CN101471837B - Optical channel data cell sharing protection ring, signal transmission method and network node - Google Patents
Optical channel data cell sharing protection ring, signal transmission method and network node Download PDFInfo
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Abstract
The invention discloses an optical channel data unit shared protection ring (ODUk_SPRing), which comprises a first node for acquiring a pre-transmission signal before failure of a service channel between the first node and a second node and outputting the pre-transmission signal to a third node via a protection channel as well as bridging the user service of the first node to the protection channel after failure of the service channel between the first node and the second node and outputting to the third node; a third node for feeding through the protection channel and feeding the pre-transmission signal to the second node after receiving the pre-transmission signal and feeding the user service of the first node to the second node through the protection channel after failure of the service channel between the first node and the second node; and a second node for selectively receiving the user service of the first node on the protection channel after failure of the service channel between the first node and the second node. The technical scheme provided by the invention can quicken ring network protection switching speed.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of optical channel data cell sharing protection ring, method for transmitting signals and network node.
Background technology
Optical transfer network (Optical Transport Networks, OTN) framework comprises: optical transmission section (OpticalTransmission Section, OTS) layer, optical multiplexing section (Optical Multiplex Section, OMS) layer, optical channel (Optical Channel, OCh) layer, optical channel transmission unit (Optical ChannelTransport Unit, OTU) layer, optical channel data cell (Optical Channel Data Unit, ODU) layer, wherein, OTS, OMS, OCh belong to photosphere, and OTU, ODU belong to the electricity layer.
ODUk protection rings (ODUk Shared Protection Ring; ODUk_SPRing) be positioned at the ODU layer; its structure identifies 1,2,3,4 Working service as shown in Figure 1a among the figure, the sourcesink node of every Working service is client's business node of ODUk_SPRing up and down.The ODUk_SPRing protection is sourcesink type (STEERING) protection, and when nearside protection passage did not interrupt, professional 1 sourcesink node served as switching node, switches by the protection of P4 protection optical fiber realization nearside; When nearside protection passage interrupted, professional 1 sourcesink node served as switching node, switched by P3-P2-P1-P5 protection optical fiber realization distal protection.
Because the protection channels share characteristic of protection rings has determined on the pipe ring still a plurality of Working service are not arranged; the protection passage all can not take according to the protected mode of chain or other ring network; when not walking extra traffic; the not break-through of optical channel data cell sharing protection ring intermediate node; protection switch be triggered after, intermediate node will protect the time of passage break-through to need 2ms at least.ODUk_SPRing with OTN is that the example explanation protects each intermediate node on the passage to carry out the influence of break-through to protection switch time below.
Fig. 1 b shows 6 loops compositions of ODUk_SPRing; A, B node are client's business node up and down; when between A and B minor axis breaks fibre; A, B node are carried out sourcesink type (STEERING) action as switching node; C, D, E, F node are carried out break-through as the intermediate node of protection passage; because each intermediate node is carried out the minimum 2ms that needs of break-through, supposes that the APS agreement adopts 2 segmentation agreements, needs the break-through time to be for 6 rings: 2*4=8ms.If adopt 16 rings, the break-through time of intermediate node is so: 2*14=28ms, add transmission time of client's business optical fiber between node, and can increase the switching time of client's business.If adopt 32 rings, the break-through time of intermediate node is so: 2*30=60ms, and therefore, switching time surpasses 50ms, and 50ms is the switching time upper limit that prior art is stipulated under the situation of no extra traffic.
In research and practice process to prior art, the inventor finds that there is following problem in prior art:
In the prior art, protection is switched the back intermediate node that is triggered and is just carried out break-through, and the overlong time of intermediate node break-through, and switching time is increased, and can cause the transport service unnecessary loss when switching, and causes customer satisfaction to descend.
Summary of the invention
The technical problem that the embodiment of the invention will solve provides a kind of optical channel data cell sharing protection ring, method for transmitting signals and the network node that can accelerate looped network protection switching speed.
In view of this, the embodiment of the invention provides:
A kind of optical channel data cell sharing protection ring comprises: first node, Section Point and the 3rd node, wherein,
Described first node, before being used for the service aisle fault between first node and Section Point, obtain pre-transmission signals and export described the 3rd node to by the protection passage, after the service aisle fault between first node and Section Point, client's business of first node is bridged to the protection passage and transfers to the 3rd node;
Described the 3rd node, be used for after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through, after the service aisle fault between first node and Section Point, client's business of the described first node of break-through is to Section Point on the protection passage of break-through;
Described Section Point is used for after the service aisle fault between first node and Section Point, and client's business of the described first node on the protection passage is received in choosing.
A kind of optical channel data cell sharing protection ring comprises: first node, Section Point, the 3rd node, the 4th node and the 5th node, wherein,
Described first node, before being used for the service aisle fault between first node and Section Point, produce a NSI signal and export described the 3rd node to by the protection passage, after the service aisle fault between first node and Section Point, client's business of first node is bridged to the protection passage and transfers to the 3rd node;
Described the 3rd node, be used for after receiving a described NSI signal break-through of execute protection passage, the described NSI signal to the of break-through four intranodals termination, after the service aisle fault between first node and Section Point, client's business to the four nodes of the described first node of break-through;
Described the 4th node, before being used for the service aisle fault between first node and Section Point, client's business to the five nodes of transmission oneself on the protection passage, after the service aisle fault between first node and Section Point, the break-through of execute protection passage, client's business to the five nodes of the described first node of break-through;
Described the 5th node, before being used for the service aisle fault between first node and Section Point, produce the 2nd NSI signal and export in the described Section Point and terminate by the protection passage, after the service aisle fault between first node and Section Point, the break-through of execute protection passage, client's business of the described first node of break-through is to Section Point;
Described Section Point is used for after the service aisle fault between first node and Section Point, and client's business of the described first node on the protection passage is received in choosing.
A kind of method for transmitting signals is used for optical channel data cell sharing protection ring, and this method comprises:
Before the service aisle fault between first node and Section Point, first node obtains pre-transmission signals and exports the 3rd node to by the protection passage; The 3rd node after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through;
After the service aisle fault between first node and Section Point, first node is bridged to client's business the protection passage and transfers to the 3rd node, and client's business of the 3rd node described first node of break-through on the protection passage of break-through is to Section Point; Client's business of the described first node on the protection passage is received in described Section Point choosing.
A kind of method for transmitting signals is used for optical channel data cell sharing protection ring, and this method comprises:
Before the service aisle fault between first node and Section Point, first node produces a NSI signal and exports described the 3rd node to by the protection passage; Described the 3rd node after receiving a described NSI signal, the break-through of execute protection passage, the described NSI signal to the of break-through four intranodals terminations; Client's business to the five nodes of described the 4th node transmission oneself on the protection passage; Described the 5th node produces the 2nd NSI signal and terminates by protecting passage to export in the Section Point;
After the service aisle fault between first node and Section Point, described first node is bridged to protection channel transfer to the three nodes with the client's business of oneself; Client's business to the four nodes of the described first node of the 3rd node break-through; Described the 4th node after receiving described client's business, the break-through of execute protection passage, client's business to the five nodes of the described first node of break-through; Described the 5th node after receiving described client's business, the break-through of execute protection passage, client's business of the described first node of break-through is to Section Point; The described client's business on the protection passage is received in described Section Point choosing.
A kind of network node, the intermediate node as in the optical channel data cell sharing protection ring comprises:
Protection circuit unit, east side is used for before the service aisle fault, receive the pre-transmission signals that protection transmits on the passage after, with corresponding west side protection circuit unit break-through, described pre-transmission signals is transferred to protection circuit unit, described west side;
Protection circuit unit, described west side is used to receive described pre-transmission signals and output.
A technical scheme in the technique scheme has following beneficial effect:
Before the protection channel failure of intermediate node the 3rd node between first node and Section Point in the optical channel data cell sharing protection ring that the embodiment of the invention adopts; triggered execution break-through action by pre-transmission signals from first node; after the service aisle fault between first node and Section Point; directly break-through client business can be accelerated looped network protection switching speed.
Description of drawings
The ODUk protection rings structural representation that Fig. 1 a provides for prior art;
6 ring structure schematic diagrames of the ODUk_SPRing that Fig. 1 b provides for prior art;
The method for transmitting signals flow chart that Fig. 2 provides for the embodiment of the invention one;
The method for transmitting signals flow chart that Fig. 3 provides for the embodiment of the invention two;
The method for transmitting signals flow chart that Fig. 4 provides for the embodiment of the invention three;
The NSI signal structure schematic diagram that Fig. 5 provides for the embodiment of the invention;
The PM expense structure chart that Fig. 6 provides for the embodiment of the invention;
The TCM expense structure chart that Fig. 7 provides for the embodiment of the invention;
The looped network protection collocation method schematic diagram that Fig. 8 provides for the embodiment of the invention;
The schematic diagram that adopts TCM to monitor after the business configuration that Fig. 9 provides for the embodiment of the invention is finished;
The schematic diagram that the back adopts TCM to monitor is switched in the distally that Figure 10 provides for the embodiment of the invention;
The optical channel data cell sharing protection ring node structure figure that Figure 11 is provided for the embodiment of the invention four.
Embodiment
The embodiment of the invention provides a kind of optical channel data cell sharing protection ring; comprise: as the up and down first node and the Section Point of client's service node; optical fiber between first node and Section Point path, formed distally and nearside path; be positioned at the 3rd node on the path, described distally; be positioned on the path, described distally; and as up and down the 4th node and the 5th node of client's service node; path, described distally and nearside path comprise protection passage and service aisle again respectively; wherein; first node can be the node A in the subsequent embodiment; Section Point can be the Node B in the subsequent embodiment; the 3rd node can be the node C in the subsequent embodiment; the 4th node can be the node D in the subsequent embodiment, and the 5th node can be the node E in the subsequent embodiment.Its core concept is: before the protection channel failure, after receiving pre-transmission signals, carry out the break-through action as the 3rd node of intermediate node, and the pre-transmission signals of break-through, behind the protection channel failure, direct break-through client business.Wherein, pre-transmission signals is any signal except that extra traffic, such as, pre-transmission signals can be spacing wave indication (Null Signal Indication, NSI) signal or client's business.
The NSI signal that the embodiment of the invention provided can be produced and termination on the protection passage by ODUk cross unit or protection circuit unit.The OTN frame structure of this signal as shown in Figure 2, except that frame alignment expense, OTUk expense, TCMi expense, PM expense, " 01100110 " all can be filled in all territories (comprising other expenses and payload).
Wherein, RES is (Reserved keeps); TCM is (Tandem Connection Monitoring, polyphone connects supervision); ACT is (Activation activates); FTTL is (Failure Type FailureLocation, a fault type fault location); PM is (Path Monitoring, a path monitoring).
Wherein, in the NSI signal, the FTFL territory can be preserved for the insertion of O﹠M information, also can fill " 0,110 0110 ".Described O﹠M information is used for can also notifying other Operation Administration and Maintenance relevant information upstream failure reason notice downstream node.
Wherein PM expense concrete structure as shown in Figure 3, require TTI (trail trace identifier, TrailTrace Identifier) effective, BIP-8 (bit interleaves even parity check, Bit Interleaved Parity) is effective, BEI (oppositely error code indication, Backward Error Indication) effective, effectively, STAT (State) territory is 110 to BDI (oppositely defective indication, Backward Defect Indication).
For subnet connection/non-intervention surveillance style (Sub-network Connection/Non-intrusivemonitoring, SNC/N), according to the NSI signal, dEXC (the excessive defective of error code) and the mode of dDEG (signal degradation defect) obtained based on the error code Poisson distribution are specific as follows:
cDEG←dDEG?and(not?CI_SSF)and(not?dAIS)and(not?dOCI)and(notdLCK)and(not(dTIM?and(not?TIMActDis)))
cEXC←dEXC?and(not?CI_SSF)and(not?dAIS)and(not?dOCI)and(notdLCK)and(not(dTIM?and(not?TIMActDis)))
Wherein, DEG is deterioration (Degraded); EXC is excessive (Excessive); CI is characteristic information (Characteristic Information); SSF is service signal inefficacy (Server Signal Fail); AIS is alarm indication signal (Alarm Indication Signal).
Wherein,, only support dDEG to detect,, answer detecting signal degradation defect (dDEG) if detect DEGM (between 2 to 10, being provided with) individual continuous bad interval (be spaced apart and be used for 1 second cycle of performance monitoring) for original defects detection that burst distributes based on error code.If the errored block percentage that detects in an interval or errored block quantity 〉=degraded threshold (DEGTHR), this interval should be declared as bad interval so.For the defects detection based on the error code Poisson distribution of present increase, support dDEG and dEXC, if the BER (bit error rate) of equivalence is greater than the EXC thresholding of setting 10
-x, x=3,4 or 5 then should detect the excessive defective of error code (dEXC).If the error rate of equivalence is less than 10
-(x+1), should remove the excessive defective of error code.If the BER (bit error rate) of equivalence less than the EXC thresholding, continues to judge that whether BER is greater than the DEG thresholding of setting 10
-x, x=5,6,7,8 or 9 then answer detecting signal degradation defect (dDEG).If the error rate of equivalence is less than 10
-(x+1), signal degradation defect should be eliminated.Notice that the defects detection mechanism based on the error code Poisson distribution described here not only is applicable to the NSI signal on the protection passage, also is applicable to service aisle bearer service signal.
For subnet connection/non-intervention surveillance style (Sub-network Connection/Non-intrusivemonitoring, SNC/N), according to the NSI signal, obtain open connect indication fault (Cause OpenConnection Indication, mode cOCI) is specific as follows:
cOCI＝dTIM?and(AcTI＝0110?0110)and?dOCI；
Wherein, dTIM is trail trace identifier mismatch defective (Defect Trace IdentifierMismatch), refers to compare with expectation TTI accepting TTI, unanimity then represents not have TIM, this moment, dTIM was 0, and inconsistent then expression has TIM, and this moment, dTIM was 1.AcTI represents to accept trace identifier (Accepted Trace Identifier), if AcTI is 01100110, then (AcTI=0110 0110) is 1, otherwise is 0; DOCI determines that according to the value in STAT territory when the STAT territory was 110, dOCI was 1, otherwise dOCI is 0.And presentation logic expression formula " with ".When cOCI is 1, the protection channel failure that detected of expression then, when cOCI is 0, then the protection passage that detected of expression is normal.
If adopt the SNC/N monitoring mechanism, after node is received the NSI signal, will accept TTI with desirable T TI compares in the PM expense earlier, if inconsistent, dTIM is arranged then, dTIM is 1 at this moment.Judge then whether AcTI is unusual, judge just whether accepted TTI is 0,110 0110, if represent that then the source end does not insert normal TTI, causes protecting channel failure.Certainly can also continue to judge whether dOCI is 1, if then expression has OCI to report to the police, for NSI signal of the present invention, corresponding dOCI is 1 forever, thus this dOCI whether be 1 determining step not necessarily.
Wherein TCMi expense concrete structure requires TTI effective as shown in Figure 4, and BIP-8 is effective, and BEIi/BIAEi is effective, and effectively, the STAT territory is 110 to BDIi (oppositely defective indication, Backward Defect Indication).For subnet connection/sublayer surveillance style (Sub-networkConnection/Sub-layer monitoring, SNC/S), according to the TCMi in the NSI signal, the mode of obtaining the cOCI fault is specific as follows:
cOCI＝dTIM?and(AcTI＝0110?0110)and?dOCI；
Wherein, dTIM is trail trace identifier mismatch defective (Defect Trace IdentifierMismatch), refers to accept TTI and desirable T TI mates, unanimity then represents there is not the TIM defective, this moment, dTIM was 0, and inconsistent then expression has the TIM defective, and this moment, dTIM was 1.AcTI represents to accept trace identifier (Accepted Trace Identifier), is 01100110 if accepted TTI, and then (AcTI=0110 0110) is 1, otherwise is 0; DOCI determines that according to the value in STAT territory when the STAT territory was 110, dOCI was 1, otherwise dOCI is 0.And presentation logic expression formula " with ".When cOCI is 1, the protection channel failure that detected of expression then, when cOCI is 0, then the protection passage that detected of expression is normal.
If adopt the SNC/S monitoring mechanism, after node is received the NSI signal, will accept TTI with desirable T TI mates in the TCM expense earlier, if inconsistent, dTIM is arranged then, dTIM is 1 at this moment.Judge then whether unusual, judge just whether AcTI is 0,110 0110, if represent that then the source end does not insert normal TTI, causes protecting channel failure if having accepted TTI.Certainly can also continue to judge whether dOCI is 1, if then expression has OCI to report to the police, for NSI signal of the present invention, corresponding dOCI is 1 forever, thus this dOCI whether be 1 determining step not necessarily.
The embodiment of the invention one provides a kind of method for transmitting signals, consult Fig. 5,6 ring structures of ODUk_SPRing, on the ring between node A and the Node B, respectively dispose a business between node C and the node D, making node A, B, C, D is the last lower node of client's business, and the service priority between this method supposition node A and the Node B is the highest.
Before disconnected fine switching between node A and the Node B, node A produces the NSI signal, this NSI signal order on the protection passage terminates in Node B through node C, node D, node E, node F, make node C, node D, node E, node F that the passage break-through is protected to protection passage and east orientation in west separately, from the west to east, transmit above-mentioned NSI signal; Node B produces the NSI signal; this NSI signal order on the protection passage terminates in node A through node F, node E, node D, node C; make east orientation protection passage that node F, node E, node D, node C will be separately and west to the break-through of protection passage, from the east to the west the NSI signal that produced of transmission node B.
When disconnected fibre need be switched between node A and the Node B: only need node A, B to carry out bridge joint/choosing and receive action.Concrete: last client's business of node A is bridged to protection passage and service aisle, and to Node B, described client's business of transmitting on the protection passage is received in the Node B choosing to this client's work flow through node C, node D, node E, node F.Last client's business of Node B is bridged to protection passage and service aisle, and to node A, client's business of transmitting on the protection passage is received in node A choosing to this client's work flow through node F, node E, node D, node C.
When disconnected fibre needs the distally to switch between node D and the node E: need node D and node E to carry out bridge joint/choosing and receive action, node A, B execute protection passage break-through action.Concrete: node D is bridged to client's business away from the protection passage that lost efficacy; make last client's business of node D on the distal protection passage, arrive node E by node C, A, B, F; the business of transmitting on this distal protection passage is received in node E choosing, as following client's business of node E.Node E is bridged to client's business away from the protection passage that lost efficacy; make last client's business of node E on the distal protection passage, arrive node D by node F, B, A, C; the business of transmitting on this distal protection passage is received in node D choosing, as following client's business of node D.
Perhaps; before disconnected fine switching between node A and the Node B; node A is bridged to client's business protection passage and service aisle on both direction; Node B also is bridged to client's business protection passage and service aisle on both direction, at node C, D, E, F respectively with protection passage break-through that thing connected.Node A and Node B produce on the protection passage of distally and nearside respectively and termination client business, be specially: last client's business of node A arrives Node B after passing through node C, D, E, F on the distal protection passage, on nearside protection passage, be transferred to Node B simultaneously, receive for the Node B choosing as the following client of Node B is professional; Last client's business of Node B to node A, is transferred to node A simultaneously on nearside protection passage after passing through node F, E, D, C on the distal protection passage, supply node A choosing to receive as the following client of node A is professional.Thereby make the 1+1 protection that has constituted nearside protection passage and distal protection passage between node A and the Node B.
When disconnected fibre need be switched between node A and the Node B: only need node A, B to carry out choosing and receive action.Concrete: for last client's business of node A, always by node A distally and nearside protection channel transfer to Node B, Node B only need be carried out choosing and receive action, the choosing receipts just can realize purpose of the present invention from the distally or the nearside business of protecting passage to transmit; In like manner, for last client's business of Node B, arrive node A by Node B distally and nearside protection channel transfer, node A only need carry out choosing and receive action, the business of transmitting on choosing receipts distally or the nearside protection passage always.
When disconnected fibre needs the distally to switch between node D and the node E: need node D and node E to carry out bridge joint/choosing and receive action, node A, B execute protection passage break-through action.Concrete: node D is bridged to client's business away from the protection passage that lost efficacy; make last client's business of node D on the distal protection passage, arrive node E by node C, A, B, F; the business of transmitting on this distal protection passage is received in node E choosing, as following client's business of node E.Node E is bridged to client's business away from the protection passage that lost efficacy; make last client's business of node E on the distal protection passage, arrive node D by node F, B, A, C; the business of transmitting on this distal protection passage is received in node D choosing, as following client's business of node D.
The embodiment of the invention two provides a kind of method for transmitting signals; consult Fig. 6; 6 ring structures of ODUk_SPRing; on the ring between node A and the Node B; respectively dispose a business between node C and the node D; making node A, B, C, D is the last lower node of client's business, selects the sourcesink node of node A as pre-transmission signals on the protection passage on client's business in the lower node.
Before disconnected fine switching between node A and the Node B, node A sends and the pre-transmission signals that terminates on the both direction of protection passage, consults the dotted line among Fig. 4.The two-way break-through on loopful protection passage of pre-transmission signals makes the pre-break-through of protection passage of node C, D, E, F.
When pre-transmission signals is the last client of A node when professional, before the service aisle fault, node A can be bridged to client's business the protection passage on the both direction between node A and the Node B.When disconnected fibre needed the distally to switch between node A and the Node B: need Node B to carry out bridge joint/choosing and receive action, node A only carried out choosing and receives action.Concrete: the last client of node A professional by node C, D, E, F to Node B, the Node B choosing is received from protecting business that passage the transmits following client's business as Node B; Last client's business of Node B is transferred to node A by F, E, D, C, and this business of transmitting from the protection passage following client's business as node A is received in node A choosing.
When disconnected fibre between node D and the node E need carry out the distally when switching: need node D, E to carry out bridge joint/choosing and receive and move, node A is with protection passage break-through that East and West direction connected.Concrete: node D will go up client's business and be bridged to away from the protection passage that lost efficacy, last client's business of node D arrives node E by node C, A, B, F on the protection passage, the following client business of this business of transmitting from the protection passage as node E received in node E choosing; To go up client's business in the node E and be bridged to away from the protection passage that lost efficacy, last client's business of node E arrives node D by node F, B, A, C on the protection passage, and node D choosing is received this from the business protecting passage and the receive following client's business as node D.
When pre-transmission signals is that (Null Signal Indication, NSI) during signal, node A is as the sourcesink node of this NSI signal for spacing wave indication.When disconnected fibre between node A and the Node B need carry out the distally when switching: need Node B to carry out bridge joint/choosing and receive action, node A carries out bridge joint/choosing receipts and moves.Concrete, node A will go up client's business and be bridged to away from the protection passage that lost efficacy, the last client of node A professional by node C, D, E, F to Node B, the Node B choosing is received from the business of the protecting channel transfer following client's business as Node B.Node B will go up client's business and be bridged to away from the protection passage that lost efficacy, and last client's business of Node B is transferred to node A by F, E, D, C, and node A choosing is received from the business of the protecting channel transfer following client's business as node A.
When pre-transmission signals was the NSI signal, the action step that needs when disconnected fibre need be switched between node D and the node E was identical when being client's business with above-mentioned pre-transmission signals.
The embodiment of the invention three provides a kind of method for transmitting signals; consult Fig. 7; 6 ring structures of ODUk_SPRing; on the ring between node A and the Node B; respectively dispose a business between node C and the node D; make node A, B, C, D last lower node, the lower node NSI signal that all on the protection passage, produces and terminate on all client's business in this method for client's business.
Before disconnected fine switching between node A and the Node B, node A, B, D, E produce and termination is protected the NSI signal that transmits on the passage, the two-way break-through NSI of node C, F protection passage signal.For node A, B, the protection passage generation/termination client business of nearside between A, B, the protection passage generation/termination NSI signal in distally between A, B; Concrete: node A produces a NSI signal and transfers to node C on the path, distally, node C execute protection passage break-through action, and break-through the one NSI signal terminates to node D.Reverse, node D produces the NSI signal and transfers to node C, node C execute protection passage break-through action, and this NSI signal of break-through terminates to A.For node D, E, the protection passage generation/termination client business of nearside between D, E, the protection passage generation/termination NSI signal in distally between D, E; Concrete: node E produces the 2nd NSI signal and transfers to node F on the path, distally, node F execute protection passage break-through action, and break-through the 2nd NSI signal terminates to Node B.Reverse, Node B produces the NSI signal and transfers to node F, node F execute protection passage break-through action, and this NSI signal of break-through terminates to node E.
When disconnected fibre needed the distally to switch between node A and the Node B: need node A and Node B to carry out bridge joint/choosing and receive action, node D, E were with the break-through of transmeridional protection passage.Concrete: node A will go up client's business and be bridged to away from the protection passage that lost efficacy, and the last client of node A is professional to arrive Node B by node C, D, E, F, and Node B choosing receipts are from the business protecting passage and the transmit following client's business as Node B; Same, Node B will go up client's business and be bridged to away from the protection passage that lost efficacy, and make that the last client of Node B is professional to arrive node A by node F, E, D, C, and the business transmitted on the passage following client's business as node A of protecting is received in node A choosing.
When disconnected fibre between node D and the node E need carry out the distally when switching: need node D and node E to carry out bridge joint/choosing and receive and move, node A, B be the break-through of transmeridional protection passage, makes a concrete analysis of similar to the abovely, do not repeat them here.
When in each embodiment of the invention described above, having described the service aisle fault between node A and the Node B, switch, be positioned at the pre-break-through of node C on the path, distally to the distal protection passage between node A and Node B; When the technical scheme that the embodiment of the invention provided is equally applicable to service aisle fault between node A and the Node B; switch to the protection of the nearside between node A and Node B passage; suppose node C is arranged on the minor axis between node A and the Node B; node C will protect the pre-break-through of passage by transmitting client's service signal or NSI signal; therefore; carry out nearside when switching, need when switching, not carry out the break-through action, saving switching time.
Fig. 8 shows the looped network protection collocation method schematic diagram that the embodiment of the invention provides, and specifically comprises step:
Above-mentioned user selects SNC/S; and further select TCM6 to show: the service aisle on the ring between A, the B; service aisle between D, the E; protection passage between A, the B; protection passage between D, the E; protection passage between A, the D (through C), the protection passage between E, the B (through F) all adopts TCM6 to monitor.
What step 804, supposition user selected is lower node client service concurrence protection passage on the highest priority traffic; further select the highest business of priority in prompting user all business on being configured to protected wavelength, suppose that the user selects the service priority between A, the B the highest.
What step 806, supposition user selected is that single node client business is protected passage up and down, further points out the user to select: specified automatically by system that lower node still be user's appointment on the protection channel service.If the user selects manual appointment, then webmaster provides all node confession user selections of client's business up and down, supposes that the user selects node A; If system specifies automatically, system automatically specified node A as the sourcesink node of protection passage pre-transmission signals.
What step 808, supposition user selected is that all client's business are protected passage up and down, and node A, B, D, E produce and termination is protected the NSI signal that transmits on the passage, the two-way break-through NSI of node C, F signal.
Fig. 9 shows channel service configuration finish after, adopt TCM to monitor schematic diagram, what this figure supposed that the user selects is that all client's business are protected passage up and down.As can be seen from this figure, between A, the B, the service aisle between D, the E is is normally received and dispatched the client's business after the encapsulation, and service aisle between A, the B and nearside protection passage adopt the TCM6 rank to monitor; Service aisle between D, the E and nearside protection passage adopt the TCM6 rank to monitor; Protection passage (through E) between protection passage between A, the D (through C) and D, the F adopts the TCM6 rank to monitor.
Concrete; when disconnected fibre causes the distally to be switched between A, the B, according to APS information mutual between A, the B, node A will go up client's business and send to node C away from the inefficacy section; because the protection passage of node C has preset break-through, so the last client of node C transparent transmission A node is professional to node D.Node D is the node of client's business up and down; this node D is according to APS information; know that A breaks down to the service aisle of B; the last client's business that needs transmission A; East and West direction is protected the passage break-through; last client's business of A node is transparent to node E, and the TCM6 expense that no longer terminates is simultaneously exported the TCM6 transparent transmission.In like manner, node E knows that according to APS information A breaks down to the service aisle of B, needs last client's business of transmission A, and East and West direction is protected the passage break-through, and last client's business of A node is transparent to F, and the while TCM6 expense that no longer terminates is with the transparent output of TCM6.Because the C node has preset break-through, directly last client's business of transparent transmission A node, TCM6 expense are to Node B.Node B is from receiving the professional and TCM expense that terminates of client of protection passage away from the node F choosing of inefficacy section.It is switched the back and adopts TCM supervision schematic diagram to consult Figure 10.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, for example, read-only memory, disk or CD etc.
The embodiment of the invention four provides a kind of network node, comprising:
The NSI signal processing unit is used to obtain pre-transmission signals and the pre-transmission signals of described acquisition is handled, and obtains line-side signal; Wherein, pre-transmission signals can be the NSI signal;
The ripple unit is closed in protection, is used for described line-side signal multiplexingly, and the multiplexing signal that obtains is transmitted on the passage in protection.
Concrete, consult Figure 11, the NSI signal processing unit comprises: cross unit is used to produce the NSI signal; The protection circuit unit is used for described NSI signal adaptation is become line side OCh signal.Wherein, cross unit can be the ODUk cross unit;
Perhaps, the NSI signal processing unit is the protection circuit unit, is used to produce the NSI signal, and described NSI signal adaptation is become line side OCh signal.
The looped network protection of supposition configuration is a 4F Ring below, wherein disposes a plurality of protection groups, such as M; M＞1, the west to corresponding I to M line unit to (I and I ' they are a pair of, and M and M ' they are a pair of; wherein; I ' and M ' are the protection circuit unit, and I and M are the working line unit), the corresponding N of east orientation to O line unit to (N and N ' they are a pair of; O and O ' are a pair of; wherein, N ' and O ' are the protection circuit unit, and N and O are the working line unit).
For making the embodiment of the invention clearer, below earlier tributary unit, ODUk cross unit, line unit, the function of closing the ripple unit and annexation are done simple the introduction:
Wherein, tributary unit is finished the adaption function between client's service signal and the ODUk signal, is about to client's service signal and is fitted in the ODUk signal, also can oppositely the ODUk signal be separated to be fitted in client's service signal;
The ODUk cross unit is finished the cross connect function of ODUk signal, and the ODUk signal that arbitrary line unit or arbitrary tributary unit can be brought is delivered in arbitrary line unit or the arbitrary tributary unit and gone.
Line unit is finished the adaption function between ODUk signal and the OCh signal, can also can oppositely the ODUk signal be solved from line side OCh signal and give ODUk cross unit with the ODUk signal adaptation of ODUk cross unit side in the OCh signal of line side.
Close the ripple unit, handle by OMS and OTS section layer, OCh signal and other wavelength signals are multiplexed into light delivery module, and (Optical Transport Module, OTM) signal transmits in the optical fiber of line side.
Suppose last client's business, send to Node B for A.The network node that the embodiment of the invention provided is node A; before the service aisle fault; ODUk cross unit by node A generates the NSI signal and sends the protection circuit unit to; also can produce the NSI signal by the protection circuit unit, the NSI signal obtains after through adaption function and termination function delivering to behind the OCh signal and closes the ripple unit.After the service aisle fault; protection passage carrying client business; at this moment; by the ODUk cross unit of node A the ODUk signal that self tributary unit obtains directly is crossed to the protection circuit unit, the protection circuit unit is received behind the ODUk signal through obtaining the OCh signal behind adaption function and the termination function and is transferred to and closes the ripple unit.
The embodiment of the invention five provides a kind of network node, and the intermediate node as in the optical channel data cell sharing protection ring comprises:
Protection circuit unit, east side after being used to receive the pre-transmission signals that transmits on the protection passage, with corresponding west side protection circuit unit break-through, is transferred to protection circuit unit, described west side with described pre-transmission signals;
Protection circuit unit, described west side is used to receive described pre-transmission signals and output.
The BER computing unit is used for based on Poisson distribution, calculating bit error rate BER according to the pre-transmission signals that transmits on the protection passage or the BIP of service aisle signal;
The defective determining unit is used to judge described BER whether greater than the thresholding of the excessive EXC of error code, if, report the excessive defective dEXC of error code, if not, judge that described BER is whether greater than the thresholding of Signal Degrade DEG, if report signal degradation defect dDEG.
The embodiment of the invention six provides a kind of optical channel data cell sharing protection ring; comprise: as the up and down first node and the Section Point of client's service node; optical fiber between first node and Section Point path, formed distally and nearside path; be positioned at the 3rd node on the path, described distally; wherein
Described first node, before being used for the service aisle fault between first node and Section Point, obtain pre-transmission signals and export described the 3rd node to by the protection passage, after the service aisle fault between first node and Section Point, client's business of first node is bridged to the protection passage and transfers to the 3rd node;
Described the 3rd node, be used for after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through, after the service aisle fault between first node and Section Point, client's business of the described first node of break-through is to Section Point on the protection passage of break-through;
Described Section Point is used for after the service aisle fault between first node and Section Point, and client's business of the described first node on the protection passage is received in choosing.
Wherein, described pre-transmission signals is: last client's business of spacing wave indication NSI signal or described first node.
Wherein, when described pre-transmission signals is the NSI signal, comprise trail trace identifier TTI in the described NSI signal; Described Node B also is used for judging whether to exist trace identifier mismatch TIM according to the TTI of described NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described node A to the protection channel failure between Node B.
Described optical channel data cell sharing protection ring also comprises: be positioned on the path, described distally and as the 4th node and the 5th node of client's service node up and down; described the 3rd node is between first node and the 4th node; when the service priority between first node and the Section Point is the highest; and before the service aisle fault
Described the 3rd node is used for after receiving described pre-transmission signals, the break-through of execute protection passage, described the 4th node that transmits signals in advance of break-through;
Described the 4th node is used for after receiving described pre-transmission signals, the break-through of execute protection passage, described the 5th node that transmits signals in advance of break-through;
Described the 5th node is used for after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through.
During service aisle fault between the 4th node to the five nodes, described the 4th node also is used for client's business of the 4th node is bridged to the protection passage and is transferred to the 3rd node; Described the 3rd node, the client who is used for described the 4th node of break-through is professional to described first node; Described first node also is used for after receiving client's business of described the 4th node, the break-through of execute protection passage, and the client of described the 4th node of break-through is professional to Section Point; Described Section Point also is used for after receiving client's business of described the 4th node, the break-through of execute protection passage, client's business to the five nodes of described the 4th node of break-through; Described the 5th node is used to select client's business of receiving described the 4th node on the protection passage.
The embodiment of the invention seven provides a kind of optical channel data cell sharing protection ring; comprise: as the up and down first node and the Section Point of client's service node; optical fiber between first node and Section Point path, formed distally and nearside path; be positioned at the 3rd node on the path, described distally; be positioned on the path, described distally and as the 4th node and the 5th node of client's service node up and down; wherein
Described first node, before being used for the service aisle fault between first node and Section Point, produce a NSI signal and export described the 3rd node to by the protection passage, after the service aisle fault between first node and Section Point, client's business of first node is bridged to the protection passage and transfers to the 3rd node;
Described the 3rd node, be used for after receiving a described NSI signal break-through of execute protection passage, the described NSI signal to the of break-through four intranodals termination, after the service aisle fault between first node and Section Point, client's business to the four nodes of the described first node of break-through;
Described the 4th node, before being used for the service aisle fault between first node and Section Point, client's business to the five nodes of transmission oneself on the protection passage, after the service aisle fault between first node and Section Point, the break-through of execute protection passage, client's business to the five nodes of the described first node of break-through;
Described the 5th node, before being used for the service aisle fault between first node and Section Point, produce the 2nd NSI signal and export in the described Section Point and terminate by the protection passage, after the service aisle fault between first node and Section Point, the break-through of execute protection passage, client's business of the described first node of break-through is to Section Point;
Described Section Point is used for after the service aisle fault between first node and Section Point, and client's business of the described first node on the protection passage is received in choosing.
Wherein, comprise TTI in the described NSI signal;
Described the 4th node also is used for judging whether to exist TIM according to the TTI of a described NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described first node to the four internodal protection channel failures;
And/or, comprise TTI in described the 2nd NSI signal;
Described Section Point also is used for judging whether to exist TIM according to the TTI of described the 2nd NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described the 5th node to the protection channel failure between Section Point.
As seen from the above analysis, the embodiment of the invention has following beneficial effect:
1, before the protection channel failure of intermediate node the 3rd node between first node and Section Point in the optical channel data cell sharing protection ring of embodiment of the invention employing; triggered execution break-through action by pre-transmission signals from first node; after the service aisle fault between first node and Section Point; directly break-through client business can be accelerated looped network protection switching speed.
2, comprise TTI in the NSI signal in the embodiment of the invention; the node of termination NSI signal judges whether to exist trace identifier mismatch TIM according to the TTI in the NSI signal; if there is TIM; judge again whether TTI is unusual; if TTI is unusual, then report the protection channel failure of NSI signal institute break-through, therefore; transmission NSI signal on the protection passage can detect whether fault of protection passage at any time.
3, existing OTN only supports the error code burst to distribute; and in certain error rate scope; based on defects detection time of error code Poisson distribution will the fast mistake defects detection time that burst distributes based on error code; the OTN network support that the embodiment of the invention provided can obtain protection switch time faster based on the defect monitoring of error code Poisson distribution under special scenes.
More than a kind of optical channel data cell sharing protection ring provided by the present invention, method for transmitting signals and network node are described in detail; for one of ordinary skill in the art; thought according to the embodiment of the invention; part in specific embodiments and applications all can change; in sum, this description should not be construed as limitation of the present invention.
Claims (17)
1. an optical channel data cell sharing protection ring is characterized in that, comprising: first node, Section Point and the 3rd node, wherein,
Described first node, before being used for the service aisle fault between first node and Section Point, obtain pre-transmission signals and export described the 3rd node to by the protection passage, after the service aisle fault between first node and Section Point, client's business of first node is bridged to the protection passage and transfers to the 3rd node; Wherein, pre-transmission signals is any signal except that extra traffic;
Described the 3rd node, be used for after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through, after the service aisle fault between first node and Section Point, client's business of the described first node of break-through is to Section Point on the protection passage of break-through;
Described Section Point is used for after the service aisle fault between first node and Section Point, and client's business of the described first node on the protection passage is received in choosing.
2. optical channel data cell sharing protection ring according to claim 1 is characterized in that,
Described pre-transmission signals is: last client's business of spacing wave indication NSI signal or first node.
3. according to the optical channel data cell sharing protection ring shown in the claim 2, when described pre-transmission signals is the NSI signal, it is characterized in that,
Comprise trail trace identifier TTI in the described NSI signal;
Described Section Point also is used for judging whether to exist trace identifier mismatch TIM according to the TTI of described NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described first node to the protection channel failure between Section Point.
4. optical channel data cell sharing protection ring according to claim 1; it is characterized in that; described optical channel data cell sharing protection ring also comprises: be positioned on the path, distally and as the 4th node and the 5th node of client's service node up and down; described the 3rd node is between first node and the 4th node; when the service priority between first node and the Section Point is the highest; and before the service aisle fault
Described the 3rd node is used for after receiving described pre-transmission signals, the break-through of execute protection passage, described the 4th node that transmits signals in advance of break-through;
Described the 4th node is used for after receiving described pre-transmission signals, the break-through of execute protection passage, described the 5th node that transmits signals in advance of break-through;
Described the 5th node is used for after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through.
5. when optical channel data cell sharing protection ring according to claim 4, service aisle fault between the 4th node to the five nodes, it is characterized in that,
Described the 4th node also is used for client's business of the 4th node is bridged to the protection passage and is transferred to the 3rd node;
Described the 3rd node, the client who is used for described the 4th node of break-through is professional to described first node;
Described first node also is used for after receiving client's business of described the 4th node, the break-through of execute protection passage, and the client of described the 4th node of break-through is professional to Section Point;
Described Section Point also is used for after receiving client's business of described the 4th node, the break-through of execute protection passage, client's business to the five nodes of described the 4th node of break-through;
Described the 5th node is used to select client's business of receiving described the 4th node on the protection passage.
6. an optical channel data cell sharing protection ring is characterized in that, comprising: first node, Section Point, the 3rd node, the 4th node and the 5th node, wherein,
Described first node, before being used for the service aisle fault between first node and Section Point, produce first spacing wave indication NSI signal and export described the 3rd node to by the protection passage, after the service aisle fault between first node and Section Point, client's business of first node is bridged to the protection passage and transfers to the 3rd node;
Described the 3rd node, be used for after receiving a described NSI signal break-through of execute protection passage, the described NSI signal to the of break-through four intranodals termination, after the service aisle fault between first node and Section Point, client's business to the four nodes of the described first node of break-through;
Described the 4th node, before being used for the service aisle fault between first node and Section Point, client's business to the five nodes of transmission oneself on the protection passage, after the service aisle fault between first node and Section Point, the break-through of execute protection passage, client's business to the five nodes of the described first node of break-through;
Described the 5th node, before being used for the service aisle fault between first node and Section Point, produce the 2nd NSI signal and export in the described Section Point and terminate by the protection passage, after the service aisle fault between first node and Section Point, the break-through of execute protection passage, client's business of the described first node of break-through is to Section Point;
Described Section Point is used for after the service aisle fault between first node and Section Point, and client's business of the described first node on the protection passage is received in choosing.
7. according to the optical channel data cell sharing protection ring shown in the claim 6, it is characterized in that,
Comprise TTI in the described NSI signal;
Described the 4th node also is used for judging whether to exist TIM according to the TTI of a described NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described first node to the four internodal protection channel failures;
And/or,
Comprise TTI in described the 2nd NSI signal;
Described Section Point also is used for judging whether to exist TIM according to the TTI of described the 2nd NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described the 5th node to the protection channel failure between Section Point.
8. a method for transmitting signals is used for optical channel data cell sharing protection ring, it is characterized in that, this method comprises:
Before the service aisle fault between first node and Section Point, first node obtains pre-transmission signals and exports the 3rd node to by the protection passage; The 3rd node after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through; Wherein, pre-transmission signals is any signal except that extra traffic;
After the service aisle fault between first node and Section Point, first node is bridged to client's business the protection passage and transfers to the 3rd node, and client's business of the 3rd node described first node of break-through on the protection passage of break-through is to Section Point; Client's business of the described first node on the protection passage is received in described Section Point choosing.
9. the method shown in according to Claim 8 is characterized in that,
Described pre-transmission signals is: last client's business of spacing wave indication NSI signal or first node.
10. according to the method shown in the claim 9, when described pre-transmission signals is the NSI signal, it is characterized in that, comprise trail trace identifier TTI in the described NSI signal;
This method also comprises: described Section Point judges whether to exist trace identifier mismatch TIM according to the TTI in the described NSI signal; if there is TIM; judge again whether TTI is unusual,, report described first node to the protection channel failure between Section Point if TTI is unusual.
11. the method according to Claim 8 is characterized in that, when the service priority between first node and the Section Point is the highest,
The described Section Point that transmits signals in advance of the 3rd node break-through is specially:
Described conduct the 4th node of client's service node up and down that transmits signals in advance of described the 3rd node break-through; Described the 4th node after receiving described pre-transmission signals, the break-through of execute protection passage, break-through is described to be transmitted signals in advance as the 5th node of client's service node up and down; Described the 5th node after receiving described pre-transmission signals, the break-through of execute protection passage, the described Section Point that transmits signals in advance of break-through.
12. when method according to claim 11, service aisle fault between the 4th node to the five nodes, it is characterized in that this method also comprises:
Described the 4th node is bridged to the client's business of self the protection passage and is transferred to first node by the 3rd node; Described first node after receiving client's business of described the 4th node, the break-through of execute protection passage, the client of described the 4th node of break-through is professional to Section Point; Described Section Point after receiving client's business of described the 4th node, the break-through of execute protection passage, client's business to the five nodes of described the 4th node of break-through; Client's business of the above the 4th node of protection passage is received in described the 5th node choosing.
13. method according to claim 8 is characterized in that, this method also comprises:
Interleave even parity check BIP according to the bit in the pre-transmission signals that transmits on the protection passage,, calculate bit error rate BER based on Poisson distribution; Judge described BER whether greater than the thresholding of the excessive EXC of error code, if, report the excessive defective dEXC of error code, if not, judge that described BER is whether greater than the thresholding of Signal Degrade DEG, if report signal degradation defect dDEG;
And/or,
According to the BIP in the signal that transmits on the service aisle,, calculate bit error rate BER based on Poisson distribution; Judge described BER whether greater than the thresholding of the excessive EXC of error code, if, report the excessive defective dEXC of error code, if not, judge that described BER is whether greater than the thresholding of Signal Degrade DEG, if report signal degradation defect dDEG.
14. a method for transmitting signals is used for optical channel data cell sharing protection ring, it is characterized in that, this method comprises:
Before the service aisle fault between first node and Section Point, first node produces first spacing wave indication NSI signal and exports described the 3rd node to by the protection passage; Described the 3rd node after receiving a described NSI signal, the break-through of execute protection passage, the described NSI signal to the of break-through four intranodals terminations; Client's business to the five nodes of described the 4th node transmission oneself on the protection passage; Described the 5th node produces the 2nd NSI signal and terminates by protecting passage to export in the Section Point;
After the service aisle fault between first node and Section Point, described first node is bridged to protection channel transfer to the three nodes with the client's business of oneself; Client's business to the four nodes of the described first node of the 3rd node break-through; Described the 4th node after receiving described client's business, the break-through of execute protection passage, client's business to the five nodes of the described first node of break-through; Described the 5th node after receiving described client's business, the break-through of execute protection passage, client's business of the described first node of break-through is to Section Point; The described client's business on the protection passage is received in described Section Point choosing.
15. the method according to shown in the claim 14 is characterized in that,
Comprise trail trace identifier TTI in the described NSI signal;
This method also comprises:
Described the 4th node judges whether to exist TIM according to the TTI in the described NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described first node to the four internodal protection channel failures;
And/or,
Comprise trail trace identifier TTI in described the 2nd NSI signal;
Described Section Point judges whether to exist TIM according to the TTI in described the 2nd NSI signal, if there is TIM, judges whether TTI is unusual again, if TTI is unusual, reports described the 5th node to the protection channel failure between Section Point.
16. method according to claim 14 is characterized in that, this method also comprises:
Interleave even parity check BIP according to the bit in the pre-transmission signals that transmits on the protection passage,, calculate bit error rate BER based on Poisson distribution; Judge described BER whether greater than the thresholding of the excessive EXC of error code, if, report the excessive defective dEXC of error code, if not, judge described BER whether greater than the thresholding of Signal Degrade DEG, if, report signal degradation defect dDEG,
And/or,
According to the BIP in the signal that transmits on the service aisle,, calculate bit error rate BER based on Poisson distribution; Judge described BER whether greater than the thresholding of the excessive EXC of error code, if, report the excessive defective dEXC of error code, if not, judge that described BER is whether greater than the thresholding of Signal Degrade DEG, if report signal degradation defect dDEG.
17. a network node, the intermediate node as in the optical channel data cell sharing protection ring is characterized in that, comprising:
Protection circuit unit, east side is used for before the service aisle fault, receive the pre-transmission signals that protection transmits on the passage after, with corresponding west side protection circuit unit break-through, described pre-transmission signals is transferred to protection circuit unit, described west side; Wherein, pre-transmission signals is any signal except that extra traffic;
Protection circuit unit, described west side is used to receive described pre-transmission signals and output.
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| CN2008100950278A CN101471837B (en) | 2007-12-27 | 2008-04-23 | Optical channel data cell sharing protection ring, signal transmission method and network node |
| PCT/CN2008/073776 WO2009082970A1 (en) | 2007-12-27 | 2008-12-26 | Sharing protection ring of data cell of optical channel, signal transmission method and network node |
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| CN200710307027.5 | 2007-12-27 | ||
| CN2008100950278A CN101471837B (en) | 2007-12-27 | 2008-04-23 | Optical channel data cell sharing protection ring, signal transmission method and network node |
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| CN103179013B (en) * | 2011-12-21 | 2019-03-12 | 中兴通讯股份有限公司 | A kind of realization method and system of looped network protection |
| CN103997426B (en) * | 2013-02-17 | 2018-11-16 | 中兴通讯股份有限公司 | The detection method and node of subframe incorrect order in a kind of inverse multiplexing |
| CN106911377A (en) * | 2015-12-23 | 2017-06-30 | 中国移动通信集团内蒙古有限公司 | A kind of guard method of TD-LTE business and system |
| CN107800558B (en) * | 2016-09-05 | 2022-04-29 | 中兴通讯股份有限公司 | Fault determination method, information sending method, device, source end equipment and sink end equipment |
| CN106452910B (en) * | 2016-11-07 | 2019-09-17 | 瑞斯康达科技发展股份有限公司 | A kind of method and node of determining switching time |
| CN109104348B (en) | 2017-06-21 | 2020-09-15 | 比亚迪股份有限公司 | Train network data transmission method, system and device based on CANopen protocol |
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