CN1801768A - Multiplex section shared loop protecting method - Google Patents
Multiplex section shared loop protecting method Download PDFInfo
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- CN1801768A CN1801768A CN 200410104055 CN200410104055A CN1801768A CN 1801768 A CN1801768 A CN 1801768A CN 200410104055 CN200410104055 CN 200410104055 CN 200410104055 A CN200410104055 A CN 200410104055A CN 1801768 A CN1801768 A CN 1801768A
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Abstract
Present invention relates to multiplexing segment sharing ring circuit protection method, which contains pre - linking protection channel among sites to protection channel loop, when circuit between two sites in loop occurs fault, executing follow steps, A, when detecting circuit fault in any end of site, sending multiplexing segment sharing fault indication message to opposite site of fault circuit, B, fault circuit two ends site detecting the circuit fault alerting signal or receiving multiplexing segment far end fault indication information, then respectively bridging fault circuital transmitting/reception channel to corresponding protection channel to complete the switch from working channel to protection channel. Said invention can raise the switching speed and reliability between work channel and protection channel.
Description
Technical field
The present invention relates to optical communication network, refer to especially in the two-fibre two-way multi-section shared protection ring, when service aisle breaks down, realize the method for loop service protection by the protection passage.
Background technology
SDH (Synchronous Digital Hierarchy, digital synchronous system) is the synchronizing network tranmission techniques that develops rapidly after the eighties in 20th century.He is as a bottom transmission network with world's unified standard, by optical fiber/WDM (Wavelength Division Multiplexed, wavelength division multiplexing) physical communication circuit such as, extensively reliably coffret is provided, support that the exchange of speech on upper strata converges/exchanges data network application such as converges.A very important characteristic is its physical circuit protective capability in the SDH technology, multiplex section looped network protection wherein be widely used at present, physical circuit resist technology efficiently.He is by the communication port performance monitoring of multiplex section and bridge joint protection control automatically; can in less than the time of 50ms, realize transmitting the self-healing of looped network; thereby guaranteed that the upper layer network application apparatus can also keep continuous application when physical circuit loses efficacy, can not connect by interrupting service.
The multiplex section protective ring of SDH is now widely used to be the two-fibre two-way multi-section shared protection ring, only needs two optical fiber between two adjacent nodes on it requires to encircle, as shown in Figure 1.Utilize the time gas exchange technology; article one, optical fiber carries active channel S1 and protection path P2 simultaneously; carry active channel S2 and protection passage P1 on another optical fiber simultaneously; half-path regulation carries active channel S on every optical fiber; second half path carries protection path P; active channel S1 on an optical fiber, by protecting along the protection path P1 on rightabout another optical fiber of ring, vice versa.
A STM-N (Synchronous Transfer Mode N; Synchronous Transfer Mode N rank) two-fibre two-way multi-section shared protection ring; its total N AU4 (Administration unit 4; administrative unit 4 ranks); be numbered in the clockwise direction 1 to the time slot arrangement of N/2 as active channel, be numbered N/2+1 to the AU4 time slot arrangement of N as protecting path.The time slot arrangement of optical fiber is similar on the counter clockwise direction.The AU4 active channel that is numbered m is protected by protection passage (N/2+m) individual AU4 in the opposite direction of correspondence.Working capacity and protection capacity respectively are N/2 AU4.Under the situation of two fine ring operate as normal, as Fig. 1, walk on the working time slot in A-B-C path by the business of A to C, when one section among the operating path A-B-C or several sections optical fiber break down disconnected when fine as the optical fiber between B-C, the B/C website can detect optical fiber disconnected fine alarm such as LOS (Loss of Signal, loss of signal alarm), this moment, the B/C website can utilize specific communications passage such as K byte lane and APS (the AutoProtect Switch in the reciprocal signalling channel respectively, APS) agreement, with the fault type between the B-C " SF " (SignalFailure, channel lost efficacy) inform to encircle and go up other website, website such as A on the professional protection path, D, C equipment is after receiving this information, can respectively the corresponding protection time slot be coupled together as alternate channel, finish after the foundation of alternate channel, the A/C website is bridged to protection time slot (among the figure shown in the dotted line) with business from working time slot (the figure shown in the solid line), thereby business is dealt into C by the protection path from A; After the trouble shooting between the B-C; B/C can receive the information that the LOS alarm disappears; at this time the B/C website can be passed to ring with this message by specific communications passage and APS agreement and go up other each point; rebulid the working time slot between the A-B-C; business is returned to working time slot again; protect each website on the path to remove the protection time slot then, get back to normal loop circuit state.
Existing multiplex section shared loop protecting must be used the APS agreement; the K byte communication of APS protocol processes and support thereof is time-consuming very long in real protection; and to system architecture; software processes speed etc. has higher requirements; otherwise be difficult to reach the guard time requirement of 50ms, simultaneously since in the APS agreement regulation loop website number can not surpass 16 websites, the networking of reality is also had certain restriction; therefore, conclude prior art and have following shortcoming:
1, the APS protocol processes needs website nearly all in the looped network to participate in, and communication time is very long mutually between website.
2, the website that involves of APS protocol processes is a loopful anastomose point, and the communication reliability of protocol byte also decreases.
3, the APS protection is worked under the problematic situation of looped network, and the communication of APS protocol byte at this moment itself also is affected, and causes the agreement misoperation easily.
4,16 website limited in number of APS agreement have influenced the application surface of multiplex section protective ring.
Summary of the invention
The invention provides a kind of multiplex section shared loop protecting method, multiplex section shared loop protecting need use the APS agreement to make guard time prolong, protect the problem of reliability reduction and limit collar way station point number in the prior art to solve.
The inventive method comprises: in advance the protection passage between each website in the loop is connected into protection passage ring, when between two websites in the loop line fault taking place, carry out the following step:
After A, any end website of faulty line detect the alarm signal of line fault, send multiplex section remote bug indication information to faulty line opposite end website;
After B, faulty line two ends website detect the line fault alarm signal or receive multiplex section remote bug indication information; be bridged on the corresponding protection passage at the name a person for a particular job transmission/receive path of faulty line of our station respectively, finish professional switching from service aisle to the protection passage.
Described line fault comprises that the channel quality between disconnected fibre of the optical fiber between two websites or two websites is lower than the channel failure threshold of setting.
The trigger condition of described alarm signal is: the data code flow that website receives is lost or channel quality is lower than the channel failure threshold of setting.
Described multiplex section remote bug indication information sends by a specific overhead byte.
According to said method of the present invention, after any end website of faulty line detected the alarm signal disappearance, cancellation sent multiplex section remote bug indication information.
According to said method of the present invention, faulty line two ends website switches back normal service aisle with business from the protection passage after alarm signal disappears a setting-up time.
According to said method of the present invention, if the path trace byte that a website receives in the loop does not match, then abandon current reception data, and the sendaisle mistake connects warning information downstream.
When loop service aisle operate as normal, whether the protection passage is normally carried out periodicity detect.
Described periodicity detects and comprises the steps:
Periodically disconnect described protection passage ring at a selected website, make it to become a passage chain;
End at described passage chain inserts the test data code stream, at the other end data code flow that receives is detected, if data code flow that receives and transmission is consistent, judges that then described protection passage is normal, otherwise, judge described protection channel abnormal.
Described test data code stream is UNEQ (Un equipment, unloaded signal) the form code stream of VC4 (Virtual Capacity type 4, virtual container 4 types).
The beneficial effect that technical solution of the present invention is brought is as follows:
1, the present invention has simplified the existing protocol processing procedure, has improved protection speed, and protection switch time can add the loop delay time near the guard time of channel protection ring in theory.
2, the website of participation protective has only the two ends website of faulty line, between do not have complicated communications protocol, improved the reliability that protection is switched greatly.
3, between the website basically only by alarming transmission information, do not need other specialized protocols, reduce the possibility of misoperation greatly.
4, owing to there is not a K agreement, the numerical limitations of website has not been had yet, increased the application surface of multiplex section Loop Protection.
Description of drawings
Fig. 1 is a two-fibre two-way multi-section shared protection ring course of work schematic diagram;
Fig. 2 is the professional schematic diagram that transmits under the service aisle normal condition in the embodiment of the invention;
Fig. 3 is the disconnected fine schematic diagram of the optical fiber between the B-C website in the embodiment of the invention;
The end website B that Fig. 4 interrupts fine optical fiber for the embodiment of the invention carries out service aisle and protection passage bridge joint process schematic diagram;
Fig. 5 interrupts fine optical fiber other end website C for the embodiment of the invention and carries out service aisle and protection passage bridge joint schematic diagram;
Fig. 6 is the professional schematic diagram that transmits of the loop when detecting fault recovery in the embodiment of the invention;
Fig. 7 is in the embodiment of the invention after fault recovery a period of time, and business is switched back service aisle process schematic diagram by the protection passage;
Fig. 8 is that the protection passage detects schematic diagram in the embodiment of the invention.
Embodiment
The present invention is applied to the two-fibre two-way multi-section shared protection ring in the optical-fiber network; to the service aisle of looped network and the division and SDH/SONET (the Synchronous Optical Network of protection passage; Synchronous Optical Network) similar; the Multiplex Section Shared Protection Ring of a STM-N; its total N AU4; be numbered in the clockwise direction 1 to the time slot arrangement of N/2 as service aisle, be numbered N/2+1 to the AU4 time slot arrangement of N as protecting passage.The time slot arrangement of optical fiber is similar on the counter clockwise direction.The AU4 service aisle that is numbered m is protected by (N/2+m) individual AU4 of the protection passage ring of correspondence.
As shown in Figure 2, A, B; C, D, E; F, G, 8 websites of H form one two fine ring; between per two websites two optical fiber are arranged, every optical fiber can be divided into two class passages again, respectively corresponding service aisle/protection passage; between G, C two websites a two-way communication traffic is arranged; under the normal condition, professional path be G＜-H＜-A＜-B＜-C, walk solid-line paths.Fig. 3 to Fig. 7 has shown the service protection process and the later business recovery process of fault disappearance when between two websites the optical fiber fiber cut failure taking place.Elaborate the specific implementation process of the inventive method below in conjunction with accompanying drawing.
The present invention connects into the protection passage between each website in the loop protection passage ring in advance, shown in the dotted line loop among Fig. 2.
If optical-fiber line fault has taken place, disconnected fine as the optical fiber between the B-C, as shown in Figure 3, the SDH data code flow that this moment, B/C two websites can detect reception is lost LOS (the Loss of Signal that is sent, loss of signal alarm) alarm signal such as, send MSRDI (Multiplex Section RDI by a specific overhead byte K2 to fault optical fiber opposite end website simultaneously, the indication of multiplex section remote bug) information, the B/C website can be received the alarm of LOS or MSRDI like this, and fault has taken place the fibre circuit between the indication B/C website.
As shown in Figure 4, the B website monitors fault (receiving the alarm of LOS or MSRDI) back and initiates the protection action, by gapping switch f the sendaisle a of faulty line is bridged on its protection passage b; By gapping switch e the receive path c of faulty line being bridged to corresponding protection passage d gets on.
The C website monitors fault (receiving the alarm of LOS or MSRDI) and also initiates protection action, the transmission/receive path of faulty line is switched to the corresponding protection passage get on.Shown in the C website black line among Fig. 5.Business between the A-C has realized intercommunication by the protection passage at this moment.
After fiber failure disappeared between the B/C website, the B/C website monitored the recovery of fault, disappeared as alarms such as LOS, and the remote alarm of cancelling MSRDI simultaneously sends.At this moment, business is still by the protection channel transfer, and loop is professional to transmit schematic diagram as shown in Figure 6.
The B/C website detected after fault recovery a period of time (but set point was as 2 minutes); confirm that the service aisle between the B/C has recovered normal; gapping switch by separately such as e/f switch to business on normal service aisle a/c and the g/h from protection passage b/d respectively; finish the recovery of fault, as shown in Figure 7.
In the practical application, loop fault not only is the optical fiber fiber cut failure between two websites.When the data code flow that website receives lose or two websites between channel quality when being lower than the channel failure threshold of setting, also can send alarm signal, start the handoff procedure of service aisle to the protection passage.
The method that the present invention can adopt sendaisle to follow the trail of byte prevents that the mistake when multiple spot lost efficacy from connecting, if the path trace byte J1 that the passage receiving station receives is different with the j1 byte of expection, just think wrong company has taken place, this website abandons current reception data, and the sendaisle mistake connects warning information AIS (Alarm Indicate Signal, alarm indication signal) downstream.
When switching in order to guarantee to carry out passage, the protection passage is in normal condition, when the service aisle operate as normal of looped network, can specify a website whether to patrol and examine website normally as the protection passage, as shown in Figure 8, if the A website is the website of patrolling and examining of appointment, by timing or alternate manner, the periodic protection passage ring that disconnects, make it to become a passage chain, insert test code streams (as the UNEQ form code stream of VC4), then detect the bit error performance (as the B3 error code) that receives data code flow and other alarm (as the J1 mismatch etc.) at the place of passage end at the source of this passage chain end, continue to detect after a period of time (as 15 seconds), if produce with nowhere to turn to alert, represent that promptly the place termination is received data and the source end sends data consistent, judge that the protection passage is normal, again will protect passage to connect into ring again, and wait for and patrolling and examining next time; Otherwise, judge the protection channel abnormal, send corresponding alarm indication.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (10)
1, a kind of multiplex section shared loop protecting method is characterized in that in advance the protection passage between each website in the loop being connected into protection passage ring, when between two websites in the loop line fault taking place, carries out the following step:
After A, any end website of faulty line detect the alarm signal of line fault, send multiplex section remote bug indication information to faulty line opposite end website;
After B, faulty line two ends website detect the line fault alarm signal or receive multiplex section remote bug indication information; be bridged on the corresponding protection passage at the name a person for a particular job transmission/receive path of faulty line of our station respectively, finish professional switching from service aisle to the protection passage.
2, multiplex section shared loop protecting method as claimed in claim 1 is characterized in that, described line fault comprises that the channel quality between disconnected fibre of the optical fiber between two websites or two websites is lower than the channel failure threshold of setting.
3, multiplex section shared loop protecting method as claimed in claim 1 is characterized in that, the trigger condition of described alarm signal is: the data code flow that website receives is lost or channel quality is lower than the channel failure threshold of setting.
4, multiplex section shared loop protecting method as claimed in claim 1 is characterized in that, described multiplex section remote bug indication information sends by a specific overhead byte.
5, multiplex section shared loop protecting method as claimed in claim 1 is characterized in that, after any end website of faulty line detected the alarm signal disappearance, cancellation sent multiplex section remote bug indication information.
6, multiplex section shared loop protecting method as claimed in claim 5 is characterized in that, faulty line two ends website switches back normal service aisle with business from the protection passage after alarm signal disappears a setting-up time.
7, multiplex section shared loop protecting method as claimed in claim 1 is characterized in that, if the path trace byte that a website receives in the loop does not match, then abandons current reception data, and the sendaisle mistake connects warning information downstream.
8, multiplex section shared loop protecting method as claimed in claim 1 is characterized in that, when loop service aisle operate as normal, whether the protection passage is normally carried out periodicity detect.
9, multiplex section shared loop protecting method as claimed in claim 8 is characterized in that, described periodicity detects and comprises the steps:
Periodically disconnect described protection passage ring at a selected website, make it to become a passage chain;
End at described passage chain inserts the test data code stream, at the other end data code flow that receives is detected, if data code flow that receives and transmission is consistent, judges that then described protection passage is normal, otherwise, judge described protection channel abnormal.
10, multiplex section shared loop protecting method as claimed in claim 9 is characterized in that, described test data code stream is the unloaded signal format code stream of virtual container 4 types.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2004101040553A CN100345423C (en) | 2004-12-31 | 2004-12-31 | Multiplex section shared loop protecting method |
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| CNB2004101040553A CN100345423C (en) | 2004-12-31 | 2004-12-31 | Multiplex section shared loop protecting method |
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| CN1801768A true CN1801768A (en) | 2006-07-12 |
| CN100345423C CN100345423C (en) | 2007-10-24 |
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| CNB2004101040553A Active CN100345423C (en) | 2004-12-31 | 2004-12-31 | Multiplex section shared loop protecting method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008154826A1 (en) * | 2007-06-21 | 2008-12-24 | Huawei Technologies Co., Ltd. | Transmitting, receiving method and apparatus for realizing service data recovery |
| CN101877665A (en) * | 2009-04-29 | 2010-11-03 | 华为技术有限公司 | Ring network protecting method, network node and ring network |
| CN101141211B (en) * | 2007-02-27 | 2011-09-21 | 中兴通讯股份有限公司 | Device and method for guaranteeing multiplex section rearrangement consistency |
| CN101453288B (en) * | 2007-12-06 | 2011-11-16 | 华为技术有限公司 | Loop network protection method and network appliance |
| WO2011150746A1 (en) * | 2010-06-01 | 2011-12-08 | 中兴通讯股份有限公司 | Cascade system and method for realizing automatic circuit bridge connection |
| CN101667863B (en) * | 2009-02-25 | 2012-01-25 | 北京邮电大学 | Device and method for enhancing channel alarm triggering in multiplex section shared ring net protection |
| CN102386972A (en) * | 2011-10-24 | 2012-03-21 | 华为技术有限公司 | Method, device and system for detecting misconnection of optical fibers |
| CN101145842B (en) * | 2007-06-14 | 2012-04-18 | 中兴通讯股份有限公司 | A method for indicating remote bug |
| CN105515808A (en) * | 2014-09-26 | 2016-04-20 | 中兴通讯股份有限公司 | Method for carrying out switching exercise of multiplexing section ring and electronic device |
| WO2018059344A1 (en) * | 2016-09-29 | 2018-04-05 | 中兴通讯股份有限公司 | Method, apparatus, and system for multiplex section protection bidirectional switchover and computer storage medium |
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| US5341364A (en) * | 1992-06-02 | 1994-08-23 | At&T Bell Laboratories | Distributed switching in bidirectional multiplex section-switched ringtransmission systems |
| DE19648073A1 (en) * | 1996-11-20 | 1998-06-04 | Siemens Ag | Data flow rerouting method by line segment switching in ring network |
| CN1142640C (en) * | 1999-05-17 | 2004-03-17 | 华为技术有限公司 | Communication link protection method for chain-type optical fibre network |
| CN1126331C (en) * | 1999-11-04 | 2003-10-29 | 深圳市中兴通讯股份有限公司 | Automatically protected switching method and device in high rate SDH loop |
| KR20020033220A (en) * | 2000-10-30 | 2002-05-06 | 구자홍 | A method of msspring communication for optical communication system |
| CN1222821C (en) * | 2002-07-01 | 2005-10-12 | 华为技术有限公司 | Optical channel protector and method based on WDM layer |
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| CN101141211B (en) * | 2007-02-27 | 2011-09-21 | 中兴通讯股份有限公司 | Device and method for guaranteeing multiplex section rearrangement consistency |
| CN101145842B (en) * | 2007-06-14 | 2012-04-18 | 中兴通讯股份有限公司 | A method for indicating remote bug |
| WO2008154826A1 (en) * | 2007-06-21 | 2008-12-24 | Huawei Technologies Co., Ltd. | Transmitting, receiving method and apparatus for realizing service data recovery |
| CN101453288B (en) * | 2007-12-06 | 2011-11-16 | 华为技术有限公司 | Loop network protection method and network appliance |
| CN101667863B (en) * | 2009-02-25 | 2012-01-25 | 北京邮电大学 | Device and method for enhancing channel alarm triggering in multiplex section shared ring net protection |
| US9065758B2 (en) | 2009-04-29 | 2015-06-23 | Huawei Technologies Co., Ltd. | Ring network protection method, network node and ring network |
| US9137147B2 (en) | 2009-04-29 | 2015-09-15 | Huawei Technologies Co., Ltd. | Ring network protection method, network node and ring network |
| CN101877665A (en) * | 2009-04-29 | 2010-11-03 | 华为技术有限公司 | Ring network protecting method, network node and ring network |
| US8830824B2 (en) | 2009-04-29 | 2014-09-09 | Huawei Technologies Co., Ltd | Ring network protection method, network node and ring network |
| WO2010124557A1 (en) * | 2009-04-29 | 2010-11-04 | 华为技术有限公司 | Ring network protection method, network node and ring network |
| WO2011150746A1 (en) * | 2010-06-01 | 2011-12-08 | 中兴通讯股份有限公司 | Cascade system and method for realizing automatic circuit bridge connection |
| CN102386972B (en) * | 2011-10-24 | 2014-12-24 | 华为技术有限公司 | Method, device and system for detecting misconnection of optical fibers |
| CN102386972A (en) * | 2011-10-24 | 2012-03-21 | 华为技术有限公司 | Method, device and system for detecting misconnection of optical fibers |
| CN105515808A (en) * | 2014-09-26 | 2016-04-20 | 中兴通讯股份有限公司 | Method for carrying out switching exercise of multiplexing section ring and electronic device |
| CN105515808B (en) * | 2014-09-26 | 2019-11-05 | 中兴通讯股份有限公司 | A kind of pair of multiplex section ring switch the method and electronic equipment of manoeuvre |
| WO2018059344A1 (en) * | 2016-09-29 | 2018-04-05 | 中兴通讯股份有限公司 | Method, apparatus, and system for multiplex section protection bidirectional switchover and computer storage medium |
| CN107888280A (en) * | 2016-09-29 | 2018-04-06 | 中兴通讯股份有限公司 | The two-way reverse method of multiplex section protection, apparatus and system |
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