CN100373825C - Line protection reverse method in high-speed parallel optical transmission system - Google Patents
Line protection reverse method in high-speed parallel optical transmission system Download PDFInfo
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- CN100373825C CN100373825C CNB021253536A CN02125353A CN100373825C CN 100373825 C CN100373825 C CN 100373825C CN B021253536 A CNB021253536 A CN B021253536A CN 02125353 A CN02125353 A CN 02125353A CN 100373825 C CN100373825 C CN 100373825C
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Abstract
The present invention discloses a line protection reverse method in a highly parallel optic transmission system. A synchronous byte in an SDH frame of a synchronous digital system is set to a channel number for conveying protection reverse requirements and a signaling code of a protection reverse completing mark of each channel; if a receiving end detects that two of twelve optical fiber channels occur errors, a signaling requesting reverse is sent to a sending end by a reverse link, and after the sending end receives the signaling, the channel is reversed to the last one in the twelve channels when the next SDH frame is started. The method causes network resources to fully use, reduces failure rate, prolongs the average service life of the system, and enhances the management and control capability of the system by using a signaling mode.
Description
Technical field
The present invention relates to high-speed parallel optical transmission system, relate in particular to the line protection reverse method in very short distance (VSR) the high-speed parallel transmission system based on SDH (Synchronous Digital Hierarchy) (SDH).
Background technology
The method that is used for the VSR optical interface of SDH at present is the standard agreement OIF-VSR4-01.0 that adopts optical internet forum (OpticalInternet Forum).This interface adopts 12 parallel fibre ribbons, transmits the data of 9.95238G bits per second with the line speed of every optical fiber 1.24416G bits per second.
The method of VSR interface transmission SDH data is that first sync byte A1 in STM-64 (Synchronous Transport Module level-N) frame structure is put into the first channel road, second A1 byte put into second channel, the rest may be inferred, up to being put into the 9th and the tenth channel, begin the 11 A1 byte of store data STM-64 frame then again from first passage, last byte of STM-64, promptly the 155520th byte put into the transmission that the tenth channel is finished this STM-64 frame until at last.The content of the 11 channel is the parity check to preceding ten channels, and the data of the 12 channel are CRC (cyclic redundancy check (CRC)) verifications of preceding 11 channels.Concrete grammar is: 24 bytes with each passage in 11 passages in front are a dummy block will, dummy block will is calculated CRC16 (cyclic redundancy check (CRC)), preceding two bytes of 12 passages that the CRC16 of first dummy block will of first passage is put into, the CRC16 of the dummy block will of second channel is put into the 3rd, 4 byte of the 12nd passage, the rest may be inferred, the CRC16 of the dummy block will of the 11st passage is put into the position of the 21st, 22 byte of the 12nd passage, and the 23rd, 24 byte of the 12nd passage put the value of the CRC16 of preceding 22 byte datas of this passage.At last, send the data of each channel as line coding by 8B10B (a kind of line coding mode) coding.When mistake appears in a channel, can detect the channel number that makes a mistake by CRC coding and 8B10B coding, adopt the data of other 9 correct channels and the data of the 11 verification channel to do parity check then, can recover to occur the data of false channel.
Said method has the following disadvantages:
1, only transmitted the 9.95238G valid data in the circuit bit of whole 1.24416G * 12, efficiency of transmission is lower.
2, only provide the protection that mistake an optical fiber occurred in the OIF-VSR4-01.0 standard, and in fact owing to only transmitting all data fully with ten optical fiber, so existing method is not made full use of 12 optical fiber.
3, in protection is switched, without any signaling, not only wasted the redundant bit resource of enriching on the circuit between the transmitting-receiving two-end, also be unfavorable for network management.
Summary of the invention
The objective of the invention is to: provide a kind of signaling of utilizing to realize that the high-speed parallel optical transmission system line protection reverse method under the error situation appears in two optical fiber simultaneously.
For achieving the above object; the technical solution used in the present invention is: the line protection reverse method in a kind of high-speed parallel optical transmission system; sync byte in the SDH frame is set to be used to transmit the signalling coding of the claimed channel number of switching and each signal channel protection switching complement mark, and protection is switched implementation and be may further comprise the steps:
1) if receiving terminal detects based on two in 12 fiber channels of VSR in the high-speed parallel optical transmission system of SDH mistake appears, then the signaling of switching to the transmitting terminal request of sending by reverse link provides wherein one channel number of two wrong fiber channels of appearance in signaling;
2) transmitting terminal is received after the above-mentioned signaling, when next SDH frame begins with this signaling in the channel of respective channel number be switched on 12 the last item in the channel, and send to switch to receiving terminal and finish signaling;
3) receiving terminal is received to switch and is finished signaling, sends to transmitting terminal and switches the affirmation signaling;
4) after transmitting terminal is received and switched the affirmation signaling, stop to send to switch finishing signaling.
Adopt said method, Internet resources are utilized more fully, reduce failure rate, prolonged system's average life span, and adopt signaling method that the system management control ability is strengthened.
Description of drawings
Fig. 1 is the state transition diagram of receiving terminal in the inventive method;
Fig. 2 is the state transition diagram of transmitting terminal in the inventive method.
Embodiment
Below in conjunction with drawings and Examples the inventive method is described in further detail.
Sync byte in the inventive method SDH frame is set to be used to transmit the signalling coding of the claimed channel number of switching and each signal channel protection switching complement mark, and protection is switched implementation and be may further comprise the steps:
1) if mistake appears in two of detecting in 12 fiber channels of VSR of receiving terminal, the signaling of switching to the transmitting terminal request of sending by reverse link then provides in signaling and wherein one channel number of two wrong fiber channels occurs;
2) transmitting terminal is received after the above-mentioned signaling, when next SDH frame begins with this signaling in the channel of respective channel number be switched on 12 the last item in the channel, and send to switch to receiving terminal and finish signaling;
3) receiving terminal is received to switch and is finished signaling, sends to transmitting terminal and switches the affirmation signaling;
4) after transmitting terminal is received and switched the affirmation signaling, stop to send to switch finishing signaling.
In concrete the enforcement, signalling coding can be that the 41st to the 50th sync byte A1 with STM-64 (Synchronous Transport Module level-N) frame encodes, and identifies the claimed channel number of switching and each signal channel protection switching complement mark respectively with high and low respectively 4 bits.With signaling content replacement A1 byte herein, is the A1 byte at receiving terminal with signaling decoding at transmitting terminal, and like this, signaling does not produce any influence to SDH regenerator section transparent data transmission, does not increase overhead yet.Concrete signalling coding can be represented as following table:
| The coding (bit7-bit4) of signaling is switched in request | The signaling particular content is switched in request |
| 0000 | Normal condition |
| 0001 | Channel 1 protected switch |
| 0010 | Channel 2 protected switch |
| 0011 | Channel 3 protected switch |
| 0100 | Channel 4 protected switch |
| 0101 | Channel 5 protected switch |
| 0110 | Channel 6 protected switch |
| 0111 | Channel 7 protected switch |
| 1000 | Channel 8 protected switch |
| 1001 | Channel 9 protected switch |
| 1010 | Channel 10 protected switch |
| 1011 | Do not use |
| 1100 | Do not use |
| 1101 | Do not use |
| 1110 | Do not use |
| 1111 | Do not use |
| Switch the coding (bit3-bit0) of finishing signaling | Switch and finish the signaling particular content |
| 0000 | Normal condition |
| 0001 | Finishing channel 1 protection switches |
| 0010 | Finishing channel 2 protections switches |
| 0011 | Finishing channel 3 protections switches |
| 0100 | Finishing channel 4 protections switches |
| 0101 | Finishing channel 5 protections switches |
| 0110 | Finishing channel 6 protections switches |
| 0111 | Finishing channel 7 protections switches |
| 1000 | Finishing channel 8 protections switches |
| 1001 | Finishing channel 9 protections switches |
| 1010 | Finishing channel 10 protections switches |
| 1011 | Do not use |
| 1100 | Do not use |
| 1101 | Do not use |
| 1110 | Do not use |
| 1111 | Do not use |
For avoiding factors such as contingent error code on the circuit to cause the misinformation of signaling, switch signaling and adopt parallel transmission, the mode of majority vote.Be signaling in transport process, set and to receive that there is identical signaling in the condition of signaling for having at least in 5 channels.
Below by network equipment A and the B of two VSR,, the signaling procedure of being implemented is described in detail with reference to Fig. 1, Fig. 2 at the concrete condition of hypothesis:
1, initial link is in normal condition, and the 41st to the 50th A1 byte of each SDH frame all is encoded to Binary Zero 0000000, other A1 byte normal transmission.
2, equipment B has detected link 3 and link 5 breaks down, and at first B sends request by the reverse link from B to A to device A and switches signaling.From then on SDH frame the 41st to the 50th the A1 byte that begins to send from B to A all is encoded to 00110000, and expression B requirement A protects channel 3 and switches.
3, A detects 41 to the 50th A1 bytes of the SDH frame that B sends, and considers factors such as error code, and having 5 bytes at least is 00110000 can think and received the signaling that channel 3 is switched in protection.Beginning to switch to the next SDH frame that B sends from A, simultaneously this frame the 41st to the 50th A1 byte all is encoded to 00000011, send to switch and finish signaling.And send this signaling in the frame afterwards always.
4, B receives that switching of A finish signaling, switches, and has finished from A to B link switchover process.
5, afterwards, A has detected link 6 and link 8 breaks down, and at first A sends request by the reverse link from A to B to B and switches signaling.From then on SDH frame the 41st to the 50th the A1 byte that begins to send from A to B all is encoded to 01100011, and expression A requirement B protects channel 6 and switches, and A has finished switching of channel 3 simultaneously.
6, B detects 41 to the 50th A1 bytes of the SDH frame that A sends, and considers factors such as error code, and having 5 bytes at least is 01100011 can think and received the signaling that channel 6 is switched in protection.Beginning to switch to the next SDH frame that A sends from B, simultaneously this frame 41 to the 50th A1 byte all is encoded to 00110110, send to switch and finish signaling.And send this signaling in the frame afterwards always.
7, A receives that switching of B finish signaling, switches, and has finished the reversed process from B to the A link.
8, so far, link has been finished and has two-wayly been had the protection that two optical fiber break down to switch.Need to prove that the standard agreement that the protection of another that a breaks down optical fiber is simultaneously switched still by prior art carries out.
Claims (3)
1. the line protection reverse method in the high-speed parallel optical transmission system; when the optical interface that uses the OIF-VSR4-01.0 standard; when receiving terminal carries out switching of corresponding fiber channel; it is characterized in that: the sync byte in the SDH frame is set to be used to transmit the signalling coding of the claimed channel number of switching and each signal channel protection switching complement mark, and protection is switched implementation and be may further comprise the steps:
1) if mistake appears in two of detecting in 12 fiber channels of very short distance optical interface VSR of Synchronous Optical Network of receiving terminal, then the signaling of switching to the transmitting terminal request of sending by reverse link provides wherein one channel number of two wrong fiber channels of appearance in signaling;
2) transmitting terminal is received after the above-mentioned signaling, when next SDH frame begins with this signaling in the channel of respective channel number be switched on 12 the last item in the channel, and send to switch to receiving terminal and finish signaling;
3) receiving terminal is received to switch and is finished signaling, and receiving terminal carries out switching of corresponding fiber channel, sends to transmitting terminal and switches the affirmation signaling;
4) after transmitting terminal is received and switched the affirmation signaling, stop to send to switch finishing signaling.
2. the line protection reverse method in the high-speed parallel optical transmission system as claimed in claim 1; it is characterized in that: it is that the 41st to the 50th sync byte A1 with STM-64 (Synchronous Transport Module level-N) frame encodes that described request is switched signalling coding, identifies the claimed channel number of switching and each signal channel protection switching complement mark respectively with high and low each 4 bit.
3. the line protection reverse method in the high-speed parallel optical transmission system as claimed in claim 2 is characterized in that: described switching finished signaling in transport process, sets and receives that there is identical signaling in the condition of signaling for having at least in 5 channels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021253536A CN100373825C (en) | 2002-07-26 | 2002-07-26 | Line protection reverse method in high-speed parallel optical transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021253536A CN100373825C (en) | 2002-07-26 | 2002-07-26 | Line protection reverse method in high-speed parallel optical transmission system |
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| CN1395382A CN1395382A (en) | 2003-02-05 |
| CN100373825C true CN100373825C (en) | 2008-03-05 |
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| CNB021253536A Expired - Fee Related CN100373825C (en) | 2002-07-26 | 2002-07-26 | Line protection reverse method in high-speed parallel optical transmission system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433631C (en) * | 2003-10-17 | 2008-11-12 | 中兴通讯股份有限公司 | Method for treating SONET/SDH complexing segment frequent changing-over |
| CN100496009C (en) | 2004-11-04 | 2009-06-03 | 华为技术有限公司 | Node protection inversion method and device in RPR network |
| CN101001123B (en) * | 2006-12-31 | 2011-04-13 | 华为技术有限公司 | Inversion method and device for optical transmission |
| CN101150878B (en) * | 2007-08-06 | 2010-09-08 | 北京邮电大学 | Parallel signaling method for realizing quick optical channel connection in intelligent optical network |
| EP2688230B1 (en) | 2011-06-21 | 2016-04-27 | Huawei Technologies Co., Ltd. | Optical line transmission protection system and method |
| CN104660326A (en) * | 2015-02-13 | 2015-05-27 | 田勐 | High-speed and automatic SDH (synchronous digital hierarchy) switching method and device based on channel quality |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000307438A (en) * | 1999-02-15 | 2000-11-02 | Nec Corp | Error correction encoding and decoding method and its device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000307438A (en) * | 1999-02-15 | 2000-11-02 | Nec Corp | Error correction encoding and decoding method and its device |
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