CN101001123A - Inversion method and device for optical transmission - Google Patents
Inversion method and device for optical transmission Download PDFInfo
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- CN101001123A CN101001123A CN 200610063877 CN200610063877A CN101001123A CN 101001123 A CN101001123 A CN 101001123A CN 200610063877 CN200610063877 CN 200610063877 CN 200610063877 A CN200610063877 A CN 200610063877A CN 101001123 A CN101001123 A CN 101001123A
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Abstract
This invention provides an inversion method used in light transmission network, in which, the network includes ends A and B with a protection channel and a working channel in between, when the protection channel from B to A is invalid and B asks for ptrotection, the method includes the following steps: B sends K bite information containing bridge request via the working channel from B to A, end A receives the bite information to appoint the protection channel and the working channel between them to carry the service at the same time, end A sends the bridged information via the protection from it to B, end B selects services from the protection channel to finish the inversion based on the bridged information. This invention also provides an inversion device.
Description
Technical field
The present invention relates to network communication field, more specifically, relate to the reverse method and the device that are used for optical transport network.
Background technology
At SONET (Synchronous Optical Network, Synchronous Optical Network) in, if LOS is (Loss Of Signal, dropout), LOF (Loss Of Frame, LOF), AIS-L (Line AIS, Line Alarm Indication Signal), BER (Bit Error Ratio, bit error rate) out-of-limit (as, the SONET regulation surpasses 0.001), then will produce SF (SignalFailure, Signal Fail).
In SONET, RDI-L (Line Remote Defect Indication, the indication of circuit remote bug) is used to refer to the opposite end and detects AIS-L, and detected LOS and LOF will generate AIS-L.
SDH (Synchronous Digital Hierarchy; SDH (Synchronous Digital Hierarchy))/sonet path protection comprises linear protection and protection rings; they all transmit protection information by the K byte; the K byte should be in the protection channel transfer; wherein; the protection passage is exactly when switching, and is allocated for the passage of transmission regular traffic.When not switching, the protection passage can be used to carry extra traffic, and when switching, the business on the affected service aisle is bridged to the protection passage and sends, and service aisle is exactly when not switching generation, the passage of transmission regular traffic.Switch the action that is meant from protection passage rather than service aisle choosing receipts regular traffic.So-called bridge joint is meant and is working and protecting passage to transmit the action of regular traffic simultaneously.The protection passage that protection rings is meant whole ring is shared the protection rings so whole ring is otherwise known as by the regular traffic on each work section.
Linear protection is divided into two kinds of architecture modes of 1+1 and 1: N, and in the 1+1 framework, Working service forever is bridged to work and protection passage.According to Switch mode can be refined as again that 1+1 is single-ended, 1+1 both-end, 1: N is single-ended, 1: the N both-end.
The bridge joint of linear protection, to switch control law as follows:
(1) in the 1+1 framework, Working service forever is bridged to work and protection passage.
(2) 1: in the single-ended framework of n, the business of receiver side K1 byte indication is bridged to the protection passage.
(3) 1: in the n both-end framework, the control of bridge joint is accomplished by the channel number that relatively receives and send K1 byte indication, if receive and transmitter side K1 byte is indicated identical service aisle number, corresponding service then is bridged to the protection passage.
(4) single-ended operation of 1+1 framework, selector is by this locality request control of limit priority.
(5) 1+1 framework both-end operation, the control of selector is accomplished by relatively receiving K2 and sending the indicated channel number of K1 byte, if the two coupling, then loaded service is received from the choosing of protection passage on the passage of its indication.
(6) 1: in the n framework; finish the control of selector by the channel number that relatively receives K2 byte and the indication of transmission K1 byte; if the identical service aisle of receiver side K2 byte and transmitter side K1 byte indication number is then received this service aisle loaded service from the choosing of protection passage.
Linear protection K byte meaning is as follows:
| K1 is high 4 | Low 4 of K1 | K2 is high 4 | The 5th of K2 | Low 3 of K2 |
| Request type | Request bridged appearances number | Bridged appearances number | 0, the 1+1 framework; 1,1: the n framework | 4: single-ended mode 5: both-end pattern 6:MS_RDI 7:MS_AIS |
Wherein, request type comprises: protection locking, Forced Switch, Signal Fail, Signal Degrade, Manual Switch, Exercise Switching etc.The protection locking will be refused all working business (and extra traffic, use protection passage if any).Forced Switch will get rid of identical or higher priority is outside switches order and come into force or protect on the section and exist under the condition of SF situation, with the professional Forced Switch of assigned work to the protection passage.Manual Switch will get rid of on other passages exist lost efficacy, degradation (comprising the protection passage) or have identical or higher priority to switch under the situation that order comes into force, with the assigned work switching services to the protection passage.When Exercise Switching does not use at the protection passage, issue this and order the response of checking APS (Auto ProtectionSwitching, APS) byte, but do not carry out actual switching action.
Protection rings is divided into two fine protection rings and four fine protection rings again.
Protection rings K byte meaning is as follows:
| K1 is high 4 | Low 4 of K1 | K2 is high 4 | The 5th of K2 | Low 3 of K2 |
| Request type | Destination node | Source node | 0: minor axis 1: major diameter | 0: idle 1: bridge joint 2: bridge joint switches 3: extra traffic is 6:MS_RDI 7:MS_AIS on the protection passage |
Wherein, request type comprises: protection locking, section Forced Switch, ring Forced Switch, the inefficacy of protection channel signal, Signal Fail span switching, Signal Fail ring switching, protection channel signal deterioration, Signal Degrade span switching, Signal Degrade ring switching, artificial span switching, artificial ring switching, section Exercise Switching, ring Exercise Switching etc.Section is the set of the multiplex section between the adjacent node on the finger ring.Ring switching is applicable to two fibres and 4F Ring, and when initial ring was switched, the regular traffic that transmits on the inefficacy section direction was switched to the protection channel transfer on the reverse major diameter.Span switching is only applicable to 4F Ring, when the service aisle inefficacy only appears in certain section on the ring, makes regular traffic be carried by the protection passage of same section by span switching.
If there has been ring switching on the ring, the inefficacy that equal priority appears in another section of while also needs ring switching (to comprise SF-R (Signal Fail-Ring, the Signal Fail ring switching) and FS-R (Forced Switched Normal Traffic to Protection-Ring, the pressure ring switching) combination), so, if the priority of bridge joint request is SF-R or higher, then two ring switchings all will be carried out.
Ring should be able to protect the business that might protect, even have under a plurality of equal priority bridge joint request situation of (comprising SF-R and FS-R combination) no exception.
For 4F Ring, the following combination on the same section all can cause SF-R following situation to occur:
A) working line on the same sector and protection circuit lost efficacy;
B) working line on the same sector and protection circuit deterioration;
C) working line deterioration on the same sector and protection circuit lost efficacy.
If the node of carrying out the ring bridge joint and switching no longer receives the request of effective ring bridge joint on major diameter, this node should finish its ring bridge joint and switch.
The request of minor axis K byte bridge joint is unique foundation that span switching should start or stop, and the request of major diameter bridge joint is unique foundation that ring switching starts or stops.Minor axis is meant initiates bridge joint request section.Major diameter is meant the passage of forming by away from other section on the ring of initiating bridge joint request section.
When the node of just carrying out span switching received at the higher relatively major diameter ring bridge joint request of non-contiguous sectors and priority, this node should abandon span switching.
Reversed process in the multiplex section protection (for example SONET framework) of prior art is described below with reference to the accompanying drawings.
(1) linear 1+1 reversed process
Fig. 1 is the schematic diagram of the linear 1+1 reversed process of prior art.As shown in Figure 1, for the single-ended protected mode of linear 1+1, selector need not the byte by K by this locality request control, and for heterodoxy work described in the figure and the disconnected fine situation of protection, the B end is received professional according to this locality request (being service aisle SF) from the choosing of protection passage;
For 1+1 both-end mode,, should not protect service aisle because end protection passage lost efficacy.
(2) linear 1: N unidirectional switching process
Fig. 2 is the linearity 1 of prior art: the schematic diagram of N unidirectional switching process.Unidirectional switching is meant for unidirectional inefficacy to have only affected directional switching to switch framework to the protection of protection passage.Dual-ended switching be meant for unidirectional inefficacy two-way (comprising affected direction and not affected direction) all be switched to the protection passage protection switch framework.
As shown in Figure 2, B end detects SF, and it is as follows to switch the process of foundation:
A) B end is gone up to the A node at protection passage (prior art regulation K byte should transmitted on the protection passage) and is sent loaded service on K byte requests A bridge joint 1 passage, sends promptly that low four of K1 is " 0001 " in the K byte;
B) the A end bridge joint request of receiving the B end on the protection passage is bridged to the protection passage with 1 passage, and sends the K byte to B indicate 1 channel service bridge joint on the protection passage, sends promptly that high four of K2 is " 0001 " in the K byte;
C) the B end 1 channel service bridge information (high four of the K2 that promptly receives the K byte is " 0001 ") of receiving the A end from the protection passage will be received professionally from the choosing of protection passage, and unidirectional switching is finished.
(3) two fine ring switching processes
Fig. 3 is the schematic diagram of two fine ring switching processes of prior art.In two fine rings as shown in Figure 3, #1＜--two optical fiber of-#2 section all detect SF, on ring, do not have under the situation of other switching request, the SF-R ring switching is initiated in #1 and #2 (detected SF) request of all can asking according to this locality, and can on major diameter, receive the other side's request, and set up according to the major diameter switching request and to switch;
And when the ring switching of other coexistences is arranged on the ring (SF-R, FS-R), though #1 and #2 can not receive the other side's switching request on long and short footpath, still can keep the SF-R ring switching according to the coexistence ring switching request on this locality request (detected SF) and the major diameter.
(4) 4F Ring reversed process
Fig. 4 is the schematic diagram of the 4F Ring reversed process of prior art.As shown in Figure 4; T1 moment # 2 detects service aisle inefficacy (SF-S (Signal Fail-Span on the 4F Ring; the Signal Fail span switching)); be engraved in #3 east orientation pressure ring switching (FS-R) order up and down during T2; T3 # 1 constantly detects protection channel failure (SF-P (Signal Fail-Protection; the protection channel signal lost efficacy)), according to prior art, status change is as follows on the ring:
A) the T1 moment, #1＜---#2 section is set up the SF-S span switching, and promptly #1 and #2 are the span switching attitude, and #3 and #4 are K byte break-through attitude;
B) T2 constantly, #3＜--the FS-R ring switching of-#4 section is seized the SF-S span switching, and promptly #1 and #2 are full break-through attitude, and #3 and #4 are the ring switching attitude, wherein, full break-through is meant a kind of action that the K1, K2 byte and the protection channel signal former state that receive are sent;
C) T3 constantly; #1 is according to (the Multiplex Section-Remote Defect Indication of the MS-RDI in the K byte on detected SF-P of local terminal and the service aisle; the indication of multiplex section remote bug) (among the SDH MS-RDI; and among the SONET equity notion be RDI-L) indicating gage calculate #1＜--the request of-#2 span switching should be SF-R; this ring switching request (SF-R) and FS-R coexistence; so #1 sends out SF-R K byte requests on the line of apsides; the SF-R switching request that #2 receives on the passage according to the detected SF-S of local terminal and protection calculate #1＜--the request of-#2 span switching should be SF-R; this ring switching request (SF-R) and FS-R coexistence are SF-R and two ring switching coexistences of FS-R so T3 encircles the state of going up constantly.
Yet; for the single-ended protection framework of above-mentioned linearity 1: N; as shown in Figure 5; Fig. 5 is the linearity 1 of prior art: another schematic diagram of N unidirectional switching process; the inventor finds following problem in the invention process: when A holds the debit to the protection channel failure; B end service aisle also lost efficacy A--〉B service aisle loaded service, should transmit by protecting passage in the same way.But according to " 1: in the single-ended framework of n; the service aisle loaded service of receiver side K1 byte indication is bridged to the protection passage " this rule; then can't set up and switch; because A end debit is to the protection channel failure; can't obtain B end switching request (being the K byte); can't know " service aisle of K1 byte indication " certainly, thereby cause A--the B service disconnection.
In like manner, be switched to when protecting passage if the B end has the outside to switch order request, if A end debit, also can't obtain B end switching request to the protection channel failure and can not finish the bridge joint action, finally the B end can not be set up and switch.Wherein, the outside is switched order and is comprised orders such as protection locking, Forced Switch, Manual Switch, Exercise Switching.
In addition, for above-mentioned 4F Ring shape, as shown in Figure 6, Fig. 6 switches another schematic diagram of engineering for the 4F Ring of prior art, the inventor also finds following problem in the invention process: at T3 constantly, can be by means of the MS-RDI that indicates in the service aisle K byte, #1 finally calculates FS-R and the coexistence of SF-R ring switching, yet, by means of MS-RDI certain uncertainty is arranged, in SONET, with MS-RDI equity notion be RDI-L, and SF and RDI-L do not have one-to-one relationship among the SONET, the generation condition of SF comprises LOS, LOF, AIS-L, BER out-of-limit (stipulating among the SONET), and has only LOS, LOF, AIS-L can produce RDI-L, can not produce RDI-L and BER is out-of-limit.
If the detected SF of T1 moment # 2 is that BER OVER causes among Fig. 6; then #1 can not detect RDI-L on the east orientation service aisle; so constantly at T3; #1 can not receive the minor axis request of #2 because of east orientation protection channel failure; the west is to receiving the FS-R major diameter K byte requests of not pointing to self; self detects SF-P; under this input combination; #1 will enter SF-P span switching attitude; and can not enter the SF-R ring switching; cause FS-R and SF-R not coexistence on ring, can not protect all business as much as possible, do not meet the suggestion specification.As seen, prior art relies on RDI to have unreliability, has certain defective, and the hidden danger that causes professional unnecessary interruption is arranged.
Generally speaking, linear 1: in single-ended protection of N and the four fine protection rings, if protect channel failure, then can't know the switching request of opposite end, this will cause can not correctly setting up in some cases switching.
Therefore, people need a kind of solution of improving the multiplex section protection function, can solve above-mentioned the problems of the prior art.
Summary of the invention
The embodiment of the invention aims to provide a kind of reverse method and device that is used for optical transport network; can solve the linearity 1 of prior art: can not correctly set up problem such as switch in single-ended protection of N and the four fine protection rings in some cases, to improve the multiplex section protection function.
An aspect according to the embodiment of the invention, a kind of reverse method that is used for optical transport network is provided, wherein, optical transport network comprises side a and b, establish protection passage and service aisle each other, lost efficacy when B holds the protection passage (that is, A end debit is to the protection passage) to the A end, and B holds when claimed, and this method may further comprise the steps: the B end sends the K byte information that comprises the bridge joint request by its service aisle to the A end; After the A termination is received the K byte information, specify A to hold protection passage and the service aisle while bearer service of holding to B according to the bridge joint request; The A end sends bridge information by its protection passage to the B end (that is, A end originating party is to the protection passage); The B end is according to after the bridge information that receives, and is professional from protection passage choosing receipts, switches to finish.
In above-mentioned reverse method, this method also comprises: when the B end was no longer claimed, the B end discharges to be switched, and the B end sends the K byte information that does not comprise the bridge joint request by its protection passage to the A end; The A end is removed and is specified A to hold to the protection passage bearer service of B end according to the K byte information that does not comprise the bridge joint request that receives.
In above-mentioned reverse method, the K byte comprises K1 byte and K2 byte, and wherein, low four of K1 is used for indication request bridged appearances number, and high four of K2 is used to indicate bridged appearances number.
In above-mentioned reverse method, this method specifically comprises: make up upright protection passage and service aisle according to the single-ended fender bracket of linearity 1: N between the side a and b of optical transport network; Wherein, B holds to the protection passage of A end and has Signal Fail, and A holds to the service aisle of B end and exists Signal Fail or Signal Degrade or B termination to receive that the outside switches order.
In above-mentioned reverse method, this method specifically comprises: set up protection passage and service aisle according to the 4F Ring framework between the side a and b of optical transport network; Wherein, B holds the protection passage of holding to A to have Signal Fail, and A holds the service aisle of holding to B to have Signal Fail or Signal Degrade, and the B end is in Signal Fail ring switching attitude.
According to a further aspect in the invention, a kind of changeover apparatus that is used for optical transport network is provided, wherein, optical transport network comprises side a and b, establish protection passage and service aisle each other, this device comprises: service aisle K byte sending module is used for holding to the protection channel failure of A end as B, and B holds when claimed, and instruction B end sends the K byte information that comprises the bridge joint request by its service aisle to the A end; Professional designated module, be used to instruct the A termination to receive the K byte information after, specify A to hold protection passage and service aisle while bearer service according to the bridge joint request to the B end; Responder module is used to instruct the A end to send bridge information by its protection passage to the B end; And switch module, and be used to instruct the B end according to after the bridge information that receives, professional from protection passage choosing receipts, switch to finish.
In above-mentioned changeover apparatus; also comprise: recover module; be used for instruction when the B end is no longer claimed; instruction B end discharges to be switched; the B end sends the K byte information that does not comprise the bridge joint request by its protection passage to the A end; and instruction A end is removed and is specified A to hold to the protection passage bearer service of B end according to the K byte information that does not comprise the bridge joint request that receives.
In above-mentioned changeover apparatus, the K byte comprises K1 byte and K2 byte, and wherein, low four of K1 is used for indication request bridged appearances number, and high four of K2 is used to indicate bridged appearances number.
In above-mentioned changeover apparatus, make up upright protection passage and service aisle according to the single-ended fender bracket of linearity 1: N between the side a and b.
In above-mentioned changeover apparatus, establish protection passage and service aisle according to the 4F Ring framework between the side a and b; Wherein, B holds the protection passage of holding to A to have Signal Fail, and A holds the service aisle of holding to B to have Signal Fail or Signal Degrade, and the B end is in Signal Fail ring switching attitude.
As seen from the above description; the embodiment of the invention utilizes service aisle to send out the K byte; improve the multiplex section protection function; thereby an end that has solved the protection channel failure can't effectively be known the problem of the switching request of opposite end; therefore, the beneficial effect that brings of the embodiment of the invention is the multiplex section protection that can improve following situation:
(1) linear 1: in the single-ended protection framework of N, one end has the service aisle switching request, opposite end protection channel failure, this situation can't be finished under prior art and switch, after adopting the present invention, as long as the service aisle of opposite end correspondence did not lose efficacy, just can finish and switch, thereby can realize service protection better;
(2) 4F Ring exists SF or SD with section one end service aisle; the opposite end has only the protection channel failure; under prior art; can (among the SDH MS-RDI by means of RDI; being RDI-L among the SONET) indication is set up and is kept and switches, because the unreliability of RDI has certain defective; can guarantee the ring switching coexistence better after adopting the present invention, accomplish to protect as much as possible the professional this point that might protect.
The further feature of the embodiment of the invention and beneficial effect will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted framework in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the linear 1+1 reversed process of prior art;
Fig. 2 is the linearity 1 of prior art: N unidirectional switching process;
Fig. 3 is two fine ring switching processes of prior art;
Fig. 4 is the 4F Ring reversed process of prior art;
Fig. 5 is the linearity 1 of prior art: another schematic diagram of N unidirectional switching process;
Fig. 6 switches another schematic diagram of engineering for the 4F Ring of prior art;
Fig. 7 is the linearity 1 of the embodiment of the invention: the schematic diagram of the single-ended protection of N;
Fig. 8 is the schematic diagram of the 4F Ring protection of the embodiment of the invention;
Fig. 9 is the linearity 1 of the embodiment of the invention: the process chart that the single-ended protection of N is switched;
Figure 10 is the linearity 1 of the embodiment of the invention: another process chart that the single-ended protection of N is switched;
Figure 11 is the process chart of four fine share protect ring switchings of the embodiment of the invention;
Figure 12 is the flow chart of the reverse method of the embodiment of the invention; And
Figure 13 is the block diagram of the changeover apparatus of the embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.At this, illustrative examples of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
In the description of background technology; to linear 1: the technological deficiency of N unidirectional switching process and 4F Ring reversed process is analyzed respectively; can not correctly set up in some cases as can be known by above analysis and to switch, the debit that has its source in can't effectively be known the switching request of opposite end to an end of protection channel failure.
At above-mentioned analysis, the embodiment of the invention provides the reverse method that is used for communication network, and this communication network comprises the side a and b that establishes protection passage and service aisle each other.
Embodiment one:
Figure 12 is the flow chart of the reverse method of the embodiment of the invention; wherein; optical transport network comprises side a and b; establish protection passage and service aisle each other; this moment, A end debit was to protecting passage (promptly; B holds the protection passage to A end) lost efficacy, and B holds when claimed, and this reverse method may further comprise the steps:
Step S1202, the B end sends the K byte information that comprises the bridge joint request by its service aisle to the A end;
Step S1204 after the A termination is received the K byte information, specifies A to hold protection passage and the service aisle while bearer service of holding to B according to the bridge joint request;
Step S1206, the A end sends bridge information by its protection passage to the B end (that is, A end originating party is to the protection passage);
Step S1208, B end are according to after the bridge information that receives, and be professional from protection passage choosing receipts, switches to finish.
In above-mentioned reverse method, also can may further comprise the steps: when the B end was no longer claimed, the B end discharges to be switched, and the B end sends the K byte information that does not comprise the bridge joint request by its protection passage to the A end; The A end is according to the K byte information that does not comprise the bridge joint request that receives, and removal specifies A to hold the protection passage bearer service of holding to B (that is, the B end discharges when switching, and K byte information on the passage of resuming work is no longer with the K byte of protecting passage to send out the same).
The K byte comprises K1 byte and K2 byte, and wherein, low four of K1 can be used for indication request bridged appearances number, and high four of K2 can be used for indicating bridged appearances number.
Can make up upright protection passage and service aisle according to the single-ended fender bracket of linearity 1: N between the side a and b.
Also can establish protection passage and service aisle according to the 4F Ring framework between the side a and b, service aisle exists SF or SD, and switching attitude is SF-R ring switching attitude.
Embodiment two:
Figure 13 is the block diagram of the changeover apparatus 1300 of the embodiment of the invention, and wherein, optical transport network comprises side a and b, establishes protection passage and service aisle each other, and this changeover apparatus 1300 comprises:
Service aisle K byte sending module 1302 is used for holding protection channel failure to A end as B, and B holds when claimed, and instruction B end sends the K byte information that comprises the bridge joint request by its service aisle to the A end;
Professional designated module 1304, be used to instruct the A termination to receive the K byte information after, specify A to hold protection passage and service aisle while bearer service according to the bridge joint request to the B end;
In above-mentioned changeover apparatus 1300; also can comprise: recover the module (not shown); be used for instruction when the B end is no longer claimed; instruction B end discharges to be switched; the B end sends the K byte information that does not comprise the bridge joint request by its protection passage to the A end; and instruction A end is removed and is specified A to hold to the protection passage bearer service of B end according to the K byte information that does not comprise the bridge joint request that receives.
The K byte comprises K1 byte and K2 byte, and wherein, low four of K1 can be used for indication request bridged appearances number, and high four of K2 can be used for indicating bridged appearances number.
Can make up upright protection passage and service aisle according to the single-ended fender bracket of linearity 1: N between the side a and b.
Also can establish protection passage and service aisle according to the 4F Ring framework between the side a and b, service aisle exists SF or SD, and switching attitude is SF-R ring switching attitude.
As seen from the above description, the embodiment of the invention utilizes service aisle to send out the K byte, improves the multiplex section protection function, thereby has solved the debit can't effectively be known problem from the switching request of opposite end a to end of protection channel failure.Below with reference to accompanying drawings and in conjunction with specific embodiments, the present invention is described to linear 1: the corrective measure of the single-ended protection of N, four fine protection rings multiplex section protections.
Embodiment three:
As shown in Figure 7, Fig. 7 is the schematic diagram of the single-ended protection of linear 1:N of the embodiment of the invention, for linear 1: the single-ended protected mode of N, in theory, the A end should be set up bridge joint, the B end is then received professional from the choosing of protection passage, but on the prior art basis, the bridge joint control of A end need be by the K byte, the service aisle loaded service indicated by receiver side K1 byte is bridged to the protection passage, because A end debit can not receive the K byte to the protection channel failure, so can not set up bridge joint, nature can not be protected one way traffic; In like manner, be switched to when protecting passage, can not set up and switch if the B end has the outside to switch order request.
The embodiment of the invention is done following improvement to problems of the prior art:
A end debit is to the protection channel failure, and B end (service aisle has the switching request end) sends and the same K byte of protection passage on request bridge joint service aisle, and request A end bridge joint promptly sends low four indication request bridged appearances of K1 number;
And A end the local terminal debit under protection channel failure situation, can be according to the K byte that receives on the service aisle (promptly hanging down four indicated request bridged appearances number) bridge joint assigned work passage loaded service according to the K1 that receives;
A sends to B end to the protection passage with local terminal bridge information by originating party again, and promptly high four of the K2 that is sent indicates bridged appearances number;
B end is received bridge information (promptly according to high four the indicated bridged appearances of K2 that receive number) from the protection passage, receives business from the choosing of protection passage, and unidirectional switching is finished;
When (promptly no longer receiving professional from the choosing of protection passage) switched in the release of B end, K byte information on the passage of resuming work was no longer with the K byte of protecting passage to send out the same.
Embodiment four:
Fig. 8 is the schematic diagram of the 4F Ring protection of the embodiment of the invention; in the 4F Ring as shown in Figure 8; suppose #1＜--before four SF of-#2 section do not have to occur; issued east orientation FS-R order at #3; then SF-1, SF-2, SF-3, SF-4 occur successively, and the state on the ring should be done following transition in theory:
When (1) having only SF-1, have only FS-R to switch on the ring, #1 and #2 are full break-through attitude;
When (2) SF-2 occurring again, the synthetic SF-R of heterodoxy SF-P, SF-S should coexist with FS-R, and #1 and #2 should set up SF-R and switched this moment;
(3) when SF-3 occurs, still be to keep SF-R and the coexistence of FS-R ring switching;
(4) when SF-4 occurs, #1 and #2 can both still be SF-R and FS-R coexistences according to the synthetic SF-R of this locality request.
But (do not consider RDI) on the prior art basis, the state on the ring but can not be by desirable situation transition:
When (1) having only SF-1, have only FS-R to switch on the ring, #1 and #2 are full break-through attitude, and #3 and #4 all set up FS-R and switch;
When (2) SF-2 occurring again, the #1 west is to receiving that major diameter does not point to the FS-R K byte requests of self, and east orientation is because the protection channel failure can not receive the K byte, and #1 sends SF-P K byte at the line of apsides, and #1 enters the span switching attitude;
And #2 can enter SF-R according to the SF-P K byte of receiving on the detected SF-1 in this locality and the minor axis protection passage and switches attitude, and calculate according to the FS-R major diameter K byte of not pointing to self that east orientation is received and should be the coexistence of SF-R and FS-R ring switching, so exist SF-R to switch the page on the #2, #2 sends out the SF-R switching request on the line of apsides;
#3, also calculates and should be FS-R and the coexistence of SF-R ring switching on the ring after receiving the SF-R major diameter K byte that #2 sends out in the west, and #3 also keeps the ring switching attitude, and keeps FS-R according to the SF-R major diameter K byte of not pointing to oneself and switch the page;
#4 is then owing to receiving that no longer FS-R major diameter K byte discharges FS-R and switches the page;
(3) when SF-3 occurs, state remains unchanged on the ring;
(4) when SF-4 occurs, #1 and #2 can both be according to the synthetic SF-R of this locality request, SF-R and FS-R coexistence on the ring.
With status change under the prior art and the contrast of status change ideally, we can find that the state of (2) and (3) two kinds of situations is incorrect under the prior art, is necessary prior art is improved.By analyzing as can be known, switch status mistake why under (2) and (3) two kinds of situations, its reason is that #1 causes mistake in computation entirely of information in the switching request that east orientation can not get #2, thus, the embodiment of the invention proposes following corrective measure:
When the highest switching request of #2 is SF-R, on service aisle, send and the same K byte of protection passage, promptly in the west to sending SF-R minor axis K byte;
#1 protects channel failure, service aisle not under the failure conditions at east orientation, can enter or keep SF-R ring switching attitude according to the minor axis K byte that receives on the service aisle;
Recovered normally when #2 detects service aisle, K byte information on the passage of initiatively resuming work is no longer with the K byte of protecting passage to send out the same.
Through above-mentioned improvement, in Fig. 8, when SF-2 occurring, it is SF-R and the coexistence of FS-R ring switching that #1 and #2 can both calculate, and when SF-3, SF-4 occurring, all will keep the ring switching coexistence on the ring, conforms to ideal state.
Comprehensive the above embodiments, the technical scheme that the embodiment of the invention provides can followingly be set forth:
One. linear 1: the single-ended protection of N
Applicable elements:
One end has the service aisle switching request, and the service aisle of opposite end correspondence did not lose efficacy, the debit to the protection channel failure.
Countermeasure:
There is service aisle switching request end on current request bridge joint service aisle, to send and the same K byte of protection passage;
The K byte requests that the debit receives on protection channel failure end can be according to service aisle is carried out bridge joint, and indicates bridged appearances number in the K2 byte that sends, and switches originating end and receives that this K byte just can be set up in view of the above and switch, thereby finish protection to business;
Service aisle switching request end is arranged when release is switched; recover on the corresponding service aisle K byte information (promptly; make that the K byte of sending out now is identical with the K byte that issues in common situation; thereby the K byte when reverting to common situation); no longer send same K byte (that is, no longer synchronous) with the protection passage with the protection passage.
The handling process that service aisle switching request end arranged as shown in Figure 9, Fig. 9 is the linearity 1 of the embodiment of the invention: the process chart that the single-ended protection of N is switched may further comprise the steps:
When existing service aisle that switching request is arranged,, then only send switching request at the protection passage according to prior art if opposite end protection passage did not lose efficacy;
If the opposite end debit to the protection channel failure, then not only sends switching request at the protection passage, on service aisle, also send same switching request;
When release is switched, recover this service aisle K byte information, no longer send with protect passage on the same K byte.
The debit to the handling process of protection channel failure end as shown in figure 10, Figure 10 is the linearity 1 of the embodiment of the invention: another process chart that the single-ended protection of N is switched may further comprise the steps:
Under the condition of protection channel failure, when receiving the K byte requests on the service aisle,, then respond this switching request the debit if high four of K1 is legal, effective switching request.
Two. four fine protection rings
Applicable elements:
Certain section one end service aisle exists SF or SD;
And do not lose efficacy to protection channel failure, service aisle with section opposite end debit.
Countermeasure:
Service aisle SF or SD end send and the same K byte of protection passage on request bridge joint service aisle;
The debit is to protection channel failure, the service aisle end that do not lose efficacy, at this section from service aisle reception K byte requests;
Service aisle SF or SD end are when service aisle recovers, and be no longer synchronous with the protection passage aspect transmission K byte, recovers original K byte information (promptly issue what K byte in common situation, then also send out what K byte now).
The handling process of service aisle SF or SD end as shown in figure 11, Figure 11 is the process chart of four fine share protect ring switchings of the embodiment of the invention, may further comprise the steps:
When service aisle has SF or SD,, then only send switching request at the protection passage according to prior art if opposite end protection passage did not lose efficacy; If the opposite end debit to the protection channel failure, then not only sends switching request at the protection passage, on service aisle, also send same switching request; When this service aisle signal recovers, recover this service aisle K byte information, no longer send with protect passage on the same K byte.
The debit is to the handling process and 1 of protection channel failure end: similar during N is single-ended, referring to Figure 10, step is described and is omitted.
As seen from the above description; the embodiment of the invention utilizes service aisle to send out the K byte; improve the multiplex section protection function; thereby solved the debit can't effectively be known problem from the switching request of opposite end a to end of protection channel failure; therefore, the beneficial effect that brings of the embodiment of the invention is the multiplex section protection that can improve following situation:
(1) linear 1: in the single-ended protection framework of N, one end has the service aisle switching request, the opposite end debit is to the protection channel failure, this situation can't be finished under prior art and switch, after adopting the embodiment of the invention, as long as the service aisle of opposite end correspondence did not lose efficacy, just can finish and switch, thereby can realize service protection better;
(2) 4F Ring exists SF or SD with section one end service aisle; the opposite end has only the debit to the protection channel failure; under prior art; can (among the SDH MS-RDI by means of RDI; being RDI-L among the SONET) indication is set up and is kept and switches, because the unreliability of RDI has certain defective; can guarantee the ring switching coexistence better after adopting the embodiment of the invention, accomplish to protect as much as possible the professional this point that might protect.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.Should be understood that the variation in these concrete enforcements is conspicuous for a person skilled in the art, do not break away from spiritual protection range of the present invention.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. reverse method that is used for optical transport network, wherein, described optical transport network comprises side a and b; establish protection passage and service aisle each other, when B holds to the protection channel failure of A end, and B holds when claimed; it is characterized in that, may further comprise the steps:
The B end sends the K byte information that comprises the bridge joint request by its service aisle to the A end;
After the A termination is received described K byte information, specify A to hold protection passage and the service aisle while bearer service of holding to B according to described bridge joint request;
The A end sends bridge information by its protection passage to the B end;
The B end is according to after the described bridge information that receives, and is professional from protection passage choosing receipts, switches to finish.
2. reverse method according to claim 1 is characterized in that, this method also comprises:
When the B end was no longer claimed, the B end discharged described switching, and the B end sends the K byte information that does not comprise the bridge joint request by its protection passage to the A end;
The A end is removed and is specified A to hold to the protection passage bearer service of B end according to the described K byte information that does not comprise the bridge joint request that receives.
3. reverse method according to claim 1 is characterized in that, described K byte comprises K1 byte and K2 byte, and wherein, low four of K1 is used for indication request bridged appearances number, and high four of K2 is used to indicate bridged appearances number.
4. according to each described reverse method in the claim 1 to 3, it is characterized in that this method specifically comprises: make up upright protection passage and service aisle according to the single-ended fender bracket of linearity 1: N between the side a and b of described optical transport network; Wherein, B holds to the protection passage of A end and has Signal Fail, and A holds to the service aisle of B end and exists Signal Fail or Signal Degrade or B termination to receive that the outside switches order.
5. according to each described reverse method in the claim 1 to 3, it is characterized in that this method specifically comprises: set up protection passage and service aisle according to the 4F Ring framework between the side a and b of described optical transport network; Wherein, B holds the protection passage of holding to A to have Signal Fail, and A holds the service aisle of holding to B to have Signal Fail or Signal Degrade, and the B end is in Signal Fail ring switching attitude.
6. changeover apparatus that is used for optical transport network, wherein, described optical transport network comprises side a and b, establishes protection passage and service aisle each other, it is characterized in that, comprising:
Service aisle K byte sending module is used for holding protection channel failure to A end as B, and B holds when claimed, and instruction B end sends the K byte information that comprises the bridge joint request by its service aisle to the A end;
Professional designated module, be used to instruct the A termination to receive described K byte information after, specify A to hold protection passage and service aisle while bearer service according to described bridge joint request to the B end;
Responder module is used to instruct the A end to send bridge information by its protection passage to the B end; And
Switch module, be used to instruct the B end according to after the described bridge information that receives, professional from protection passage choosing receipts, switch to finish.
7. changeover apparatus according to claim 6 is characterized in that, also comprises:
Recover module; be used for instruction when the B end is no longer claimed; instruction B end discharges described switching; the B end sends the K byte information that does not comprise the bridge joint request by its protection passage to the A end; and instruction A end is removed and is specified A to hold to the protection passage bearer service of B end according to the described K byte information that does not comprise the bridge joint request that receives.
8. changeover apparatus according to claim 6 is characterized in that, described K byte comprises K1 byte and K2 byte, and wherein, low four of K1 is used for indication request bridged appearances number, and high four of K2 is used to indicate bridged appearances number.
9. according to each described changeover apparatus in the claim 6 to 8, it is characterized in that, make up upright protection passage and service aisle according to the single-ended fender bracket of linearity 1: N between the side a and b.
10. according to each described changeover apparatus in the claim 6 to 8, it is characterized in that, establish protection passage and service aisle according to the 4F Ring framework between the side a and b; Wherein, B holds the protection passage of holding to A to have Signal Fail, and A holds the service aisle of holding to B to have Signal Fail or Signal Degrade, and the B end is in Signal Fail ring switching attitude.
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| CN2006100638770A CN101001123B (en) | 2006-12-31 | 2006-12-31 | Inversion method and device for optical transmission |
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| CN2006100638770A CN101001123B (en) | 2006-12-31 | 2006-12-31 | Inversion method and device for optical transmission |
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