CN109474564B - Data processing method and device - Google Patents
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- CN109474564B CN109474564B CN201710806119.1A CN201710806119A CN109474564B CN 109474564 B CN109474564 B CN 109474564B CN 201710806119 A CN201710806119 A CN 201710806119A CN 109474564 B CN109474564 B CN 109474564B
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Abstract
The invention discloses a data processing method and a device, wherein the method comprises the following steps: the sending equipment sets a first overhead code word of an overhead block as a preset characteristic value and inserts the overhead block comprising the preset characteristic value into a data stream, wherein the overhead block is each overhead block of the data stream to be inserted into a physical coding sublayer PCS layer; and the sending equipment distributes the data stream with the overhead block insertion to a PCS layer, and carries out 64B/66B coding on the data stream with the overhead block insertion according to a preset coding control word table so as to obtain a first overhead code word specified in a Flexe protocol. Although the position of the Flexe Shim layer is changed, the method can still be executed according to the standard protocol, and the integrity of a PCS layer is ensured.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for processing data.
Background
The rapid increase of network flow enables the bandwidth of communication network information transmission to be larger and larger, and the interface bandwidth of the communication equipment is developed from 10M, 100M, 1000M, 10G, 25G and 100G to 200G/400G. At present, a large number of 100G optical modules are commercially available in the market, and recently developed 200G/400G optical modules are expensive and cannot be commercially available in a short time. In order to deliver 200G/400G traffic with low cost, the International organization for standardization, OIF, defines the Flexe protocol.
The FlexE protocol can bind a plurality of 100G optical modules into a physical channel with a large bandwidth, as shown in fig. 1, 2 100G optical modules are bound together through the FlexE protocol to form a 200G transmission channel, which is equivalent to 1 200G optical module transmission bandwidth, and the transmission requirement of 200G services is met without increasing cost.
As shown in fig. 2, the FlexE1.0 protocol of OIF (Optical Internet Forum) specifies that the location of the Flex Shim layer is between 64/66 codec and scrambling/descrambling of a 100G PCS (physical coding sublayer) layer, and the PCS layer is artificially divided into two sides, which is not favorable for the integrity of the system and increases the requirement for the user using PCS IP to design the system.
Disclosure of Invention
The invention provides a data processing method and a data processing device, which are used for solving the following problems in the prior art: the Flexe1.0 protocol specifies that the Flex Shim layer is positioned between 64/66 codec and scrambling and descrambling of a 100G PCS layer, and the PCS layer is artificially divided into two sides, which is not favorable for the integrity of the system.
To solve the foregoing technical problem, in one aspect, the present invention provides a data processing method, including: the method comprises the steps that a sending device sets a first overhead code word of an overhead block as a preset characteristic value and inserts the overhead block comprising the preset characteristic value into a data stream, wherein the overhead block is each overhead block of the data stream to be inserted into a Physical Coding Sublayer (PCS) layer; and the sending equipment distributes the data stream which completes the insertion of the overhead block to the PCS layer, and carries out 64B/66B coding on the data stream which completes the insertion of the overhead block according to a preset coding control word table so as to obtain a first overhead code word specified in a Flexe protocol.
Optionally, before the sending device sets the first overhead codeword of the overhead block to the preset feature value, the method further includes: adding a preset control word and a description thereof to the preset coding control word table, wherein a preset characteristic value corresponding to the preset control word is an undefined characteristic value in the preset coding control word table, and the description at least includes: the characteristic value of the preset control word after being coded and the data block type value of the preset control word.
Optionally, after obtaining the first overhead codeword specified in the FlexE protocol, the method further includes: the sending device performs a first predetermined process on the overhead block where the first overhead code word specified in the FlexE protocol is located and the data block of each time slot together to obtain a data stream sent to a PMA (physical medium adaptation layer) layer.
In another aspect, the present invention further provides a data processing method, including: the receiving device carries out 64B/66B decoding on the data stream subjected to the second preset processing according to a preset coding control word table so as to determine a preset characteristic value of a first overhead code word of each overhead block; and the receiving equipment performs overhead block identification on the data stream after the 64B/66B decoding according to the preset characteristic value, and deletes the identified overhead block to obtain the data stream to be sent.
Optionally, before the receiving device performs 64B/66B decoding on the data stream subjected to the second predetermined processing according to the preset coding control word table, the method further includes:
the receiving device receives a data stream from the PMA layer and performs the second predetermined processing on the data stream.
In another aspect, the present invention further provides a data processing apparatus, including: an insertion module, configured to set a first overhead codeword of an overhead block to a preset feature value, and insert the overhead block including the preset feature value into a data stream, where the overhead block is each overhead block of the data stream to be inserted into a physical coding sublayer PCS layer; and the coding module is used for distributing the data stream in which the overhead block insertion is completed to the PCS layer, and carrying out 64B/66B coding on the data stream in which the overhead block insertion is completed according to a preset coding control word table so as to obtain a first overhead code word specified in a Flexe protocol.
Optionally, the method further includes: a setting module, configured to add a preset control word and a description thereof in the preset coding control word table, where a preset feature value corresponding to the preset control word is an undefined feature value in the preset coding control word table, and the description at least includes: the characteristic value of the preset control word after being coded and the data block type value of the preset control word.
Optionally, the method further includes: and the first processing module is used for performing first predetermined processing on the overhead block where the first overhead code word specified in the FlexE protocol is located and the data block of each time slot together to obtain a data stream sent to the PMA layer.
In another aspect, the present invention further provides a data processing apparatus, including: a decoding module, configured to perform 64B/66B decoding on the data stream subjected to the second predetermined processing according to a preset coding control word table by a receiving device, so as to determine a preset characteristic value of a first overhead codeword of each overhead block; and the deleting module is used for the receiving equipment to perform overhead block identification on the data stream after the 64B/66B decoding according to the preset characteristic value and delete the identified overhead block so as to obtain the data stream to be sent.
Optionally, the method further includes: and the second processing module is used for receiving the data stream from the PMA layer and performing the second predetermined processing on the data stream.
The invention sets the first overhead code word (frame) of the overhead block as the preset characteristic value, inserts the overhead block including the preset characteristic value into the data stream distributed to the PCS layer, and then when the PCS layer codes the data stream inserted into the overhead block, carries out 64B/66B coding on the data stream completing the overhead block insertion according to the preset coding control word table to obtain the first overhead code word specified in the Flexe protocol, although the Flexe Shim layer is placed in front of the PCS layer in the whole process, the preset characteristic value is set in the preset coding control word table, so that the Flexe Shim layer can be executed according to the standard protocol even if the position of the Flexe Shim layer is changed, the integrity of the PCS layer is ensured, and the following problems in the prior art are solved: the Flexe1.0 protocol specifies that the Flex Shim layer is positioned between 64/66 codec and scrambling and descrambling of a 100G PCS layer, and the PCS layer is artificially divided into two sides, which is not favorable for the integrity of the system.
Drawings
Fig. 1 is a schematic diagram of the application of FlexE protocol in the prior art;
FIG. 2 is a diagram of the 100G MAC architecture in 802.3 and the system architecture specified in the Flexe protocol in the prior art;
FIG. 3 is a flow chart of a data processing method according to a first embodiment of the present invention;
FIG. 4 is a flowchart of another data processing method according to the first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a data processing apparatus according to a second embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another data processing apparatus according to a second embodiment of the present invention;
FIG. 7 is a diagram of a modified Flexe system architecture in a third embodiment of the present invention;
fig. 8 is the first overhead block codeword specified by the FlexE protocol in a third embodiment of the present invention.
Detailed Description
In order to solve the following problems in the prior art: the Flexe1.0 protocol specifies that the position of a Flex Shim layer is between 64/66 codec and scrambling and descrambling of a 100G PCS layer, and the PCS layer is artificially divided into two sides, which is not favorable for the integrity of the system; the present invention provides a data processing method and apparatus, and the following describes the present invention in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The first embodiment of the present invention provides a data processing method, the flow of which is shown in fig. 3, including S302 to S304:
s302, the sending device sets a first overhead code word of an overhead block to a preset characteristic value, and inserts the overhead block including the preset characteristic value into the data stream, wherein the overhead block is each overhead block of the data stream to be inserted into a physical coding sublayer PCS layer. This procedure is actually an operation performed by the FlexE Shim layer of the receiving device.
S304, the sending device distributes the data stream with the overhead block insertion to a PCS layer, and carries out 64B/66B coding on the data stream with the overhead block insertion according to a preset coding control word table to obtain a first overhead code word specified in a Flexe protocol. This process is an operation actually performed by the PCS layer of the receiving device.
The purpose of the embodiment of the invention is to place the Flexe Shim layer in front of the whole PCS layer to ensure the integrity of the PCS layer, but the Flexe Shim layer is placed in the 64B/66B coding of the PCS layer in the existing system, and the standard protocol is also specified, so that the method for processing the data provided by the embodiment can execute the operation corresponding to the Flexe Shim layer in front of the PCS layer without changing the standard protocol.
In the embodiment, a first overhead codeword (frame) of an overhead block is set as a preset characteristic value, the overhead block including the preset characteristic value is inserted into a data stream distributed to a PCS layer, and then when the PCS layer encodes the data stream inserted into the overhead block, the data stream with the overhead block inserted is encoded 64B/66B according to a preset encoding control word table to obtain a first overhead codeword specified in a FlexE protocol, although the FlexE Shim layer is placed before the PCS layer in the whole process, the preset characteristic value is set in the preset encoding control word table, so that the FlexE Shim layer can be executed according to a standard protocol even if the position of the FlexE Shim layer is changed, the integrity of the PCS layer is ensured, and the following problems in the prior art are solved: the Flexe1.0 protocol specifies that the Flex Shim layer is positioned between 64/66 codec and scrambling and descrambling of a 100G PCS layer, and the PCS layer is artificially divided into two sides, which is not favorable for the integrity of the system.
Before the sending device sets the first overhead codeword of the overhead block to the preset feature value, a preset control word and its description may be added in a preset coding control word table, where the preset feature value corresponding to the preset control word is an undefined feature value in the preset coding control word table, and the description at least includes: and presetting the characteristic value of the coded control word and the data block type value of the control word. The table of the preset encoding control words in the process is the table of the 64B/66B encoding control words specified in IEEE 802.3.
After obtaining the first overhead codeword specified in the FlexE protocol, the overhead block in which the first overhead codeword specified in the FlexE protocol is located and the data block of each slot may be subjected to a first predetermined process together to obtain a data stream to be sent to the PMA layer. In this process, the first predetermined processing is scrambling, AM processing, or the like specified in the existing standard flow.
The present embodiment also provides another data processing method, which is a reverse process of the data processing method, that is, a flow executed when the sending device serves as a receiving device, and a flow diagram of the flow is shown in fig. 4, where the flow includes steps S402 to S404:
s402, the receiving device carries out 64B/66B decoding on the data stream subjected to the second preset processing according to a preset coding control word table so as to determine a preset characteristic value of a first overhead code word of each overhead block. This process is actually an operation performed by the PCS layer of the receiving device.
S404, the receiving device performs overhead block identification on the data stream after 64B/66B decoding according to the preset characteristic value, and deletes the identified overhead block to obtain the data stream to be sent. This procedure is actually an operation performed by the FlexE Shim layer of the receiving device.
In this embodiment, as a method for processing data at the time of receiving a device, when a PCS layer receives a data stream from a PMA layer, a second predetermined process is performed on the data stream, and after the second predetermined process is completed, 64B/66B decoding is performed.
Whether as a receiving device or a sending device, the existing processing mode needs to be improved due to the position change of the FlexE Shim layer. In this embodiment, the receiving device performs 64B/66B decoding on the data stream subjected to the second predetermined processing according to the preset coding control word table, so that the preset feature value of the first overhead codeword of each overhead block can be determined, and then the overhead recognition on the data stream subjected to 64B/66B decoding can be performed according to the preset feature value, and all the overhead blocks in the data stream are deleted. Subsequently, according to the prior art, the time slot demapping may be performed on each data block from which the overhead block is deleted, and it is determined which data needs to be sent to which client, and then the data may be sent.
Through the process, the integrity of the PCS layer is guaranteed, and the stability of the system is facilitated.
A second embodiment of the present invention provides a data processing apparatus, a schematic of the structure of which is shown in fig. 5, including:
an inserting module 10, configured to set a first overhead codeword of an overhead block to a preset feature value, and insert the overhead block including the preset feature value into a data stream, where the overhead block is each overhead block of the data stream to be inserted into a physical coding sublayer PCS layer; and the encoding module 11 is coupled to the inserting module 10, and is configured to distribute the data stream in which the overhead block insertion is completed to the PCS layer, and perform 64B/66B encoding on the data stream in which the overhead block insertion is completed according to a preset encoding control word table, so as to obtain a first overhead codeword specified in the FlexE protocol.
When the above-mentioned insertion module 10 is implemented in a device, the corresponding function is performed by the FlexE Shim layer, and the function of the coding module 11 is performed by the PCS layer.
The purpose of the embodiment of the invention is to place the Flexe Shim layer in front of the whole PCS layer to ensure the integrity of the PCS layer, but the Flexe Shim layer is placed in the 64B/66B coding of the PCS layer in the existing system, and the standard protocol is also specified, so that the method for processing the data provided by the embodiment can execute the operation corresponding to the Flexe Shim layer in front of the PCS layer without changing the standard protocol.
In the embodiment, a first overhead codeword (frame) of an overhead block is set as a preset characteristic value, the overhead block including the preset characteristic value is inserted into a data stream distributed to a PCS layer, and then when the PCS layer encodes the data stream inserted into the overhead block, the data stream with the overhead block inserted is encoded 64B/66B according to a preset encoding control word table to obtain a first overhead codeword specified in a FlexE protocol, although the FlexE Shim layer is placed before the PCS layer in the whole process, the preset characteristic value is set in the preset encoding control word table, so that the FlexE Shim layer can be executed according to a standard protocol even if the position of the FlexE Shim layer is changed, the integrity of the PCS layer is ensured, and the following problems in the prior art are solved: the Flexe1.0 protocol specifies that the Flex Shim layer is positioned between 64/66 codec and scrambling and descrambling of a 100G PCS layer, and the PCS layer is artificially divided into two sides, which is not favorable for the integrity of the system.
The above apparatus may further include: the setting module is used for adding a preset control word and a description thereof in a preset coding control word table, wherein a preset characteristic value corresponding to the preset control word is an undefined characteristic value in the preset coding control word table, and the description at least comprises: and presetting the characteristic value of the coded control word and the data block type value of the control word. The table of the preset encoding control words in the process is the table of the 64B/66B encoding control words specified in IEEE 802.3.
The above apparatus may further include: and the first processing module is coupled with the encoding module and is used for performing first predetermined processing on the overhead block where the first overhead code word specified in the FlexE protocol is located and the data block of each time slot together to obtain a data stream sent to the PMA layer. In this process, the first predetermined processing is scrambling, AM processing, or the like specified in the existing standard flow.
A second embodiment of the present invention provides another data processing apparatus, which is substantially the same as the data processing apparatus, and is described as a process of receiving and processing data by the data processing apparatus, and a configuration schematic of the data processing apparatus is shown in fig. 6, and the data processing apparatus includes:
a decoding module 20, configured to perform 64B/66B decoding on the data stream subjected to the second predetermined processing according to a preset coding control word table, so as to determine a preset characteristic value of a first overhead codeword of each overhead block; and the deleting module 21 is coupled to the decoding module 20, and is configured to perform overhead block identification on the data stream after the 64B/66B decoding according to a preset feature value, and delete the identified overhead block, so as to obtain the data stream to be sent.
The above apparatus may further include: and the second processing module is coupled with the decoding module and used for receiving the data stream from the PMA layer and performing second preset processing on the data stream.
No matter the receiving function or the sending function is realized, the position of the FlexE Shim layer is changed, and the existing processing mode needs to be improved. In this embodiment, the data stream subjected to the second predetermined processing is subjected to 64B/66B decoding according to the preset coding control word table, so that the preset feature value of the first overhead codeword of each overhead block can be determined, and then the overhead identification can be performed on the data stream subjected to 64B/66B decoding according to the preset feature value, and all overhead blocks in the data stream are deleted. Subsequently, according to the prior art, the time slot demapping may be performed on each data block from which the overhead block is deleted, and it is determined which data needs to be sent to which client, and then the data may be sent.
Through the process, the integrity of the PCS layer is guaranteed, and the stability of the system is facilitated.
A third embodiment of the present invention provides a data processing method, which is used to flexibly implement an ethernet, and a method of placing a FlexE shim layer between a PCS layer and a client (client) can use a complete PCS layer, thereby bringing great convenience to system implementation and integration, especially for users using PCS IP for system design.
As shown in fig. 7, the architecture of the embodiment of the present invention includes:
client (same part as the prior art), FlexE Shim layer, and complete PCS layer, as shown in fig. 7, the Client, FlexE Shim, PCS, and PMA constitute the entire flexible ethernet system.
The embodiment of the invention realizes the data processing method of the flexible Ethernet as follows:
adding a new code word (/ FlexeOH /) on the basis of the table 1 (an encoding table of 802.3), and defining the characteristic value of the code word on interfaces of XLGMII and CGMI and the block type and the characteristic value after 64B/66B encoding; meanwhile, the interface of the Client and the Flexe Shim layer is changed from 66bits coded by 64B/66B in the original Flexe1.0 protocol into 64-bit data output by the Client; after the Flexe Shim layer is operated, the data stream is coded and decoded according to the characteristic value after encountering a new/FlexeOH/code word in the PCS layer, and the subsequent processing is the same as that of the standard PCS.
TABLE 1
When a new codeword (/ FlexEOH /) is added on the basis of Table 1, the codeword has a characteristic value of 0x6C (not limited, and may be other values not used in 802.3section6Table82-1, where it is assumed to be 6C) on the XLGMII/CGMII side, the Block type of the codeword after 64B/66B coding is 0x4B, and the characteristic value becomes 0x5 (the same as the first codeword of the overhead Block specified in the flexe1.0 protocol, see fig. 8 for the overhead codeword), see the last line in Table 2 (64B/66B coded control word after improvement).
TABLE 2
When receiving the data stream of the Client, the data processing method is as follows:
step 1: flexe Shim receives the data stream from the Client. In a specific implementation, the Client data stream may be a 72-bit data stream (including 64-bit data blocks and 8-bit control words), a 68-bit data stream (including 64-bit data blocks and 4-bit control words), or the like.
Step 2: after time slot mapping is carried out on the data stream by Flexe Shim, overhead insertion is carried out on the time slot mapped data stream, so that the first overhead code word of each overhead block is mapped to be a characteristic value of 0x 6C; the eigenvalue 0x6C is inserted as an overhead into the first of eight overhead codewords of the data stream overhead block.
And step 3: FlexE Shim feeds the overhead inserted data stream to the PCS layer for 64B/66B encoding, encoding the eigenvalues 0x6C into the first overhead codeword specified in the FlexE protocol shown in fig. 8 according to table 2.
And 4, step 4: the PCS layer continues subsequent processing, the process of the PCS layer is the same as that of standard PCS, namely scrambling, AM insertion and the like are carried out.
And 5: and transmitting the processed data to the PMA layer.
When transmitting a data stream to a Client, the data processing method is as follows:
step 1: the PCS layer receives the data stream from the PMA.
Step 2: and according to the standard specification, the PCS layer carries out the processing of synchronization, Deskew, descrambling and the like.
And step 3: the descrambled data stream is decoded 64B/66B, and the first overhead codeword specified in the FlexE protocol shown in fig. 8 is decoded to the eigenvalue 0x6C according to table 2.
And 4, step 4: the Flexe Shim layer confirms that the characteristic value is 0x6C as the first overhead code word to perform overhead block identification, deletes the identified overhead block, and performs time slot demapping on the data stream after the overhead block deletion.
And 5: and the Flexe Shim layer sends the data stream after demapping to the Client.
By adopting the embodiment of the invention, a complete PCS layer can be used, great convenience is brought to system realization and integration, and particularly for users using PCS IP to design systems.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and the scope of the invention should not be limited to the embodiments described above.
Claims (8)
1. A method for processing data, comprising:
adding a preset control word and a description thereof in a preset coding control word table, wherein a preset characteristic value corresponding to the preset control word is an undefined characteristic value in the preset coding control word table, and the description at least comprises: the characteristic value of the coded preset control word and the data block type value of the preset control word;
the method comprises the steps that a sending device sets a first overhead code word of an overhead block as a preset characteristic value and inserts the overhead block comprising the preset characteristic value into a data stream, wherein the overhead block is each overhead block of the data stream to be inserted into a Physical Coding Sublayer (PCS) layer;
and the sending equipment distributes the data stream which completes the insertion of the overhead block to the PCS layer, and carries out 64B/66B coding on the data stream which completes the insertion of the overhead block according to the preset coding control word table so as to obtain a first overhead code word specified in a Flexe protocol.
2. The method of processing data according to claim 1, wherein after obtaining the first overhead codeword specified in the FlexE protocol, further comprising:
and the sending device performs first predetermined processing on an overhead block where a first overhead code word specified in the Flexe protocol is located and a data block of each time slot together to obtain a data stream sent to a physical medium adaptation layer (PMA).
3. A method for processing data, comprising:
the receiving device performs 64B/66B decoding on the data stream subjected to a second predetermined process according to a preset coding control word table to determine a preset characteristic value of a first overhead codeword of each overhead block, wherein the second predetermined process comprises: synchronization, Deskew and descrambling;
and the receiving equipment performs overhead block identification on the data stream after the 64B/66B decoding according to the preset characteristic value, and deletes the identified overhead block to obtain the data stream to be sent.
4. The data processing method of claim 3, wherein before the receiving device performs 64B/66B decoding on the data stream subjected to the second predetermined processing according to the preset code control word table, the method further comprises:
the receiving device receives a data stream from a physical medium adaptation layer (PMA) layer and performs the second predetermined processing on the data stream.
5. An apparatus for processing data, comprising:
a setting module, configured to add a preset control word and a description thereof in a preset coding control word table, where a preset feature value corresponding to the preset control word is an undefined feature value in the preset coding control word table, and the description at least includes: the characteristic value of the coded preset control word and the data block type value of the preset control word;
an insertion module, configured to set a first overhead codeword of an overhead block to a preset feature value, and insert the overhead block including the preset feature value into a data stream, where the overhead block is each overhead block of the data stream to be inserted into a physical coding sublayer PCS layer;
and the coding module is used for distributing the data stream in which the overhead block insertion is completed to the PCS layer, and carrying out 64B/66B coding on the data stream in which the overhead block insertion is completed according to the preset coding control word table so as to obtain a first overhead code word specified in a Flexe protocol.
6. The apparatus for processing data according to claim 5, further comprising:
a first processing module, configured to perform a first predetermined processing on an overhead block where a first overhead codeword specified in the FlexE protocol is located and a data block of each timeslot, so as to obtain a data stream sent to a physical medium adaptation layer PMA layer.
7. An apparatus for processing data, comprising:
a decoding module, configured to perform 64B/66B decoding on the data stream subjected to a second predetermined process by the receiving device according to a preset coding control word table to determine a preset characteristic value of a first overhead codeword of each overhead block, where the second predetermined process includes: synchronization, Deskew and descrambling;
and the deleting module is used for the receiving equipment to perform overhead block identification on the data stream after the 64B/66B decoding according to the preset characteristic value and delete the identified overhead block so as to obtain the data stream to be sent.
8. The apparatus for processing data according to claim 7, further comprising:
and the second processing module is used for receiving the data stream from the physical medium adaptation layer (PMA) layer and performing the second predetermined processing on the data stream.
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