WO2017193711A1

WO2017193711A1 - Data transmission method and device

Info

Publication number: WO2017193711A1
Application number: PCT/CN2017/077907
Authority: WO
Inventors: 张伟良
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-05-12
Filing date: 2017-03-23
Publication date: 2017-11-16
Also published as: CN107370688A; CN107370688B

Abstract

Disclosed are a data transmission method and device. The method comprises: a first network node sends first data to be sent to a second network node to the second network node by means of two or more channels evenly, wherein the first network node is an optical line terminal (OLT), and the second network node is an optical network unit (ONU); alternatively, the first network node is an ONU, and the second network is an OLT.

Description

Data transmission method and device

Technical field

The present application relates to, but is not limited to, the field of communications, and more particularly to a data transmission method and apparatus.

Background technique

With the rapid development of broadband services, the demand for access network bandwidth has increased significantly. Passive Optical Network (PON) is an important technical means for user access, as shown in Figure 1. In a PON system, an optical line terminal (Optical Line Terminal, OLT for short) is connected to an optical splitter through a trunk optical fiber, and the optical splitter is connected to a plurality of optical network units (ONUs) through a branch optical fiber. The OLT and ONU communicate through a pair of wavelengths.

NG-PON2 is an important branch in the evolution of PON technology. In NG-PON2, the encapsulation process of data transmission is shown in Figure 2:

The data is first encapsulated into an XGEM (XG-PON Encapsulation Method) frame, and the XGEM frame includes an overhead and a payload, and the XGEM port identifier port ID is carried in the overhead;

Multiple XGEM frames are encapsulated into a superframe. The superframe includes overhead and payload. The overhead includes physical layer operations, management and maintenance (PLOAM) messages, and BWmap (Bandwidth map). Wait;

The superframe is processed into a physical frame by processing such as Forward Error Correction (FEC). The physical frame includes a frame header and a payload, and the frame header is used by the receiver to detect the starting position of the physical frame.

Ethernet Passive Optical Network (EPON)/10GEPON is another important branch of PON evolution. The data encapsulation level is shown in Figure 3. The data is encapsulated into a MAC (Media Access Control) frame, and the data is used as a MAC payload. In addition, the MAC frame also includes a MAC overhead, and the MAC overhead includes information such as a target address, a source address, and a MAC payload length. The MAC frame is encapsulated by encoding, FEC check, etc. The physical frame payload is included in the physical frame, and the physical frame header is included in the physical frame, and the physical frame header includes related information such as delimitation.

In the traditional passive optical network technology, the OLT and the ONU can only communicate through one wavelength pair. That is, the OLT and the ONU can only transmit data through one channel. When the bandwidth requirement of the ONU user side increases, the OLT and the OLT There will be more data to be transmitted before the ONU, and the traditional passive optical network will not be able to meet this demand.

With the further increase in bandwidth requirements and technology development, under the PON network architecture, the OLT and the ONU can support data transmission on multiple channels at the same time, which can increase the bandwidth between the OLT and the ONU, and also increase the ONU user side. bandwidth. As shown in Figure 4.

The ONU supports sending and receiving data on multiple channels. To support this multi-channel transceiver of the ONU, the OLT also needs to support simultaneous transmission and reception of data on multiple channels supported by the ONU.

Summary of invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a data transmission method and device, which can realize the simple and effective simultaneous data transmission between the OLT and the ONU on multiple channels.

According to an embodiment of the present invention, a data transmission method is provided, including: a first network node uniformly transmitting first data to be sent to a second network node to the second network node through two or more channels; The first network node is an optical fiber line terminal OLT, and the second network node is a fiber network unit ONU; or the first network node is an ONU, and the second network node is an OLT.

In an embodiment, the first network node sends the first data to be sent to the second network node to the second network node uniformly through two or more channels, including: the first network The node sends the first data to be sent to the second network node to the second network node uniformly through two or more fixed channels.

In an embodiment, the first network node sends the first data to be sent to the second network node to the second network node uniformly through two or more channels: When the channel includes a logical channel, the first network node uniformly divides the first data into two or more sub-data and respectively encapsulates into a first data frame; the first network node passes the two The above logical channel sends the encapsulated two or more of the first data frames to the second network node; when the channel includes a physical channel, the first network node encapsulates the first data into a first a second data frame; the first network node uniformly divides the second data frame into two or more sub data frames; the first network node passes the two or more parts by using the two or more physical channels A sub-data frame is sent to the second network node.

In an embodiment, the first network node sends the encapsulated two or more first data frames to the second network node by using the two or more logical channels, including: the first network node Assigning more than two of the first data frames to the two or more logical channels in a pre-agreed manner; and, by the two or more logical channels, two or more of the first data frames to be allocated Sending to the second network node; or the first network node adds first identifier information to the two or more first data frames, where the first identifier information is used to identify the a position of the sub data carried in the first data frame in the first data; and two or more of the first data frames to which the first identification information is added are allocated to the two or more logical channels; The two or more logical channels send the allocated two or more of the first data frames to the second network node.

In an embodiment, the sending, by the first network node, the two or more sub-data frames to the second network node by using the two or more physical channels includes: the first network node according to a pre-agreed Transmitting the two or more sub data frames to the two or more physical channels; and transmitting, by the two or more physical channels, the allocated two or more sub data frames to the second a network node; or the first network node adds second identification information to the two or more sub-data frames, where the second identification information is used to identify the sub-data frame in the first data a location in the encapsulated second data frame; assigning the two or more sub-data frames to which the second identification information is added to the two or more physical channels; allocating through the two or more physical channels The two or more sub data frames are sent to the second network node.

In an embodiment, the first network node encapsulating the first data into the second data frame comprises: the first network node encapsulating the first data into the second data frame a payload portion; the first network node uniformly dividing the second data frame into two or more sub data frames, the first network node uniformly dividing a payload portion of the second data frame Transmitting into more than two sub-data frame payloads; the first network node transmitting the two or more sub-data frames to the second network node by using the two or more physical channels, including: the first network The node encapsulates the two or more sub-data frame payloads into the two or more physical channels; the first network node sends the two or more sub-data frame payloads by using the two or more physical channels Transmitting to the second network node, and informing the second network node of the starting position of the sub data frame payload in the physical channel by at least one of: the first network node is in the Inserting a frame start position of two or more physical channels, wherein the frame header is used to identify a start position of the sub data frame payload in the physical channel; the first network node and the Second network node convention a starting position of the sub-data frame payload in the physical channel; the first network node agrees with the second network node or notifies the second network node of the sub-data frame in the physical channel The start position of the load is the same as the start position of the sub data frame payload in the physical channel when the first network node performs data transmission to the second network node, where the first network node periodically The frame header is inserted at a frame start position of two or more physical channels, wherein the frame header is used to identify a start position of a sub data frame payload in the physical channel.

In an embodiment, the first network node receives second data from the second network node through more than two channels, wherein the second data is uniformly transmitted in the two or more channels.

In an embodiment, the receiving, by the first network node, the second data from the second network node by using two or more channels includes:

The first network node receives the second data from the second network node through two or more fixed channels.

In an embodiment, the receiving, by the first network node, the second data from the second network node by using the two or more channels includes: when the channel includes a logical channel, the first network node Receiving more than two third data frames from the second network node by the two or more channels; the first network node determining that the sub data included in the two or more third data frames are in the The position in the second data, and each sub-data according to the determined position Obtaining the second data after the assembly; when the channel includes a physical channel, the first network node receives more than two sub-data frames from the second network node by using the two or more channels, where The sub data frame is a part of a fourth data frame encapsulated by the second data; the first network node determines a fourth data frame in which the two or more sub data frames are encapsulated in the second data a position in the middle, and assembling each sub-data frame according to the determined position to obtain a fourth data frame encapsulated by the second data; the first network node is encapsulated into a fourth data frame from the second data Obtaining the second data.

In an embodiment, the determining, by the first network node, the location of the sub-data included in the two or more third data frames in the second data comprises: the first network node according to a pre-agreed manner Determining a position of the sub data included in the two or more third data frames in the second data; or, the first network node acquiring a third carried in the two or more third data frames And identifying, by the first network node, a location of the sub data included in the two or more third data frames in the second data according to the third identifier information.

In an embodiment, the determining, by the first network node, the location of the two or more sub-data frames in the fourth data frame encapsulated by the second data comprises: the first network node according to a pre-agreed The method determines a location of the two or more sub data frames in a fourth data frame encapsulated by the second data; or, the first network node acquires a number carried in the two or more sub data frames And determining, by the first network node, a location of the two or more sub data frames in a fourth data frame encapsulated by the second data according to the fourth identifier information.

In an embodiment, the receiving, by the first network node, the two or more sub-data frames from the second network node by using the two or more channels, that the first network node is determined by at least one of the following manners: a starting position of the sub-data frame payload in the two or more channels: determining, according to a frame start position of the two or more channels, a sub-data frame payload in the two or more channels The manner of the frame header of the starting position; the manner of arranging the starting position of the sub-data frame payload in the physical channel with the second network node; by agreeing with the second network node or by Notifying the second network node of a start location of the sub-data frame payload in the physical channel and a sub-data frame in a physical channel when the second network node previously performs data transmission to the first network node a manner in which the start position of the payload is the same, wherein the second network node periodically inserts a frame header at a frame start position of two or more physical channels, The frame header is used to identify a start position of a sub data frame payload in the physical channel; according to the determined start position of the sub data frame payload in the two or more channels from the two More than two sub-data frame payloads from the second network node are determined in the above channels.

According to another embodiment of the present invention, a data transmission method is provided, including: a first network node receives second data from a second network node through two or more channels, wherein the second data is in the two Uniformly transmitted in more than one channel; wherein the first network node is a fiber line terminal OLT, the second network node is a fiber network unit ONU; or the first network node is an ONU, and the second network node For the OLT.

In an embodiment, the receiving, by the first network node, the second data from the second network node by using two or more channels includes: receiving, by the first network node, by using two or more fixed channels The second data of the second network node.

In an embodiment, the receiving, by the first network node, the second data from the second network node by using the two or more channels includes: when the channel includes a logical channel, the first network node Receiving more than two third data frames from the second network node by the two or more channels; the first network node determining that the sub data included in the two or more third data frames are in the a location in the second data, and assembling the sub-data according to the determined location to obtain the second data; when the channel includes a physical channel, the first network node receives the source through the two or more channels Two or more sub-data frames of the second network node, wherein the sub-data frame is part of a fourth data frame encapsulated by the second data; the first network node determines the two or more a position of the sub-data frame in the fourth data frame encapsulated by the second data, and assembling each sub-data frame according to the determined position to obtain a fourth data frame encapsulated by the second data; A first network node to a second data package from the fourth data frame to acquire the second data.

According to another embodiment of the present invention, there is provided a data transmission apparatus, the apparatus being applied to a first network node, comprising: a sending module, configured to uniformly pass first data to be sent to a second network node The two or more channels are sent to the second network node; wherein the first network node is a fiber line terminal OLT, the second network node is a fiber network unit ONU; or the first network node is an ONU, The second network node is an OLT.

In an embodiment, the device further includes: a receiving module, configured to pass more than two passes The track receives second data from the second network node, wherein the second data is uniformly transmitted in the two or more channels.

According to an embodiment of the present invention, there is provided a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the data transfer method described above.

Through the above steps, since there are more than two channels for data transmission between the OLT and the ONU, when data is transmitted between the OLT and the ONU, data can be transmitted by using more than two channels at the same time, and since the data is in two Uniform transmission in more than one channel ensures that one end of the received data receives the complete data (ie, determines that the received data at the same time (or less than a predetermined time) comes from the same network node, ensuring the integrity of the received data. ). The solution in the embodiment of the present invention can simultaneously and efficiently transmit data on multiple channels, thereby ensuring data integrity.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of a PON architecture and topology;

2 is a schematic diagram of NG-PON2 data encapsulation;

3 is a schematic diagram of EPON/10GEPON data encapsulation;

4 is a schematic diagram of a multi-path PON architecture and topology;

FIG. 5 is a flowchart of a data transmission method according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of data transmission according to Embodiment 1 of the present invention; FIG.

7 is a schematic diagram 1 of data transmission according to Embodiment 2 of the present invention;

FIG. 8 is a second schematic diagram of data transmission according to Embodiment 2 of the present invention; FIG.

9 is a first schematic diagram of data encapsulation according to a third embodiment of the present invention;

FIG. 10 is a second schematic diagram of data encapsulation according to Embodiment 3 of the present invention; FIG.

11 is a block diagram showing the structure of a data transmission device according to an embodiment of the present invention.

Detailed

The present application will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or order.

The ONU supports sending and receiving data on multiple channels. The OLT supports simultaneous transmission and reception of data on multiple channels supported by the ONU in order to support such multi-channel transmission and reception of the ONU.

FIG. 5 is a flowchart of a data transmission method according to an embodiment of the present invention. As shown in FIG. 5, the process includes the following steps:

Step S502, the first network node sends the first data to be sent to the second network node to the second network node uniformly through two or more channels;

The first network node is a fiber line terminal OLT, and the second network node is a fiber network unit ONU; or the first network node is a fiber network unit ONU, and the second network node is a fiber line terminal OLT.

The data transmission method may further include: step S504, the first network node receives the second data from the second network node by using two or more channels, wherein the second data is uniformly transmitted in the two or more channels;

The step S504 may exist separately or may exist simultaneously with the step S502, and the two steps are not in the order. Through the above steps, since there are more than two channels for data transmission between the OLT and the ONU, when data is transmitted between the OLT and the ONU, data can be transmitted by using more than two channels at the same time, and since the data is in two Uniform transmission in more than one channel ensures that one end of the received data receives the complete data (ie, determines that the received data at the same time (or less than a predetermined time) comes from the same network node, ensuring the integrity of the received data. ). Compared with the manner of transmitting data in the related art, the solution in the embodiment of the present invention can simultaneously and efficiently transmit and/or receive data on multiple channels, thereby ensuring data integrity.

The following describes how to use multiple channels for data transmission between the first network node and the second network node:

In an embodiment, the first network node sends the first data to be sent to the second network node to the second network node uniformly through two or more channels, where the first network node is to be sent to the second network. The first data of the node is sent to the second network node uniformly through the fixed two or more channels.

In an embodiment, the receiving, by the first network node, the second data from the second network node by using the two or more channels, the first network node receiving the second data from the second network node by using the fixed two or more channels. . In this embodiment, the channel for data transmission between the first network node and the second network node may be a fixed channel, and the fixed channel may be determined by negotiation between the two parties, or may be pre-configured or protocol. The rules are good.

In an embodiment, in the foregoing step S502, when the first network node sends the first data to be sent to the second network node to the second network node through two or more channels, the method may be implemented as follows: When the channel includes a logical channel (for example, a logical channel such as an XGEM port), the first network node uniformly divides the first data into two or more sub-data and respectively encapsulates the first data frame; the first network node passes two or more The logical channel sends the encapsulated two or more first data frames to the second network node. In this embodiment, when the first network node sends the encapsulated two or more first data frames through two or more logical channels, there may be multiple transmission modes, and one transmission mode is: one-to-one transmission. That is, each data frame is sent through different logical channels, and all data frames encapsulated are simultaneously transmitted, so that all data frames can be simultaneously sent to the second network node side; one transmission mode is many-to-one transmission, That is, multiple data frames are sent on one logical channel, and the number of data frames sent on each logical channel is the same. For example, M data frames are transmitted on M/2 logical channels, and each logical channel carries 2 Data frames can be cyclically allocated to carry multiple data frames on a logical channel. Other examples can be used. For example, four data frames are transmitted on two logical channels, and the first data frame is in logic. Transmitted on channel 1, the second data frame is sent on logical channel 2, the third data frame is sent on logical channel 1, and the fourth data frame is sent on logical channel 2.

In an embodiment, in the foregoing step S502, when the first network node sends the first data to be sent to the second network node to the second network node through two or more channels, the method may also be implemented as follows: When the above channel includes a physical channel, the first network node will be the first One data is encapsulated into a second data frame (ie, a physical frame); the first network node evenly divides the second data frame into two or more sub data frames; the first network node passes two copies through the two or more physical channels The above sub data frame is sent to the second network node. In this embodiment, when two or more sub-data frames are transmitted through two or more physical channels, resource allocation may be determined according to the number of sub-data frames, and multiple sub-data frames may be carried in physical by cyclic allocation. The transmission is performed on the channel. For example, when the number of physical channels is 4 and the number of divided sub-data frames is Q, the first to fourth sub-data frames of the Q may be carried in the first to fourth respectively. The physical channel is transmitted, and the 5th to 8th sub-data frames are carried on the 1st to 4th physical channels for transmission, and so on.

In an embodiment, when the first network node sends the encapsulated two or more first data frames to the second network node by using two or more logical channels, the following manner may be adopted: the first network node is pre-agreed Manipulating two or more first data frames into two or more logical channels; and transmitting two or more first data frames allocated to the second network node through two or more logical channels; or, the first network The node adds the first identifier information to the two or more first data frames, where the first identifier information is used to identify the location of the child data carried in the first data frame in the first data; the first identifier is added Two or more first data frames of information are allocated to more than two logical channels; two or more first data frames allocated by the two or more logical channels are sent to the second network node. In this embodiment, the pre-agreed manner may be a manner in which the first network node and the second network node negotiate, or a manner specified by the protocol, or a fixed configuration manner, for example, the first logical channel may be agreed to be sent. The first data frame of the two or more first data frames, and the second data frame of the second logical channel, ..., so that when the second network node receives the data frame through the logical channel, it can determine more The positional relationship of the sub-data carried in the first data frame, thereby obtaining complete and correct data. In this embodiment, the location of the sub-data carried in the first data frame may be determined by using the identifier information, for example, when the identifier information is 00, indicating that the sub-data carried in the data frame is the first data. The sub-data of the first part of the middle, when the identification information is 01, indicates that the sub-data carried in the data frame is the sub-data of the second part in the first data, and so on.

In an embodiment, when the first network node sends more than two sub-data frames to the second network node by using two or more physical channels, the following manner may be adopted: Assigning more than two sub-data frames to more than two physical channels in a pre-agreed manner; and transmitting more than two sub-data frames allocated to the second network node through the two or more physical channels; or The first network node adds the second identifier information to the two or more sub-data frames, where the second identifier information is used to identify the location of the sub-data frame in the second data frame encapsulated by the first data. Two or more sub-data frames to which the second identification information is added are allocated to two or more physical channels; and the two or more sub-data frames allocated by the two or more physical channels are transmitted to the second network node. Similar to the foregoing embodiment, in this embodiment, the allocation of the sub-data frames may also be performed in an agreed manner or in a manner of identifying the identification information.

In an embodiment, the foregoing first network node encapsulating the first data into the second data frame includes: the first network node encapsulates the first data into a payload portion of the second data frame; the first network node uses the second data Uniformly dividing the frame into two or more sub-data frames includes: the first network node uniformly splits the payload portion of the second data frame into two or more sub-data frame payloads; the first network node passes two The sending, by the physical channel, the two or more sub-data frames to the second network node includes: the first network node encapsulating more than two sub-data frame payloads into two or more physical channels; the first network node passes two or more The physical channel sends more than two sub-data frame payloads to the second network node, and informs the second network node of the starting position of the sub-data frame payload in the physical channel by at least one of the following manners: The network node inserts a frame header at a frame start position of two or more physical channels, where the frame header is used to identify a start position of a sub data frame payload in the physical channel; the first network section Determining, with the second network node, a starting location of the sub-data frame payload in the physical channel; the first network node agrees with the second network node or notifies the second network node of the starting position of the sub-data frame payload in the physical channel The start position of the sub data frame payload in the physical channel when the first network node previously performs data transmission to the second network node, wherein the first network node periodically starts from the frame of the two or more physical channels The start position is inserted into the frame header, wherein the frame header is used to identify the start position of the sub data frame payload in the physical channel. In this embodiment, when the first data is encapsulated into the payload portion of the data frame, the frame header of the data frame may not be needed, and only the payload portion may be encapsulated. Moreover, in the present embodiment, a frame header can be inserted at the beginning of each physical channel (the data header can be inserted every time the data is transmitted, or can be periodically inserted, and the physical time of each data transmission is performed. The start position of the sub-data frame payload in the channel is the same), so that the receiver (ie, the second network node) can be made to physical The header inserted in the channel finds the starting position of the sub-data frame in each channel (when the first network node periodically inserts the frame header, the second network node can determine the above-mentioned frame header inserted on the previous physical channel) Start position), thus splicing into complete data.

The foregoing embodiments are mainly directed to how the first network node sends data to the second network node, and how the first network node receives data from the second network node is described below:

In an embodiment, in the foregoing step S504, when the first network node receives the second data from the second network node by using two or more channels, the following manner may be adopted: when the channel includes the logical channel, the first network node Receiving two or more third data frames from the second network node through the two or more channels; the first network node determining a location of the data included in the two or more third data frames in the second data, and according to The determined location obtains the second data after assembling each sub-data; and the second data from the second network node may also be received through two or more channels in the following manner: when the channel includes the physical channel, the first network node passes two More than two channels receive more than two sub-data frames from the second network node, wherein the sub-data frame is part of a fourth data frame (ie, a physical frame) encapsulated by the second data; the first network node determines the foregoing The position of the two or more sub data frames in the fourth data frame encapsulated by the second data, and each sub data according to the determined position Obtain a second encapsulated data is assembled into a fourth data frame; a first network node acquires second data from the second data encapsulated into a fourth data frame.

In an embodiment, the determining, by the first network node, the location of the sub-data included in the two or more third data frames in the second data comprises: determining, by the first network node, the two or more thirds in a predetermined manner Position of the sub-data included in the data frame in the second data; or, the first network node acquires the third identifier information carried in the two or more third data frames; the first network node determines two according to the third identifier information The position of the sub data contained in the third data frame above in the second data. In this embodiment, when the third network node sends the third data frame by using the channel, the second network node may send the information in the agreed manner, or may carry the identifier information for identifying the location information in the sent third data frame. The first network node is informed of the sequence of each third data frame, so that the first network node determines the order of the data in each third data frame, thereby obtaining complete and accurate data.

In one embodiment, the first network node determines that more than two sub-data frames are in the second The location in the fourth data frame encapsulated by the data includes: determining, by the first network node, a location of the two or more sub data frames in the fourth data frame encapsulated by the second data according to a pre-agreed manner; or, the first network The node acquires the fourth identifier information carried in the two or more sub-data frames; the first network node determines, according to the fourth identifier information, the position of the two or more sub-data frames in the fourth data frame encapsulated by the second data. In this embodiment, when the second network node sends the sub-data frame by using the channel, the second network node may send the information according to the agreed manner, or may send the identifier information for identifying the location information in the sent sub-data frame to notify the first The sequence of each sub-data frame of a network node, so that the first network node determines the sequence of data in each sub-data frame, thereby obtaining complete and accurate data.

In an embodiment, the receiving, by the first network node, the two or more sub-data frames from the second network node by using the two or more channels includes: determining, by the first network node, at least one of the two or more channels Start position of the sub data frame payload: a manner of inserting a frame header for determining a start position of a sub data frame payload in two or more channels according to a frame start position of the above two or more channels; The manner in which the foregoing second network node appoints the start position of the sub-data frame payload in the physical channel; by agreeing with the second network node or by the second network node, notifying the start position of the sub-data frame payload in the physical channel a manner in which the start position of the sub data frame payload in the physical channel when the second network node performs data transmission to the first network node is the same, wherein the second network node periodically frames on more than two physical channels The start position is inserted into a frame header, where the frame header is used to identify a start position of a sub data frame payload in the physical channel; Starting position of the data sub-frame payload determined two or more sub-frame payload data from the second network node from two or more channels. In this embodiment, a frame header for determining a start position of a sub data frame payload may be inserted in a frame start position of each channel, or the frame header may be periodically inserted, and the first network node may The starting position of the sub data frame payload is determined according to the frame header.

It can be seen from the above embodiment that between the OLT and the ONU, data frames or data are uniformly transmitted and received through a plurality of fixed channels. The channel may be a logical channel such as an XGEM port, or may be a physical channel such as a wavelength. When the channel is a logical channel such as XGEM Port, the data is uniformly transmitted and received through a plurality of fixed logical channels; when the channel is a physical channel such as a wavelength, the data is first encapsulated into a data frame, and the data frame is fixed in multiple physical Uniformly on the channel Send and receive. In the uplink direction, the bandwidth allocated by the OLT to the ONU can be evenly distributed on multiple fixed channels.

First, the case where the channel includes the physical channel is described in conjunction with the first embodiment and the second embodiment:

Embodiment 1

In this embodiment, the OLT and the ONU support 4 channels as an example. After the data is encapsulated and a physical frame is formed (corresponding to the second data frame), the physical frame can be equally divided into 4×N parts. Divided into 4 × N parts, supplemented by 4 × N parts by adding missing parts, and then distributed each part to 4 physical channels in block order, for example, the first part is sent in channel 1, the second part is in Channel 2 is transmitted, the third part is transmitted on channel 3, the fourth part is transmitted on channel 4, the fifth part is transmitted on channel 1, the sixth part is transmitted on channel 2, the seventh part is transmitted on channel 3, and the eighth part is transmitted on channel 3, and the eighth part is in channel 4. Send, and so on. The receiving party (when the sending party is the OLT, the receiving party is the ONU; when the sending party is the ONU, the receiving party is the OLT), each channel data is received in four parts and four parts in the channel order, and then the physical frame header is searched. Parse the physical frame payload. Figure 6 shows an example in which one physical frame is divided into four blocks, which are transmitted and received on four channels, respectively.

As shown in Figure 6, the ITU-T (International Telecommunications Union-Telecommunications Standardization Sector) package, data transmission and reception as an example, each data is first encapsulated into XGEM frames, each data as XGEM payload Encapsulation, and then each XGEM frame is encapsulated into a superframe as a superframe payload, and the superframe is subjected to FEC and other related processing, and then encapsulated into a physical frame as a physical frame payload, and the physical frame is divided into 4 sub-physical frames (corresponding to the above Subdata frames) are sent on channels 1, 2, 3, and 4, respectively. The receiver extracts the same size sub-physical frame at the same position of the channels 1, 2, 3, and 4 respectively. According to the transmission rule, the sub-physical frame taken out from the channel 1 is placed at the forefront, and the sub-physical frame taken from the channel 2 is placed. In the second position, the sub-physical frame taken out from channel 3 is placed in the third position, and the sub-physical frame taken out from channel 4 is placed at the end to form a completed physical frame, the physical frame header is checked, and the physical frame payload and the super-resolution are sequentially analyzed. Frame payload, XGEM payload until the data is parsed.

Embodiment 2

In this embodiment, the OLT and the ONU support 4 channels as an example. After the data is encapsulated and a physical frame is formed (corresponding to the second data frame), the physical frame can be equally divided into 4×N parts. Divided into 4 × N parts, can be supplemented by 4 × N parts by adding missing parts, and then allocated each part to 4 physical channels in block order, inserting physics at the beginning of the sub-physical frame of each channel The frame header (corresponding to the above-mentioned frame header), for example, the first part is transmitted on channel 1, the second part is transmitted on channel 2, the third part is transmitted on channel 3, the fourth part is transmitted on channel 4, and the fifth part is transmitted on channel 4. Send, the sixth part is sent on channel 2, the seventh part is sent on channel 3, the eighth part is sent on channel 4, and so on. The receiver (when the sender is the OLT, the receiver is the ONU; when the sender is the ONU, the receiver is the OLT), as long as the physical frame header is found on each channel, the sub-physical frame start in each channel can be found. After the sub-physical frames are spliced, the starting position of the entire physical frame can be obtained. The physical frame header of the original physical frame is actually unnecessary, and the physical frame header of the original physical frame is still possible. After the physical frame is spliced, the physical frame header can be searched like the receiver in the first embodiment.

As shown in FIG. 7 , taking ITU-T encapsulation and data transceiving as an example, each data is first encapsulated into an XGEM frame, and each data is encapsulated as an XGEM payload, and then each XGEM frame is encapsulated into a superframe as a superframe payload. The super frame is encapsulated into a physical frame as a physical frame payload after performing related processing such as FEC. In this embodiment, the physical frame is not added with a physical frame header, and the physical frame is divided into 4 sub-physical frames, respectively, in channels 1, 2, respectively. 3, 4 send, and add a physical frame header before each sub-physical frame. The receiver detects the physical frame header on the channels 1, 2, 3, and 4 respectively, and extracts the sub-physical frame of the same size when the physical frame header is detected. According to the transmission rule, the sub-physical frame taken out from the channel 1 is placed at the forefront, and the slave channel is placed at the forefront. 2 The extracted sub-physical frame is placed in the second position, the sub-physical frame taken out from channel 3 is placed in the third position, and the sub-physical frame taken out from channel 4 is placed at the end to form a completed physical frame, and the physical frame payload is parsed. Superframe payload, XGEM payload until the data is parsed.

As shown in FIG. 8 , an IEEE (Institute of Electrical and Electronics Engineers) package and data transmission and reception is taken as an example. Each data is first encapsulated into a MAC (Media Access Control) frame. The data is encapsulated as a MAC payload, and then each MAC frame is subjected to FEC and other related processing and then encapsulated into a physical frame as a physical frame payload. In this embodiment, a physical frame is not added to the physical frame, and the physical frame is divided into 4 sub-physical frames, which are sent on channels 1, 2, 3, and 4, respectively, and physical frames are added before each sub-physical frame. head. The receiver detects the physical frame header on the channels 1, 2, 3, and 4 respectively, and extracts the sub-physical frame of the same size when the physical frame header is detected. According to the transmission rule, the sub-physical frame taken out from the channel 1 is placed at the forefront, and the slave channel is placed at the forefront. 2 The extracted sub-physical frame is placed in the second position, the sub-physical frame taken out from channel 3 is placed in the third position, and the sub-physical frame taken out from channel 4 is placed at the end to form a completed physical frame, and the physical frame payload is parsed. MAC payload until the data is parsed.

The following describes the case when the channel includes the logical channel in combination with the third embodiment and the fourth embodiment: the data/management frame can be evenly distributed into multiple fixed logical channels such as XGEM Port to form logical channel encapsulation frames, each logic. The channel encapsulation frames independently enter their respective physical frames for transmission and reception processing.

Embodiment 3

In this embodiment, taking 2 channels between the OLT and the ONU as an example, the data is equally divided into 2 sub-data, and each sub-data tag is added to represent the relationship between each sub-data and data, respectively, through 2 The logical channel is encapsulated and transmitted, and the receiving end (corresponding to the above-mentioned receiver) solves the payload of the encapsulated frame of the two channels, and then reassembles according to the mark.

As shown in FIG. 9 , taking ITU-T encapsulation and data transceiving as an example, each data is equally divided into 2 sub-data according to the number of logical channels XGEM Port, and respectively sent in two logical channels XGEM Port, and each packaged into XGEM frames, each sub-data is encapsulated as an XGEM payload, and then each XGEM frame is encapsulated into a superframe as a superframe payload, and the superframe is subjected to FEC and other related processing, and then encapsulated into a physical frame as a physical frame payload, respectively in channel 1. , 2 sent. The receiver extracts the physical frame on the channels 1, 2, checks the physical frame header according to the sending rule, and sequentially parses the physical frame payload, the superframe payload, and the XGEM payload until the data is parsed, and parses the XGEM frame and its net. When it comes to time, check its markup and recombine the relevant subdata into complete data.

As shown in FIG. 10, taking IEEE encapsulation and data transceiving as an example, each piece of data is equally divided into 2 sub-data according to the number of logical channel LLIDs (Logical Link Identifiers), and is respectively in two logical channels LLID. In the middle, each packet is encapsulated into a MAC frame, and each sub-data is encapsulated as a MAC payload, and then each MAC frame is encapsulated into a superframe as a superframe payload, and the superframe is subjected to FEC and other related processing and then encapsulated into a physical frame payload as a physical payload. Frames are sent on channels 1, 2 respectively. The receiver takes physical frames on channels 1, 2 and checks them according to the sending rules. Physical frame header, and parse the physical frame payload and MAC payload in turn until the data is parsed. When parsing the XGEM frame and its payload, check the tag and reorganize the relevant sub-data to form complete data.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform, or by hardware, but in many cases, the former is more Good implementation. Based on the understanding, the technical solution of the embodiment of the present invention may be embodied in the form of a software product stored in a storage medium (such as a ROM/RAM, a magnetic disk, an optical disk), and includes a plurality of instructions for making a A terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) performs the method described in each embodiment of the present invention.

In the embodiment, a data transmission device is also provided, which is used to implement the foregoing embodiments and implementation manners, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the devices described in the following embodiments may be implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

11 is a structural block diagram of a data transmission apparatus according to an embodiment of the present invention. The apparatus may be applied to a first network node. As shown in FIG. 11, the apparatus includes a transmitting module 112 and/or a receiving module 114. The device is described.

The sending module 112 is configured to send the first data to be sent to the second network node to the second network node through two or more channels uniformly;

The receiving module 114 is configured to receive second data from the second network node by using two or more channels, where the second data is uniformly sent in more than two channels;

In an embodiment, the sending module 112 may send the first data to be sent to the second network node to the second network node uniformly through two or more channels by using: The first data to be sent to the second network node is sent to the second network node uniformly through the fixed two or more channels. In another embodiment, the receiving module 114 may receive the second data from the second network node by receiving the second data from the second network node through the fixed two or more channels. In this embodiment, the channel for data transmission between the first network node and the second network node may be a fixed channel, and the fixed channel may be determined by negotiation between the two parties, or may be pre-configured or protocol. The rules are good.

In an embodiment, the sending module 112 may send the first data to be sent to the second network node to the second network node uniformly through two or more channels by using the following manner: when the channel includes the logical channel, The data is evenly divided into two or more sub-data and respectively encapsulated into a first data frame; the encapsulated two or more first data frames are sent to the second network node through two or more logical channels; when the channel includes In the physical channel, the first data is encapsulated into a second data frame; the second data frame is evenly divided into two or more sub data frames; and two or more sub data frames are sent to the first through the two or more physical channels Two network nodes.

In an embodiment, the sending module 112 may send the encapsulated two or more first data frames to the second network node by using two or more logical channels by using two or more pre-agreed manners. One data frame is allocated to more than two logical channels; and two or more first data frames allocated are transmitted to the second network node through two or more logical channels; or, in two or more first data frames Adding first identifier information, where the first identifier information is used to identify a location of the child data carried in the first data frame in the first data; and to allocate two or more first data frames to which the first identifier information is added And to two or more logical channels; and the two or more first data frames allocated by the two or more logical channels are sent to the second network node.

In an embodiment, the sending module 112 may send more than two sub-data frames to the second network node by using two or more physical channels by: allocating more than two sub-data frames to the pre-agreed manner. And transmitting the two or more sub-data frames allocated to the second network node by using the two or more physical channels; or adding the second identification information to the two or more sub-data frames The second identification information is used to identify a position of the sub data frame in the second data frame encapsulated by the first data; and to allocate two or more sub data frames to which the second identification information is added to two or more Physical channel More than two sub-data frames allocated are sent to the second network node through the above two physical channels.

In an embodiment, the sending module 112 may encapsulate the first data into a second data frame by encapsulating the first data into a payload portion of the second data frame. The sending module 112 may use the following manner. The second data frame is evenly divided into two or more sub data frames: the payload portion of the second data frame is evenly divided into two or more sub data frame payloads; and the sending module 112 can pass the following two ways. More than one physical channel sends more than two sub-data frames to the second network node: the above two or more sub-data frame payloads are encapsulated into two or more physical channels; more than two of the above two physical channels are used Transmitting the sub-data frame payload to the second network node, and informing the second network node of the starting position of the sub-data frame payload in the physical channel by at least one of: starting at a frame of two or more physical channels Position inserting a frame header, wherein the frame header is used to identify a start position of a sub data frame payload in the physical channel; and a physical channel is agreed with the second network node a starting position of the sub-data frame payload; agreeing with the second network node or notifying the second network node of the starting position of the sub-data frame payload in the physical channel and transmitting data to the second network node before the first network node The start position of the sub data frame payload in the physical channel is the same, wherein the first network node periodically inserts a frame header at a frame start position of two or more physical channels, where the frame header is used for identification The starting position of the subdata frame payload in the physical channel.

In an embodiment, the receiving module 114 may receive second data from the second network node through two or more channels by receiving the logical channel from the second network node when the channel includes the logical channel. Two or more third data frames; determining a position of the data contained in the two or more third data frames in the second data, and assembling each sub data according to the determined position to obtain second data; When the physical channel is included, the two or more sub-data frames from the second network node are received by the two or more channels, wherein the sub-data frame is a part of the fourth data frame encapsulated by the second data; determining the two copies The position of the above sub data frame in the fourth data frame encapsulated by the second data, and assembling each sub data frame according to the determined position to obtain a fourth data frame encapsulated by the second data; The second data is acquired in the fourth data frame.

In an embodiment, the receiving module 114 can determine more than two by using the following manners. Position of the sub data included in the third data frame in the second data: determining the position of the sub data included in the two or more third data frames in the second data in a predetermined manner; or, acquiring the above two And third identifier information carried in the third data frame; determining, according to the third identifier information, a position of the sub data included in the two or more third data frames in the second data.

In an embodiment, the receiving module 114 may determine the position of the two or more sub data frames in the fourth data frame encapsulated by the second data by determining two or more sub data frames according to a predetermined manner. a position in the fourth data frame encapsulated by the second data; or acquiring fourth identification information carried in the two or more sub data frames; determining, by the fourth identification information, that the two or more sub data frames are in the The location in the fourth data frame encapsulated by the second data.

In an embodiment, the receiving module 114 may receive more than two sub-data frames from the second network node by using the two or more channels: determining, by at least one of the foregoing two or more channels The start position of the data frame payload: a manner of inserting a frame header for determining a start position of a sub data frame payload in more than two channels according to the frame start positions of the above two or more channels; The manner in which the second network node stipulates the start position of the sub-data frame payload in the physical channel; by agreeing with the second network node or by the second network node notifying the start position of the sub-data frame payload in the physical channel a manner in which the start position of the sub data frame payload in the physical channel when the second network node performs data transmission to the first network node is the same, wherein the second network node periodically starts from the frame of the two or more physical channels Inserting a frame header, wherein the frame header is used to identify a starting position of a sub-data frame payload in the physical channel; two or more channels according to the determination Start position determination sub-data frame payload of two or more sub-frame payload data from the second network node from two or more channels.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination. The forms are located in different processors.

Embodiments of the present invention also provide a storage medium. In this embodiment, the above storage medium may be configured to store program code for performing the following steps:

S1. The first network node sends the first data to be sent to the second network node to the second network node uniformly through two or more channels; and/or,

S2. The first network node receives the second data from the second network node by using the two or more channels, where the second data is uniformly sent in the two or more channels, where the first network node is the optical fiber line terminal OLT. The second network node is a fiber network unit ONU; or the first network node is a fiber network unit ONU, and the second network node is a fiber line terminal OLT.

In this embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

In the present embodiment, the processor executes the above steps in accordance with the program code already stored in the storage medium.

For examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and implementation manners, and details are not described herein again.

The modules or steps of the above embodiments of the present invention may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices, which may be implemented by computing devices. The executed program code is implemented such that they can be stored in a storage device by a computing device, and in some cases, the steps shown or described can be performed in a different order than here, or they can be Each of the integrated circuit modules is fabricated separately, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

The above description is only for the embodiments of the present invention, and is not intended to limit the present application, and various changes and modifications may be made by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application are intended to be included within the scope of the present application.

Industrial applicability

In the implementation of the present invention, since there are more than two channels for data transmission between the OLT and the ONU, when data is transmitted between the OLT and the ONU, more than two channels can be utilized at the same time. The channel transmits data, and since the data is uniformly transmitted in more than two channels, it can be ensured that one end of the received data receives the complete data (ie, it is determined that the data received at the same time (or less than a predetermined time) comes from the same network. The node guarantees the integrity of the received data). The solution in the embodiment of the present invention can simultaneously and efficiently transmit data on multiple channels, thereby ensuring data integrity.

Claims

A data transmission method includes:

The first network node sends the first data to be sent to the second network node to the second network node uniformly through two or more channels;

The first network node is an optical fiber line terminal OLT, and the second network node is a fiber network unit ONU; or the first network node is an ONU, and the second network node is an OLT.
The method of claim 1 wherein

Transmitting, by the first network node, the first data to be sent to the second network node to the second network node by using two or more channels: the first network node is to be sent to the The first data of the second network node is sent to the second network node uniformly through two or more fixed channels.
The method according to claim 1 or 2, wherein the first network node transmits the first data to be sent to the second network node to the second network node uniformly through two or more channels. include:

When the channel includes a logical channel, the first network node uniformly divides the first data into two or more sub-data and respectively encapsulates into a first data frame; the first network node passes the two And more than one logical channel sends the encapsulated two or more of the first data frames to the second network node;

When the channel includes a physical channel, the first network node encapsulates the first data into a second data frame; the first network node evenly divides the second data frame into two or more sub-children a data frame; the first network node sends the two or more sub data frames to the second network node by using the two or more physical channels.
The method of claim 3, wherein the transmitting, by the first network node, the encapsulated two or more of the first data frames to the second network node by using the two or more logical channels comprises:

The first network node allocates more than two of the first data frames to the two or more logical channels in a pre-agreed manner; and, through the two or more logical channels Transmitting two or more of the first data frames to the second network node; or

The first network node adds the first identifier information to the two or more first data frames, where the first identifier information is used to identify the child data carried in the first data frame. Locating a location in the first data; assigning more than two of the first data frames to which the first identification information is added to the two or more logical channels; two of the two or more logical channels to be allocated The above first data frame is sent to the second network node.
The method of claim 3, wherein the transmitting, by the first network node, the two or more sub-data frames to the second network node by using the two or more physical channels comprises:

The first network node allocates the two or more sub-data frames to the two or more physical channels in a pre-agreed manner; and, the two or more copies to be allocated by the two or more physical channels a sub-data frame is sent to the second network node; or

The first network node adds second identification information to the two or more sub-data frames, where the second identification information is used to identify that the sub-data frame is encapsulated in the first data. a location in the two data frames; allocating the two or more sub-data frames to which the second identification information is added to the two or more physical channels; the two copies to be allocated by the two or more physical channels The above sub data frame is sent to the second network node.
The method according to claim 3 or 5, wherein

Encapsulating the first data into the second data frame by the first network node includes: the first network node encapsulating the first data into a payload portion of the second data frame;

The first network node uniformly dividing the second data frame into two or more sub data frames includes: the first network node uniformly splits a payload portion of the second data frame into two or more parts Child data frame payload;

Sending, by the first network node, the two or more sub data frames to the second network node by using the two or more physical channels, that: the first network node, the two or more sub data frames The payload is encapsulated into the two or more physical channels; the first network node sends the two or more sub-data frame payloads to the second network node through the two or more physical channels, and passes At least one of the following manners is to inform the second network node of the starting position of the sub-data frame payload in the physical channel:

The first network node inserts a frame header at a frame start position of the two or more physical channels, where the frame header is used to identify a start position of the sub data frame payload in the physical channel;

The first network node and the second network node stipulate a starting position of the payload of the sub-data frame in the physical channel;

The first network node and the second network node agree or notify the second network node that the starting position of the sub-data frame payload in the physical channel is forwarded to the first network node The start position of the sub data frame payload in the physical channel when the second network node performs data transmission is the same, wherein the first network node periodically inserts a frame header at a frame start position of two or more physical channels. The frame header is used to identify a starting position of a sub data frame payload in the physical channel.
The method of claim 1 further comprising:

The first network node receives second data from the second network node through two or more channels, wherein the second data is uniformly transmitted in the two or more channels.
The method of claim 7 wherein:

Receiving, by the first network node, the second data from the second network node by using two or more channels includes:

The first network node receives the second data from the second network node through two or more fixed channels.
The method according to claim 7 or 8, wherein the receiving, by the first network node, the second data from the second network node by using the two or more channels comprises:

When the channel includes a logical channel, the first network node receives more than two third data frames from the second network node through the two or more channels; the first network node determines the two Positions of the sub-data included in the third data frame in the second data, and assembling the sub-data according to the determined position to obtain the second data;

When the channel includes a physical channel, the first network node receives more than two sub-data frames from the second network node by using the two or more channels, where the sub-data frame is the a part of the fourth data frame encapsulated by the second data; the first network node determines a position of the two or more sub data frames in a fourth data frame encapsulated by the second data, and according to Positioning each sub-data frame to obtain a fourth data frame encapsulated by the second data; the first network node acquiring the second data from a fourth data frame encapsulated by the second data .
The method according to claim 9, wherein the determining, by the first network node, the location of the subdata included in the two or more third data frames in the second data comprises:

Determining, by the first network node, a location of the sub data included in the two or more third data frames in the second data according to a pre-agreed manner; or

Determining, by the first network node, third identifier information carried in the two or more third data frames; the first network node determining, according to the third identifier information, the two or more third data frames The location of the included subdata in the second data.
The method of claim 9, wherein the determining, by the first network node, the location of the two or more sub-data frames in the fourth data frame encapsulated by the second data comprises:

Determining, by the first network node, a position of the two or more sub data frames in a fourth data frame encapsulated by the second data according to a pre-agreed manner; or

Determining, by the first network node, fourth identifier information carried in the two or more sub-data frames; the first network node determining, according to the fourth identifier information, that the two or more sub-data frames are in the The second data is encapsulated into a location in a fourth data frame.
The method according to claim 9 or 11, wherein the receiving, by the first network node, two or more sub-data frames from the second network node by using the two or more channels comprises:

Determining, by the at least one of the two or more channels, a starting position of a sub data frame payload in the first network node by: inserting, in the frame start position of the two or more channels, a determining location Means of a frame header of a start position of a sub-data frame payload in two or more channels; a manner of arranging a start position of the sub-data frame payload in the physical channel with the second network node By initiating with the second network node or by the second network node notifying the start location of the sub-data frame payload in the physical channel and the second network node before the first network a manner in which a start position of a sub data frame payload in a physical channel when a node performs data transmission is the same, wherein the second network node periodically inserts a frame header at a frame start position of two or more physical channels, where The frame header is used to identify a starting position of a sub data frame payload in the physical channel;

Determining more than two sub-data frame payloads from the second network node from the two or more channels based on the determined starting position of the sub-data frame payload in the two or more channels.
A data transmission method includes:

The first network node receives the second data from the second network node through the two or more channels, wherein the second data is uniformly transmitted in the two or more channels;

The first network node is an optical fiber line terminal OLT, and the second network node is a fiber network unit ONU; or the first network node is an ONU, and the second network node is an OLT.
The method of claim 13 wherein:

Receiving, by the first network node, the second data from the second network node by using two or more channels includes:

The first network node receives the second data from the second network node through two or more fixed channels.
The method according to claim 13 or 14, wherein the receiving, by the first network node, the second data from the second network node by using the two or more channels comprises:

When the channel includes a logical channel, the first network node receives more than two third data frames from the second network node through the two or more channels; the first network node determines the two Positions of the sub-data included in the third data frame in the second data, and assembling the sub-data according to the determined position to obtain the second data;

When the channel includes a physical channel, the first network node receives more than two sub-data frames from the second network node by using the two or more channels, where the sub-data frame is the a portion of the fourth data frame encapsulated by the second data; the first network node determining a location of the two or more sub data frames in a fourth data frame encapsulated by the second data, and according to the determined location And assembling, by each sub-data frame, a fourth data frame encapsulated by the second data; the first network node acquiring the second data from a fourth data frame encapsulated by the second data.
A data transmission device is applied to a first network node, including:

a sending module, configured to send the first data to be sent to the second network node to the second network node through two or more channels uniformly;

The first network node is an optical fiber line terminal OLT, and the second network node is a fiber network unit ONU; or the first network node is an ONU, and the second network node is an OLT.
The apparatus of claim 16 further comprising:

The receiving module is configured to receive second data from the second network node through the two or more channels, wherein the second data is uniformly transmitted in the two or more channels.