CN1870509A - Method and device for raising protection stability of multi-section when clock plate switchover - Google Patents
Method and device for raising protection stability of multi-section when clock plate switchover Download PDFInfo
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- CN1870509A CN1870509A CN 200510040322 CN200510040322A CN1870509A CN 1870509 A CN1870509 A CN 1870509A CN 200510040322 CN200510040322 CN 200510040322 CN 200510040322 A CN200510040322 A CN 200510040322A CN 1870509 A CN1870509 A CN 1870509A
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Abstract
This invention discloses a method and a device for increasing the protection stability of a multiplex section when switching clock boards suitable for synchronous digital communication devices including an optical board, primary and standby clock boards and a cross board with an automatic protection switch protocol module of a multiplex section, in which, the method includes: in the protection of the multiplex section, the optical board picks up the spending bytes relating to the protection of the section on the optical path, the cross board carries out multi-frame check to the received spending bytes and the section alarm and filters the error codes of the bytes and the alarm based on the operating state of the clock board.
Description
Technical field
The present invention relates to the optical transmission field, relate in particular to a kind of method and device that improves protection stability of multi-section when clock plate switchover.
Background technology
The stability of multiplex section protection is extremely important for SDH (Synchronos Digital Hierarchy synchronous digital hierarchy) equipment; it is online that SDH equipment is widely used in backbone transport; if the multiplex section protection instability causes the transport service interruption, the loss that causes also is huge.At present a lot of methods have been studied aspect multiplex section protection stable improving by each transmission equipment manufacturer, have formed some patented technologies.The present invention proposes is the method that clock board improves protection stability of multi-section when switching.
Most SDH equipment all provides backup protection to important veneer, such as clock board, cross board etc.In case veneer damages or fault, also has standby board.Clock board switches the master/backup clock plate that refers to SDH equipment and switches.Clock board provides the clock of entire equipment even transmission network as one of most important veneer in the synchronous transmission equipment.Clock board if can not realize taking over seamlessly, just makes the error code that occurs moment by business, expense and the alarm of bus transmission in the process of switching.Cross board need carry out multiplex section protection exchanging according to these expenses and alarm, and the error code of expense and alarm has directly influenced the stability of the multiplex section protection exchanging of equipment.This problem all exists in the system that the clock board backup protection is provided, and can not be solved well.
From existing patented technology, one of direction of research is to realize that chock smotthing switches.Phase place by the phase demodulation clock of adjusting phase-locked loop output is arranged, carry out frequency compensated method and realize that chock smotthing switches.Also have active and standby plate phase-locked loop output clock is carried out frequency multiplication, make that the clock one-period time after the frequency multiplication realizes taking over seamlessly less than taking over seamlessly patient phase range.Generally speaking, all be not have the error code switching problem from the angle research clock that dwindles the master and spare clock plate phase position difference, this scheme clock under master/backup clock plate situation all on the throne is often switched effect relatively good (such as the operation of webmaster).If will realize pulling out taking over seamlessly of plate, also to solve the problem of notice standby plate before clock board releasing slots position earlier, even otherwise the master and spare clock plate phase position unanimity still has the no clock status of moment in the time of switching.In relating to the method for pulling out the plate switching, a kind of method that realizes the clock board switching by mechanical linkage is just arranged, mechanical device moves at the veneer spanner, clock board is not as yet before the releasing slots position, carrying out clock by sensitive switch earlier switches, but this class linkage failure rate is than higher, and the long-time reliability of using is not strong.At present, prior art can't accomplish well that clock board pulls out plate and takes over seamlessly problem.In addition, be not disclosed in the relevant technologies that how to improve the stability of multiplex section protection exchanging under the clock board switch instances yet.
Since clock board pulls out plate and can not accomplish to take over seamlessly fully, reliably, that situation that influences multiplex section rearrangement just needs to solve by other approach.The present invention proposes a kind of thought of filtering based on error code and address this problem, is exactly to indicate the error code that filters expense on the bus by the clock board running status in simple terms, realizes the stable a kind of method of multiplex section rearrangement.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method and device that can effectively improve multiplex section protection exchanging stability when plate switches that pull out at clock board.
For achieving the above object; the present invention proposes a kind of method that improves protection stability of multi-section when clock plate switchover; be applicable to the synchronous digital communication apparatus; comprise tabula rasa, the master/backup clock plate that connects by system bus, the cross board that has multiplex section APS protocol module; it is characterized in that, comprise the steps:
Step 1 in multiplex section protection, is extracted the overhead byte relevant with multiplex section protection on the light path by described tabula rasa, by described cross board the multiframe verification is done in the described overhead byte and the multiplex section alarm that receive;
Step 2, described cross board are filtered the error code of described overhead byte and multiplex section alarm according to the clock board running status.
The method of above-mentioned raising protection stability of multi-section when clock plate switchover, wherein, just efficiency confirmed for all consistent byte of continuous some frames and multiplex section alarm for described cross board.
The method of above-mentioned raising protection stability of multi-section when clock plate switchover; wherein, before carry out step 2, comprise that also one judges the step that multiframe is whether consistent; if it is consistent then carry out the determining step whether clock board switches, if inconsistent then repeat step 1.
The method of above-mentioned raising protection stability of multi-section when clock plate switchover; wherein; in carrying out the determining step whether clock board switch; if clock board switches; then carry out step 2; if clock board does not switch, then transmit the change information of K byte and multiplex section alarm to the multiplex section APS protocol module of described cross board.
The method of above-mentioned raising protection stability of multi-section when clock plate switchover; wherein; in step 1, also further comprise frame number that the error code of judging the alarm of described overhead byte and multiplex section continues whether greater than the step of the frame number of verification, if greater than the frame number of verification then carry out step 2.
The method of above-mentioned raising protection stability of multi-section when clock plate switchover, wherein, described clock board is in the situation of switching state, comprising: the clock board operating state is undesired by normally becoming, and is perhaps changed to normally by undesired; The clock board activestandby state is by main standby with becoming, perhaps by the standby master's usefulness that becomes.
In order to realize above-mentioned purpose better, the present invention also provides a kind of device that adopts said method, comprise: tabula rasa, the master/backup clock plate that connects by system bus, the cross board that has multiplex section APS protocol module, described clock board is used for providing clock to described master/backup clock plate, tabula rasa, cross board and system bus, described tabula rasa is used for receiving and sending overhead byte, and described cross board is used to monitor the running status of described clock board and receives and send overhead byte; It is characterized in that; in multiplex section protection; extract the overhead byte relevant on the light path by described tabula rasa with multiplex section protection; by described cross board the multiframe verification is done in the described overhead byte and the multiplex section alarm that receive, described cross board filters the error code of described overhead byte and multiplex section alarm according to the clock board running status.
Said apparatus, wherein, just efficiency confirmed for all consistent byte of continuous some frames and multiplex section alarm for described cross board.
Above-mentioned device wherein, is provided with a clock board running status byte on system bus, the corresponding byte of clock board, the wherein operating state and the activestandby state of the different bits difference telltable clock plates of byte.
The another kind of method of above-mentioned device wherein, is provided with the holding wire of one group of telltable clock plate operating state of living in and activestandby state at each clock board on backboard, described holding wire is connected to described cross board.
Adopt method and apparatus of the present invention, compared with prior art, this method improvement cost is low, obviously improves the stability of multi-section when clock plate switchover protection.Test from SDH equipment, after finding to adopt this technology, protection stability of multi-section when clock plate switchover improves clearly.Do not adopt this technology, the probability that switching unusually appears in multi-section when clock plate switchover is probably between 30%～40%.And after having adopted this technology, the probability that multiplex section is switched unusually is lower than 1%.
Description of drawings
Figure 1 shows that the systematic schematic diagram of the method that improves protection stability of multi-section when clock plate switchover;
Figure 2 shows that the process chart of the method that improves protection stability of multi-section when clock plate switchover.
Embodiment
For making feature of the present invention, purpose and function have further cognitive and understanding, conjunction with figs. is described in detail as follows now:
As shown in Figure 1, hardware configuration of the present invention comprises tabula rasa 10, clock board 11,12, intersection veneer (APS processing module) 13, system bus 14 and sub-frame and backboard etc.Backboard is fixed on the sub-frame, and each veneer is inserted in the respective grooves position of backboard, tabula rasa 10, and clock board 11,12, the veneer (APS processing module) 13 that intersects waits each veneer to be connected to each other by the system bus 14 of backboard.
Because this clock board (clock board 11,12) has adopted main-apparatus protection, current active clock plate 11 provides clock to system bus 14, intersection veneer 13 and tabula rasa 10 etc.If current active clock plate 11 pulls out plate or damage, clock board can automatically switch to standby clock board 12.
Tabula rasa 10 receives professional from the light mouth, and K byte and the alarm of detected multiplex section that receives passed to intersection veneer 13 by system bus 14.APS (automatic protection switching, APS) module is positioned on the intersection veneer 13, and the veneer 13 that intersects is finished the protection of multiplex section and switched.The K byte and the multiplex section alarm that pass over from system bus 14 are exactly the essential information that the APS module is switched.The APS module draws the K byte that need to send by computing, passes to tabula rasa 10 by system bus 14, and the APS module that sends to adjacent network element by tabula rasa 10 is handled again.
Further specify the method for two kinds of monitoring clock plate running statuses at first, below.
A kind of method is: clock board running status byte of design on system bus 14, the corresponding byte of clock board.The different bits of byte are the operating state and the activestandby state of telltable clock plate respectively.Byte low 6 (BIT0～BIT5) is used for indicating operating status, according to the fixed cycle in certain two numerical value change.(BIT6～BIT7) is used for active and standby indication, and veneer is in mainly uses state, and then high 2 equal 1, are in stand-by state and then equal 0 for byte high 2.Other numerical value all is abnormal.
Another kind method is: design one group of holding wire on System Backplane each clock board, holding wire can telltable clock plate current working state and activestandby state.Holding wire is connected on the intersection veneer 13, the running status of the watchdog timer plate that intersection veneer 13 can be real-time.For example, holding wire 0 represents that this clock board is working properly during for high level, and low level represents that work is undesired, and holding wire 1 is represented this clock board for high level and be in main usefulness that low level is represented standby.
Secondly, 3 frame checks are done in the K byte and the multiplex section alarm that receive.Because multiframe verification meeting increases the switching time of whole networking, so the verification frame number of multiframe verification can not be too many.
Once more, K byte and multiplex section alarm carrying out error code are filtered.
Clock board is in of short duration loss of clock state in the moment of pulling out plate, and this state duration is uncertain, with the order of backboard contact pin disengaging and people's operation much relations is arranged.Fast can finish switching within 3 frames, slow may surpass 3 frames.3 frame checks just can solve for the error code within 3 frames, can not influence switching of multiplex section protection.Error code for surpassing 3 frames just is not directly passed to the APS module if do not filter, and will influence normal multiplex section rearrangement.
The error code identification of K byte and multiplex section alarm is difficulty relatively, but the switching of clock board running status identification is easy to.Key of the present invention is exactly to utilize the variation of clock board running status to discern the switching of clock board.According to Figure 2 shows that a kind of process chart that improves the method for protection stability of multi-section when clock plate switchover shown in the present.Comprise the steps:
In above-mentioned steps, as long as clock board is in switching state, just wouldn't detecting to K byte and multiplex section alarm.When detecting, clock board has been finished switching next time, and K byte and multiplex section alarm are stable, and error code just can not pass to the APS module.
More than; though disclose the preferred embodiment of the present invention; but described content is not to be used to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; can carry out suitable modification and improvement to the present invention, so protection scope of the present invention should be as the criterion with appended claim institute confining spectrum.
Claims (8)
1, a kind of method that improves protection stability of multi-section when clock plate switchover; be applicable to the synchronous digital communication apparatus; comprise tabula rasa, the master/backup clock plate that connects by system bus, the cross board that has multiplex section APS protocol module, it is characterized in that, comprise the steps:
Step 1, in multiplex section protection, extract the overhead byte relevant on the light path by described tabula rasa with multiplex section protection, by described cross board the multiframe verification is done in the described overhead byte and the multiplex section alarm that receive, judge whether multiframe is consistent, if it is consistent then carry out the determining step whether clock board switches, if inconsistent then repeat step 1;
Step 2; described cross board filters the error code of described overhead byte and multiplex section alarm according to the clock board running status; in carrying out the determining step whether clock board switch; if clock board switches; then carry out step 2; if clock board does not switch, then transmit the change information of K byte and multiplex section alarm to the multiplex section APS protocol module of described cross board.
2, the method for raising protection stability of multi-section when clock plate switchover according to claim 1; it is characterized in that; in step 1; also further comprise frame number that the error code of judging the alarm of described overhead byte and multiplex section continues whether greater than the step of the frame number of verification, if greater than the frame number of verification then carry out step 2.
3, the method for raising protection stability of multi-section when clock plate switchover according to claim 1, it is characterized in that, be in the situation of switching state at clock board described in the step 2, comprising: the clock board operating state is undesired by normally becoming, perhaps by undesired change to normal; The clock board activestandby state is by main standby with becoming, perhaps by the standby master's usefulness that becomes.
4, the method for raising protection stability of multi-section when clock plate switchover according to claim 1; it is characterized in that; in step 2; the method of watchdog timer plate running status is included in the holding wire that one group of telltable clock plate operating state of living in and activestandby state are set on the backboard, and described holding wire is connected to described cross board.
5, the method for raising protection stability of multi-section when clock plate switchover according to claim 1; it is characterized in that; in step 2; the method of watchdog timer plate running status also is included in a state operation byte is set on the system bus, wherein the operating state and the activestandby state of the different bits difference telltable clock plates of byte.
6, according to the device that adopts the described method of claim 1, comprise: by tabula rasa, master/backup clock plate, the cross board that has multiplex section APS protocol module, the backboard of system bus connection, described clock board is used for providing clock to described master/backup clock plate, tabula rasa, cross board and system bus, described tabula rasa is used for receiving and sending overhead byte, and described cross board is used to monitor the running status of described clock board and receives and send overhead byte; It is characterized in that; in multiplex section protection; extract the overhead byte relevant on the light path by described tabula rasa with multiplex section protection; by described cross board the multiframe verification is done in the described overhead byte and the multiplex section alarm that receive, described cross board filters the error code of described overhead byte and multiplex section alarm according to the clock board running status.
7, device according to claim 6 is characterized in that, the holding wire of one group of telltable clock plate operating state of living in and activestandby state is set at each clock board on backboard, and described holding wire is connected to described cross board.
8, device according to claim 6 is characterized in that, a clock board running status byte is set on system bus, the corresponding byte of clock board, the wherein operating state and the activestandby state of the different bits difference telltable clock plates of byte.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510040322XA CN100375444C (en) | 2005-05-25 | 2005-05-25 | Method and device for raising protection stability of multi-section when clock plate switchover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510040322XA CN100375444C (en) | 2005-05-25 | 2005-05-25 | Method and device for raising protection stability of multi-section when clock plate switchover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1870509A true CN1870509A (en) | 2006-11-29 |
| CN100375444C CN100375444C (en) | 2008-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB200510040322XA Expired - Fee Related CN100375444C (en) | 2005-05-25 | 2005-05-25 | Method and device for raising protection stability of multi-section when clock plate switchover |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010012192A1 (en) * | 2008-07-30 | 2010-02-04 | 中兴通讯股份有限公司 | A method for synchronizing the switching state of the intercross unit in network element |
| 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 |
| CN101145882B (en) * | 2007-08-01 | 2012-05-09 | 中兴通讯股份有限公司 | Implementation method for quick protective switch |
| CN112114616A (en) * | 2020-08-04 | 2020-12-22 | 深圳市宏电技术股份有限公司 | Switching method of real-time clock, electronic equipment and computer storage medium |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100342522B1 (en) * | 2000-09-16 | 2002-06-28 | 윤종용 | Bit-rate independent optic-electrical cross-connect device in optical transmitting system |
| CN1306744C (en) * | 2002-12-21 | 2007-03-21 | 中兴通讯股份有限公司 | Clock circuit for optical transmission belt with error correction system |
| KR20040066402A (en) * | 2003-01-18 | 2004-07-27 | 삼성전자주식회사 | dual switching system using a clock change |
| CN100370795C (en) * | 2004-09-09 | 2008-02-20 | 烽火通信科技股份有限公司 | Method for implementing pseudo loop-back clock of optical network unit in Ethernet passive optical network system |
-
2005
- 2005-05-25 CN CNB200510040322XA patent/CN100375444C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101145882B (en) * | 2007-08-01 | 2012-05-09 | 中兴通讯股份有限公司 | Implementation method for quick protective switch |
| WO2010012192A1 (en) * | 2008-07-30 | 2010-02-04 | 中兴通讯股份有限公司 | A method for synchronizing the switching state of the intercross unit in network element |
| CN112114616A (en) * | 2020-08-04 | 2020-12-22 | 深圳市宏电技术股份有限公司 | Switching method of real-time clock, electronic equipment and computer storage medium |
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| Publication number | Publication date |
|---|---|
| CN100375444C (en) | 2008-03-12 |
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Granted publication date: 20080312 Termination date: 20140525 |