CN1713555A - Light channel shared protection control and its controller - Google Patents
Light channel shared protection control and its controller Download PDFInfo
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- CN1713555A CN1713555A CN 200410060103 CN200410060103A CN1713555A CN 1713555 A CN1713555 A CN 1713555A CN 200410060103 CN200410060103 CN 200410060103 CN 200410060103 A CN200410060103 A CN 200410060103A CN 1713555 A CN1713555 A CN 1713555A
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Abstract
The method includes following steps: on source /host nodes, checks if light signal in working channel at receiving side of sharing protection device in light channel is interrupted; when the light signal is interrupted, makes the spare channel at receiving side of sharing protection device in the light channel to receive light signal, and makes the light signal from transmitting side feed back to the spare channel, namely entering source/ host node as protection switching state; at the intermediate node in the service connection, when the light signals in the working channel and spare channel at receiving side of sharing protection device in the light channel are detected, makes the sharing protection device in the light channel continuously transmit the light signal sent by receiving spare channel through the spare channel at transmitting side, namely entering intermediate node protection switch state.
Description
Technical field
The present invention relates to wavelength division multiplexing (WDM) technology, relate in particular to light-channel shared protection control method and device in a kind of wavelength-division multiplex system.
Background technology
The progress of optical device has greatly promoted the development of optical communication technique.Especially the development of WDM technology, the message capacity that present simple optical fiber can carry is up to Tbps.In this case, bottom optical network optical fiber line fault or equipment fault often affect a large amount of business, improve the research focus that network survivability becomes operator and equipment supplier day by day.
Network survivability just is meant that network still can keep the ability of acceptable quality of service grade during standing network failure and equipment failure.The key technical indexes that characterizes the network survivability performance has: redundancy, recovery rate and recovery time.Redundancy is defined as in the network ratio of total idle capacity and total work capacity, and mainly being the measurement system can the required extra cost of paying for improving survivability; Recovery rate refer to fault a situation arises down, the ratio of the port number that has recovered and the overall channel number of original inefficacy, or the ratio of the capacity that has recovered and original total inefficacy capacity; Refer to that network is to recover the required consumed time of failure service recovery time.
Different business is different fully to the requirement of failure recovery time.Under the general situation, the ATM of large-scale financial institution and bank is the highest to requirement recovery time of business, generally requires less than 50ms; Common communication service is higher to the suffertibility of service outage duration, but generally also is no more than 30 minutes.These business are after process switch or router processing, transmit through optical-fiber network.Generally speaking, when transmission network break period was between 50～200ms, the connection losing probability of the reciprocal exchange of business did not have influence less than 5% substantially for No.7 nation-wide Network and cell relay service.When transmission network increased between 200ms～2s break period, reciprocal exchange of business losing probability began progressively to rise, surpass 2s after, most circuit switching connection, special line, dial business all will be lost.And when transmission network arrives 10s break period, all communication sessions all will be lost connection.And if surpass transmission network break period after 5 minutes, will cause longer time irrecoverable of the serious obstruction of switch and upper-layer service.
In the past in significant period of time; the defencive function that the SDH Self-healing Rings is powerful makes it become commonplace networking mode; the SDH looped network is supported BPSR; UPSR; ULSR; 2F-BLSR; 4F-BLSR and SNCP; to UPSR; ULSR; can also can realize protection when the line fault without control protocol to signal; but under alternate manner; all need agreement to participate in; with at originator node to pass-along message between all nodes between the receiving end node (comprising receiving end node and originator node); the assurance system can in time discern and work as prior fault; and, realize quick protective switch to judging rightly when prior fault and taking suitable measure.The quick protective switch control method of taking in the SDH looped network is exactly the K byte.K byte method is by constantly sending the K byte to destination by the source end; whether the K byte lost efficacy destination by detecting, whether whether current K byte status change to come decision network to break down and which type of fault has taken place; and take which type of recovery measure with the reply network failure according to K byte content decision, this mode is fit to the protection of SDH looped network and switches control very much.
Being surging forward of metropolitan area bulky grain high band wide data service application makes wdm system progressively by the transmission net of metropolitan area network employing as the bottom.Metro WDM is usually with the networking of looped network form, and protected modes such as UPSR, the BPSR that wdm system simulation SDH equipment provides, BLSR, ULSR, SNCP provide similar protected mode: OUPSR, OBPSR, OULSR, OBLSR, OSNCP, OCh-SPRing.Wherein light-channel shared protection ring (OCh-SPR) is widely used bandwidth good characteristic such as transparent grade because of wavelength utilization ratio height.
In WDM looped network OCh-SPR protected mode, generally inherited the K byte method that adopts on the SDH equipment and come network failure is carried out fast detecting, location, controls and switches.But it is different with SDH equipment transmission K byte mode, SDH equipment by synchronization frame with the road expense in the K byte of distributing finish Detection ﹠ Controling to passage, multiplex section fault, each fiber spans all can be carried out Regeneration Treatment to signal, and promptly whether two end nodes of each fiber spans can break down and what fault detects to this fiber spans is current.Limited by cost in the WDM equipment; the signal transmission is end to end; wavelength business about not in this locality is transparent fully for this node; this node can not carry out any processing to it; this is infeasible for the protected modes such as OCh-SPR that require intermediate node participation protective reversed process, means that also the method for taking with road expense carrying K byte can't continue to use in wdm system.WDM equipment provides extra monitoring and controlling channels (common usefulness 1310,1510,1625nm equiwavelength's light are as monitoring and controlling channels) for this reason; in order to expense, monitoring and the management byte of carrying WDM optical multiplexing section, so WDM equipment is switched functions such as control information by distribute the realization of K byte in monitoring and controlling channels to detection, differentiation and the transmission protection of network failure.
There is following shortcoming in above-mentioned prior art:
Mode by the extra monitoring and controlling channels of WDM carrying K byte can realize protection and the recovery to fault; but Cable's Fault often causes service signal and monitoring and controlling channels to lose efficacy simultaneously simultaneously; therefore have only monitoring and controlling channels to switch and to transmit the K byte more afterwards; this means that a circuit fault recovery is often followed switches for twice; the protection that at first is monitoring and controlling channels is switched; next is that service signal protection is switched; twice reversed process business switching time that extended greatly, in addition also longer than SDH protection switch time.
Secondly also there is Problem of Failure in the monitoring unit of WDM equipment, promptly do not have under the situation of fault at network, monitoring unit can be because hardware or software problem break down, and the K byte that causes on the monitoring and controlling channels being carried is shaken, and causes the generation of WDM equipment to switch misoperation.For the WDM equipment that is in the optical transfer network bottom, reliability requirement is higher, and misoperation is unacceptable substantially.Often to take complicated K byte filter type on the existing equipment, avoid misoperation.
Moreover, have many group wavelength on the wdm system to adopting the OCh-SPR protected mode, the K byte demand that this moment, requirement provided enough expenses to support different passages on monitoring and controlling channels, this has strengthened the realization difficulty on the one hand, and monitoring unit needs and can discern the K byte of different passages with main control unit; Also can further prolong protection switch time on the other hand; because a line fault often influences the business connection of a plurality of passages simultaneously; too much protection switching request can be impacted the switching request of a monitoring unit and a storm formula of main control unit generation; monitoring unit and main control unit are handled a plurality of requests and can be caused the processing time to increase, and have reduced protection and have switched response speed.
Summary of the invention
Light-channel shared protection control method of the present invention and device exist in the existing light-channel shared protection to solve that protection switch time is long, response speed slow and the problem of poor reliability.
For addressing the above problem, the invention provides following technical scheme:
A kind of light-channel shared protection control method, this method is:
Whether light signal interrupts in the service aisle of detection light-channel shared protection device receiver side on the sourcesink node that business connects, and when interrupting, light signal makes the backup path receiving optical signals of this channels share protective device from receiver side, and, promptly enter the sourcesink node and be the protection switch status the backup path of this side of light signal feed-in of transmitter side; And
When the backup path that detects the service aisle of light-channel shared protection device receiver side and this side on the described professional intermediate node that connects all has light signal; the backup path that the light signal that this light-channel shared protection device is sent the receiver side backup path passes through transmitter side continues to transmit, and promptly enters intermediate node protection switch status.
Work switch unit in a kind of light-channel shared protection device, this work switch unit comprises:
The receiver side service aisle is used to transmit this underground service signal;
The receiver side backup path is used to back up the service signal of receiver side service aisle;
Receiver side backup path processing module is used to handle the service signal of receiver side backup path;
First switch is connected with receiver side backup path processing module with the receiver side service aisle, and receives this underground service signal according to system command from receiver side service aisle or receiver side backup path;
The transmitter side backup path is used for service signal on the backup local or transmits the service signal of receiver side backup path;
The transmitter side processing module is used to handle this ground service signal;
Second switch is connected with receiver side backup path processing module with the processing module of transmitter side, and sends out from the transmitter side backup path according to the service signal of system command with this ground service signal or receiver side backup path;
Detection module detects the light signal of receiver side service aisle and receiver side backup path, and controls first switch and second switch carries out the share protect switching operation according to testing result.
According to above-mentioned work switch unit:
Described second switch is 1 * 2 optical switch of 3 states, and described transmitter side processing module is for being divided into one road light signal splitter of two ways of optical signals.
Described second switch is 1 * 2 optical switch of 2 states, and described receiver side backup path processing module is 1 * 2 optical switch, and described transmitter side processing module is for being divided into one road light signal splitter of two ways of optical signals.
Described second switch is 1 * 2 optical switch of 2 states, and described transmitter side processing module is 1 * 2 optical switch.
Described second switch and receiver side backup path processing module are 2 * 2 optical switches of one 3 state, described transmitter side processing module is for being divided into one road light signal splitter of two ways of optical signals, and 2 * 2 optical switches of described 3 states are connected with first switch, receiver side backup path, transmitter side backup path and transmitter side processing module respectively.
Described second switch and receiver side backup path processing module are 2 * 2 optical switches or 2 * 2 disconnected optical switches of band complete shut-down of one 2 state, and described transmitter side processing module is 1 * 2 optical switch; This 2 * 2 optical switch is connected with first switch, receiver side backup path, transmitter side backup path and transmitter side processing module respectively.
The present invention has following beneficial effect:
1, do not have monitoring and controlling channels to participate in reversed process, it is simpler, more reliable that control is switched in protection;
2, do not have monitoring and controlling channels to participate in reversed process, can avoid switching services to carry out monitoring and controlling channels earlier before and switch, only need a protection switch time, reduced protection switch time thereby once protect to switch;
3, do not have monitoring and controlling channels to participate in, therefore need not main control unit and participate in switching action, all light-channel shared protections are finished by the light-channel shared protection device fully, and it can significantly reduce the single node processing time according to self detected signal deciding action;
4, because do not use K byte control mode, therefore do not exist the protection that causes because of the inefficacy of K byte to switch misoperation, increase the reliability that protection is switched.
Description of drawings
Fig. 1 is that light-channel shared protection unit state of the present invention switches schematic diagram;
Fig. 2 A, 2B are that light-channel shared protection is switched flow chart;
Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7 are the structural representation with light-channel shared protection device of a work switch unit;
Fig. 8, Fig. 9 are the structural representation with light-channel shared protection device of two work switch units;
The structural representation that Figure 10 uses in the node of wdm system for duplex channel share protect changeover apparatus of the present invention.
Embodiment
Light-channel shared protection; can be described as having used simultaneously with a pair of wavelength X 1 and λ 2 in the different two-way services connections that on different sections, exist on the ring; wavelength X 1 and λ 2 respectively interior fibre and outside on the fibre; meanwhile, interior fibre and the fine outward λ 2 of correspondence and the protection wavelength that λ 1 is used as outer fibre and interior fine operation wavelength λ 2 and λ 1 respectively gone up.Because it all is to use interior fine and outer fine λ 2 and λ 1 wavelength to conduct protection wavelength simultaneously that the different two-way services of the different sections of striding connect, therefore this protected mode is referred to as light-channel shared protection (OCh-SPRing).
For the node that participates in light-channel shared protection, it must support three functions: on professional break-through, the business and under professional.Professional break-through is meant that the protection business of other website can be in the direct break-through of this website, to guarantee correctly to be sent to its destination node; Refer on the business after local business is affected, can correctly be switched on the backup path and transmits; Professional next finger destination for local business after service aisle is subjected to fault effects, can be sent to this locality by backup path, and can the business of backup path correctly be incorporated into receiver in this locality.
Node for the participation light-channel shared protection on the ring; except above-mentioned three kinds of functions are provided; also need the ability that can discern three kinds of states, these three kinds of states are: the intermediate node state when the sourcesink node state when normal operating conditions, fault, fault.Have only and discerned after three kinds of states, could allow the protective device of this node determine to send and receive Working service, still send and receive Working service, even provide the break-through connection for the business of other section of striding by backup path from service aisle.
Transmitting information by control channel is a kind of method commonly used with the state that allows node on the route stand-by discern this node.Under traditional light-channel shared protection mode, after one time line fault takes place, can trigger destination node and produce a protection switching request, this destination node sends the APS request by the K byte along the protection path.Node is by judging the APS request mark on the way, with the destination of discerning this request this node whether, if this node, represent that this node is connected with business between the destination node that something unexpected happened, it will carry out source node action, be about to this node and be connected with business between the destination node and be switched on the route stand-by; If not this node, represent that this node hereat hinders the intermediate node of the route stand-by of connection, so it must carry out intermediate node action, the backup path that is between source node and the destination node provides the break-through function.
The present invention proposes a kind of without monitoring and controlling channels transmission protection switch messages, but by the light-channel shared protection device of each node by detecting the mode of backup path and service aisle state, reach the purpose that detects oneself state.Its principle is as shown in Figure 1:
Certain wavelength of each node is to the light-channel shared protection device of the correspondence light signal (can be luminous power, also can be that carrier wave is transferred top signal identification) by testing passage and backup path, to reach the purpose of judging oneself state.When just powering on, the protection switch function of light-channel shared protection device is in not enabled state, has only operate as normal just the share protect switch function can be entered enabled state after a period of time, causes protection to switch misoperation in the time of can avoiding the initial stage to power on like this.After to enter enabled state be normal operating conditions among Fig. 1; the light-channel shared protection device begins the situation of backup path and service aisle is intercepted; service aisle has light under the normal condition, backup path is unglazed; when service aisle and backup path state did not change, the light-channel shared protection device kept normal operating conditions.When the unexpected no signal of service aisle; protective device can judge that service aisle breaks down; and self node is affected sourcesink node; sourcesink Node Protection when protect changeover apparatus to carry out fault immediately this moment is switched work; the signal that is about to transmitter side sends by backup path, simultaneously receiver side and backup path is joined.When service aisle has signal; and signal also appears suddenly in backup path; can judge that local business connection is not affected this moment; but the connection of the business of other node is broken down; work is switched in the intermediate node protection of protection changeover apparatus can start fault the time, is about to the information that backup path sends and continues to transmit down along backup path.Whole light-channel shared protection is switched flow process shown in Fig. 2 A.Whether whether the professional node that connects be the sourcesink node except there is light signal to discern this node by the testing passage, also can judge by other modes.
When a lightguide cable link fault takes place; what learn this message at first is the affected professional corresponding receiver side that connects; promptly should business connect corresponding destination node receiving end service aisle no signal; this moment, it can be judged certainly immediately as the sourcesink node; except that being switched to receiver side on the backup path, it also changes the corresponding professional optical signals feed-in service aisle that connects transmitter side of this node into the backup path on the feed-in protection route.Protect this moment the next node on the route will detect backup path signal is arranged; if this node self does not have professional the connection to be affected; be that decidable self is not the sourcesink node; but intermediate node; this wavelength is promptly finished break-through to the light-channel shared protection device of correspondence; the light signal that backup path is sent passes this node, continues to transmit to next node along backup path.When sourcesink node in front changes the optical signals feed-in service aisle of transmitter side on the feed-in protection route backup path; the sourcesink node receiver side of opposite end also can detect light signal and lose; this moment, it also can carry out same action, finished reciprocal protection and switched work.Therefore this protected mode after service aisle recovers normally, does not recover normal function automatically because the signal of transmitter side no longer transmits on service aisle, need the dependence mode of manually issuing orders could recover normal operating conditions.
In order to increase auto restore facility, the sourcesink node of faulty section must be all the time to service aisle FD feed light.But if so; certain direction during then two-way services connect connects when being affected; whether affected two-way connection transmitting terminal exists by sensed light signal can't be judged certainly as the sourcesink node; because its receiver side light signal is normal; just backup path also has information; it will carry out the break-through function of intermediate node, not reach the purpose that protection is switched.For this reason, the sourcesink node need increase sourcesink node identification detection method (as transferring the top technology), guarantees the correct status recognition of each node.
Consult shown in Fig. 2 B; after increasing the id information RM; recover normal as service aisle; the sourcesink node can detect service aisle light; this moment, the light-channel shared protection device of sourcesink node can recover normally, and this sourcesink node transmitter side can stop feed-in light signal in the backup path of protection route.Simultaneously, protection route intermediate node on the way will can not detect light signal again on backup path, can correspondingly enter normal operating conditions yet, therefore finish and recover action.
In order to distinguish the difference of two kinds of guard methods, the unidirectional transmission of transmitter side is considered as method 1, the two-way transmission of transmitter side is considered as method 2.The difference of method 2 and method 1 is that method 2 can realize recovering automatically after the fault restoration function of normal operating conditions, and method 1 can only manually be recovered; Whether 1 need of next method detection signal exists gets final product, and method 2 need need to judge whether the destination node of backup path signal conforms to local node when whether detection signal exists.
Consult the light-channel shared protection device of a kind of implementation method 2 shown in Figure 3, the work switch unit of this device comprises:
Receiver side service aisle (hereinafter to be referred as western W) is used to transmit this underground service signal.
Receiver side backup path (hereinafter to be referred as eastern P) is used to back up the service signal of receiver side service aisle.
Receiver side backup path processing module, the light signal of processing receiver side backup path.This module is the 3dB splitter among the figure, and according to the control needs, this processing module also can be selector switch or optical switch.
First switch is connected with the receiver side backup path with the receiver side service aisle, and receives this underground service signal according to system command from receiver side service aisle or receiver side backup path.
Transmitter side backup path (to be called for short western P) is used for service signal on the backup local or transmits the service signal of receiver side backup path.
The transmitter side processing module is used to handle this ground service signal.This module is the 3dB splitter among the figure, and according to the control needs, this processing module also can be an optical switch etc.
Second switch is connected with the receiver side backup path with the processing module of transmitter side, and sends out from the transmitter side backup path according to the service signal of system command with this ground service signal or receiver side backup path.
Detection module detects the light signal of receiver side service aisle and receiver side backup path, and controls first switch and second switch carries out the share protect switching operation according to testing result.
Because there are three kinds of states to need identification, therefore need two independently test points at least, by detection module an independent detection point is set on receiver side service aisle and receiver side backup path respectively, after the combination of two test point testing results four kinds of states are arranged, two test point testing results and node state corresponding relation are as shown in the table:
Because said apparatus has been taked method 2, therefore also need increase node detection.Promptly when the service aisle of the signal of transmitter side feed-in simultaneously transmitter side and backup path, need to detect three variablees: whether whether receiver side backup path signal exists, whether receiver side service aisle signal exists and the destination node of receiver side backup path signal sign (ID) identical with this node ID (just can detect its destination node ID when backup path has only signal).Two test point testing results and signal ID testing result and node state corresponding relation are as shown in the table:
| Signal is arranged | The ID difference | Intermediate node state during fault | Destination node state during fault |
| ID is identical | Source node state during fault | ||
| No signal | Normal operating conditions | ||
Because of normal operating conditions requires receiver side backup path no signal and receiver side service aisle signal is arranged.Between the P of backup path west, need a three-dB coupler and second switch (one 1 * 2 optical switch) at east orientation backup path east P and west among Fig. 3, if 1 * 2 optical switch can only be finished routing function, then because backup path is unglazed under normal operation, therefore this 1 * 2 optical switch can only couple together western P and eastern P, will cause backup path Cheng Huan this moment, and then form the looped network self-excitation.Second switch does not adopt 1 * 2 optical switch that has only two condition among the present invention for this reason, and adopting 1 * 2 optical switch of 3 states, i.e. 2 routings and 1 turn-off function are when normal operating conditions, this 1 * 2 optical switch is in off state, and promptly western P also the get along well eastern W passage of eastern P of both having got along well connects.But after the W service aisle of playing the host broke down, this 1 * 2 optical switch can couple together eastern W and western P passage, can arrive the destination by route stand-by to guarantee business.Come signal and local western W business and uninfluenced in eastern P backup path, and when detecting eastern P service signal destination and being not this node, this 1 * 2 optical switch couples together eastern P and western P, pass this node with the business that guarantees eastern P backup path, continue to transmit the arrival destination to next node along western P backup path; Interrupted or when detecting eastern P service signal destination and being this node, second switch will be in off state as western W business, and first switch will couple together eastern P and following business, finishes destination node and protects switching action.
Second switch among Fig. 3 also can realize with 1 * 2 optical switch of 2 states, but this moment eastern P or the 3dB splitter of eastern W need adopt 1 * 2 optical switch to substitute, as Fig. 4, shown in Figure 5.
Fig. 4 and Fig. 5 be corresponding method 2 and method 1 respectively.Three kinds of states of the second switch among Fig. 4 are finished in second switch among second switch among Fig. 4 and the 3rd switch, Fig. 5 and the 4th switch combination.When operate as normal, the second switch of Fig. 4 is selected the 3rd switch ways, and the 3rd switch is connected eastern P with first switch, can guarantee western P no signal this moment, because all nodes not westwards P send information, P does not have information yet to the east of the institute, has only service aisle that the purpose of signal, backup path no signal is arranged when promptly having reached operate as normal.When the W service aisle of playing the host broke down, second switch can couple together eastern W and western P passage, can arrive the destination by route stand-by to guarantee business.Come signal and local western W business and uninfluenced in eastern P backup path, and when detecting eastern P service signal destination and being not this node, second switch will be connected with the 3rd switch, the 3rd switch is selected eastern P is connected with second switch simultaneously, be about to eastern P and western P couples together, the business that has guaranteed eastern P backup path is passed this node, continues to transmit the arrival destination to next node along western P backup path; Interrupted or when detecting eastern P backup path signal destination and being this node as western W business; second switch continues to select the 3rd switch; but the 3rd switch is selected to be connected with first switch, and first switch will couple together eastern P and following business, finishes destination node protection switching action.Fig. 5 and Fig. 4 are similar substantially, and different is second switch is when normal operating conditions, and second switch is selected to be connected with the 4th switch, but the selection of the 4th switch will go up business and be connected with eastern W, have guaranteed western P backup path no signal, and the connection under other state is so analogized.Even the 3dB splitter of last professional 3dB splitter among Fig. 4 and eastern P passage can also be used instead the realization of 1 * 2 optical switch, 3 status functions of easier realization Fig. 3 second switch at this moment.
As shown in Figure 6, can also adopt 2 * 2 optical switches of 3 states to substitute three-dB coupler and second switch (corresponding method 2) on the eastern P backup path.The three condition of second switch is respectively: shutoff, straight-through, interconnection.West P and eastern P, upward connection between the business during shutoff, but connect between first switch and the eastern P; West P is connected with eastern P when straight-through, and first switch is connected with last business; West P is connected with last business during interconnection, eastern P is connected with first switch.When operate as normal, second switch keeps off state, and this moment, western P was without any signal.When the W service aisle of playing the host broke down, second switch was in the interconnection state, and promptly western P backup path is connected with last business, and the business that can guarantee this moment is sent to the destination by western P backup path through the protection route.The P backup path of playing the host has light signal, and western W is professional and uninfluenced and when detecting eastern P service signal destination and being not this node, second switch will be in pass-through state, be that western P is connected with eastern P backup path, guarantee that this node of signal break-through that eastern P backup path sends continues to be sent to the destination along western P backup path; Interrupted or when detecting eastern P service signal destination and being this node as western W business; second switch will be in off state; second switch both disconnected the connection between western P and the last business; simultaneously again eastern P is connected to first switch; first switch couples together eastern P and following business again, finishes destination node protection switching action.
The off state of top second switch comes down to one and half off states, promptly only turn-offs the connection of western P backup path, and not being connected of eastern P backup path and first switch turn-offed, though existing optical switch can be realized but school complexity relatively.Therefore can use 2 * 2 switches or 2 * 2 disconnected optical switches of band complete shut-down of 2 states instead and finish, also will be one 1 * 2 i.e. the 3rd switch (corresponding method 1) of optical switch but go up the three-dB coupler of service channel this moment, as shown in Figure 7 instead.
Light-channel shared protection device among Fig. 7 is when operate as normal, and second switch can be an off state, also can be the interconnection state, but the 3rd switch must be that last business and eastern W passage are linked together, to guarantee western P passage no signal.The work of other state sees also the description of above-mentioned Fig. 4, Fig. 5.
Fig. 3～structure shown in Figure 7 can only be finished a unidirectional light-channel shared protection and connect.But more applications is that two-way services connect in the network; this moment, the light-channel shared protection device was to combine by any two in the device shown in Fig. 3～Fig. 7; they can be same apparatus; it also can be different device; but, require the light-channel shared protection device of wavelength 1 and wavelength 2 correspondences all to take method 1 or all take method 2 in order to guarantee the control method unanimity.
Fig. 8 provides also the example of the light-channel shared protection device after 2 combinations of an employing method, and first, second work switch unit in this device be the composition of structure shown in Fig. 5, and its groundwork process is as follows:
Suppose that W11 service aisle (receiver side service aisle) breaks down, D1 business (professional down) is influenced, after T11 (detection module) detects the W11 no signal, K11 (first switch) switches execution, finish being connected of D1 and K13 (the 3rd switch), K13 is under the connection status of P11 (receiver side backup path) and K11 at this moment; K22 (second switch) also carries out switching action simultaneously with it, finishes being connected of A1 (going up professional) and P21, and the A1 signal just transmits to next node by the P21 backup path of protection route.The P22 of next intermediate node will detect from the signal of a node P21 passage, this moment, its K23 coupled together P22 and K22, finish the connection (during the K22 normal condition P21 and K23 being linked together) between P22 and the P21 referring to Fig. 5 explanation; The K13 of this node also will carry out the action the same with K23 simultaneously, P11 and K12 are coupled together, and with being connected of realization P11 and P12, thus the break-through function of realization backup path.So analogize; up to opposite end sourcesink node; the sourcesink node is when P22 detects signal; the destination node that detects the backup path signal is consistent with this node ID; therefore carry out sourcesink protection switching action; K12 finishes being connected of A2 and P12 on the one hand, and K21 finishes being connected of D2 and K23 on the other hand, and this moment, whole light-channel shared protection process was finished.
After fault restoration, initiate to recover automatically the request of normal condition once more by the sourcesink node of initiating the protection switching request, and the sourcesink node of original passive execute protection switching request will be carried out the work that recovers normal condition according to the backup path situation.Operation is to avoid certain the unidirectional connection in the two-way connection to receive influence like this, and frequently switching appears when not being affected in the connection of another one direction.Because unidirectional fault is often arranged in the network; promptly a two-way connection business may have only a direction influenced; another direction is not influenced; though an affected side can switch by execute protection; and the unaffected sourcesink node in opposite end also can and then be carried out this protection switching action; but because its service aisle and uninfluenced; it still can receive business at the work receive path; if do not limited this moment; it will carry out the action that recovers normal operating conditions, and the result causes frequently protection to switch and recover.The device of realizing for employing method 1 is not because support to recover automatically the function of normal condition, therefore the situation that can not occur frequently switching.
Above-mentioned light-channel shared protection device can be an electric switch at the optical switch at following professional place, also can be that two receiving elements are finished choosing receipts function, and the 3dB optical coupler at last business place can be to finish two functions of sending out or publish by electric switch or two transmitting elements.When adopting 1+1 optical conversion element (OUT) or dual transmitting and receiving OTU, above-mentioned light-channel shared protection device is as shown in the empty frame among Fig. 9.
The application of light-channel shared protection device shown in Fig. 9 in wavelength division multiplexing (WDM) system be as shown in figure 10:
Two transmitting terminals of the first Optical Add Drop Multiplexer unit (OADM) respectively with the service aisle W11 of the first work switch unit receiver side and the backup path P12 of the second work switch unit receiver side.
Two receiving terminals of the second Optical Add Drop Multiplexer unit are connected with the service aisle W12 of the first work switch unit transmitter side and the backup path P21 of the second work switch unit receiver side respectively.
Two receiving terminals of the 3rd Optical Add Drop Multiplexer unit are connected with the service aisle W21 of the transmitter side of the second work switch unit and the backup path P12 of the first work switch unit transmitter side respectively.
Two transmitting terminals of the 4th Optical Add Drop Multiplexer unit are connected with the service aisle W22 of the second work switch unit receiver side and the backup path P11 of the first work switch unit receiver side respectively.
Four, the first Optical Add Drop Multiplexer unit goes out the service signal of service aisle and the service signal of backup path with this wavelength that the thing both direction comes to demultiplexing respectively, and is transferred among the corresponding OTU according to network condition; The service aisle that second, third Optical Add Drop Multiplexer unit is right with this wavelength on the thing both direction respectively and the service signal of backup path are multiplexed with one road signal and send out, thereby finish professional the connection.There is not the wavelength of professional contact for this locality, by first and second, direct-connected passage Express between the 3rd and the 4th OADM carries out punch-through process.
Claims (15)
1, a kind of light-channel shared protection control method is characterized in that this method is:
Whether light signal interrupts in the service aisle of detection light-channel shared protection device receiver side on the sourcesink node that business connects, and when interrupting, light signal makes the backup path receiving optical signals of this channels share protective device from receiver side, and, promptly enter the sourcesink node and be the protection switch status the backup path of this side of light signal feed-in of transmitter side; And
When the backup path that detects the service aisle of light-channel shared protection device receiver side and this side on the described professional intermediate node that connects all has light signal; the backup path that the light signal that this light-channel shared protection device is sent the receiver side backup path passes through transmitter side continues to transmit, and promptly enters intermediate node protection switch status.
2, the method for claim 1; it is characterized in that; light-channel shared protection device on the sourcesink node also with the service aisle of this side of light signal feed-in, and carries the destination node sign in light signal in this side backup path of light signal feed-in of transmitter side.
3, method as claimed in claim 2; it is characterized in that; when the light-channel shared protection device on the sourcesink node is detecting the service aisle of receiver side and backup path and all has destination node in light signal and this signal to be designated this node; automatically withdraw from the protection switch status and enter normal operating conditions, and stop backup path feed-in light signal to transmitter side.
4, method as claimed in claim 3 is characterized in that, when the light-channel shared protection device on the described intermediate node detects the light signal interruption of backup path, withdraws from intermediate node protection switch status automatically and enters normal operating conditions.
As the arbitrary described method of claim 1 to 4, it is characterized in that 5, whether the professional node that connects has light signal or other modes to judge whether this node is the sourcesink node by the service aisle that detects light-channel shared protection device receiver side.
6, the work switch unit in a kind of light-channel shared protection device is characterized in that this work switch unit comprises:
The receiver side service aisle is used to transmit this underground service signal;
The receiver side backup path is used to back up the service signal of receiver side service aisle;
Receiver side backup path processing module is used to handle the service signal of receiver side backup path;
First switch is connected with receiver side backup path processing module with the receiver side service aisle, and receives this underground service signal according to system command from receiver side service aisle or receiver side backup path;
The transmitter side backup path is used for service signal on the backup local or transmits the service signal of receiver side backup path;
The transmitter side processing module is used to handle this ground service signal;
Second switch is connected with receiver side backup path processing module with the processing module of transmitter side, and sends out from the transmitter side backup path according to the service signal of system command with this ground service signal or receiver side backup path;
Detection module detects the light signal of receiver side service aisle and receiver side backup path, and controls first switch and second switch carries out the share protect switching operation according to testing result.
7, device as claimed in claim 6 is characterized in that, described second switch is 1 * 2 optical switch of 3 states, and described transmitter side processing module is for being divided into one road light signal splitter of two ways of optical signals; According to the testing result of detection module, second optical switch disconnects the transmitter side backup path makes its no signal, and the transmitter side backup path is connected with the receiver side backup path, and the transmitter side backup path is connected with splitter.
8, device as claimed in claim 6, it is characterized in that, described second switch is 1 * 2 optical switch of 2 states, and described receiver side backup path processing module is 1 * 2 optical switch, and described transmitter side processing module is for being divided into one road light signal splitter of two ways of optical signals; Testing result according to detection module, second optical switch and receiver side backup path processing module cooperate disconnection transmitter side backup path to make its no light signal, the transmitter side backup path is connected with the receiver side backup path, and perhaps second switch makes the transmitter side backup path be connected with splitter.
9, device as claimed in claim 6 is characterized in that, described second switch is 1 * 2 optical switch of 2 states, and described transmitter side processing module is 1 * 2 optical switch; According to the testing result of detection module, second optical switch and transmitter side processing module cooperate disconnection transmitter side backup path to make its no signal, and the transmitter side backup path is connected with splitter; Perhaps second switch makes the transmitter side backup path be connected with the receiver side backup path.
10, device as claimed in claim 6, it is characterized in that, described second switch and receiver side backup path processing module are 2 * 2 optical switches of one 3 state, described transmitter side processing module is for being divided into one road light signal splitter of two ways of optical signals, and 2 * 2 optical switches of described 3 states are connected with first switch, receiver side backup path, transmitter side backup path and transmitter side processing module respectively; Testing result according to detection module, 2 * 2 optical switches of this 3 state disconnect the transmitter side backup path to be made its no light signal and the receiver side backup path is connected with first switch, the transmitter side backup path is connected with splitter and the receiver side backup path is connected with first switch; The transmitter side backup path is connected with the receiver side backup path.
11, device as claimed in claim 6 is characterized in that, described second switch and receiver side backup path processing module are 2 * 2 optical switches or 2 * 2 disconnected optical switches of band complete shut-down of one 2 state, and described transmitter side processing module is 1 * 2 optical switch; This 2 * 2 optical switch is connected with first switch, receiver side backup path, transmitter side backup path and transmitter side processing module respectively.
12, device as claimed in claim 6 is characterized in that, described receiver side backup path processing module is power splitter or selector switch.
13, want 6 to 12 described devices as claim, it is characterized in that, described first switch is an optical switch, perhaps is the electric switch in the wavelength conversion unit, perhaps is logic switch.
14, a kind of light-channel shared protection device comprises two work switch units; It is characterized in that described two work switch units are each described work switch unit in the claim 6 to 13, promptly the structure of this two work switch unit is identical; Perhaps described two work switch units are respectively described work switch unit in the claim 6 to 13, and promptly the structure of these two work switch units is inequality.
15, a kind of wavelength-division multiplex system, the transmission channel that comprises a plurality of nodes and connected node, it is characterized in that described node comprises first, second, third, fourth Optical Add Drop Multiplexer unit, and light-channel shared protection device as claimed in claim 13, this device has the first and second two work switch units;
Two transmitting terminals of the described first Optical Add Drop Multiplexer unit are connected with the service aisle of the first work switch unit receiver side of light-channel shared protection device and the backup path of the second work switch unit receiver side respectively;
Two receiving terminals of the described second Optical Add Drop Multiplexer unit are connected with the service aisle of the first work switch unit transmitter side and the backup path of the second work switch unit receiver side respectively;
Two receiving terminals of described the 3rd Optical Add Drop Multiplexer unit are connected with the service aisle of the transmitter side of the second work switch unit and the backup path of the first work switch unit transmitter side respectively;
Two transmitting terminals of described the 4th Optical Add Drop Multiplexer unit are connected with the backup path of the first work switch unit receiver side and the service aisle of the second work switch unit receiver side respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100601033A CN100508439C (en) | 2004-06-24 | 2004-06-24 | Light channel shared protection control and its controller |
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| CNB2004100601033A CN100508439C (en) | 2004-06-24 | 2004-06-24 | Light channel shared protection control and its controller |
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| CN1713555A true CN1713555A (en) | 2005-12-28 |
| CN100508439C CN100508439C (en) | 2009-07-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100578993C (en) * | 2006-09-14 | 2010-01-06 | 上海交通大学 | Method and device for protecting shared route of fault of double chain |
| CN101043271B (en) * | 2007-04-26 | 2010-11-10 | 华为技术有限公司 | Method, equipment and system for switching optical service signal protection |
| CN1859061B (en) * | 2006-01-24 | 2011-04-20 | 华为技术有限公司 | Method for improving optical layer protective reliability of wave division multiplex system |
| CN115549775A (en) * | 2022-12-05 | 2022-12-30 | 北京百度网讯科技有限公司 | Method for processing optical signal transmission abnormity, optical transmission equipment and system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1136688C (en) * | 2001-02-27 | 2004-01-28 | 北京邮电大学 | Node protector for changover ring of wave division multiplexing circuit |
| CN1281302C (en) * | 2003-05-28 | 2006-10-25 | 财团法人工业技术研究院 | Submicron-sized dispersed liquid preparing method |
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2004
- 2004-06-24 CN CNB2004100601033A patent/CN100508439C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1859061B (en) * | 2006-01-24 | 2011-04-20 | 华为技术有限公司 | Method for improving optical layer protective reliability of wave division multiplex system |
| CN100578993C (en) * | 2006-09-14 | 2010-01-06 | 上海交通大学 | Method and device for protecting shared route of fault of double chain |
| CN101043271B (en) * | 2007-04-26 | 2010-11-10 | 华为技术有限公司 | Method, equipment and system for switching optical service signal protection |
| CN115549775A (en) * | 2022-12-05 | 2022-12-30 | 北京百度网讯科技有限公司 | Method for processing optical signal transmission abnormity, optical transmission equipment and system |
| CN115549775B (en) * | 2022-12-05 | 2023-10-17 | 北京百度网讯科技有限公司 | Processing method for optical signal transmission abnormality, optical transmission equipment and system |
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| CN100508439C (en) | 2009-07-01 |
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