WO2009082970A1 - Anneau de protection de partage d'une cellule de données de canal optique, procédé de transmission du signal et nœud de réseau - Google Patents

Anneau de protection de partage d'une cellule de données de canal optique, procédé de transmission du signal et nœud de réseau Download PDF

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Publication number
WO2009082970A1
WO2009082970A1 PCT/CN2008/073776 CN2008073776W WO2009082970A1 WO 2009082970 A1 WO2009082970 A1 WO 2009082970A1 CN 2008073776 W CN2008073776 W CN 2008073776W WO 2009082970 A1 WO2009082970 A1 WO 2009082970A1
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WIPO (PCT)
Prior art keywords
node
signal
channel
protection
protection channel
Prior art date
Application number
PCT/CN2008/073776
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English (en)
Chinese (zh)
Inventor
Gen CHEN
Bo Zhang
Jun Yan
Zhenyu Li
Yu Zeng
Da He
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN2008100950278A external-priority patent/CN101471837B/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009082970A1 publication Critical patent/WO2009082970A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0283—WDM ring architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0287—Protection in WDM systems
    • H04J14/0293—Optical channel protection
    • H04J14/0295—Shared protection at the optical channel (1:1, n:m)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/08—Intermediate station arrangements, e.g. for branching, for tapping-off
    • H04J3/085—Intermediate station arrangements, e.g. for branching, for tapping-off for ring networks, e.g. SDH/SONET rings, self-healing rings, meashed SDH/SONET networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0057—Operations, administration and maintenance [OAM]
    • H04J2203/006—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1652—Optical Transport Network [OTN]

Definitions

  • Optical channel data unit shared protection ring, signal transmission method and network node The application is submitted to the Chinese Patent Office on December 27, 2007, and the application number is 200710307027.5.
  • the invention name is "optical ring network, protection channel signal transmission method and network node”.
  • Priority of the Chinese patent application, and the priority of the Chinese patent application submitted to the China Patent Office on April 23, 2008, application number 200810095027.8, and the invention titled "optical channel data unit shared protection ring, signal transmission method and network node” The entire contents of which are incorporated herein by reference.
  • the present invention relates to the field of communications technologies, and in particular, to an optical channel data unit shared protection ring, a signal transmission method, and a network node.
  • the optical transport network (OTN) architecture includes: an Optical Transmission Section (OTS) layer, an Optical Multiplex Section (OMS) layer, an Optical Channel (OCh) layer, and an optical channel transmission.
  • OTS Optical Transmission Section
  • OMS Optical Multiplex Section
  • OCh Optical Channel
  • ODUk SPRing The ODUk Shared Protection Ring (ODUk SPRing) is located at the ODU layer.
  • the structure is shown in Figure la. The figure identifies 1, 2, 3, and 4 work services.
  • the source and sink nodes of each work service are customer services. Up and down ODUk - SPRing node.
  • ODUk—SPRing protection is source-sink (STEERING) protection.
  • STERING source-sink
  • the protection channel sharing feature of the shared protection ring determines whether there is one or more working services on the ring, the protection channel cannot be occupied according to the protection mode of the chain or other ring network.
  • the optical channel data unit The intermediate node of the shared protection ring does not pass through. After the protection switching is triggered, the intermediate node needs to pass the protection channel for at least 2 ms.
  • the ODUk-SPRing diagram of OTN shows the 6-point ring structure diagram of ODUk-SPRing.
  • the A and B nodes are for the customer service.
  • the node when the short-path is broken between A and B, the A and B nodes act as the switching node to perform the source-sink type (STEERING) action, and the C, D, E, and F nodes act as the intermediate nodes of the protection channel to perform the punch-through, because each It takes at least 2ms for the intermediate nodes to perform the punch-through.
  • the inventor has found that the prior art has the following problems: In the prior art, after the protection switching is triggered, the intermediate node performs the punch-through, and the intermediate node passes through for too long, so that the switching time is long. Increase, when switching, will cause unnecessary loss of transmission business, resulting in decreased customer satisfaction.
  • the technical problem to be solved by the embodiments of the present invention is to provide an optical channel data unit shared protection ring, a signal transmission method, and a network node capable of accelerating the ring network protection switching speed.
  • An optical channel data unit sharing protection ring includes: a first node, a second node, and a third node, where
  • the first node is configured to obtain a pre-transmission signal and output to the third node through the protection channel before the working channel failure between the first node and the second node, and work between the first node and the second node After the channel is faulty, the client service of the first node is bridged to the protection channel and transmitted to the third node; the third node is configured to perform the protection channel punch-through after the pre-transmission signal is received, and the pre-transmission is performed through the pre-transmission Transmitting the signal to the second node, after the working channel between the first node and the second node is faulty, penetrating the client service of the first node to the second node on the bypassed protection channel;
  • the second node is configured to select, after the fault of the working channel between the first node and the second node, the customer service of the first node on the protection channel.
  • An optical channel data unit shared guard ring including: a first node, a second node, a third node, a fourth node, and a fifth node, where
  • the first node is configured to generate a first step before a working channel failure between the first node and the second node
  • An NSI signal is output to the third node through the protection channel, and after the working channel between the first node and the second node is faulty, the customer service of the first node is bridged to the protection channel and transmitted to the third node;
  • a third node configured to perform a protection channel punch-through after receiving the first NSI signal, and pass through the first NSI signal to terminate in a fourth node, after a working channel failure between the first node and the second node Passing through the customer service of the first node to the fourth node;
  • the fourth node is configured to transmit its own client service to the fifth node on the protection channel before the working channel failure between the first node and the second node, and the working channel between the first node and the second node is faulty After the protection channel is punched through, the customer service of the first node is punched through to the fifth node;
  • the fifth node is configured to generate a second NSI signal and output the protection to the second node through the protection channel before the working channel failure between the first node and the second node, where the first node and the second node are After the working channel fails, the protection channel is punched through, and the customer service of the first node is punched through to the second node;
  • the second node is configured to select, after the fault of the working channel between the first node and the second node, the customer service of the first node on the protection channel.
  • a signal transmission method for an optical channel data unit to share a guard ring comprising: before a working channel failure between the first node and the second node, the first node obtains a pre-transmission signal and outputs the third to the third through the protection channel a third node, after receiving the pre-transmission signal, performing a protection channel punch-through, and penetrating the pre-transmission signal to the second node;
  • the first node bridges the client service to the protection channel and transmits to the third node, and the third node passes through the first node client on the punched protection channel.
  • the service to the second node; the second node selects a customer service of the first node on the protection channel.
  • a signal transmission method for an optical channel data unit to share a guard ring comprising: before a working channel failure between the first node and the second node, the first node generates a first NSI signal and outputs the same through the protection channel a third node; after receiving the first NSI signal, the third node performs a protection channel punch-through, and passes through the first NSI signal to terminate in a fourth node; and the fourth node transmits on the protection channel The customer service to the fifth node; the fifth node generates a second NSI signal and outputs the result to the second node through the protection channel;
  • the service bridge is connected to the protection channel and transmitted to the third node; the third node passes through the customer service of the first node to the fourth node; after receiving the customer service, the fourth node performs the protection channel to pass through, The customer service of the first node to the fifth node; after receiving the customer service, the fifth node performs protection channel punch-through, and passes through the customer service of the first node to the second node; Receiving the customer service on the protection channel.
  • a network node as an intermediate node in the shared protection ring of the optical channel data unit, includes: an east side protection line unit, configured to receive a pre-transmission signal transmitted on the protection channel before the working channel fails, and corresponding to the west The side protection line unit passes through, and transmits the pre-transmission signal to the west side protection line unit;
  • the west side protection line unit is configured to receive the pre-transmission signal and output.
  • the third node of the intermediate node in the optical channel data unit shared guard ring used in the embodiment of the present invention is triggered by the pre-transmission signal from the first node to perform the punch-through action before the protection channel between the first node and the second node is faulty. After the working channel between the first node and the second node fails, the customer service is directly penetrated, which can speed up the ring protection switching speed.
  • Figure la is a schematic structural diagram of an ODUk shared protection ring provided by the prior art
  • Figure lb is a schematic diagram of a 6-point ring structure of ODUk-SPRing provided by the prior art
  • FIG. 2 is a schematic structural diagram of an NSI signal according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a PM overhead according to an embodiment of the present disclosure
  • FIG. 4 is a structural diagram of a TCM overhead according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a signal transmission method according to Embodiment 1 of the present invention.
  • FIG. 6 is a flowchart of a signal transmission method according to Embodiment 2 of the present invention.
  • FIG. 7 is a flowchart of a signal transmission method according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic diagram of a ring network protection configuration method according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of monitoring by using TCM after the service configuration is completed according to an embodiment of the present invention
  • FIG. 10 is a schematic diagram of monitoring by using TCM after remote switching according to an embodiment of the present invention
  • FIG. 11 is a light provided by Embodiment 4 of the present invention.
  • Channel data unit shared protection ring node structure detailed description
  • An embodiment of the present invention provides an optical channel data unit shared protection ring, including: a first node and a second node as upper and lower client service nodes, and a far path formed by an optical fiber between the first node and the second node a side path, a third node located on the far path, located on the far path, and serving as a fourth node and a fifth node of the upper and lower customer service nodes, the remote path and the proximal path respectively including
  • the protection channel and the working channel wherein the first node may be the node A in the subsequent embodiment, the second node may be the node B in the subsequent embodiment, and the third node may be the node C in the subsequent embodiment, the fourth node It may be node D in the subsequent embodiment, and the fifth node may be node E in the subsequent embodiment.
  • the core idea is: Before the protection channel is faulty, the third node acting as the intermediate node performs the punch-through action after receiving the pre-transmission signal, and passes through the pre-transmission signal to directly bypass the customer service after the protection channel fails.
  • the pre-transmission signal is any signal other than the extra service.
  • the pre-transmission signal may be a Null Signal Indication (NSI) signal or a client service.
  • the NSI signal provided by the embodiment of the present invention may be generated and terminated by the ODUk cross unit or the protection line unit on the protection channel.
  • the OTN frame structure of this signal is shown in Figure 2. All domains (including other overheads) except frame alignment overhead, OTUk overhead, TCMi (Tandem Connection Monitoring) overhead, PM (Path Monitoring) overhead. And the payload can be filled with "0110 0110".
  • RES Reserved
  • ACT Activation
  • FTTL Failure Type Failure Location
  • the FTFL domain may be reserved for the insertion of operation and maintenance information, or may be filled.
  • the operation and maintenance information is used to notify the downstream node of the cause of the upstream failure, and may also notify other operations related to maintenance and maintenance.
  • the specific structure of the PM overhead is shown in Figure 3.
  • the TTI (Trace Trace Identifier) is valid
  • BIP-8 Bit Interleaved Parity
  • BEI Reverse Error Indicator, Backward Error Indication is valid
  • BDI Backward Defect Indication
  • STAT Sttate
  • dEXC error overdue defect
  • dDEG signal degradation defect
  • SNC/N sub-network connection/Non-intrusive monitoring
  • dEXC error overdue defect
  • dDEG signal degradation defect
  • DEG Degraded
  • EXC Excessive
  • CI Characteristic Information
  • SSF Server Signal Fail
  • AIS Alarm Indication Signal 0
  • dDEG signal degradation defects
  • DEGTHR Deterioration Threshold
  • the dTIM is the Defect Trace Identifier Mismatch, which means that the accepted TTI is compared with the expected TTI. If the TTI is consistent, the TIM is not 0. If the DTIM is 0, the inconsistency indicates that there is a TIM. Is 1.
  • the node when the node receives the NSI signal, it compares the accepted TTI in the PM overhead with the expected TTI. If it is inconsistent, there is dTIM, and dTIM is 1. Then, it is determined whether the AcTI is abnormal, that is, whether the accepted TTI is 0110 0110, and if yes, it indicates that the source does not insert a normal TTI, resulting in a protection channel failure. Of course, it can be further determined whether the dOCI is 1, and if it is, it indicates that there is an OCI alarm. For the NSI signal of the present invention, the corresponding dOCI is always 1 , so the judgment step of whether the dOCI is 1 or not is not necessary.
  • TCMi The specific structure of the TCMi overhead is shown in Figure 4.
  • the TTI is required to be valid, BIP-8 is valid, BEIi/BIAEi (Backward Incoming Alignment Error) is valid, BDIi (Backward Defect Indication) Valid, the STAT field is 110.
  • SNC/S sub-network connection/sub-layer monitoring
  • the method for obtaining the cOCI fault according to the TCMi in the NSI signal is as follows:
  • the dTIM is a Defect Trace Identifier Mismatch, which means that the accepted TTI is matched with the expected TTI, and the same indicates that there is no TIM defect. At this time, the dTIM is 0, and the inconsistency indicates that there is a TIM defect. At this time, dTIM is 1.
  • the node when the node receives the NSI signal, it first matches the accepted TTI in the TCM overhead with the expected TTI. If it is inconsistent, there is dTIM, and dTIM is 1. Then, it is determined whether the TTI has been accepted abnormally, that is, whether the AcTI is 0110 0110. If yes, it indicates that the normal TTI is not inserted at the source end, causing the protection channel to be faulty. Of course, it can be further determined whether the dOCI is 1, and if it is, it indicates that there is an OCI alarm. For the NSI signal of the present invention, the corresponding dOCI is always 1 , so the judgment step of whether the dOCI is 1 or not is not necessary.
  • a first embodiment of the present invention provides a signal transmission method.
  • a 6-point ring structure of ODUk-SPRing a node A and a node B, and a service between node C and node D.
  • nodes A, B, C, and D be the upper and lower nodes of the customer service. This method assumes that the service priority between node A and node B is the highest.
  • the node A Before the break between the node A and the node B, the node A generates an NSI signal, and the NSI signal is sequentially terminated in the protection channel through the node C, the node D, the node E, and the node F to the node B, so that the node C and the node are terminated.
  • D. Node E and node F pass through the respective westward protection channel and the eastward protection channel, and transmit the above NSI signal from west to east; node B generates an NSI signal, which sequentially passes through node F and node E on the protection channel.
  • Node D and node C are terminated in node A, so that node F, node E, node D, and node C pass through their respective eastward protection channels and westward protection channels, and transmit NSI signals generated by node B from east to west.
  • nodes A and B need to perform the bridge/selection action. Specifically: the upper client service of the node A is bridged to the protection channel and the working channel, and the customer service sequence passes through the node C, the node D, the node E, the node F to the node B, and the node B selects the client transmitted on the protection channel. business.
  • the upper client service of the node B is bridged to the protection channel and the working channel, and the customer service sequence passes through the node F, the node E, the node D, and the node C to the node A, and the node A selects the client service transmitted on the protection channel.
  • Node D and node E are required to perform the bridge/selection action, and nodes A and B perform the protection channel punch-through action. Specifically, the node D bridges the client service to the protection channel that is far away from the failure, so that the client service of the node D reaches the node E through the nodes C, A, B, and F on the far protection channel, and the node E selects the remote protection.
  • the traffic transmitted on the channel acts as the next customer service of node E.
  • the node E bridges the client service to the protection channel far away from the failure, so that the upper client service of the node E reaches the node D through the node F, B, A, C on the far protection channel, and the node D selects the transmission on the remote protection channel.
  • the business as the node D's under the customer business.
  • the node A bridges the client service to the protection channel and the working channel in two directions
  • the node B bridges the client service to the protection channel and works in two directions.
  • the protection channels connected to the east and west are respectively passed through at nodes C, D, E, and F.
  • Node A and Node B respectively generate and terminate customer services on the far-side and near-side protection channels, specifically: The upper client service of node A passes through nodes C, D, E, and F to node B on the far-side protection channel.
  • node 1 and node B form a 1+1 protection between the proximal protection channel and the far protection channel.
  • node A and B need to perform the selection action. Specifically: For the client service of node A, it is transmitted to the node B through the far-end and near-side protection channels of the node A. The node B only needs to perform the selection action, and selects the service transmitted from the far-side or near-side protection channel. The purpose of the present invention can be achieved. Similarly, for the client service of Node B, it is transmitted to Node A through the far-end and near-side protection channels of Node B. Node A only needs to perform the selection action, and selects the far side or Traffic transmitted on the near side protection channel.
  • Node D and node E are required to perform the bridge/selection action, and nodes A and B perform the protection channel punch-through action. Specifically, the node D bridges the client service to the protection channel that is far away from the failure, so that the client service of the node D reaches the node E through the nodes C, A, B, and F on the far protection channel, and the node E selects the remote protection.
  • the traffic transmitted on the channel acts as the next customer service of node E.
  • the node E bridges the client service to the protection channel far away from the failure, so that the upper client service of the node E reaches the node D through the node F, B, A, C on the far protection channel, and the node D selects the transmission on the remote protection channel.
  • the business as the node D's under the customer business.
  • a second embodiment of the present invention provides a signal transmission method.
  • a 6-point ring structure of ODUk-SPRing a node between node A and node B, and a service between node C and node D, so that node A B, C, and D are the upper and lower nodes of the customer service, and node A is selected as the source and sink node of the pre-transmission signal on the protection channel in the upper and lower nodes of the customer service.
  • the node A Before the break between the node A and the node B, the node A sends and terminates the pre-transmission signal in the two directions of the protection channel, see the dotted line in FIG.
  • the pre-transmitted signal is bidirectionally punched through the full-loop protection channel, so that the protection channels of nodes C, D, E, and F are pre-punched.
  • the node A can bridge the client service to the protection channel in two directions.
  • Node B is required to perform the bridging/selection action, and node A only performs the selection action. Specifically: the upper client service of the node A passes through the nodes C, D, E, and F to the node B, and the node B selects the service transmitted from the protection channel as the lower client service of the node B; the upper client service of the node B passes the F, E, D, C are transmitted to node A, and node A is selected to be uploaded from the protection channel. The business lost is the next customer service of node A.
  • Nodes D and E are required to perform the bridge/selection action, and node A passes the east-west to the connected protection channel.
  • Node D bridges the client service to the protection channel that is far away from the failure.
  • the client service of node D reaches the node E through the nodes C, A, B, and F on the protection channel, and the node E selects the transmission from the protection channel.
  • the service serves as the lower customer service of the node E; in the node E, the client service is bridged to the protection channel far away from the failure, and the upper customer service of the node E passes through the node on the protection channel?
  • B, A, and C arrive at node D, and node D selects the service received from the protection channel as the lower client service of node D.
  • node A serves as a source and sink node of the NSI signal.
  • NCI Null Signal Indication
  • node A When the pre-transmission signal is a Null Signal Indication (NSI) signal, node A serves as a source and sink node of the NSI signal.
  • NCI Null Signal Indication
  • node A When the fiber break between node A and node B requires remote switching: Node B is required to perform the bridging/selection action, and node A performs the bridging/selection action. Specifically, the node A bridges the client service to the protection channel away from the failure, and the upper client service of the node A passes the nodes C, D, E, and F to the node B, and the node B selects the service transmitted from the protection channel as the node B. Under the customer business. Node B bridges the client service to the protection channel that is far away from the failure. Does the client service of Node B pass? , E, D, C are transmitted to node A,
  • the action steps required when the fiber break between the node D and the node E needs to be switched are the same as when the pre-transmission signal is the customer service.
  • a third embodiment of the present invention provides a signal transmission method.
  • a 6-point ring structure of ODUk-SPRing a node between node A and node B, and a service between node C and node D, so that node A B, C, and D are the upper and lower nodes of the customer service.
  • all the upper and lower nodes of the client service generate and terminate the NSI signal on the protection channel.
  • the nodes A, B, D, and E Before the break between the node A and the node B, the nodes A, B, D, and E generate and terminate the NSI signal transmitted on the protection channel, and the node C and the F protection channel bidirectionally pass through the NSI signal.
  • the protection channel on the near side between B and B generates/terminates the customer service
  • the protection channel on the far side between B and B generates/terminates the NSI signal.
  • Node A generates the first NSI signal transmission to Node C on the far path
  • node C performs a protection channel punch-through action, and passes through the first NSI signal to terminate in node D.
  • node D In reverse, node D generates an NSI signal transmission to node C, and node C performs a protection channel punch-through action to punch through the NSI signal to terminate in A.
  • nodes 0, E at 0, The protection channel on the near side between E generates/terminates the customer service, and the protection channel on the far side between 0 and E generates/terminates the NSI signal.
  • Node E generates a second NSI signal to transmit to the node F on the far path.
  • the node F performs a protection channel punch-through action, and passes through the second NSI signal to terminate in the node B.
  • the Node B In the reverse direction, the Node B generates an NSI signal transmission to the node F, and the node F performs a protection channel punch-through action, and passes through the NSI signal to terminate in the node E.
  • Node A and node B are required to perform the bridging/selection action, and nodes D and E pass through the east-west protection channel.
  • Node A bridges the client service to the protection channel that is far away from the failure.
  • the client service of node A reaches the node B through nodes (D, E, and F, and node B selects the service transmitted from the protection channel as node B.
  • the node B bridges the client service to the protection channel far away from the failure, so that the upper client service of the node B reaches the node A through the node F, E, D, C, and the node A selects the transmission channel on the protection channel.
  • the business serves as the underlying customer business of node A.
  • node D and node E are required to perform the bridging/selection action.
  • Nodes A and B pass through the east-west protection channel. The specific analysis is similar to the above. Let me repeat.
  • the switch when the working channel between the node A and the node B is faulty, the switch is switched to the far protection channel between the node A and the node B, and the node C located on the far path is pre-punched;
  • the technical solution provided by the embodiment is also applicable to the near-side protection channel between the node A and the node B when the working channel between the node A and the node B is faulty, assuming that the short path between the node A and the node B is Node C, node C pre-punches the protection channel by transmitting the customer service signal or the NSI signal. Therefore, when performing the near-side switching, it is not necessary to perform the punch-through action during the switching, thereby saving the switching time.
  • FIG. 8 is a schematic diagram of a ring network protection configuration method according to an embodiment of the present invention, which includes the following steps:
  • Step 801 Configure an ODUk-SPRing ring.
  • Step 802 The network management prompts the user to select a monitoring mechanism, and the options include: Sub-network Connection/Inherent Monitoring (SNC/I), SNC/N, SNC/S, assuming that the user selects SNC/S, and further Select TCM6.
  • SNC/I Sub-network Connection/Inherent Monitoring
  • SNC/N Sub-network Connection/Inherent Monitoring
  • SNC/S Service-to-Network Connection/Inherent Monitoring
  • TCM6 Select TCM6.
  • TCM6 work between A and B on the ring
  • the working channel between D and E the protection channel between A and B
  • the protection channel between D and E the protection channel between A and D (via C)
  • the channel (via F) is monitored by TCM6.
  • Step 803 The network management system prompts the user to select a mode for protecting the service configuration of the channel.
  • Step 804 It is assumed that the user selects the concurrent service channel of the highest priority service upper and lower node customer service, and further prompts the user to select one of the highest priority services among all the services configured as the protected wavelength, and assumes that the user selects between A and B. The business has the highest priority.
  • Step 805 Node A generates an NSI signal, and the NSI signal is sequentially terminated in the protection channel through the node C.
  • Node D, the node E, and the node F to the node B, so that the node C, the node D, the node E, and the node F respectively The westward protection channel and the eastward protection channel pass through, and the NSI signal is transmitted from west to east;
  • the node B generates an NSI signal, which sequentially passes through the node F, the throttling node, the node D, the node C, and the node A on the protection channel.
  • the node F, the node E, the node D, and the node C pass through the eastward protection channel and the westward protection channel, and transmit the NSI signal generated by the node B from the east to the west, and the process ends.
  • Step 806 It is assumed that the user selects a single-node client service upper and lower protection channel, and further prompts the user to select:
  • the system automatically specifies the protection channel service upper and lower nodes or the user designation. If the user selects manual designation, the network management provides all the nodes of the upper and lower customer services for the user to select, assuming that the user selects node A; if the system automatically specifies, the system can automatically designate node A as the source and sink node of the pre-transmission signal of the protection channel.
  • Step 807 Node A generates and terminates a pre-transmission signal in two directions of the protection channel, as shown by the dotted line in FIG.
  • the pre-transmitted signal is bidirectionally punched through the full-loop protection channel, so that the protection channels of nodes C, D, E, and F are pre-punched, and the process ends.
  • Step 808 It is assumed that the user selects all the upper and lower protection channels of the client service, and the nodes A, B, D, and E generate and terminate the NSI signals transmitted on the protection channel, and the nodes C and F cross the NSI signals in both directions.
  • FIG. 9 shows a schematic diagram of TCM monitoring after the channel service configuration is completed.
  • the figure assumes that the user selects all customer service upper and lower protection channels.
  • the working channel between A and B, D and E normally transmits and receives the packaged customer service, and the working channel and the near-side protection channel between A and B are monitored by TCM6 level; D, E The working channel and the near-side protection channel are monitored by TCM6 level; the protection channel between A and D (via C) and the protection channel between 0 and F (after E) Use TCM6 level monitoring.
  • node A sends the client service to node C away from the failed segment, because the protection channel of node C is already Pre-punch, so node C transparently transmits the client service of node A to node D.
  • Node D is the node of the upper and lower customer service. According to the APS information, the node D knows that the working channel of A to B is faulty, needs to transmit the upper customer service of A, and punches the east-west protection channel to transparently transmit the customer service of the A node. To node E, the TCM6 overhead is no longer terminated, and TCM6 is transmitted out.
  • the node E knows that the working channel of A to B is faulty according to the APS information, needs to transmit the upper client service of A, and puts the east-west protection channel through, and transmits the client service of the node A to F, and does not end.
  • TCM6 overhead transparent output of TCM6. Since the F node has preset punch-through, the client service of the A node and the TCM6 overhead are directly transmitted to the node B. Node B selects the customer service of the protection channel from the node F remote from the failed zone and terminates the TCM overhead. Refer to Figure 10 for the schematic diagram of TCM monitoring after switching.
  • Embodiment 4 of the present invention provides a network node, including:
  • An NSI signal processing unit configured to obtain a pre-transmission signal and process the obtained pre-transmission signal to obtain a line side signal; wherein, the pre-transmission signal may be an NSI signal;
  • the protection combining unit is configured to multiplex the line side signals, and transmit the multiplexed signals on the protection channel.
  • the NSI signal processing unit includes: a cross unit for generating an NSI signal; and a protection line unit for adapting the NSI signal to a line side OCh signal.
  • the cross unit may be an ODUk cross unit;
  • the NSI signal processing unit is a protection line unit for generating an NSI signal
  • the NSI signal is adapted to the line side OCh signal.
  • the following ring protection is configured as a four-fiber ring, in which multiple protection groups are configured, such as one, ⁇ > 1, and west to I to one line unit pair (I and ⁇ are a pair, ⁇ and ⁇ , for a pair, where I 'and M' are protection line units, I and ⁇ are working line units), eastbound corresponding to one line list
  • the pair of elements N and N' are a pair, and O and O' are a pair, wherein N' and O' are protection circuit units, and N and O are working line units).
  • the tributary unit performs the adaptation function between the customer service signal and the ODUk signal, that is, adapts the customer service signal to the ODUk signal, and can also inversely adapt the ODUk signal to the customer service signal;
  • the ODUk cross unit can complete the cross-connect function of the ODUk signal, and can send the ODUk signal sent by any line unit or any branch unit to any line unit or any branch unit.
  • the line unit completes the adaptation function between the ODUk signal and the OCh signal, and can adapt the ODUk signal on the ODUk cross unit side to the line side OCh signal, or reversely convert the ODUk signal from the line side OCh signal. Give the ODUk cross unit.
  • the multiplex unit through the OMS and OTS segment layer processing, multiplexes the OCh signal with other wavelength signals into an Optical Transport Module ( ⁇ ) signal for transmission in the line side fiber.
  • ⁇ Optical Transport Module
  • the network node provided by the embodiment of the present invention is the node A.
  • the NSI signal is generated by the ODUk cross-unit of the node A and transmitted to the protection line unit.
  • the NSI signal can also be generated by the protection line unit, and the NSI signal is adapted.
  • the OCh signal is sent to the multiplex unit.
  • the protection channel carries the customer service.
  • the ODUk cross-unit of node A directly crosses the ODUk signal obtained by its own branch unit to the protection line unit, and the protection line unit receives the ODUk signal and then adapts.
  • the OCh signal is transmitted to the multiplex unit.
  • the fifth embodiment of the present invention provides a network node, which is an intermediate node in the shared protection ring of the optical channel data unit, and includes:
  • the east side protection line unit is configured to: after receiving the pre-transmission signal transmitted on the protection channel, pass through with the corresponding west side protection line unit, and transmit the pre-transmission signal to the west side protection line unit; a protection line unit, configured to receive the pre-transmission signal and output.
  • a BER calculation unit configured to calculate a bit error rate BER based on a Poisson distribution according to a pre-transmission signal transmitted on the protection channel or a BIP of the signal in the working channel;
  • a defect determining unit configured to determine whether the BER is greater than a threshold of an error excess EXC, if Yes, the error overdue defect dEXC is reported, and if not, it is determined whether the BER is greater than the threshold of the signal degradation DEG, and if so, the signal degradation defect dDEG is reported.
  • Embodiment 6 of the present invention provides an optical channel data unit shared protection ring, including: a first node and a second node that are upper and lower client service nodes, and a far path formed by an optical fiber between the first node and the second node, and a proximal path, a third node on the distal path, where
  • the first node is configured to obtain a pre-transmission signal and output to the third node through the protection channel before the working channel failure between the first node and the second node, and work between the first node and the second node After the channel is faulty, the client service of the first node is bridged to the protection channel and transmitted to the third node; the third node is configured to perform the protection channel punch-through after the pre-transmission signal is received, and the pre-transmission is performed through the pre-transmission Transmitting the signal to the second node, after the working channel between the first node and the second node is faulty, penetrating the client service of the first node to the second node on the bypassed protection channel;
  • the second node is configured to select, after the fault of the working channel between the first node and the second node, the customer service of the first node on the protection channel.
  • the pre-transmission signal is: the null signal indicates an NSI signal or a client service of the first node.
  • the NSI signal when the pre-transmitted signal is an NSI signal, the NSI signal includes a path trace identifier TTI; the node B is further configured to determine, according to the TTI in the NSI signal, whether there is a trace identifier mismatch TIM If there is a TIM, it is judged whether the TTI is abnormal. If the TTI is abnormal, the protection channel between the node A and the node B is faulty.
  • the optical channel data unit shared protection ring further includes: a fourth node and a fifth node that are located on the far path and serve as upper and lower client service nodes, where the third node is located between the first node and the fourth node When the service priority between the first node and the second node is the highest, and before the working channel fails,
  • the third node is configured to: after receiving the pre-transmission signal, perform protection channel punch-through, and pass the pre-transmission signal to the fourth node;
  • the fourth node is configured to perform a protection channel punch-through after the pre-transmission signal is received, and pass the pre-transmission signal to the fifth node;
  • the fifth node is configured to perform a protection channel punch-through after the pre-transmission signal is received, and pass the pre-transmission signal to the second node.
  • the fourth node is further configured to bridge the client service of the fourth node to the protection channel and transmit to the third node; Passing through the client service of the fourth node to the first node; the first node is further configured to: after receiving the client service of the fourth node, performing protection channel punch-through, penetrating the fourth node
  • the customer service to the second node; the second node is further configured to: after receiving the customer service of the fourth node, perform protection channel punch-through, and pass through the customer service of the fourth node to the fifth node;
  • the fifth node is configured to select a customer service of the fourth node on the protection channel.
  • the seventh embodiment of the present invention provides an optical channel data unit shared protection ring, including: a first node and a second node as upper and lower client service nodes, and a far path formed by an optical fiber between the first node and the second node a third path, located on the far path, on the far path, and as a fourth node and a fifth node of the upper and lower customer service nodes, where
  • the first node is configured to generate a first NSI signal and output to the third node through the protection channel before the working channel failure between the first node and the second node, between the first node and the second node After the working channel is faulty, the customer service of the first node is bridged to the protection channel and transmitted to the third node; the third node is configured to perform the protection channel through, after the first NSI signal is received, The first NSI signal is terminated in the fourth node, and after the working channel between the first node and the second node is faulty, the customer service of the first node is punched through to the fourth node;
  • the fourth node is configured to transmit its own client service to the fifth node on the protection channel before the working channel failure between the first node and the second node, and the working channel between the first node and the second node is faulty After the protection channel is punched through, the customer service of the first node is punched through to the fifth node;
  • the fifth node is configured to generate a second NSI signal and output the protection to the second node through the protection channel before the working channel failure between the first node and the second node, where the first node and the second node are After the working channel fails, the protection channel is punched through, and the customer service of the first node is punched through to the second node;
  • the second node is configured to select, after the fault of the working channel between the first node and the second node, the customer service of the first node on the protection channel.
  • the first NSI signal includes a TTI
  • the fourth node is further configured to determine whether a TIM exists according to the TTI in the first NSI signal, and if there is a TIM, determine whether the TTI is abnormal, and if the TTI is abnormal, report the first section.
  • the protection channel between the point and the fourth node is faulty;
  • the second NSI signal includes a TTI
  • the second node is further configured to determine, according to the TTI in the second NSI signal, whether a TIM exists, and if there is a TIM, determine whether the TTI is abnormal, and if the TTI is abnormal, report the fifth node to the second node. Protection channel failure.
  • the optical node data unit used in the embodiment of the present invention shares the intermediate node in the protection ring.
  • the third node is triggered by the pre-transmission signal from the first node before the protection channel between the first node and the second node is faulty. After the working channel between the first node and the second node is faulty, the customer service is directly punched through, which can speed up the ringing protection switching speed.
  • the NSI signal in the embodiment of the present invention includes a TTI, and the node that terminates the NSI signal determines whether there is a trace identifier mismatch TIM according to the TTI in the NSI signal. If there is a TIM, it is determined whether the TTI is abnormal. If the TTI is abnormal, Then, the protection channel of the NSI signal is faulty. Therefore, if the NSI signal is transmitted on the protection channel, the protection channel can be detected at any time.
  • the existing OTN only supports the error burst distribution, and within a certain error rate range, the defect detection time based on the error Poisson distribution is faster than the defect detection time based on the error burst distribution, and the implementation of the present invention
  • the OTN network provided by the example supports defect monitoring based on error Poisson distribution, which enables faster protection switching time in certain scenarios.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention concerne un anneau de protection de partage d'une cellule de données d'un canal optique qui comprend le premier nœud, le deuxième nœud et le troisième nœud. Le premier nœud permet d'obtenir un signal de pré-transmission et transmet le signal de pré-transmission au troisième nœud par un canal de protection avant qu'une défaillance ne survienne dans une voie de travail entre le premier et le deuxième nœud, en connectant par un pont le service client du premier nœud au canal de protection et en transmettant le service client au troisième nœud après que la défaillance soit intervenue sur la voie de travail entre le premier et le deuxième nœud ; le troisième nœud sert à exécuter le passage du canal de protection après la réception du signal de pré-transmission et le passage du signal de pré-transmission au deuxième nœud, le passage du service client du premier nœud au deuxième nœud par l'intermédiaire du canal de protection passé une fois que la défaillance est survenue sur la voie de travail entre le premier et le deuxième nœud ; le deuxième nœud est utilisé pour recevoir de manière sélective le service client du premier nœud qui se trouve sur le canal de protection après que la défaillance est survenue sur la voie de travail entre le premier et le deuxième nœud.
PCT/CN2008/073776 2007-12-27 2008-12-26 Anneau de protection de partage d'une cellule de données de canal optique, procédé de transmission du signal et nœud de réseau WO2009082970A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200710307027 2007-12-27
CN200710307027.5 2007-12-27
CN200810095027.8 2008-04-23
CN2008100950278A CN101471837B (zh) 2007-12-27 2008-04-23 光信道数据单元共享保护环、信号传输方法及网络节点

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WO2009082970A1 true WO2009082970A1 (fr) 2009-07-09

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PCT/CN2008/073776 WO2009082970A1 (fr) 2007-12-27 2008-12-26 Anneau de protection de partage d'une cellule de données de canal optique, procédé de transmission du signal et nœud de réseau

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1424827A (zh) * 2003-01-09 2003-06-18 上海交通大学 自动光交换网中的双向通道恢复方法
CN1479455A (zh) * 2002-08-29 2004-03-03 华为技术有限公司 弹性分组环网的快速倒换方法
CN101094036A (zh) * 2006-06-23 2007-12-26 赵季红 一种通道保护环的自愈机制

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1479455A (zh) * 2002-08-29 2004-03-03 华为技术有限公司 弹性分组环网的快速倒换方法
CN1424827A (zh) * 2003-01-09 2003-06-18 上海交通大学 自动光交换网中的双向通道恢复方法
CN101094036A (zh) * 2006-06-23 2007-12-26 赵季红 一种通道保护环的自愈机制

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