CN101951303A - Method and node equipment for implementing bidirectional linear protection switch of multiplex section - Google Patents
Method and node equipment for implementing bidirectional linear protection switch of multiplex section Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0057—Operations, administration and maintenance [OAM]
- H04J2203/006—Fault tolerance and recovery
Abstract
The invention provides a method and node equipment for implementing bidirectional linear protection switch of a multiplex section. The method comprises that: the node equipment calculates a bridging request with highest priority in a protection group, and then performs bridging and switch of services corresponding to the bridging request according to a first decision mode. By reducing three-time interaction of protocol bytes into one-time interaction in the switch process and reducing the treatment such as corresponding decision and the like into one time, the method and the node equipment can greatly improve the switch efficiency of the multiplex section 1: N bidirectional linear protection.
Description
Technical field
The present invention relates to the optical-fiber network technical field, particularly relate to a kind of method and node device of realizing that the protection of multiplex section bidirectional linear is switched.
Background technology
At standard (SDH (Synchronous Digital Hierarchy G.841; SDH (Synchronous Digital Hierarchy)) network protection structure) Gui Ding APS (Automatic Protection Switched; APS) in the agreement, the implementation that multiplex section 1:N bidirectional protective is switched is finished and switched in strict accordance with 3-phase (the interaction protocol byte is three times between two nodes).The far-end request is carried out the bridge joint of far-end request signal during for the highest request, and the identical Working service signal of signal numbering indication in the K2 byte of reception and the K1 byte of transmission is carried out switching of this Working service.As shown in Figure 1, it is as follows to finish the process of switching according to 3-phase:
Initial node device two ends all send NR0,0 signaling (NR is not for there being request, request bridge joint signal and the bridge joint signal all be 0).
When the left end node device detects signal 2 deteriorations, send SD2,0 (request opposite end bridge joint signal 2);
After the right-hand member node device is finished the signal Bridge 2 and connect, send RR2,2 (reverse request, the request opposite end is bridge joint signal 2 also, and informs that this side of opposite end finished the signal Bridge 2 and connect);
The left end node device is finished the bridge joint of signal 2 and is switched, and sends SD2,2 (the notice opposite end has been finished the signal Bridge 2 and connect);
The right-hand member node device is finished signal 2 and is switched.
When the right-hand member node device detects signal 3 interruptions, send SF3,2 (request opposite end bridge joint signals 3, the notice opposite end is still the state of bridge joint signal 2 at present)
The bridge joint of left end node device cancel message 2 is switched, and carries out the bridge joint of signal 3, then, sends RR3,3 (reverse request, request opposite end bridge joint signal 3, and inform that this side of opposite end finished signal 3 bridge joints);
The right-hand member node device is finished the bridge joint of signal 3, sends SF3,3 (the notice opposite end has been finished signal 3 bridge joints)
The left end node device is finished switching of signal 3.
When the right-hand member node device detects the fault recovery of service aisle 3, send WTR3,3 (the notice opposite end enters the Wait-to-Restore state of switching)
The left end node device still has deterioration because of service aisle 2, so after the switching of cancel message 3, send SD2,3 (request opposite end bridge joint signal 2 is because SD priority is higher than WTR);
After the switching and finish the signal Bridge 2 and connect of right-hand member node device cancel message 3, send RR2,2 (reverse request, the request opposite end is bridge joint signal 2 also, and informs that this side of opposite end finished the signal Bridge 2 and connect);
The left end node device is finished the bridge joint of signal 2 and is switched, and sends SD2,2;
The right-hand member node device is finished switching of signal 2 again.
As seen, after node device (local terminal) detects signal and changes, notify the opposite end bridge joint corresponding signal earlier, reinform the local terminal bridge joint behind the bridge joint of opposite end, local terminal carries out bridge joint to be switched, and the opposite end is finished and switched then, and signaling need be switched by three mutual bridge joints that just execute two ends, the decision-making of the APS at two ends respectively needs to carry out twice in each bridge joint reversed process, and business switching time is longer.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method and node device of realizing that the protection of multiplex section bidirectional linear is switched is provided, and with under situation about not influencing with the equipment interconnection of operation standard agreement, improves the protection of multiplex section 1:N bidirectional linear and switches efficient.
In order to address the above problem, the invention provides a kind of method that realizes that the protection of multiplex section bidirectional linear is switched, comprising:
After node device calculates the highest bridge joint request of protection in-group priority, carry out the corresponding professional bridge joint of this bridge joint request and switch according to first decision-making mode.
Further, said method also has following characteristics: described node device carries out the corresponding professional bridge joint of this bridge joint request according to first decision-making mode and the step of switching comprises: described node device is first decision-making mode as if what judge the configuration of this node device, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
Further, said method also has following characteristics: described node device carries out the corresponding professional bridge joint of this bridge joint request according to first decision-making mode and the step of switching comprises:
What the MSOH K2 that described node device receives as if judgement indicated is first decision-making mode, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
Further, said method also has following characteristics:
The MSOH K2 indication that described node device if judge receives be after the step of first decision-making mode, also comprise: preserve described first decision-making mode;
Described according to first decision-making mode carry out the corresponding professional bridge joint of this bridge joint request and the step of switching after, also comprise: the MSOH K2 that sends described first decision-making mode of indication.
Further, said method also has following characteristics: described according to first decision-making mode carry out the corresponding professional bridge joint of this bridge joint request and the process of switching in, also comprise:
Described node device is if receive the control information of switching that webmaster issues, and judges that described to switch the decision-making mode that control information carries different with the decision-making mode of current execution, then reports the decision-making mode information that do not match to described webmaster.
In order to address the above problem, the present invention also provides a kind of node device, comprises at least one working port and a protection port, and described working port and described protection port and APS (APS) module are mutual, wherein,
Described APS module, be used to calculate the highest bridge joint request of protection in-group priority after, carry out the corresponding professional bridge joint of this bridge joint request and switch according to first decision-making mode.
Further, above-mentioned node device also has following characteristics:
Described APS module, specifically being used for as if what judge the configuration of this node device is first decision-making mode, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
Further, above-mentioned node device also has following characteristics:
Described APS module, what the MSOH K2 byte that specifically is used for receiving as if judgement was indicated is first decision-making mode, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
Further, above-mentioned node device also has following characteristics:
Described APS module also is used to preserve described first decision-making mode, also is used to send the MSOH K2 of described first decision-making mode of indication after finishing bridge joint and switching.
Further, above-mentioned node device also has following characteristics:
Described APS module also is used for if receive the control information of switching that webmaster issues, and judges that described to switch the decision-making mode that control information carries different with the decision-making mode of current execution, then reports the decision-making mode information that do not match to described webmaster.
The invention provides a kind of method and node device of realizing that the protection of multiplex section bidirectional linear is switched; be reduced to once mutual alternately three times with protocol byte in the reversed process; correspondingly decision-making waits and handles also for once; can improve the efficient of switching of multiplex section 1:N bidirectional linear protection greatly; thereby remedy the deficiency of other processing unit; specifically, carry out the multiplex section protection decision-making and obtained optimization, the so corresponding requirement that will reduce other processing units.For example, switch after efficient improves, the corresponding requirement that can reduce to the fast detecting alarm, the fast detecting alarm is finished by hardware usually, so can reduce some parameter requests to hardware relatively.Simultaneously, announcement phase pattern has also strengthened controllability.
Description of drawings
Fig. 1 is the APS message flow schematic diagram that 3-phase is switched in the protection of multiplex section 1:N bidirectional linear;
Fig. 2 is the schematic diagram of the node device of one embodiment of the invention;
The flow chart of the method that Fig. 3 switches for the protection of the realization multiplex section bidirectional linear of the embodiment of the invention;
Fig. 4 is the APS message flow schematic diagram that 1-phase is switched in multiplex section bidirectional linear protection that the present invention proposes;
Fig. 5 is a 1-phase node device of the present invention and the APS message flow schematic diagram that docks of 3-phase node device.
Embodiment
At G.8031 (Ethernet protection switch) with G.8131 in (T-MPLS linear protection switching); reversed process is improved; introduce 1-phase (only needing a mutual protocol byte between two nodes) and switch implementation, improved the efficient of switching of 1:N bidirectional linear protection effectively.G.8031 and be to adopt fixed form to carry out the bidirectional linear protection to switch G.8131.
With reference to above standard code; the present invention proposes also to introduce the execution of 1-phase in the two-way 1:N linear protection of multiplex section, mainly be that phase is identified in the signaling, shows the decision-making mode of local terminal to the opposite end; consult the decision-making mode at two ends, protect decision-making by unified pattern.Also consider simultaneously butt joint to original processing.The method that this paper proposes also is applicable to G.873.1 OTN (Optical Transport Network, the optical transfer network) linear protection of regulation.
Main thought of the present invention is: the 1-phase method is adopted in multiplex section 1:N bidirectional linear protection decision-making; after this node calculates the highest bridge joint request of protection in-group priority; then directly finish the corresponding professional bridge joint of this largest request and switch; and send this request to the opposite end; after the opposite end receives request; if be confirmed to be largest request, also correspondingly finish bridge joint and switch, this moment business recovery.
The b6-b8 of MSOH K2 byte, existing standard is defined as follows:
000 sky
001-101 reserves
110MS-RDI (indication of multiplex section remote bug)
111MS-AIS (Multiplex Section AIS)
The present invention will use wherein reserved byte to consult to indicate the phase pattern (decision-making mode) at two ends, and carry out corresponding decision-making according to match condition.
Having used the inventive method at present on the MSP (Multiplex Section Protection, multiplex section protection) that inserts side in PTN (Packet Transport Network, the Packet Transport Network) equipment improves protection and switches efficient.The schematic diagram of the node device of one embodiment of the invention, as shown in Figure 2.
The present invention is at the b6-b8 of MSOH K2 byte, and increase is defined as follows:
0011-phase
0113-phase
The multiplex section 1:1 bidirectional protective group of setting up comprises STM port #A-1 and the #B-1 of ply-yarn drill A and B; wherein #A-1 is a working port; #B-1 is the protection port; 1:N bidirectional protective group comprises N working port and 1 protection port; 1:N can only protect a service aisle simultaneously; N service aisle shared a protection passage, so generally determine to protect the business of which service aisle according to priority.
Ply-yarn drill A detects the warning information of #A-1 port, the warning information of ply-yarn drill B detection #B-1 port and the K1 that receives, K2 byte; be sent to the APS decision-making module of master control borad by communication module between plate; the APS decision-making module also receives the switching control command that Network Management Equipment issues the protection group of this node device, and the user can be provided with the two-way decision-making mode of multiplex section 1:N etc.
The user is when the multiplex section protection group of certain end equipment of configuration, and the decision-making mode that can indicate this protection group adopts 1-phase, or 3-phase, and like this, this end equipment b6-b8 in the K2 byte that the protection group sends will fill out corresponding value.
The flow chart of the method that Fig. 3 switches for the protection of the realization multiplex section bidirectional linear of the embodiment of the invention as shown in Figure 3, comprises following step:
S10, node device are according to warning information or receive the K byte or switch the port of control equal excitation effect, search the multiplex section protection group id (ID) that obtains disposing;
Node device receives warning information, switches control information, then initiates local bridge joint request to the APS module, also can be directly these information to be inputed to the APS module, and the APS module is handled as local bridge joint request.
Local request and/or far-end request in S20, the relatively protection group of this node device, the business that calculates the highest largest request of protection in-group priority and request is numbered;
The request that extracts the opposite end from the signaling that the opposite end sends over is the far-end request, and local largest request is an all working passage and the highest bridge joint request of bridge joint request medium priority of protecting passage in the local protection group.Local largest request is the bridge joint request when local certain passage change and just should calculate (i.e. warning information by each passage in this locality protection group, switch the generation of priority ratio of control information); extract from multiplex section when the far-end request then receives the opposite end signaling, this process specifically can be referring to G.8131.
Determine the request that priority is the highest, could guarantee that two ends carry out consistent bridge joint to the passage at this request place and switch.If the highest request is local request, then should ask opposite end by corresponding signaling (as SD, the SF etc.) announcement of request; If the far-end request, then the signaling of Fa Songing is RR (reverse request, expression are one and confirm request).
The decision-making mode of the K2 indication that S30, basis receive is carried out bridge joint and is switched;
Judge the information of the K2 that receives, promptly b6-b8 extracts the decision-making mode information of opposite end from K2, if receiving the b6-b8 of K2 is 011 o'clock, preserving decision-making mode mode is 3-phase, by the 3-phase execution decision-making (summary) of standard, and the b6-b8 that sends K2 fills in 011, and indication 3-phase finishes;
If it is 1-phase that webmaster is provided with the two-way decision-making mode of multiplex section 1:N, node device (APS decision-making module) is if judge that the decision-making mode of webmaster setting is different with the decision-making mode of the current operation of this node, then report decision-making mode not match information to Network Management Equipment, be in order to give a kind of prompting of client, similar alarm prompt finishes.
If receive K2 indication 1-phase, preserving executive mode mode is 1-phase, turns to step S40.Indicate other values if receive K2, judge the situation that local terminal is provided with, if equipment is 3-phase, the 3-phase that presses standard carries out decision-making (summary), otherwise turns to step S40.
The bridge joint of the business numbering of the request of S40, execution priority maximum indication and switching.
If largest request is the far-end request, change S50; Otherwise transmission protocol byte content is: request type is a largest request, and the business that requested service is numbered and the bridging traffic numbering all has been the largest request indication is numbered, and b6-b8 indicates 1-phase among the K2, finishes;
S50, transmission protocol byte content are: request type is RR (reverse request), and the business that requested service is numbered and the bridging traffic numbering all has been the largest request indication is numbered, and b6-b8 indicates 1-phase among the K2, finishes.
If it is 3-phase that management plane is provided with the two-way decision-making mode of multiplex section 1:N, node then reports decision-making mode not match information to Network Management Equipment if judge that the decision-making mode of webmaster setting is different with the decision-making mode of local storage, is in order to give a kind of prompting of client, similar alarm prompt finishes.
After finishing decision-making, by communication module between plate bridge joint is switched the result of decision and pass to ply-yarn drill A and ply-yarn drill B execution, transmission K1, K2 pass to ply-yarn drill B and send by the protection port.
The above S50 of Chu Liing, whether the 1-phase process sends is that RR is that it doesn't matter, because two ends have been finished bridge joint and have been switched, still send RR, mainly be when considering and moving the SDH equipment interconnection of standard agreement, guarantee that the APS agreement still can normally move, last that send is NR and other regulation is only used the standard code of 1-phase.
Introduce this method and can effectively remedy the influence of following problems to switching time: 1, the efficiency of transmission of communication module is low between plate; 2, APS decision-making module decision-making execution efficient is low in the master control; 3, the execution efficient of ply-yarn drill execution action is low.
Professional switching time with above-mentioned several all be related, after reducing interaction times, the requirement of tackling other parts mutually can the appropriateness reduction.
Fig. 4 is the APS message flow schematic diagram that 1-phase is switched in multiplex section bidirectional linear protection that the present invention proposes; in this flow process; at least one equipment of left and right end node devices is set to the 1-phase pattern; in the process that two end node devices are shaken hands; or protect the b6-b8 among the K2 that sends in the process of switching to indicate 1-phase, the protection reversed process is as follows:
Initial node device two ends all send NR0,0 signaling;
When the left end node device detects signal 2 deteriorations, and it is the highest to calculate the priority of SD bridge joint request of signal 2, then finishes bridge joint and switches, so send SD2,2 (request opposite end bridge joint signals 2);
The right-hand member node device is also finished the bridge joint of signal 2 and is switched if the bridge joint Request Priority of confirmation signal 2 is the highest, sends RR2,2.The back process is handled similar.
As seen by top, by sending SD2,2 bridge joints of promptly having finished two ends are switched, and switch implementation and are simplified, and simultaneously, the degree of transitivity of APS signaling has reduced, and corresponding consumed time has also reduced, and switch that efficient is corresponding to be improved.
Fig. 5 is a 1-phase node device of the present invention and the APS message flow schematic diagram that docks of 3-phase node device; suppose that the left end node device is set to 1-phase; the right-hand member node device is set to existing node device, and (existing node device all is to carry out by 3-phase; can not detect phase and send the phase mode from K2), the protection reversed process is as follows:
Initial two ends all send NR0,0 signaling;
(pressing 1-phase carries out when the left end node device, there is not pointing-type because receive the K2 byte, so still carry out by 1-phase) when detecting signal 2 deteriorations (SD), and the priority of SD bridge joint request that calculates signal 2 is the highest, then finishing bridge joint switches, so send SD2,2 (request opposite end bridge joint signals 2);
The right-hand member node device is (because be old equipment, can not judge the decision-making mode of K2 indication, but handle by normal 3-phase, the K1K2 that receives is SD2,2, expression left end request right-hand member bridge joint signal 2, simultaneously left end has been finished the signal Bridge 2 and has been connect, and the local terminal bridge joint that just can finish signal 2 has been switched so) the bridge joint Request Priority of confirmation signal 2 is the highest, and also finish the bridge joint of signal 2 and switch, send RR2,2.
Lost efficacy (SF) when the right-hand member node device detects signal 3, and the priority of the SF bridge joint request of signal calculated 3 is the highest, then switching of cancel message 2 sends SF3,2;
The bridge joint of left end node device cancel message 2 is switched, and the bridge joint of finishing signal 3 switches, and sends RR3,3;
The right-hand member node device is finished the bridge joint of signal 3 and is switched, and sends SF3,3;
The back process is handled similar.
Equipment of the present invention can be well and the existing equipment compatibility, do not have the problem of butt joint.And whole process deteriorates at most to shake hands for twice and just finishes bridge joint and switch, so also bring influence to switching efficient.
The 3-phase side refers to not adopt node of the present invention to carry out by acquiescence 3-phase mode, and the 1-phase side refers to adopt node of the present invention to carry out by the 1-phase mode
As shown in Figure 5, when request was initiated by the 3-phase side, whole process deteriorated to 2-phase (mutual twice protocol byte between two nodes) and carries out, and if request is initiated by the 1-phase side, be still by the 1-phase execution.If B presses 3-phase and carries out, receive NR when at last, rather than during RR, can cause B point possibly can't finish to switch (the NR request originally only be used to indicate current no request, request signal be numbered 0 or extra traffic number).
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to finish by program, described program can be stored in the computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize.Correspondingly, each module in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Below only be the preferred embodiments of the present invention; certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. method that realizes that multiplex section bidirectional linear protection is switched comprises:
After node device calculates the highest bridge joint request of protection in-group priority, carry out the corresponding professional bridge joint of this bridge joint request and switch according to first decision-making mode.
2. the method for claim 1 is characterized in that: described node device carries out the corresponding professional bridge joint of this bridge joint request according to first decision-making mode and the step of switching comprises:
Described node device is first decision-making mode as if what judge the configuration of this node device, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
3. the method for claim 1 is characterized in that: described node device carries out the corresponding professional bridge joint of this bridge joint request according to first decision-making mode and the step of switching comprises:
What the MSOH K2 that described node device receives as if judgement indicated is first decision-making mode, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
4. method as claimed in claim 3 is characterized in that:
The MSOH K2 indication that described node device if judge receives be after the step of first decision-making mode, also comprise: preserve described first decision-making mode;
Described according to first decision-making mode carry out the corresponding professional bridge joint of this bridge joint request and the step of switching after, also comprise: the MSOH K2 that sends described first decision-making mode of indication.
5. as each described method of claim 1-4, it is characterized in that: described according to first decision-making mode carry out the corresponding professional bridge joint of this bridge joint request and the process of switching in, also comprise:
Described node device is if receive the control information of switching that webmaster issues, and judges that described to switch the decision-making mode that control information carries different with the decision-making mode of current execution, then reports the decision-making mode information that do not match to described webmaster.
6. a node device comprises at least one working port and a protection port, and described working port and described protection port and APS (APS) module are mutual, it is characterized in that:
Described APS module, be used to calculate the highest bridge joint request of protection in-group priority after, carry out the corresponding professional bridge joint of this bridge joint request and switch according to first decision-making mode.
7. node device as claimed in claim 6 is characterized in that:
Described APS module, specifically being used for as if what judge the configuration of this node device is first decision-making mode, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
8. node device as claimed in claim 6 is characterized in that:
Described APS module, what the MSOH K2 byte that specifically is used for receiving as if judgement was indicated is first decision-making mode, then carries out the corresponding professional bridge joint of this bridge joint request and switches.
9. node device as claimed in claim 8 is characterized in that:
Described APS module also is used to preserve described first decision-making mode, also is used to send the MSOH K2 of described first decision-making mode of indication after finishing bridge joint and switching.
10. as each described node device of claim 6-9, it is characterized in that:
Described APS module also is used for if receive the control information of switching that webmaster issues, and judges that described to switch the decision-making mode that control information carries different with the decision-making mode of current execution, then reports the decision-making mode information that do not match to described webmaster.
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| CN201010294424.5A CN101951303B (en) | 2010-09-26 | 2010-09-26 | A kind of method and node device realizing bidirectional linear protection switch of multiplex section |
| PCT/CN2010/079521 WO2012037754A1 (en) | 2010-09-26 | 2010-12-07 | Method and node device for realizing bidirectional linear protection switching for multiplex section |
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| CN201010294424.5A CN101951303B (en) | 2010-09-26 | 2010-09-26 | A kind of method and node device realizing bidirectional linear protection switch of multiplex section |
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| CN102868441A (en) * | 2012-08-22 | 2013-01-09 | 中兴通讯股份有限公司 | Protection switching method and system and optical network node |
| CN102882590A (en) * | 2011-07-15 | 2013-01-16 | 中兴通讯股份有限公司 | Processing method, device and system after disappearance of fault on bidirectional working path |
| WO2013185656A1 (en) * | 2012-07-05 | 2013-12-19 | 中兴通讯股份有限公司 | Method for implementing cross-cable card msp, main control chip, and ptn device |
| CN104579950A (en) * | 2013-10-17 | 2015-04-29 | 韩国电子通信研究院 | Method and apparatus for linear protection switching |
| US9806939B2 (en) | 2013-10-17 | 2017-10-31 | Electronics And Telecommunications Research Institute | Method and apparatus for linear protection switching |
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| CN1617476A (en) * | 2003-11-12 | 2005-05-18 | 阿尔卡特公司 | Trail/path protection for SDH/SONET networks |
| CN101001123A (en) * | 2006-12-31 | 2007-07-18 | 华为技术有限公司 | Inversion method and device for optical transmission |
| CN101702658A (en) * | 2009-11-24 | 2010-05-05 | 中兴通讯股份有限公司 | Implement method of ring network protection and system thereof |
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| CN102882590A (en) * | 2011-07-15 | 2013-01-16 | 中兴通讯股份有限公司 | Processing method, device and system after disappearance of fault on bidirectional working path |
| WO2013185656A1 (en) * | 2012-07-05 | 2013-12-19 | 中兴通讯股份有限公司 | Method for implementing cross-cable card msp, main control chip, and ptn device |
| CN102868441A (en) * | 2012-08-22 | 2013-01-09 | 中兴通讯股份有限公司 | Protection switching method and system and optical network node |
| CN102868441B (en) * | 2012-08-22 | 2017-03-22 | 中兴通讯股份有限公司 | Protection switching method and system and optical network node |
| CN104579950A (en) * | 2013-10-17 | 2015-04-29 | 韩国电子通信研究院 | Method and apparatus for linear protection switching |
| US9806939B2 (en) | 2013-10-17 | 2017-10-31 | Electronics And Telecommunications Research Institute | Method and apparatus for linear protection switching |
Also Published As
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| WO2012037754A1 (en) | 2012-03-29 |
| CN101951303B (en) | 2016-03-30 |
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