CN1874201B - Method and equipment for triggering protection of optical network under shared configuration of receiving devices - Google Patents
Method and equipment for triggering protection of optical network under shared configuration of receiving devices Download PDFInfo
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- CN1874201B CN1874201B CN200610089335A CN200610089335A CN1874201B CN 1874201 B CN1874201 B CN 1874201B CN 200610089335 A CN200610089335 A CN 200610089335A CN 200610089335 A CN200610089335 A CN 200610089335A CN 1874201 B CN1874201 B CN 1874201B
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- service aisle
- protection passage
- described service
- protection
- switch controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
Abstract
The method includes steps: selecting single board to connect working channel or protected channel to equipment of receiving service; based on detected results from light check point in working channel, light check point in protected channel, and check point of service signal of the receiving equipment, automatic protecting rearrangement controller determines whether fault in working channel and protected channel occurs. Moreover, the controller controls the selected single board to carry out switching according to following modes: if working channel is good, then switch is retained at the working channel; if working channel is in fault, and protected channel is good, then switch is retained at the protected channel; if both of working channel and protected channel are in fault, then switchis retained at working channel. The invention can determine restoring signals caused by rearrangement, and caused by restored working channel effectively so as to avoid error operation of system.
Description
Technical field
The present invention relates to the optical communication field, particularly relate to the realization technology that the Optical Transmission Network OTN protection of adopting wave division multiplexing WDM (WavelengthDivision Multiplexing) technology is switched.
Background technology
In the application that optical transport network protection is at present switched, have two kinds of system configuration modes for the receiving equipment of protected service signal: receiving equipment redundant configuration and receiving equipment are shared configuration, respectively as depicted in figs. 1 and 2.For receiving equipment redundant configuration mode shown in Figure 1; on active channel and protection path, respectively dispose a service signal receiving equipment 101; can detect the service signal quality condition on its place path; be respectively the triggering signal that APS (Automatic Protection Switching, the APS) controller 102 (be used for realizing APS protocol algorithm processing capacity) of system provides protection to switch and recover.Share configuration mode for receiving equipment shown in Figure 2; service signal from active channel and protection path at first arrives receiving equipment 101 after overprotection final controlling element (the protection selector switch 103 in the corresponding diagram) carries out the signal selection; be that active channel and protection path are shared the same receiving equipment of use; be used to detect the service signal quality condition on the current path, protect the triggering signal of switching and recovering for system's APS controller provides.For the applicable cases of Fig. 1,, can not exist protection to switch the associated treatment problem that triggers criterion because active channel and protection path have separately independently input ability.But the configuration for the shared receiving equipment of Fig. 2 is used, after the system works path fault is switched in a flash, service reception equipment can detect signal in detection and recover, but does not answer the protection of triggering system to recover (turning back to active channel) operation; After service signal was switched to the protection path, receiving equipment can only detect the signal(l)ing condition of protection path, and system will be difficult to effectively to realize the guard mode recovery operation of active channel after normal.
Summary of the invention
Technical problem to be solved by this invention provides a kind of optical network protection triggering method and device under the shared configuration of receiving equipment; the solution prior art can not effectively be differentiated restoring signal and the active channel of switching initiation and be repaired the restoring signal that is caused, and can not avoid the technical problem of the faulty operation of system.
For achieving the above object, the invention provides a kind of optical network protection triggering method under the shared configuration of receiving equipment, its characteristics are, select veneer that service aisle or protection passage are connected to service reception equipment, Automatic Protection Switching Control is according to service aisle light test point, the testing result of the service signal test point of protection passage light test point and described receiving equipment, judge whether described service aisle and protection passage break down, and control described selection veneer and abide by following mode and switch: mode one, if described service aisle is good, then switching remains on described service aisle; Mode two, if described service aisle fault, described protection passage is good, then switches to remain on described protection passage; Mode three, if described service aisle fault, described protection channel failure, then switching remains on described service aisle.
Above-mentioned method; its characteristics are; utilize the warning information of described service aisle light test point and described protection passage light test point to determine the transformation of the good or malfunction of described service aisle and described protection passage, and utilize the warning information of described service signal test point and alarm disappearance information that described state change is further confirmed with alarm disappearance information.
Above-mentioned method, its characteristics are that good at described service aisle, switching remains under the initial condition of described service aisle, and described mode two further comprises the steps:
Step a1 if described service signal test point detects signal fault, illustrates that then described service aisle breaks down, and described receiving equipment sends to described switch controller and switches triggering message;
Step b1, described switch controller send command message and come the execute protection switching operation to described selection veneer, connect described receiving equipment by described protection passage, and to start a time length simultaneously be the timer of T;
Step c1 in the time T of timer, if described switch controller receives the alarm disappearance message that described service reception equipment reports, illustrates that then described protection passage is good, the connection that keeps described protection passage.
Above-mentioned method; its characteristics are; good at described service aisle; switch and remain under the initial condition of described service aisle; described mode three is for further to comprise in described step c1: in the time T of timer, if described switch controller does not receive the alarm disappearance message that described service reception equipment reports, illustrate that then fault has also taken place described protection passage; then carry out recovery operation, keep the connection of described service aisle again.
Above-mentioned method; its characteristics are; all break down at described service aisle and described protection passage; switch and remain under the initial condition of described service aisle; described mode one comprises: if described switch controller receives the detected alarm disappearance of signal of described service signal test point; the state that described service aisle then is described changes into well, continues to keep the connection of described service aisle.
Above-mentioned method, its characteristics are, all break down at described service aisle and described protection passage, switch to remain under the initial condition of described service aisle, and described mode two comprises:
Step a2, do not receive at described switch controller under the prerequisite of the detected alarm disappearance of signal of described service signal test point, if described switch controller receives the alarm disappearance message that described protection passage light test point reports, illustrate that then the state of described protection passage changes into well;
Step b2, described switch controller send command message and come the execute protection switching operation to described selection veneer, connect described receiving equipment by described protection passage, and to start a time length simultaneously be the timer of T;
Step c2 in the time T of timer, if described switch controller receives the alarm disappearance message that described service reception equipment reports, illustrates that then described protection passage is good, the connection that keeps described protection passage.
Above-mentioned method; its characteristics are; all break down at described service aisle and described protection passage; switch and remain under the initial condition of described service aisle; described mode three is for further to comprise in described step c2: in the time T of timer, if described switch controller does not receive the alarm disappearance message that described service reception equipment reports, described protection passage or fault are described then; then carry out recovery operation, keep the connection of described service aisle again.
Above-mentioned method; its characteristics are; in described service aisle fault; described protection passage is good; switch and remain under the initial condition of described protection passage; described mode three comprises: if described switch controller receives the alarm generation message that described protection passage light test point reports, then described switch controller sends command message and switches recovery operation to described selection veneer execution, returns to the connection of described service aisle.
Above-mentioned method, its characteristics are that in described service aisle fault, described protection passage is good, switch to remain under the initial condition of described protection passage, and described mode one comprises:
Step a3, not receiving the detected alarm of described service signal test point at described switch controller produces under the prerequisite of message, if described switch controller receives the alarm disappearance message that described service aisle light test point reports, illustrate that then the state of described service aisle changes into well;
Step b3, described switch controller send command message and come the execute protection recovery operation to described selection veneer, connect described receiving equipment by described service aisle, and to start a time length simultaneously be the timer of T;
Step c3 in the time T of timer, if described switch controller receives the alarm disappearance message that described service reception equipment reports, confirms that then described service aisle is good, keeps the connection of described service aisle.
Above-mentioned method; its characteristics are; in described service aisle fault; described protection passage is good; switch and remain under the initial condition of described protection passage; described mode two is for further to comprise in described step c3: in the time T of timer; if described switch controller does not receive the alarm disappearance message that described service reception equipment reports; then described service aisle is fault still; described switch controller is controlled described selection veneer and is carried out switching operation, the connection that is switched to described protection passage and keeps described protection passage.
Above-mentioned method, its characteristics are that the length of described time T is carried out more than or equal to described selection veneer and switched required maximum time and the required maximum time sum of described receiving equipment detection affirmation alarm disappearance.
In order to realize that better purpose of the present invention, the present invention also provide a kind of optical network protection trigger equipment under the shared configuration of receiving equipment, its characteristics are, comprise and select veneer, service reception equipment and Automatic Protection Switching Control; Described selection veneer is connected to described receiving equipment with service aisle or protection passage; Described switch controller is used for: according to the testing result of the service signal test point of service aisle light test point, protection passage light test point and described receiving equipment, judge whether described service aisle and protection passage break down, and control described selection veneer and abide by following mode and switch:, then switch and remain on described service aisle if described service aisle is good; If described service aisle fault, described protection passage is good, then switches to remain on described protection passage; If described service aisle fault, described protection channel failure, then switching remains on described service aisle.
Technique effect of the present invention is: the present invention is directed to the situation that receiving equipment is shared configuration, can effectively differentiate restoring signal and the active channel of switching initiation and be repaired the restoring signal that is caused, avoid the faulty operation of system.
Description of drawings
Fig. 1 is the schematic diagram of receiving equipment redundant configuration;
Fig. 2 shares the schematic diagram of configuration for receiving equipment;
Fig. 3 is that shared receiving equipment protection provided by the invention triggers flow chart;
Fig. 4 is a 1+1 protection applicating example schematic diagram provided by the invention.
Embodiment
Below in conjunction with accompanying drawing and applicating example, concrete technology implementation scheme of the present invention is explained in detail.
The present invention is directed to the system protection of sharing under the receiving equipment configuration application scenarios and switch reliable triggering problem, proposed corresponding solution, Fig. 3 triggers flow chart for sharing the receiving equipment protection, as shown in the figure, mainly comprises following performing step:
1) at first need the trigger message of each test point that comprehensive share protect apparatus can provide, device shown in Figure 2 can provide following three test points: service signal test point, service aisle light test point, protection passage light test point.
2) when " service signal test point " when detecting signal fault, OTU sends APS by the Communication Control bus and triggers message to the APS controller, and the APS controller sends command message by the Communication Control bus and comes the execute protection switching operation to protection selector switch module; Starting a time length simultaneously is the timer of T, and the time span setting of T should be not less than " the protection selector switch is carried out and switched required maximum time T1 " and " OTU detects and confirms to alarm the maximum required time T2 that disappears " sum.
3) in timer picks up counting the time that timing finishes,, then protect selector switch to remain on the protection switch status if the APS controller receives the alarm disappearance message that service reception equipment reports; If do not receive the alarm disappearance message that service reception equipment reports, assert that then there is fault in the protection path, the APS controller sends command message by the Communication Control bus and carries out the operation that turns back to active channel to the protection selector switch.
If the optical switch state is service aisle state (this moment, the alarm status of corresponding service reception equipment was in alarm generation state) after step 3) always, then carry out according to following steps:
4) if during after this APS controller receives " service signal test point " detected alarm disappearance of signal, then the alarm of decidable active channel disappears, and protection selector switch state continues to maintain the service aisle state.Turn back to the treatment state of step 1).
5) after this do not receive under the prerequisite of " service signal test point " detected alarm disappearance of signal at the APS controller; after the APS controller receives the alarm disappearance message that " protection passage light test point " report; then selector switch execute protection switching operation is protected in the control of APS controller, starts the regulation of the timer that a time length is T (time span of T is provided with front step 2) simultaneously).In timer picks up counting the time that timing finishes, if the APS controller receives the alarm disappearance message that service reception equipment reports, then protect selector switch to keep the protection switch status, treatment step proceeds to step 6) then; If do not receive the alarm disappearance message that service reception equipment reports; assert that then still there is fault in the protection path; the APS controller sends command message by the Communication Control bus and carries out recovery operation to the protection selector switch, returns service aisle, and treatment step turns back to step 4).
If the optical switch state maintains protection channel status (this moment, the alarm status of corresponding service aisle was in alarm generation state) after step 3), then carry out according to following steps:
6) if the APS controller receives after alarm that " protection passage light test point " report produces message, the APS controller sends command message by the Communication Control bus and carries out to the protection selector switch and switch recovery operation, returns to service aisle.Treatment step forwards step 4) to.
7) do not receive the alarm that " protection passage light test point " report produces under the prerequisite of message at the APS controller, after if the APS controller receives the alarm disappearance message that " service aisle light test point " report, then the APS controller sends command message to the recovery operation of protection selector switch execute protection by the Communication Control bus, starting a time length simultaneously is the timer of T, the time span of T is provided with front step 2) regulation, in timer picks up counting the time that timing finishes, if the APS controller receives the alarm disappearance message that service reception equipment reports, then control protection selector switch keeps returning to form, and treatment step turns back to step 1); If do not receive the alarm disappearance message that service reception equipment reports, then still there is fault in the identification path, and APS controller control protection selector switch is carried out switching operation, is switched to the protection passage, and treatment step turns back to step 6).
As shown in Figure 4 be that the point-to-point 1+1 protected is used schematic diagram in the light conveying system; wherein source node with service signal be divided into two parts of whiles along service aisle and the protection passage transmit to destination node; select veneer (OP veneer) to receive respectively in destination node by light from the service signal of service aisle with the protection passage; the OP veneer itself provides the luminous power to service aisle and protection passage to detect; after the OP veneer, will select the service signal after receiving to be sent to the business reception veneer OTU that is connected; the OTU veneer can carry out the dropout (LOS) to service signal; LOF (LOF); the out-of-limit alarms such as (BER) of error code detects and reports APS controller veneer in real time, and APS control veneer is carried out veneer (OP veneer) according to the protection protocol algorithm to APS and sent the switch switching operation then.
When only 1. break down the position, OTU detects the LOS alarm and produces message, send message by control bus and control veneer to APS, APS control veneer control APS carries out veneer OP execute protection switching operation, start timer T=T1+T2=50ms+300ms=350ms simultaneously, wherein T1 carries out for the OP veneer and switches required maximum time, and T2 confirms the maximum required time of alarm disappearance for the OTU veneer detects; In T timing time scope; APS control veneer receives OTU and detects the signal recovery normal messages that reports; to control OP simultaneously and maintain the protection switch status. subsequent position is after 1. fault is repaired; OP service aisle light test point detects luminous power and recovers normal and report APS control veneer; APS control veneer is then controlled the OP veneer and is carried out the operation of returning service aisle; start timer T (T value 350ms) simultaneously; in T timing time scope; APS control veneer receives OTU and detects the signal recovery normal messages that reports, and controls OP subsequently and maintains the active channel state.
When 1. broke down the position, the OTU point detection signal detected signal fault and reports APS control single board signals to lose (LOS) alarm, and APS control veneer control OP veneer is carried out the operation that is switched to the protection passage.When 2. subsequent position broke down again, APS control veneer received after the protection passage luminous power alarm signal of OP, can control the OP veneer immediately and carry out recovery operation, and OP recovers at the service aisle state.Subsequent position is after 2. fault is repaired; OP protection passage light test point detects luminous power and recovers normal and report APS control veneer; APS control veneer is then controlled the OP veneer and is carried out the operation that is switched to the protection passage; start timer T (T value 350ms) simultaneously; in T timing time scope; APS control veneer receives OTU and detects the signal recovery normal messages that reports, and controls OP subsequently and maintains the protection channel status.
When only 2. broke down the position, it was " alarm produces " with protection channel alarm status indication that system APS control veneer only needs, and APS control veneer can not controlled the OP veneer and carry out any operation, and OP maintains the service aisle state.After 2. break down the position; it is " alarm produces " with protection channel alarm status indication that system APS control veneer only needs; when 1. subsequent position breaks down again; APS control veneer receives after the alarm signal of protection passage luminous power fault of OP; can control the OP veneer immediately and carry out recovery operation, the OP veneer recovers at the service aisle state.Subsequent position is after 2. fault is repaired; OP protection passage light test point detects luminous power and recovers normal and report APS control veneer; APS control veneer is then controlled the OP veneer and is carried out the operation that is switched to the protection passage; start timer T (T value 350ms) simultaneously; in T timing time scope; APS control veneer receives OTU and detects the signal recovery normal messages that reports, and controls OP subsequently and maintains the protection channel status.
The above is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Every according to equivalence variation and modification that the present invention did, all contained by claim of the present invention.
Claims (9)
1. share optical network protection triggering method under the configuration at receiving equipment for one kind; it is characterized in that; select veneer that service aisle or protection passage are connected to service reception equipment; Automatic Protection Switching Control is according to the testing result of the service signal test point of service aisle light test point, protection passage light test point and described receiving equipment; judge whether described service aisle and protection passage break down, and control described selection veneer and abide by following mode and switch:
Mode one, if described service aisle is good, then switching remains on described service aisle;
Mode two, if described service aisle fault, described protection passage is good, then switches to remain on described protection passage;
Mode three, if described service aisle fault, described protection channel failure, then switching remains on described service aisle;
Utilize the warning information of described service aisle light test point and described protection passage light test point to determine the transformation of the good or malfunction of described service aisle and described protection passage, and utilize the warning information of described service signal test point and alarm disappearance information that described state change is further confirmed with alarm disappearance information;
Good at described service aisle, switching remains under the initial condition of described service aisle, and described mode two further comprises the steps:
Step a1 if described service signal test point detects signal fault, illustrates that then described service aisle breaks down, and described receiving equipment sends to described switch controller and switches triggering message;
Step b1, described switch controller send command message and come the execute protection switching operation to described selection veneer, connect described receiving equipment by described protection passage, and to start a time length simultaneously be the timer of T;
Step c1 in the time T of timer, if described switch controller receives the alarm disappearance message that described service reception equipment reports, illustrates that then described protection passage is good, the connection that keeps described protection passage.
2. method according to claim 1; it is characterized in that; good at described service aisle; switch and remain under the initial condition of described service aisle; described mode three is for further to comprise in described step c1: in the time T of timer, if described switch controller does not receive the alarm disappearance message that described service reception equipment reports, illustrate that then fault has also taken place described protection passage; then carry out recovery operation, keep the connection of described service aisle again.
3. method according to claim 1; it is characterized in that; all break down at described service aisle and described protection passage; switch and remain under the initial condition of described service aisle; described mode one comprises: if described switch controller receives the detected alarm disappearance of signal of described service signal test point; the state that described service aisle then is described changes into well, continues to keep the connection of described service aisle.
4. method according to claim 3 is characterized in that, all breaks down at described service aisle and described protection passage, switches to remain under the initial condition of described service aisle, and described mode two comprises:
Step a2, do not receive at described switch controller under the prerequisite of the detected alarm disappearance of signal of described service signal test point, if described switch controller receives the alarm disappearance message that described protection passage light test point reports, illustrate that then the state of described protection passage changes into well;
Step b2, described switch controller send command message and come the execute protection switching operation to described selection veneer, connect described receiving equipment by described protection passage, and to start a time length simultaneously be the timer of T;
Step c2 in the time T of timer, if described switch controller receives the alarm disappearance message that described service reception equipment reports, illustrates that then described protection passage is good, the connection that keeps described protection passage.
5. method according to claim 4; it is characterized in that; all break down at described service aisle and described protection passage; switch and remain under the initial condition of described service aisle; described mode three is for further to comprise in described step c2: in the time T of timer, if described switch controller does not receive the alarm disappearance message that described service reception equipment reports, described protection passage or fault are described then; then carry out recovery operation, keep the connection of described service aisle again.
6. method according to claim 1; it is characterized in that; in described service aisle fault; described protection passage is good; switch and remain under the initial condition of described protection passage; described mode three comprises: if described switch controller receives the alarm generation message that described protection passage light test point reports, then described switch controller sends command message and switches recovery operation to described selection veneer execution, returns to the connection of described service aisle.
7. method according to claim 6 is characterized in that, in described service aisle fault, described protection passage is good, switches to remain under the initial condition of described protection passage, and described mode one comprises:
Step a3, not receiving the detected alarm of described service signal test point at described switch controller produces under the prerequisite of message, if described switch controller receives the alarm disappearance message that described service aisle light test point reports, illustrate that then the state of described service aisle changes into well;
Step b3, described switch controller send command message and come the execute protection recovery operation to described selection veneer, connect described receiving equipment by described service aisle, and to start a time length simultaneously be the timer of T;
Step c3 in the time T of timer, if described switch controller receives the alarm disappearance message that described service reception equipment reports, confirms that then described service aisle is good, keeps the connection of described service aisle.
8. method according to claim 7; it is characterized in that; in described service aisle fault; described protection passage is good; switch and remain under the initial condition of described protection passage; described mode two is for further to comprise in described step c3: in the time T of timer; if described switch controller does not receive the alarm disappearance message that described service reception equipment reports; then described service aisle is fault still; described switch controller is controlled described selection veneer and is carried out switching operation, the connection that is switched to described protection passage and keeps described protection passage.
9. according to any described method of claim in the claim 1,2,4,5,7 or 8, it is characterized in that the length of described time T is carried out more than or equal to described selection veneer and switched required maximum time and the required maximum time sum of described receiving equipment detection affirmation alarm disappearance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610089335A CN1874201B (en) | 2006-06-20 | 2006-06-20 | Method and equipment for triggering protection of optical network under shared configuration of receiving devices |
| PCT/CN2006/003785 WO2008000120A1 (en) | 2006-06-20 | 2006-12-30 | A method and device for triggering the optical network protection under the configuration of sharing the receiving apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610089335A CN1874201B (en) | 2006-06-20 | 2006-06-20 | Method and equipment for triggering protection of optical network under shared configuration of receiving devices |
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| CN1874201A CN1874201A (en) | 2006-12-06 |
| CN1874201B true CN1874201B (en) | 2010-05-12 |
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| WO (1) | WO2008000120A1 (en) |
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| CN101383635B (en) * | 2007-09-06 | 2013-04-17 | 华为技术有限公司 | Inter-plate channel protection method and device |
| CN101567800A (en) | 2008-04-22 | 2009-10-28 | 华为技术有限公司 | Method and system for protection switching decision and method and system for performance monitoring |
| CN101626272B (en) * | 2008-07-10 | 2013-03-20 | 中兴通讯股份有限公司 | Method for realizing error connection prevention in optical network |
| CN101790110B (en) * | 2009-01-22 | 2012-12-19 | 中兴通讯股份有限公司 | Device and method for coordinating and recovering automatic protection switching operation |
| CN101883295B (en) * | 2009-05-06 | 2014-04-30 | 华为技术有限公司 | Service transmission processing methods, node equipment and network system |
| CN101577845B (en) * | 2009-06-01 | 2012-11-14 | 中兴通讯股份有限公司 | Method and device for processing switching control command |
| CN101605282B (en) * | 2009-06-26 | 2012-07-04 | 中兴通讯股份有限公司 | System, method and device for protecting optical network |
| CN101848034B (en) * | 2010-05-05 | 2014-12-17 | 中兴通讯股份有限公司 | Optical path protecting device and method |
| CN101989927A (en) * | 2010-10-20 | 2011-03-23 | 华为技术有限公司 | Method, device and equipment for processing redundancy inversion |
| CN102664702B (en) * | 2012-04-05 | 2014-12-03 | 烽火通信科技股份有限公司 | Protection mode of cross disc of M to N |
| CN102761794B (en) * | 2012-07-09 | 2018-06-01 | 中兴通讯股份有限公司 | Photosphere passage 1+1 protection service establishing method and device |
| CN104025476B (en) * | 2012-12-04 | 2016-10-05 | 华为技术有限公司 | Optical transport network controls processing method and the protection device of pretection switch scope |
| CN103441793B (en) * | 2013-08-30 | 2017-01-25 | 上海斐讯数据通信技术有限公司 | Method for realizing reliable communication between optical links |
| CN106533543B (en) * | 2016-11-22 | 2023-11-10 | 中国南方电网有限责任公司 | Low-rate optical signal protection device and protection method |
| CN107479996B (en) * | 2017-07-11 | 2020-09-18 | 深圳市恒扬数据股份有限公司 | Light-off protection circuit of optical transmission equipment and light-off protection method thereof |
| CN115694617A (en) * | 2021-07-28 | 2023-02-03 | 中兴通讯股份有限公司 | Protection switching method and electronic equipment |
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| CN1874201A (en) | 2006-12-06 |
| WO2008000120A1 (en) | 2008-01-03 |
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