems defined by the above standards fall within the scope of the present invention.

The OLT 110 is typically located at a Central Office (CO), and can centrally manage at least one ONU 130 and transfer data between the ONU 130 and an upper layer network. Specifically, the OLT 110 can serve as an medium between the ONU 130 and the upper layer network (such as the Internet, a Public Switched Telephone Network (PSTN), and forward data received from the upper layer network to the ONU 130, And forwarding data received from the ONU 130 to the upper layer network. The specific configuration of the OLT 110 may vary depending on the particular type of the PON system 100, for example, in one embodiment, the OLT 110 may include a transmission. And a receiver for transmitting a downlink continuous optical signal to the ONU 130, the receiver for receiving an uplink burst optical signal from the ONU 130, wherein the downlink optical signal and the uplink optical signal can be performed by the ODN 120 Transmission, but the embodiment of the invention is not limited thereto.

The ONU 130 can be distributed in a user-side location (such as a customer premises). The ONU 130 can be a network device for communicating with the OLT 110 and the user, in particular, the ONU 130 can act as a medium between the OLT 110 and the user, for example, the ONU 130 can receive data from the OLT 110. Forwarded to the user and forwarded data received from the user to the OLT 110.

The ODN 120 can be a data distribution network that can include fiber optics, optocouplers, beamsplitters, or other devices. In one embodiment, the fiber, optocoupler, splitter, or other device may be a passive optical device, in particular, the fiber, optocoupler, optical splitter, or other device may be at OLT 110 and ONU 130 Devices that do not require power supply when distributing data signals. Specifically, taking an optical splitter as an example, the optical splitter can be connected to the OLT 110 through a trunk optical fiber and connected to the plurality of ONUs 130 through a plurality of branch optical fibers, thereby implementing the OLT 110 and the ONU 130. A point-to-multipoint connection between them. Additionally, in other embodiments, the ODN 120 may also include one or more processing devices, such as optical amplifiers or relay devices. In addition, the ODN 120 may specifically extend from the OLT 110 to the plurality of ONUs 130, but may be configured as any other point-to-multipoint structure, and the embodiment of the present invention is not limited thereto.

In the prior art, a reliable communication between the OLT 110 and the ONU 130 is generally performed by a protection mechanism such as Type B and Type C. Various embodiments of the present invention provide a new protection mechanism to enable reliable communication between the OLT 110 and the ONU 130. The protection mechanism in the present invention can be applied to the OLT 110 to send data to the ONU 130, and can also be applied to the ONU 130 to send data to the OLT 110. For convenience of description, the device as the sender in the OLT 110 and the ONU 130 is hereinafter referred to as a source network device, and the device as a receiver is referred to as a target network device.

To this end, a data transmission method is provided below. The data transmission method provided by the embodiment of the present invention will be described in detail below with reference to the accompanying drawings. As shown in FIG. 2, the method includes steps S200 to S240. Step details:

S200: The source network device generates, in a PON framing layer (also called a framing sub-layer), N data frames carrying the same data, where N is an integer greater than or equal to 2;

In an embodiment, the value of N may be a preset value, for example, a value that may be pre-configured by the user into the source network device and the target network device, or a value pre-configured by the source network device and the target network device (eg, when shipped from the factory) Configured of).

In another embodiment, the value of N may also be adaptively determined by the source network device. For example, the source network device is adaptively determined according to the link state with the target network device, and may be set if the link quality is poor. A larger value of N, if the link status is better, a smaller value of N can be set.

In another embodiment, the value of N may have a corresponding relationship with the target network device. For example, when the target network device is the ONU 130, different ONUs 130 can set a corresponding N value according to their requirements for signal quality. If the ONU 130 has a higher signal quality requirement, a larger N value can be set correspondingly, if the ONU 130 pairs the signal. If the quality requirement is low, a smaller N value can be set accordingly. The ONU 130 can directly report the required N value to the OLT 110, and the OLT 110 stores the correspondence between the ONU 130 and its corresponding N value. Alternatively, the ONU 130 can also report the signal quality requirement to the OLT 110, and the OLT 110 determines the N according to the signal quality requirement reported by the ONU 130. Value, and store the correspondence between the ONU 130 and its corresponding N value.

Alternatively, the value of N may also be determined by the source network device based on the link state with the target network device and the signal quality requirements of the target network device.

The data carried by each data frame is the same between the N data frames generated by the source network device. The data source carried by the data frame may be data received from other network devices or generated by the source network device. When the data source is data received from other network devices, the source network device may copy the received data by N-1 copies, and then generate the data frame separately from the received data and the copied N-1 data, that is, a total of Generate N data frames. When the data source is directly generated by the source network device, the source network device can form a piece of data, and then copy the N-1 data, and then separately generate the data frame; or the source network device can directly generate N data that carries the same data. frame.

In order for the target network device to quickly identify N data frames carrying the same data, each data frame may include first indication information. In an embodiment, the first indication information included in the N data frames carrying the same data are the same. That is, if any of the two data frames is the same, the first indication information included is the same; if the data carried by the data is different, the first indication information included is different. Therefore, the target network device can quickly identify the N data frames carrying the same data according to the first indication information. For example, the source network device currently has two data to be sent, the first data corresponding to generating two data frames, and the second data corresponding to generating three data frames, and the first data corresponding to the two data frames, each Each of the data frames includes the first indication information, and the two first indication information are the same, for example, the two first indication information are 300. Each of the three data frames corresponding to the second data includes first indication information, and the three first indication information are the same, and the first indication information and the first indication of the two data frames. The information is different, such as the three first indications are 301. After receiving the data frames, the target network device may quickly filter out the data frames with the same first indication information according to the first indication information. For example, the two data frames whose first indication information is set to 300 can be quickly filtered out, or the three data frames whose first indication information is set to 301 can be quickly filtered out.

In a GEM frame or an XGEM frame, a reserved field may be included. As shown in FIG. 3, FIG. 3 is a schematic structural diagram of an XGEM frame according to an embodiment of the present invention. The XGEM frame includes a frame header and a payload, and the frame header includes a Payload Length Indicator (PLI) field and a Port-ID field. , Reserves field, frame header error check (Head Error) Check, HEC) fields, etc. The reserved field may include the foregoing first indication information. The reserved field may all be used as the first indication information or partially as the first indication information. For example, the reserved field may be 18 bits, and all 18 bits may be used as the first indication information, or only 10 of the bits may be selected as the first indication information.

In an Ethernet frame, as shown in FIG. 4, FIG. 4 is a schematic structural diagram of an Ethernet frame according to an embodiment of the present invention, and may add a Length/Type indication field and a Service Information (FSN) field, and a length/type indication. The field is used to indicate the type and/or length of the service information field, and the service information field includes the first indication information described above. This Ethernet frame is very compatible with existing Ethernet frames. The service information field may all be used as the first indication information or partially as the first indication information. For example, the service information field is 16 bits, and 15 of them can be used as the first indication information.

In another embodiment, the first indication information included in the N data frames carrying the same data may also be related. The first indication information included in the data frame carrying different data is irrelevant. That is, if any of the two data frames is the same, the first indication information included is related; if the data carried by the data is different, the included first indication information is irrelevant. The source network device and the target network device may preset the correlation of the first indication information. For example, the correspondence between the groups of first indication information may be preset, and each group correspondence includes at least two first indication information, belonging to the same group. The first indication information is considered relevant, and the first indication information belonging to different groups is considered irrelevant. For example, the first group correspondence includes three first indication information, which are 300, 301, and 302, respectively; and the second group correspondence includes two first indication information, which are respectively 303 and 304. The source network device and the target network device can be considered to be related between 300, 301 and 302, and 303 and 304 are related, and the remaining combinations are irrelevant, for example, 300 and 303 are not related. After receiving the data frames, the target network device may quickly filter out the data frames related to the first indication information according to the first indication information of each data frame. For example, the first data indicating that the first indication information is 300, 301, and 302 can be quickly filtered out, and the two data frames whose first indication information is respectively 303 and 304 can be quickly filtered out.

The first indication information may be set before the frame header of each data frame, so that the target network device can identify the first indication information more quickly, thereby more quickly identifying each data frame carrying the same data.

In an embodiment, the data frame may also include second indication information, the second indication information indicating the N value. The above reserved fields may all be used as the second indication information, or may be partially used as the second indication information. For example, the reserved field may be 18 bits, and all 18 bits may be used as the second indication information, or only 8 of them may be selected as the second indication information, and the other 10 bits are used as the first indication information. As shown in FIG. 3, the first 8 bits of the reserved field are used as the second indication information, and the last 10 bits are used as the first indication information. It can be understood that the number of bits of the first indication information and the second indication information is not limited to the above, and may be other bit numbers. The service information field shown in FIG. 4 may be 16 bits, and one of the bits may be used as the second indication information, indicating whether it is a single source or a multiple source. For example, when it is “0”, it represents a single source, and when it is “1”, it represents Multi-source (that is, the number of transmitted data frames is greater than or equal to 2), at which point no specific N value is indicated, and another 15 bits are used for the first indication information. It is also possible to use 3 bits or 2 bits or other number of bits for the second indication information, and the remaining bits are used as the first indication information.

If the data frame carrying the data is three, at least one of the three data frames includes the second indication information, and each of the three data frames includes the second indication information. The second indication information indicates a value of 3. In one example, the second indication information is equal to 3; in another example, the second indication information indirectly indicates 3. If the source network device sends the three data frames, after the target network device receives the first data frame, according to the second indication information of the first received data frame, the data frame carrying the data may be determined. The number is 3, so continue to receive, After receiving the data frames carrying the data, the target network device does not need to continue to monitor the data frames carrying the data, thereby reducing the waste of resources of the target network device, thereby improving the operational efficiency of the target network device without wasting the target. The operating resources of the network device.

S210. The source network device sends each of the data frames to the target network device by using the N channels, and each of the channels respectively sends one of the data frames.

In an embodiment, different channels can be distinguished by wavelengths, and wavelengths of different channels are different, which can save fiber links and effectively utilize spectrum resources. As shown in FIG. 5, FIG. 5 shows three ONUs 130, which are referred to as a first ONU 130, a second ONU 130, and a third ONU 130 from top to bottom. The OLT 110 transmits data to the ONU 130 as an example, and the OLT 110 passes through two channels. Sending a data frame to the first ONU 130, the wavelengths of the two channels are λ1 and λ3, respectively; the OLT 110 sends data frames to the second ONU 130 through three channels, the wavelengths of the three channels are λ1, λ2, and λ4, respectively; OLT110 Data frames are transmitted to the third ONU 130 through four channels, the wavelengths of which are λ1, λ2, λ3, and λ4, respectively.

In another embodiment, different channels may be distinguished by a fiber link, and the fiber links of different channels are different, that is, the source network devices corresponding to different channels have different transmission ports, and can utilize the existing Type C mechanism. Fiber links save spectrum resources. As shown in FIG. 6, each ONU 130 and the OLT 110 have two fiber links, and each fiber link is one channel.

In an embodiment, the wavelengths of the N channels are different from each other. That is, the N channels are all distinguished by wavelength.

In another embodiment, the fiber links of the N channels are different from each other, that is, the N channels are all distinguished by the fiber link, or the N channels are all distinguished by the sending port of the source network device.

In another embodiment, the N channels are simultaneously distinguishable by wavelength and fiber link. That is, of the N channels, the wavelengths or fiber links of any two channels are different. For example, there are four channels, two fiber links are provided between the OLT 110 and one ONU 130. Two wavelength-differentiated channels can be set on the first fiber link, and the second fiber link can also be set. 2 channels distinguished by wavelength. For example, the first fiber link can transmit data frames through wavelengths λ1 and λ2, respectively, and the second fiber link can transmit data frames through wavelengths λ3 and λ4, respectively.

Step S220: The target network device monitors a data frame that the source network device sends on the preset N channels and carries the same data.

In an embodiment, when the source network device is the OLT 110 and the target network device is the ONU 130, the N channels may be preset between the OLT 110 and the ONU 130, or pre-configured for the OLT 110 and notified to the ONU 130 in advance, thereby The OLT 110 can send a data frame carrying the same data to the ONU 130 by configuring the N channels of the ONU 130. The ONU 130 can monitor the data frames carrying the same data on the preset N channels.

In another embodiment, when the source network device is the ONU 130 and the target network device is the OLT 110, the N channels may be preset between the OLT 110 and the ONU 130, or pre-configured for the OLT 110 and notified to the ONU 130 in advance. Therefore, the ONU 130 can send data frames carrying the same data to the OLT 110 through the preset N channels, and the OLT 110 can also monitor the data frames carrying the same data on the N channels allocated to the ONU 130.

Step S230, the target network device selects the data frame transmitted by one of the N channels.

In an embodiment, the target network device can select a channel with a high signal transmission quality to receive a data frame according to the signal transmission quality of each channel, thereby ensuring that the target network device can always receive a higher quality data frame. Reliability of data transmitted in high PON systems. For example, if there are three channels pre-configured, if the signal transmission quality of the first channel is high during the period from T1 to T2, the data of the first channel is continuously received during the period from T1 to T2; during the period from T2 to T3 If the signal transmission quality of the third channel is high, the data of the third channel is continuously received during the period from T2 to T3.

In another embodiment, the target network device selects the data frame according to a receiving order and a frame signal quality of respective data frames carrying the same data transmitted on the N channels. The data frame receiving sequence and the frame signal quality are comprehensively considered, and the data frame with the higher receiving order and higher frame signal quality is selected, thereby ensuring that the target network device can always select the higher quality data frame, and at the same time Timeliness, does not cause too much delay.

Specifically, in an example, the target network device starts timing when receiving the first data frame in each data frame that carries the same data transmitted on the N channels; for example, the source network device is at 3 Three data frames carrying the same data are transmitted on the channel, and the data frame on the second channel first arrives at the target network device, and the target network device starts timing when receiving the data frame on the second channel. It can be understood that the target network device can identify the receiving order of the data frame according to the first indication information in the data frame. If no other data frame carrying the first indication information is received before receiving the data frame, the data frame is considered to be the first arriving data frame.

When the timing duration reaches the preset duration, the data frame with the highest frame signal quality is selected in the received first data frame and the data frame carrying the same data as the first data frame. Therefore, the target network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness. The frame signal quality can be measured, for example, by the bit error rate, and the lower the bit error rate, the higher the frame signal quality.

The preset duration can be set according to actual needs, and is not limited here. If the data frame on the second channel and the third channel is received within the preset time period, the first channel fails to successfully transmit the data frame to the target network device due to a line failure or a large line delay, or The data frame is transmitted to the target network device within a preset duration. Then, the target network device may first buffer the data frames received through the second channel and the third channel, and separately calculate the frame signal quality of the two data frames. Then, when the timing duration reaches the preset duration, the data frame with the highest frame signal quality among the two data frames is selected. The frame signal quality can be measured, for example, by the bit error rate, and the lower the bit error rate, the higher the frame signal quality.

Specifically, in another example, the target network device starts timing when receiving the first data frame in each data frame that carries the same data transmitted on the N channels;

If the received bit error rate of the first data frame is less than or equal to a preset value, the received first data frame is selected. The size of the preset value can be set according to actual needs, and is not limited herein.

And if the received bit error rate of the first data frame is greater than the preset value, continuing to receive other data frames that are the same as the data carried by the first data frame until receiving If the error rate of the data frame is less than or equal to the preset value, the data frame is selected or the time duration reaches a preset duration;

If the error rate of each of the received data frames carrying the same data is greater than the preset value when the time duration reaches a preset duration, the error rate in each received data frame is selected. The lowest data frame or request the source network device to retransmit.

Therefore, the target network device can quickly select a high-quality data frame within a preset time period, which satisfies both the quality requirement and the timeliness.

Step S240, the target network device forwards the selected data frame.

When the target network device is the OLT 110, the OLT 100 forwards the data frame to other devices upstream. For example, it may be a network side device, and the network side device may be, for example, a broadband network gateway (BNG) device.

When the target network device is the ONU 130, the ONU 130 forwards the data frame to other network devices in the downstream. For example, the data frame can be forwarded to the user terminal, the switch, the router, etc., and the user terminal can be, for example, a computer or a television.

In the embodiment of the present invention, when N channels are set between the source network device and the target network device, when the source network device sends data to the target network device, N data frames carrying the same data are generated, and each channel is correspondingly transmitted. A data frame, the target network device can monitor the data frames transmitted on the N channels, and select the data frames on one of the channels for forwarding, thereby effectively improving the reliability of the transmitted data in the PON system.

Further, as shown in FIG. 7, before step S200, the method further includes:

Step S250, the source network device receives the data stream; when the source network device is the OLT 110, the OLT 110 may receive the data stream. The data stream can be a broadcast data stream.

Step S260, the source network device sequentially divides the data stream into several pieces of data in order;

The step S200 specifically includes: the source network device respectively corresponding to each of the divided data to generate N pieces of the data frames, wherein each of the N pieces of the data frames corresponding to each piece of data is Data frames each carry their corresponding data.

In step S201, the order of each data frame sent by the source network device in the same channel is the same as the data carried by each data frame in the data stream. Therefore, the order in which the source network device sends data is unchanged, and the target network device can be assisted to receive the data frame in the correct order.

In an embodiment, in order to further enable the target network device to forward the respective data frames in the correct order, the data frame further includes third indication information, the third indication information indicating that the data carried by the data frame is in the data stream. s position. Determining, by the target network device, a location of each selected data frame in the data stream according to the third indication information, and forwarding each of the data frames in order according to a position of each of the data frames in the data stream .

The above reserved fields may all be used as the third indication information, or may be partially used as the third indication information. The third indication information corresponding to each piece of data divided by the same data stream may be in an increasing order or a decreasing order. For example, as shown in FIG. 8, one data stream is divided into 7 pieces of data, the third indication information of the first data may be 301, the third indication information of the second data may be 302, and so on. The third indication information of the 7 pieces of data may be 307. It is assumed that the data stream is transmitted through two channels (illustrated as channel 1 and channel 2), and the target network device first receives the data stream through channel 1, so the target network device preferentially selects the data frame received by channel 1. However, the third data frame in channel 1 is lost, and the target network device can identify the data frame received by channel 1 according to the third indication information, and determine that the third data frame is lost. At the same time, the target network device can also identify the third data frame in the channel 2 according to the third indication information, and therefore, the third data frame in the channel 2 will be selected.

Thereby, the target network device can directly determine the location of the data frame in the data stream according to the third indication information.

In the GEM frame or the XGEM frame, the above reserved field may include the foregoing third indication information. In the Ethernet frame, the foregoing service information field may further include the foregoing third indication information. Alternatively, the first indication information and the third indication information may be combined into one field. For example, the first indication information may be multiplexed into the third indication information. Each of the data frames generated according to the first data includes a field 301, which may be used as the first indication information or the third indication information to identify the location of the data frame.

The present invention also provides a network device, which may be an OLT 110 or an ONU 130.

As shown in FIG. 9, the network device includes a processor 410, a memory 420, a transceiver 430, and a wavelength division multiplexer 440.

The processor 410 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit ASIC, or at least one integrated circuit for executing related programs to implement the technology provided by the embodiments of the present invention. Program.

The memory 420 may be a read only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 420 can store an operating system and other applications. When the technical solution provided by the embodiment of the present invention is implemented by software or firmware, the program code for implementing the technical solution provided by the embodiment of the present invention is saved in the memory 420 and executed by the processor 410.

In an embodiment, the processor 410 may internally include a memory 420. In another embodiment, processor 410 and memory 420 are two separate structures.

Transceiver 430 can include a light emitter and/or a light receiver. The light emitter can be used to transmit an optical signal and the optical receiver can be used to receive an optical signal. The light emitter can be realized by a light emitting device such as a gas laser, a solid laser, a liquid laser, a semiconductor laser, a direct modulation laser, or the like. The light receiver can be implemented by a photodetector such as a photodetector or a photodiode such as an avalanche diode. The transceiver 430 can also include a digital to analog converter and an analog to digital converter.

The network device may also include a medium access control (MAC) for performing functions such as parsing data. The MAC may be present independently of processor 410 or may be part of processor 410.

The wavelength division multiplexer 440 is coupled to the transceiver 430, which acts as a multiplexer when the network device transmits an optical signal. When the network device receives the optical signal, the wavelength division multiplexer acts as a demultiplexer. A wavelength division multiplexer can also be referred to as an optical coupler.

When the network device is used as the source network device, the processor 410 is configured to generate the data frame, divide the data stream into a plurality of data, and the like, and the transceiver 430 is configured to receive the data stream, send the data frame, and the like to the target network device. Specifically, as can be seen from the above embodiment, the processor 410 shown in FIG. 9 can perform steps S200 and S260 in FIGS. 2 and 7, and the transceiver 430 can perform steps S210 and S250 in FIGS. 2 and 7. For more details of the foregoing steps of the processor 410 and the transceiver 430, reference may be made to the related descriptions of the foregoing embodiments of the data transmission method and the accompanying drawings, and details are not described herein.

When the network device is the target network device, the processor 410 is configured to monitor the data frame, select a data frame, etc., and the transceiver 430 is configured to forward a data frame or the like. Specifically, as can be seen from the above embodiment, the processor 410 shown in FIG. 9 can perform steps S220 and S230 in FIGS. 2 and 7, and the transceiver 430 can perform step S240 in FIGS. 2 and 7. For more details of the foregoing steps of the processor 410 and the transceiver 430, reference may be made to the related descriptions of the foregoing embodiments of the data transmission method and the accompanying drawings, and details are not described herein.

In the embodiment of the present invention, when N channels are set between the source network device and the target network device, when the source network device sends data to the target network device, N data frames carrying the same data are generated, and each channel is correspondingly transmitted. A data frame, the target network device can monitor the data frames transmitted on the N channels, and select the data frames on one of the channels for forwarding, thereby effectively improving the accuracy of the data transmitted in the PON system.

The present invention also provides a passive optical network system including the source network described in the foregoing embodiments. Device and target network device. For details, refer to the foregoing various embodiments, and details are not described herein again.

The embodiment of the present invention further provides a data frame, and the specific description of the data frame may refer to the foregoing embodiment, and details are not described herein again.

The embodiment of the present invention further provides a communication device, which may be the above network device, or may be a certain module, component, circuit or device in the network device.

When the communication device is used in a source network device, the communication device includes:

a generating module, configured to generate N data frames carrying the same data, where N is an integer greater than or equal to 2;

The transceiver module is configured to send each of the data frames to the target network device through the N channels, and each of the channels respectively sends a data frame.

Further, the transceiver module is further configured to receive a data stream;

The communication device further includes a segmentation module for sequentially dividing the data stream into a plurality of pieces of data in order;

The generating module is specifically configured to generate N pieces of the data frames corresponding to each of the divided data, wherein each of the N data frames corresponding to each piece of data is generated. Both carry their corresponding data.

For the setting of the channel, the setting of the data frame, and the like, reference may be made to the description of the above embodiments, and details are not described herein again.

When the communication device is used for a target network device, the communication device includes:

a monitoring module, configured to monitor a data frame that the source network device sends on the preset N channels and carries the same data, where N is an integer greater than or equal to 2;

a selection module, configured to select the data frame transmitted by one of the N channels;

And a transceiver module, configured to forward the selected data frame.

Further, the selecting module is specifically configured to select the data frame according to a receiving sequence and a frame signal quality of each data frame carrying the same data transmitted on the N channels.

Specifically, the communication device further includes a timing module, configured to start timing when the transceiver module receives the first one of the data frames of the data frames carrying the same data transmitted on the N channels;

The selecting module is specifically configured to: when the first time period of the received data frame and the first data frame carrying the same data, select the data frame with the highest frame signal quality when the time duration reaches a preset time length. .

Further, the communication device further includes a determining module, configured to determine, according to the third indication information, a location of each selected data frame in the data stream, where the transceiver module is further configured to: according to each of the data frames The locations in the data stream forward each of the data frames in order.

It can be understood that the communication device also has the beneficial effects described in the foregoing various embodiments, and details are not described herein again.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the several embodiments provided by the present application, it should be understood that the disclosed device may be implemented in other manners. Now. For example, the device embodiments described above are merely illustrative. For example, the division of the above units is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated. Go to another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described above as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The above-described integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. The instructions include a plurality of instructions for causing a computer device (which may be a personal computer, server or network device, etc., and in particular a processor in a computer device) to perform all or part of the steps of the above-described methods of various embodiments of the present invention. The foregoing storage medium may include: a U disk, a mobile hard disk, a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), and the like. The medium of the code.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents of the technical solutions of the embodiments of the present invention.

Claims

A data transmission method in a PON system, characterized in that the method comprises:

The source network device generates N data frames carrying the same data in the PON framing layer, where N is an integer greater than or equal to 2;

The source network device sends each of the data frames to the same target network device through N channels, and each of the channels respectively sends one of the data frames;

The source network device is an optical line terminal, and the target network device is an optical network unit;

Alternatively, the source network device is an optical network unit, and the target network device is an optical line terminal.
The method according to claim 1, wherein the PON framing layer is a GEM layer or an XGEM layer, and the data frame is a GEM frame or an XGEM frame; or the PON framing layer is an RS layer. The data frame is an Ethernet frame.
The method according to claim 2, wherein the data frame comprises first indication information, and if the data carried by the two of the data frames are the same, the first indication information included is the same If the data carried is different, the first indication information included is different.
The method according to claim 3, wherein the GEM frame and the XGEM frame each include a reserved field, the reserved field includes the first indication information; the Ethernet frame includes a length/type indication field and a service information field, the length/type indication field is used to indicate a type and/or a length of the service information field, and the service information field includes the first indication information.
A data receiving method in a PON system, characterized in that the method comprises:

The target network device monitors a data frame that is sent by the source network device on the preset N channels and carries the same data, where N is an integer greater than or equal to 2;

The target network device selects the data frame transmitted by one of the N channels;

Transmitting, by the target network device, the selected data frame;

The source network device is an optical line terminal, and the target network device is an optical network unit;

Alternatively, the source network device is an optical network unit, and the target network device is an optical line terminal.
The method according to claim 5, wherein the selecting, by the target network device, the data frame transmitted by one of the N channels comprises:

The target network device selects the data frame according to a receiving sequence and a frame signal quality of respective data frames carrying the same data transmitted on the N channels.
The method according to claim 5 or 6, wherein the data frame is a GEM frame or an XGEM frame, or the data frame is an Ethernet frame.
The method according to claim 7, wherein the data frame comprises first indication information, and if the data carried by the two of the data frames are the same, the first indication information included is the same. If the data carried is different, the first indication information included is different.
A network device, where the network device includes:

a processor, configured to generate, in a PON framing layer, N data frames carrying the same data, where N is an integer greater than or equal to 2;

a transceiver, configured to send each of the data frames to the same target network device through the N channels, where each of the channels respectively sends a data frame;

The network device is an optical line terminal, and the target network device is an optical network unit;

Alternatively, the network device is an optical line terminal, and the target network device is an optical network unit.
The network device according to claim 9, wherein the PON framing layer is a GEM layer or an XGEM layer, and the data frame is a GEM frame or an XGEM frame; or the PON framing layer is an RS layer. The data frame is an Ethernet frame.
The network device according to claim 9 or 10, wherein the wavelengths of the different channels are different, or the transmission ports of the network devices corresponding to the different channels are different.
The network device according to claim 10, wherein the data frame comprises first indication information, and the first indication information included in the data frame if any of the two data frames are the same The same; if the data carried is different, the first indication information included is different.
The network device according to claim 12, wherein the GEM frame and the XGEM frame each include a reserved field, the reserved field includes the first indication information; and the Ethernet frame includes a length/type indication field And a service information field, the length/type indication field is used to indicate a type and/or a length of the service information field, and the service information field includes the first indication information.
The network device according to claim 10, 12 or 13, wherein the data frame comprises second indication information, and the second indication information indicates the N value.
The network device according to claim 14, wherein the GEM frame and the XGEM frame each include a reserved field, and the reserved field includes the second indication information; the Ethernet frame includes a length/type indication field And a service information field, the length/type indication field is used to indicate a type and/or a length of the service information field, and the service information field includes the second indication information.
A network device according to any one of claims 10, 12 to 15, wherein

The transceiver is further configured to receive a data stream;

The processor is further configured to sequentially divide the data stream into a plurality of pieces of data in order;

The processor is specifically configured to generate, according to each of the divided data, N data frames, where each of the N data frames corresponding to each piece of data is generated. Frames carry their corresponding data.
The network device according to claim 16, wherein the data frame further comprises third indication information, the third indication information indicating a location of data carried by the data frame in the data stream.
A network device, where the network device includes:

a processor, configured to monitor a data frame that is sent by the source network device on the preset N channels and carries the same data, where N is an integer greater than or equal to 2;

The processor is further configured to select the data frame transmitted by one of the N channels;

The transceiver is configured to forward the selected data frame;

The source network device is an optical line terminal, and the network device is an optical network unit;

Alternatively, the source network device is an optical network unit, and the network device is an optical line terminal.
The network device according to claim 18, wherein the processor is specifically configured to select the data frame according to a receiving sequence and a frame signal quality of each data frame carrying the same data transmitted on the N channels. .
A network device according to claim 19, wherein

Receiving, in the transceiver, the first of the respective data frames carrying the same data transmitted on the N channels The processor starts timing when the data frame is in progress;

When the timing of the processor reaches a preset duration, the processor is in the first data frame received by the transceiver and the data frame carrying the same data as the first data frame. Select the data frame with the highest frame signal quality.
The network device according to any one of claims 18 to 20, wherein the data frame is a GEM frame or an XGEM frame, or the data frame is an Ethernet frame.
The network device according to any one of claims 18 to 21, wherein the data frame includes third indication information, and the third indication information indicates a location of data carried by the data frame in a data stream;

The processor is further configured to determine, according to the third indication information, a location of each selected data frame in the data stream, where the transceiver is further configured to be in the data stream according to each of the data frames. The location forwards each of the data frames in order.
A passive optical network system, comprising: the network device according to any one of claims 9 to 17, and the network device according to any one of claims 18 to 22. .