CN117425101A - Frame decoding method and device of GPON resource checker - Google Patents
Frame decoding method and device of GPON resource checker Download PDFInfo
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- CN117425101A CN117425101A CN202311736657.XA CN202311736657A CN117425101A CN 117425101 A CN117425101 A CN 117425101A CN 202311736657 A CN202311736657 A CN 202311736657A CN 117425101 A CN117425101 A CN 117425101A
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- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 238000007405 data analysis Methods 0.000 claims abstract description 12
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 238000013519 translation Methods 0.000 claims description 10
- 238000012795 verification Methods 0.000 claims description 9
- 238000009432 framing Methods 0.000 claims description 6
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
Abstract
The invention relates to a method and a device for decoding a GPON resource check device, after finding data, the invention simultaneously assumes that two delimiters are matched with each other to obtain correct data, and then analyzes the correct data according to PLOAM format and PLOAM-free format at the same time to obtain PLOAM format data and PLOAM-free format data; and then respectively carrying out GEM synchronization on the PLOAM format data and the PLOAM format-free data, wherein the data with correct GEM synchronization is the correct GEM data, and finally carrying out GEM data analysis. Therefore, the invention processes various branches which can occur in parallel when determining the delimiter and determining whether the data is PLOAM format data, thereby realizing the analysis of uplink data under the condition of not analyzing downlink data. Compared with the prior art, the invention does not need downlink data, saves equipment cost, simplifies the connection mode and does not change the structure and data of the existing network.
Description
Technical Field
The invention relates to the technical field of GPON, and discloses a frame decoding method and device of a GPON resource checking instrument.
Background
With the rapid development of PON technology, GPON application is increasingly complex, and operators need to check network data, so it is urgent to provide a resource checker that can meet the requirements of operators, and is low-priced and reliable.
At present, the resource checking device mainly receives downlink data, and obtains bandwidth and time delay parameters from the downlink data, so that the uplink data is decoded, the uplink data and the downlink data are required, the cost is high, and the frame decoding rate is slow.
Disclosure of Invention
The invention aims to provide a frame decoding method and device of a GPON resource checking device, which can complete the analysis of PLOAM, OMCI and Ethernet packets of uplink data only by uplink data without downlink data, has low cost and high speed, and well solves the requirements of the resource checking device.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for de-framing a GPON resource checker, the method comprising the steps of:
step S1, disconnecting from a GPON network which normally operates, reversely connecting a 2:1 optical splitter in series, and connecting a resource checking instrument into the optical splitter to receive GPON network data;
step S2, searching in the data received by the resource checking instrument, and searching the data of the first binary data bit 10101011 or 10101000, wherein 10 is the data in the preamble, 1011 or 1000 is the forefront data of the delimiter;
step S3, the data searched in the step S2 are assumed, and the delimiters of 16bits and 20bits are assumed to obtain correct data and descramble the correct data, so that descrambled data are obtained;
s4, analyzing the descrambled data obtained in the step S3 according to a PLOAM format, and obtaining PLOAM format data correctly; meanwhile, the descrambled data obtained in the step S3 are analyzed according to the PLOAM format without the PLOAM, so that the data without the PLOAM format is obtained;
step S5, the PLOAM format data and the PLOAM format data without PLOAM format obtained in the step S4 are respectively subjected to GEM synchronization, the PLOAM format data with correct GEM synchronization or the PLOAM format data without PLOAM format data are used as correct GEM data, namely if the GEM synchronization of the PLOAM format data is correct, the PLOAM format data are used as correct GEM data; if the GEM synchronization of the PLOAM format data is not correct, the PLOAM format data is not used as correct GEM data;
and S6, analyzing the GEM data obtained in the step S5 to obtain an Ethernet packet or an OMCI packet, and confirming whether the FCS check of the Ethernet packet or the OMCI packet is correct or not, if the FCS check is correct, indicating that the Ethernet packet or the OMIC packet obtained through analysis is correct.
In the step S3, the 12bits and 16bits after the "1000" or "1011" are matched with the corresponding bits in the set delimiter code, if the matching is successful, the data is correct, and if the matching is not successful, the data is discarded.
In the step S5, the GEM synchronization process is as follows:
taking the first 5 bytes of the PLOAM format data and the PLOAM-free format data as GEM heads, performing HEC verification on the last 13 bits of the PLOAM format data and the PLOAM-free format data, and taking the data which are checked to be correct in the PLOAM format data and the PLOAM-free format data as correct GEM data.
If the PLOAM format data and the PLOAM format data are not synchronous when the GEM synchronization is carried out, translating the two paths of data by one byte backwards when the GEM header is taken, then continuing to check, repeating the translation operation until one path of data in the two paths of data is checked to be correct, and taking the data with correct GEM synchronization as correct GEM data.
And step S6, when the GEM data analysis is carried out, analyzing the GEM data behind the GEM head according to the data packet length in the GEM head, and extracting an Ethernet packet or an OMCI packet.
The frame decoding device of the GPON resource checking device comprises a resource checking device and a beam splitter, wherein the beam splitter is a 2:1 beam splitter and is used for reversely connecting with a GPON network in series; the resource checking instrument is connected to the beam splitter; the resource checking device is provided with a data searching module, a hypothesis module, a PLOAM format analyzing module, a GEM synchronizing module and a GEM data analyzing module;
the data searching module is used for searching in the data received by the resource checking device, and searching the data with the first binary data bit of 10101011 or 10101000, wherein 10 is the data in the preamble, and 1011 or 1000 is the forefront data of the delimiter;
the presumption module is used for presuming the data found by the data searching module, presuming delimiters of 16bits and 20bits, obtaining correct data and descrambling, and obtaining descrambled data;
the PLOAM format analysis module is used for carrying out PLOAM format analysis on the descrambled data obtained by the assumption module to obtain PLOAM format data;
the PLOAM format-free analysis module is used for analyzing the descrambled data obtained by the assumption module without PLOAM format to obtain PLOAM format-free data;
the GEM synchronization module is used for respectively performing GEM synchronization on the PLOAM format data and the PLOAM format data without the PLOAM format, taking the PLOAM format data with correct GEM synchronization or the PLOAM format data without the PLOAM format data as correct GEM data, namely if the GEM synchronization of the PLOAM format data is correct, taking the PLOAM format data as correct GEM data; if the GEM synchronization of the PLOAM format data is not correct, the PLOAM format data is not used as correct GEM data;
the GEM data analysis module is used for analyzing the GEM data obtained by the GEM synchronization module to obtain an Ethernet packet or an OMCI packet, confirming whether the FCS check of the Ethernet packet or the OMCI packet is correct or not, and if the FCS check is correct, indicating that the Ethernet packet or the OMIC packet obtained by analysis is correct.
The assumption module matches the 12bits and 16bits after 1000 or 1011 with the corresponding bits in the set delimiter code, if the matching is successful, the data is correct, and if the matching is impossible, the data is discarded.
The GEM synchronization process of the GEM synchronization module is as follows:
taking the first 5 bytes of the PLOAM format data and the PLOAM-free format data as GEM heads, performing HEC verification on the last 13 bits of the PLOAM format data and the PLOAM-free format data, and taking the data which are checked to be correct in the PLOAM format data and the PLOAM-free format data as correct GEM data.
If the PLOAM format data and the PLOAM format data are not synchronous when the GEM synchronization is carried out, translating the two paths of data by one byte backwards when the GEM header is taken, then continuing to check, repeating the translation operation until one path of data in the two paths of data is checked to be correct, and taking the data with correct GEM synchronization as correct GEM data.
The GEM header comprises a data packet length, and when the GEM data analysis module analyzes the GEM data behind the GEM header according to the data packet length in the GEM header, the GEM data analysis module extracts an Ethernet packet or an OMCI packet.
After the scheme is adopted, according to the characteristics that only PLOAM, OMCI and Ethernet data are needed by a resource checking device, meanwhile, two delimiters are assumed to be subjected to data matching to obtain correct data, and then the correct data are analyzed according to a PLOAM format and a PLOAM-free format at the same time to obtain PLOAM format data and PLOAM-free format data; and then respectively carrying out GEM synchronization on the PLOAM format data and the PLOAM format-free data, wherein the data with correct GEM synchronization is the correct GEM data, and finally carrying out GEM data analysis. Therefore, the invention processes various branches which possibly occur in parallel when determining the delimiter and determining whether the data is PLOAM format data, thereby realizing the analysis of uplink data under the condition of not analyzing downlink data (the delimiter and the PLOAM format data information are provided in the downlink data). Compared with the prior art, the invention does not need downlink data, saves equipment cost, simplifies the connection mode and does not change the structure and data of the existing network.
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FIG. 1 is a flow chart of an embodiment of the present invention;
fig. 2 is a functional block diagram of the present invention.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments.
Referring to fig. 1, a method for de-framing a GPON resource checker is shown, and the method sequentially performs the following steps:
step S1, disconnecting from a GPON network which normally operates, reversely connecting a 2:1 optical splitter in series, and connecting a resource checking instrument into the optical splitter to receive GPON network data;
step S2, searching in the data received by the resource checking instrument, and searching the data of the first binary data bit 10101011 or 10101000, wherein 10 is the data in the preamble, 1011 or 1000 is the forefront data of the delimiter;
step S3, the data searched in the step S2 are assumed, and the delimiters of 16bits and 20bits are assumed to obtain correct data and descramble the correct data, so that descrambled data are obtained;
s4, analyzing the descrambled data obtained in the step S3 according to a PLOAM format, and obtaining PLOAM format data correctly; meanwhile, the descrambled data obtained in the step S3 are analyzed according to the PLOAM format without the PLOAM, so that the data without the PLOAM format is obtained;
step S5, the PLOAM format data and the PLOAM format data without PLOAM format obtained in the step S4 are respectively subjected to GEM synchronization, the PLOAM format data with correct GEM synchronization or the PLOAM format data without PLOAM format data are used as correct GEM data, namely if the GEM synchronization of the PLOAM format data is correct, the PLOAM format data are used as correct GEM data; if the GEM synchronization of the PLOAM format data is not correct, the PLOAM format data is not used as correct GEM data;
and S6, analyzing the GEM data obtained in the step S5 to obtain an Ethernet packet or an OMCI packet, and confirming whether the FCS check of the Ethernet packet or the OMCI packet is correct or not, if the FCS check is correct, indicating that the Ethernet packet or the OMIC packet obtained through analysis is correct.
Since in step S2 there are already the four bits of the binary 1000 or 1011 that are the forefront of the delimiter, in step S3, only the 12bits and 16bits after "1000" or "1011" are matched with the corresponding bits in the set delimiter, if the matching is successful, the correct data is discarded, and if the matching is not successful.
In the step S5, the GEM synchronization process is as follows: taking the first 5 bytes of the PLOAM format data and the PLOAM-free format data as GEM heads, performing HEC verification on the last 13 bits of the PLOAM format data and the PLOAM-free format data, and taking the data which are checked correctly in the PLOAM format data and the PLOAM-free format data as correct GEM data if the verification is correct.
If the PLOAM format data and the PLOAM format data are not synchronous when the GEM synchronization is carried out, translating the two paths of data one byte later when the GEM header is taken, then continuing to check, repeating the translation operation until one path of data GEM in the two paths of data is synchronous correctly or reaches the set translation times, taking the data with correct GEM synchronization as correct GEM data, and discarding the data when the GEM is not synchronous correctly.
And step S6, when the GEM data analysis is carried out, analyzing the GEM data behind the GEM head according to the data packet length in the GEM head, and extracting an Ethernet packet or an OMCI packet.
As shown in fig. 2, based on the same inventive concept, the invention also discloses a frame decoding device of the GPON resource checker, which comprises a resource checker and a beam splitter, wherein the beam splitter is a 2:1 beam splitter and is used for reversely connecting with a GPON network in series; the resource checking instrument is connected to the beam splitter; the resource checking device is provided with a data searching module, a hypothesis module, a PLOAM format analyzing module, a GEM synchronizing module and a GEM data analyzing module.
The data searching module is used for searching in the data received by the resource checking device, and searching the data with the first binary data bit of 10101011 or 10101000, wherein 10 is the data in the preamble, and 1011 or 1000 is the forefront data of the delimiter.
And the presumption module is used for presuming the data found by the data searching module, presuming delimiters of 16bits and 20bits, acquiring correct data and descrambling to obtain descrambled data.
And the PLOAM format analysis module is used for carrying out PLOAM format analysis on the descrambled data obtained by the assumption module to obtain PLOAM format data.
And the PLOAM format-free analysis module is used for analyzing the descrambled data obtained by the assumption module without PLOAM format to obtain PLOAM format-free data.
The GEM synchronization module is used for respectively performing GEM synchronization on the PLOAM format data and the PLOAM format data without the PLOAM format, and taking the PLOAM format data with correct GEM synchronization or the PLOAM format data without the PLOAM format data as correct GEM data, namely if the GEM synchronization of the PLOAM format data is correct, the PLOAM format data is taken as correct GEM data; if the GEM synchronization of the PLOAM format data is not correct, the PLOAM format data is not used as correct GEM data.
And the GEM data analysis module is used for analyzing the GEM data obtained by the GEM synchronization module to obtain an Ethernet packet or an OMCI packet, confirming whether the FCS check of the Ethernet packet or the OMCI packet is correct or not, and if the FCS check is correct, indicating that the Ethernet packet or the OMIC packet obtained by analysis is correct.
Because the data lookup module has binary 1000 or 1011 as the four first bits of the delimiter when looking up data. Therefore, the module is assumed to match the 12bits and the 16bits after 11 with the corresponding bits in the set delimiter codes, if the matching is successful, the data is correct, and if the matching is not successful, the data is discarded.
The GEM synchronization process of the GEM synchronization module is as follows:
taking the first 5 bytes of the PLOAM format data and the PLOAM-free format data as GEM heads, performing HEC verification on the last 13 bits of the PLOAM format data and the PLOAM-free format data, and taking the data which are checked to be correct in the PLOAM format data and the PLOAM-free format data as correct GEM data.
If the PLOAM format data and the PLOAM format data are not synchronous when the GEM synchronization is carried out, translating the two paths of data one byte later when the GEM header is taken, then continuing to check, repeating the translation operation until one path of data GEM in the two paths of data is synchronous correctly or reaches the set translation times, taking the data with correct GEM synchronization as correct GEM data, and discarding the data when the GEM is not synchronous correctly.
The GEM header contains the data packet length, and when the GEM data analysis module analyzes the GEM data behind the GEM header according to the data packet length in the GEM header, the GEM data analysis module extracts an Ethernet packet or an OMCI packet.
In summary, according to the characteristics that only PLOAM, OMCI and Ethernet data are needed by the resource checking device, the scheme of the invention simultaneously assumes that two delimiters are subjected to data matching to obtain correct data, and then analyzes the correct data according to the PLOAM format and the PLOAM-free format at the same time to obtain PLOAM format data and PLOAM-free format data; and then respectively carrying out GEM synchronization on the PLOAM format data and the PLOAM format-free data, wherein the data with correct GEM synchronization is the correct GEM data, and finally carrying out GEM data analysis. Therefore, the invention processes various branches which possibly occur in parallel when determining the delimiter and determining whether the data is PLOAM format data, thereby realizing the analysis of uplink data under the condition of not analyzing downlink data (the delimiter and the PLOAM format data information are provided in the downlink data). Compared with the prior art, the invention does not need downlink data, saves equipment cost, simplifies the connection mode and does not change the structure and data of the existing network.
The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present invention may be better understood. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A method for de-framing a GPON resource checker, comprising the steps of:
step S1, disconnecting from a GPON network which normally operates, reversely connecting a 2:1 optical splitter in series, and connecting a resource checking instrument into the optical splitter to receive GPON network data;
step S2, searching in the data received by the resource checking instrument, and searching the data of the first binary data bit 10101011 or 10101000, wherein 10 is the data in the preamble, 1011 or 1000 is the forefront data of the delimiter;
step S3, the data searched in the step S2 are assumed, and the delimiters of 16bits and 20bits are assumed to obtain correct data and descramble the correct data, so that descrambled data are obtained;
s4, analyzing the descrambled data obtained in the step S3 according to a PLOAM format, and obtaining PLOAM format data correctly; meanwhile, the descrambled data obtained in the step S3 are analyzed according to the PLOAM format without the PLOAM, so that the data without the PLOAM format is obtained;
step S5, the PLOAM format data and the PLOAM format data without PLOAM format obtained in the step S4 are respectively subjected to GEM synchronization, the PLOAM format data with correct GEM synchronization or the PLOAM format data without PLOAM format data are used as correct GEM data, namely if the GEM synchronization of the PLOAM format data is correct, the PLOAM format data are used as correct GEM data; if the GEM synchronization of the PLOAM format data is not correct, the PLOAM format data is not used as correct GEM data;
and S6, analyzing the GEM data obtained in the step S5 to obtain an Ethernet packet or an OMCI packet, and confirming whether the FCS check of the Ethernet packet or the OMCI packet is correct or not, if the FCS check is correct, indicating that the Ethernet packet or the OMIC packet obtained through analysis is correct.
2. The frame decoding method of a GPON resource checker according to claim 1, wherein in the step S3, 12bits and 16bits after "1000" or "1011" are matched with corresponding bits in a set delimiter code, and if the matching is successful, correct data is discarded if the matching is unsuccessful.
3. The method for frame de-framing of GPON resource checker according to claim 1, wherein in step S5, GEM synchronization is performed as follows:
taking the first 5 bytes of the PLOAM format data and the PLOAM-free format data as GEM heads, performing HEC verification on the last 13 bits of the PLOAM format data and the PLOAM-free format data, and taking the data which are checked to be correct in the PLOAM format data and the PLOAM-free format data as correct GEM data.
4. A method for decoding a GPON resource checker according to claim 3, wherein if the PLOAM format data and the non-PLOAM format data are not synchronized when GEM synchronization is performed, the two paths of data are translated one byte backward when GEM header is taken, then verification is continued, translation operation is repeated until one path of data GEM in the two paths of data is synchronized correctly or reaches a set translation frequency, the data with correct GEM synchronization is taken as correct GEM data, and the data is discarded when GEM synchronization is not correct.
5. The frame decoding method of a GPON resource checker according to claim 3 or 4, wherein the GEM header includes a data packet length, and step S6 parses GEM data after the GEM header according to the data packet length in the GEM header when performing GEM data parsing, and extracts an ethernet packet or an OMCI packet.
6. The utility model provides a device of frame that separates of GPON resource check appearance which characterized in that: the system comprises a resource checking device and a beam splitter, wherein the beam splitter is a 2:1 beam splitter and is used for reversely connecting with a GPON network in series; the resource checking instrument is connected to the beam splitter; the resource checking device is provided with a data searching module, a hypothesis module, a PLOAM format analyzing module, a GEM synchronizing module and a GEM data analyzing module;
the data searching module is used for searching in the data received by the resource checking device, and searching the data with the first binary data bit of 10101011 or 10101000, wherein 10 is the data in the preamble, and 1011 or 1000 is the forefront data of the delimiter;
the presumption module is used for presuming the data found by the data searching module, presuming delimiters of 16bits and 20bits, obtaining correct data and descrambling, and obtaining descrambled data;
the PLOAM format analysis module is used for carrying out PLOAM format analysis on the descrambled data obtained by the assumption module to obtain PLOAM format data;
the PLOAM format-free analysis module is used for analyzing the descrambled data obtained by the assumption module without PLOAM format to obtain PLOAM format-free data;
the GEM synchronization module is used for respectively performing GEM synchronization on the PLOAM format data and the PLOAM format data without the PLOAM format, taking the PLOAM format data with correct GEM synchronization or the PLOAM format data without the PLOAM format data as correct GEM data, namely if the GEM synchronization of the PLOAM format data is correct, taking the PLOAM format data as correct GEM data; if the GEM synchronization of the PLOAM format data is not correct, the PLOAM format data is not used as correct GEM data;
the GEM data analysis module is used for analyzing the GEM data obtained by the GEM synchronization module to obtain an Ethernet packet or an OMCI packet, confirming whether the FCS check of the Ethernet packet or the OMCI packet is correct or not, and if the FCS check is correct, indicating that the Ethernet packet or the OMIC packet obtained by analysis is correct.
7. The frame de-framing device of a GPON resource checker according to claim 6, wherein the hypothesis module matches 12bits and 16bits after "1000" or "1011" with corresponding bits in a set delimiter, and if the matching is successful, the data is correct, and if the matching is not correct, the data is discarded.
8. The frame de-framing device of the GPON resource checker according to claim 6, wherein the GEM synchronization process of the GEM synchronization module is as follows:
taking the first 5 bytes of the PLOAM format data and the PLOAM-free format data as GEM heads, performing HEC verification on the last 13 bits of the PLOAM format data and the PLOAM-free format data, and taking the data which are checked to be correct in the PLOAM format data and the PLOAM-free format data as correct GEM data.
9. The frame decoding device of a GPON resource check apparatus according to claim 8, wherein if the PLOAM format data and the non-PLOAM format data are not synchronized when GEM synchronization is performed, the two paths of data are translated one byte backward when GEM header is taken, then verification is continued, and translation operation is repeated until one path of data GEM in the two paths of data is synchronized correctly or reaches a set translation number, the data with correct GEM synchronization is taken as correct GEM data, and the data is discarded when GEM synchronization is not correct.
10. The frame decoding device of the GPON resource check apparatus according to claim 8 or 9, wherein the GEM header includes a data packet length, and the GEM data parsing module parses GEM data after the GEM header according to the data packet length in the GEM header when performing GEM data parsing, and extracts an ethernet packet or an OMCI packet.
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