WO2007006175A1 - Procede de mise en oeuvre de la prevention des defaillances facile prise en charge par la protection annulaire partagee des canaux - Google Patents

Procede de mise en oeuvre de la prevention des defaillances facile prise en charge par la protection annulaire partagee des canaux Download PDF

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Publication number
WO2007006175A1
WO2007006175A1 PCT/CN2005/001016 CN2005001016W WO2007006175A1 WO 2007006175 A1 WO2007006175 A1 WO 2007006175A1 CN 2005001016 W CN2005001016 W CN 2005001016W WO 2007006175 A1 WO2007006175 A1 WO 2007006175A1
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Prior art keywords
node
channel
service
protection
state
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PCT/CN2005/001016
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English (en)
Chinese (zh)
Inventor
Zhenyu Wang
Xiaoqiang Wei
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Zte Corporation
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Priority to PCT/CN2005/001016 priority Critical patent/WO2007006175A1/fr
Publication of WO2007006175A1 publication Critical patent/WO2007006175A1/fr

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    • 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
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • 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
    • H04J14/0289—Optical multiplex section protection
    • H04J14/0291—Shared protection at the optical multiplex section (1:1, n:m)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation

Definitions

  • the invention relates to an implementation technology of channel sharing ring protection in an optical fiber transmission network, in particular to a technology for implementing protection switching and error correction of channel sharing ring protection in a ring optical transmission network using wavelength division multiplexing technology.
  • the ring network structure has been widely recognized by the industry for its good self-healing capability.
  • the type of ring network protection has been continuously enriched and improved, and it has been more and more widely used in practical engineering.
  • Ring network protection technology is one of the important components of APS (Automatic Protection Switching) technology. Its implementation method and technology are also in the process of continuous development.
  • the International Telecommunication Union Telecommunication Standardization Sector has issued a series of standard recommendations for optical network protection technologies: G. No. 841, "Types and Characteristics of SDH Network Protection Architecture" is mainly for SDH light.
  • the network's automatic protection switching technology has made specific recommendations.
  • the protection of the ring network only covers the implementation of the multiplex section shared ring protection switching and error-blocking technology, but does not include the channel shared ring protection commonly used in current optical networks. Technical content. G. 808. Recommendation No. 2
  • the ring network protection principle is proposed, but the principle of the protection switching technology basically follows the provisions of Recommendation G. 841.
  • the implementation scheme of the channel shared ring protection mode proposed by the present invention has the advantages of flexible service switching and high network resource utilization rate.
  • the channel shared ring protection switching in the optical network if the socket uses the principle of multiplex section shared ring protection in the G. 841 protocol, the channel shared ring protection cannot be effectively implemented.
  • the main reason is: multiplex section shared ring
  • the principle of the protection protocol processing is to perform double-end switching on the adjacent nodes at both ends of the fault to form a new loop.
  • the protection granularity can directly correspond to the service, it can be The upstream node and the downstream node of the service directly perform double-ended switching to form a new loop, which avoids forming a long overlapping loopback loop like the multiplex section ring protection.
  • the business of fault protection for ring network protection most of the industry is based on the existing industry standards, first to determine the situation where the service may be connected in error, and then to implement the business error correction processing by shutting down the service device of the service.
  • the method is a feasible method for the ring network sharing protection (including the two-fiber unidirectional/bidirectional ring sharing protection/four-fiber bidirectional ring sharing protection, etc.), but for the channel-wide ring sharing protection application. In this way, the error-resistance processing method of shutting down the service sender device is not an optimal implementation technique.
  • the service error prevention technology can only be implemented based on the result of the switching operation, for example, as shown in FIG. 2, when the ring network spans When there is a fault in both the 3 and the span 5, the service T1 in the CD direction on the faulty node C is switched to the protection path in the CB direction, and the node F is affected by the span 5 fault.
  • the service T2. is switched to receive the signal from the protection path in the GF direction. Therefore, due to the principle of sharing the protection channel, the signal sent by the service T1 is misconnected to the service ⁇ 2, and the transmission terminal of the service T1 needs to be turned off. 'Prepare to suppress the wrong connection situation.
  • This kind of error prevention method involves opening/closing the service sending equipment. There are also potential risks when the processing is complicated.
  • the service protection processing can be implemented in the same way as the shared-ring protection type of the multiplex section.
  • the channel-sharing protection can directly implement the switching of the protected service on the switching principle. While having the characteristics of sharing protection resources, the invention also has the feature of achieving high efficiency switching based on the business up and down situation, and accordingly, the present invention proposes a method for implementing the business error correction processing more easily.
  • the technical problem to be solved by the present invention is to provide a method for implementing channel sharing ring protection that supports simple error rectification, and solves the problem of overlapping loopback loop formed by double-end switching of adjacent nodes at both ends of a fault span. technical problem.
  • Another technical problem to be solved by the present invention is to provide an implementation method of a channel shared ring protection that supports simple error prevention, which is characterized in that, in a ring network, a fault occurs across a working path.
  • the service directly performs double-end switching on the uplink node and the downlink node of the service working path to form a protection path avoiding the fault span.
  • the above method is characterized in that, for the service path and the protection path in the ring network, there is a fault spanning service, and the channel protection state of the upper and lower road nodes of the service is changed to the channel idle state, thereby canceling the previous possibility.
  • the switching operation that occurs can avoid the situation of causing business misconnection without shutting down the service sending device, and realizes simple error prevention.
  • the automatic protection switching module that supports the channel sharing ring protection switching is downloaded to the automatic protection switching control board of each node in the ring network; in the switching module, corresponding to the ITU-T G.841 protocol
  • the specified three states of the idle state, the through state, and the reverse state are introduced into the channel switching state, the channel through state, and the channel idle state.
  • the channel switching state corresponds to the local need to protect the service signal in the work switching and protection.
  • the channel through state corresponds to an operation of connecting the local protection channel
  • the channel idle state corresponds to the normal operation of the local service signal by the working channel;
  • the protection group information is downloaded and stored in the local database of the control board.
  • Step 3 In the case where there is no fault span, the node status of each node is idle. After the fault span occurs, according to the processing principle of the APS protocol, the automatic protection switching signaling passes between the ring nodes. After the response is stabilized, the node states of the adjacent nodes on the fault span are in a reverse state, and the switch direction is the adjacent side of the fault span, and the node states of the other nodes are the through state.
  • Step 4 According to the node status and the received APS signaling, combined with the protection group information, determine whether the protected service is affected by the fault span, thereby further determining the channel protection status of each node: the service affected by the fault
  • the channel protection state of the upper and lower nodes is the channel reversal state, and the switching operation of the adjacent side of the working path is performed;
  • the channel protection state of the node on the protection path of the service affected by the failure is the channel through state, and the protection channel is required to be punched through. Operation;
  • the channel protection state of the adjacent nodes of the fault span is the channel idle state;
  • the channel protection state of the remaining nodes is the channel through state, and the protection channel punch-through operation needs to be performed;
  • Step 5 On the basis of the previous single-span fault, for each additional fault span, it is necessary to re-observe the node protection state after each node protocol response is stable according to the APS protocol;
  • Step 6 after obtaining the state of the node in the case of multi-span failure, according to the state of the node and the For the protection group information, the uplink and downlink services of each node of the network need to be processed as follows: For the service where the working path and the protection path are faulty at the same time, the channel switching state of the service node and the downlink node should be the channel. In the idle state, the switching operation that may have occurred before is cancelled. For the service that only has a fault in the working path, the channel switching state of the service node and the downstream node should be the channel switching state, and the switching operation of the adjacent side of the working path is performed. The node on the service protection path is in the channel pass-through state. For the service where only the protection path is faulty, that is, the service path is not faulty, the channel switching state of the service on the upper and lower nodes should remain in the original state, and no need to be performed. New switching operation.
  • the determining whether the service of each node is affected by the fault includes: for the node in the through state, according to the service configuration type, and determining the service on the node by the node Is the downstream node in the counterclockwise direction farther than the source node from the clockwise direction signaling, and whether the upstream node of the service at the local node is in the counterclockwise direction is closer to the counterclockwise direction signaling The way the source node is to determine if the node's service is affected by the failure.
  • the determining whether the service of each node is affected by the fault includes: for the node in the reverse state, according to the switching direction of the node and the type of the service Determine the channel protection status of the node.
  • the above method is characterized in that, after the fault section is repaired, the node state is changed from the through state 3 ⁇ 4 ⁇ switching state to the idle state, and the channel protection state of the node is also changed to the channel idle state.
  • the protection group information includes: a self-attribute of setting a protection configuration in the network, physical address information related to the monitor and the executor, network topology information, and a related node Protected business configuration information.
  • the self-attribute includes: a return mode, a wait recovery time, a fault-blocking enable state, and a signal degradation protection defined in the ITU-T standard; : Service configuration type, on-route node, and drop-down node.
  • the present invention provides a method for implementing channel sharing ring protection that supports simple error rectification.
  • the channel sharing ring protection directly corresponds to the service in the protection granularity, and the double-ended switching directly forms a new ring in the service node and the downstream node of the service.
  • the road is no longer the same as the multiplex section ring protection.
  • the two-end switchover is performed on the adjacent nodes at both ends of the fault. This avoids the formation of a long overlapping loopback loop.
  • the channel shared loop protection is more flexible and economical.
  • FIG. 1 is a schematic diagram of a protection principle of a shared loop protection of a two-fiber multiplex section and a shared loop protection of a two-fiber channel when a D-E span fails in a ring network;
  • FIG. 2 is a schematic diagram of a service misconnection situation caused by ring network shared protection switching in the case where both C-D and E-F are in the same fault condition in the prior art;
  • FIG. 3 is a schematic diagram of a two-fiber channel shared ring protection transmission system
  • Figure 4 is a flow chart of node APS processing
  • Figure 5a is a schematic diagram of the operation of the uplink service
  • Figure 5b is a schematic diagram of the operation of the downlink service
  • Figure 5c is a schematic diagram of the operation of the upper and lower roads
  • Figure 5d is a schematic diagram of the operation of the through service
  • Figure 6 is a flow chart of the channel protection process with the node status PASS;
  • Figures 7a-7g are schematic diagrams of different protection scenarios for channel sharing rings
  • Figure 8 is a flow chart of the channel protection process with the node status SWITCH; ⁇ . . . , :::
  • Figure 9 is a schematic diagram of the protection of the two-fiber channel shared ring when the C-D span is faulty in the ring network.
  • Figure 10 shows the protection of the two-fiber channel shared ring when the C-D span and the E-F span are faulty in the ring network;
  • Figure 11 is a schematic diagram of protection of two-fiber channel shared ring when there is a fault in the C-D span, E-F span, and H-A span in the ring network. The best way to achieve the invention
  • the present invention is a technique for implementing protection switching and squelching/prevent misconnections of a channel shared ring protection in a ring optical transmission network using Wave Division Multiplexing (WDM) technology.
  • WDM Wave Division Multiplexing
  • the invention provides an implementation method of channel sharing ring protection for supporting simple error rectification in an optical network, which mainly includes two aspects: Firstly, a protection switching implementation method for performing switching according to the channel service of the channel service is proposed; secondly, The invention is implemented by adopting a new channel sharing ring protection protection In the current method, the switching operation in the case where the service may be misconnected is appropriately adjusted, and the service error-correcting processing can be realized without shutting down the service transmitting device without affecting the protection function, which can effectively eliminate the error-inducing service. The potential risk of sending device switching operations.
  • the process of the channel shared ring protection method for supporting simple error rectification adopted by the present invention is:
  • the APS software that supports the channel shared ring protection switching is downloaded to the APS control board of each node to which the ring optical network belongs.
  • three channel protection states are introduced based on the three states of the idle state (IDLE), the through state (PASS), and the reverse state (SWITCH) in the ITU-T protocol: Channel switching states ( CSWITCH), channel pass-through state (CPASS) and channel idle state (CIDLE).
  • the channel switching state corresponds to the switching operation between the service switching and the protection channel, and the channel direct state corresponds to the operation of connecting the local protection channel;
  • the channel idle state corresponds to the local service signal being normally up and down by the working channel. operating.
  • the channel protection status is further derived from the local service configuration and network topology information based on the node status.
  • the protection group configuration of the channel sharing ring protection type is performed through the network management.
  • the protection group information is downloaded as protection configuration information and stored in the database of the APS control board.
  • the meaning of the protection group refers to the self-attribute of a certain protection configuration in the network (return mode, waiting for recovery (WTR) time, error-blocking enable state, signal degradation protection, etc. defined in the ITU-T standard), Logic related to the physical address information of the monitor and the executor, the network topology information, and the protected service configuration information (including the service configuration type (Operation), the add-on node (AddNode), and the drop node (DropNode)) set.
  • the state of each node in the ring network is idle.
  • a certain span M fails (for a signal failure situation detected by the service receiving device, it can be attributed to a fault in the service working path adjacent to the service downlink node), according to the processing principle of the APS protocol, the APS letter
  • the node obtains a new state value: the nodes on the adjacent sides of the fault span are in a reverse state, and the other loop nodes are in a through state.
  • the nodes adjacent to both ends of the segment 3 the node state of D is the reverse state, and the node state of the other nodes is the through state.
  • the implementation process of the APS protocol is mainly implemented by the response process of the APS signaling.
  • the communication mode of the APS signaling may include multiple (such as byte stream mode and IP packet mode), and the following is defined in the TU-T standard.
  • the K1/K2 byte mode is described as an example. After an APS signaling response process reaches a steady state, the K bytes received by each node will not change. At this time, the received K byte must be from the current node. The most recent fault is sent across the adjacent nodes.
  • the definition of K bytes according to the ITU-T standard shown in Table 1 and Table 2 (the format of IP packet signaling can be more flexible than K bytes, but should include K bytes.
  • the identifier of the K-byte source node can be extracted in the ⁇ byte, so that the position of the fault span in the ring network can be obtained according to the K byte.
  • the APS protocol is triggered by the fault of the segment 4.
  • the source node of the K-byte counterclockwise direction received by the node A is E, and the received outer ring direction K word.
  • the source node of the section is D.
  • APS request command code (1 to 4 digits) Destination address ID (5-8 digits) 2-byte structure definition: Source address ID (1-4 digits) (6-bit) APS status (6-8 bits)
  • node status and ring network service configuration information service uplink and downlink nodes, ring network topology, etc.
  • the protection status of the upper and lower nodes of the service affected by the fault is the channel reversal state, affected by the node on the service protection path is the channel through state, and the other nodes are the channel idle state, and according to this ⁇
  • the state value determines the corresponding protection switching action.
  • the channel protection protection state of the upper and lower nodes C, E of the service T1 changes to the pass:: the channel reversal state, the service T1 protection path
  • the channel protection state of the node (B, A, H, G, F) is the channel pass-through state
  • the channel protection state of the intermediate node D on the service T1 working path is the channel idle state.
  • the present invention identifies the current normal working path and the protection path of the current service by combining the local service configuration and the network topology information with the APS protocol processing process between the network nodes.
  • the reverse state of the upstream and downstream nodes of the original service is immediately updated to the idle state, so that the misconnected service may be switched back to the original normal working path, thus eliminating the business misconnection phenomenon. It will not affect the protection function of the network. And according to the state value, the corresponding protection switching action is determined.
  • the final channel protection status should be based on the judgment of the affected service. If the uplink service and the downlink service are affected at the same time, the channel protection status of the node should obviously be the channel. Idle state.
  • the channel protection status of the upper and lower nodes corresponding to the service should be determined as follows: for all the services affected by the faults of the M, N, and Q faults in the network are determined as follows: If the working path and the protection path of the service are both faulty, the channel protection status of the upper and lower nodes corresponding to the service should be If the working path is faulty, the protection status of the upper and lower nodes of the service affected by the fault is the channel reversal state, and the nodes on the affected service protection path are channel pass-through state, and other nodes are channel idle state; If only the protection path is faulty, the node channel status should remain the same. Based on this status value, the corresponding protection switching action is determined.
  • the final channel protection status should be based on the judgment of the affected service. If the on-line service and the off-line service are affected by the elbow, The channel protection state of the node should obviously be the channel idle state. ⁇
  • the present invention is a method for implementing channel sharing ring protection in a ring optical network that supports simple error rectification.
  • the important feature is that the channel sharing ring protection directly corresponds to the service in the protection granularity, and is directly at the service node and the downstream node of the service. Double-end switching is performed to form a new loop. The double-ended switching between adjacent nodes at both ends of the fault is not used in the same way as the multiplex section ring protection. This avoids the formation of a long overlapping roundabout loop and channel sharing.
  • the implementation of the ring protection is more flexible and economical.
  • the network protection capability can be adjusted by adjusting the switched node to the idle state for the service fault-correction processing in the case of network double-span and multi-span faults. On a constant basis, it realizes the function of easily blocking faults without shutting down the service sending device.
  • Figure 3 depicts an example of a simple optical network transmission network structure.
  • Each light includes multiple channels, and each channel can carry one path.
  • Service signal; node corresponds to the station.
  • the optical signal is transmitted in the opposite direction.
  • a two-fiber unidirectional/bidirectional multiplex section shared ring protection can be supported, or multiple two-fiber unidirectional/bidirectional channel shared ring protection type protection configurations can be simultaneously supported.
  • the outer ring can also be completely peer-to-peer for service configuration, but the protection switching principle is basically the same.
  • Figure 4 depicts the basic flow of the APS process of the present invention. The figure includes the following steps:
  • Step 401 the system starts, and the network management configures APS data information.
  • Step 402 A node APS controller receives a network management command/detection board detects a fault/receives new APS signaling;
  • Step 403 generating and outputting APS signaling, respectively, to the two ends of the ring, until the system APS signaling response is stable, and obtaining a new node state;
  • Step 404 Determine, according to the node status and the protection service information, the channel protection status according to the service protection and the error protection requirement, and further determine the protection switching action.
  • Step 405 Send a protection switching action command to the APS execution board, and return to step 402.
  • the APS process is as follows: First, the APS software is downloaded to the APS control board. After the power is turned on, the APS configuration data information is sent through the network management system. When a certain span occurs, the APS detection board of the downstream adjacent node of the span: detects the fault, and the fault information is sent to the APS control board to start a new APS process.
  • the APS control board can also initiate a new APS process by receiving the manually issued network management command.
  • the node receives the new APS signaling, indicating that a new APS process has been initiated by other nodes in the ring. The beginning of the node APS process.
  • the APS control board processes the new APS signaling according to the protocol, and then sends the new APS signaling to the peer node through the long and short paths of the ring, so that the nodes in the entire ring perform repeated APS letters. Let the response stabilize.
  • the node After processing each APS signaling change, the node will first determine the new node status, and then further process according to the node status and protection service information to determine the channel protection status, and then determine the switching action and send it to the APS for execution. veneer. At this point, a complete APS process is completed and the system returns to wait for the next APS process.
  • the main means for the APS to effectively process the channel sharing ring is to protect the service information and the network topology information, and the service information mainly includes the configuration type (operation) and the uplink node (AddNode). ), the down node (DropNode).
  • the service information mainly includes the configuration type (operation) and the uplink node (AddNode). ), the down node (DropNode).
  • the service configuration type of the node it is determined that a certain direction of the ring (clockwise or counterclockwise) is used as the reference direction.
  • the counterclockwise direction is used as the reference direction, and the distance between the two nodes to be used later with respect to the current node is also based on the counterclockwise direction.
  • the on-going node referred to here refers to the on-going node of the current node's downlink service; the downlink node refers to the downstream node of the current node's on-off service.
  • the definition of the protection service configuration type will be described below with reference to Figures 5a, 5b, 5c, and 5d.
  • the next node is (:, the node on the road is B.
  • the service on the working channel in the counterclockwise direction is from the node A and the node B, and there is an intermediate node in the middle, and the node B is in the middle.
  • the configuration type of the B node is defined as "downward” or "drop”; the upper node is A, and the lower node is B.
  • the counter-clockwise working channel of the node B is If there is a service under the road and there is another service on the road, the configuration type of the B node is defined as "up and down" or "
  • the service information mentioned here is not specific to one service, but is a comprehensive information of services for the working channel of the ring.
  • the node status of each node on the ring is determined: In the case of a fault, the status of the adjacent node of the fault span is SWITCH (the direction of the switch is the direction of the adjacent side of the fault span), and the fault span The status of the nodes that are not adjacent to the segment is PASS. However, when the node is isolated, that is, the nodes on both sides of the node fail at the same time, the state of the node is IDLE; the node state when the system recovers after the fault is repaired is IDLE.
  • the node protection status of the node can be finally determined by the node status of the current node, the service information of the working channel, the information of the APS signaling source node, and the node sequence information of the ring network. Further, wherein the node state is divided into three cases. (1) The process of node status is PASS
  • the node C is the current node.
  • the service is on the way from the current node C, and the node F is on the way; the source node of the APS signaling from the outer ring direction received by the node C is the node D.
  • the channel protection state is set to the channel switching state (CSWITCH);
  • the right channel switch is switched.
  • the service is from the current node C, and the node D is on the way; the source node of the APS signaling from the outer ring direction received by the node C is the node D.
  • the channel protection state is set to the channel pass state (CPASS). ; No switch switching is required.
  • the node F is the current node.
  • the service is on the node C, and the current node F is on the way; the source node of the APS signaling from the counterclockwise direction received by the node F is the node E.
  • the channel protection status is set to the channel switching state (CSWITCH); On the left side of the current node (in the direction of the service), the left channel switch is switched.
  • the service is from the node E, and the current node F is on the way; the source node of the APS signaling from the counterclockwise direction received by the node F is the node E.
  • the channel protection state is set to the channel pass state (CPASS); No switch switching is required.
  • the corresponding processing can be decomposed into two sub-processes with the service configuration types of Add and Drop respectively. After processing the two sub-processes according to the above method, the two results are merged. , you can get the channel protection status and switching action.
  • CPASS performs protection channel punch-through operation.
  • the node status of the adjacent node E on the right side of the fault span 4 should be SWITCH, and the node switching direction is left.
  • the service configuration type of the E node is Add. Since no service is affected by the fault spanning, the channel protection status should be CIDLE and there is no switching action.
  • the node status of the adjacent node E on the right side of the fault span 4 should be SWITCH, and the node switching direction is left.
  • the service configuration type of the E-node is Drop. Since the service is bound to be affected by the fault span, the channel protection status should be CSWITCH.
  • the fault span is located on the left side of the current node (in the service direction). Switched.
  • the node status of the adjacent node E on the right side of the fault span 4 should be SWITCH, and the direction of node switching is left.
  • the service configuration type of the E-Node is Pass. Because the channel shared ring sharing protection of the present invention is only performed on the service uplink and downlink nodes, the channel protection status is CIDLE, and channel switch switching is not required. Also, since the service switching does not pass through the protection channel of the D node, there is no need to protect the channel through. Therefore, the D node does not need channel switch switching.
  • the node status of the adjacent node D on the left side of the fault span 4 should be SWITCH, and the node switching direction is right.
  • the service configuration type of the D node is Add. Because the service is in any way, it will be affected by the fault span. Therefore, the channel protection status should be CSWITCH, because the fault span is located on the right side of the current node. Direction), the right channel switch is switched.
  • the node status of the adjacent node D on the left side of the fault span 4 should be SWITCH, and the node switching direction is right.
  • the service configuration type of the D node is Drop. Since no service is affected by the fault spanning, the channel protection status should be CIDLE and there is no switching action.
  • the configuration type of the node D is AddDrop, combined with the above (25), (26) analysis, the downlink service of the node will not be affected by the fault, and the traffic on the node will inevitably be affected by the fault, so the processing conclusion is the same as (25):
  • the channel protection state should be CSWITCH, due to The fault span is located on the right side of the current node (in the service direction), and the right channel switch is switched.
  • the node status of the adjacent node D on the left side of the fault span 4 should be SWITCH, and the node switching direction is right.
  • the service configuration type of the D-node is Pass. Because the channel shared ring sharing protection of the present invention is only performed on the service uplink and downlink node, and the adjacent nodes of the fault span do not need to be punched through, the channel protection state is CIDLE, and channel switch switching is not required. Also, since the service switching does not pass through the protection channel of the E node, the E node does not need PASS.
  • the node status of the adjacent node E on the right side of the fault span 4 should be SWITCH, and the node switching direction is left.
  • the service configuration type of the E-node is Null. Because the channel shared ring sharing protection of the present invention is only performed on the service access node, and the adjacent nodes of the fault span do not need to be punched through, the channel protection status is CIDLE, and no channel switch switching is required.
  • node status PASS or SWITCH it is the protection process after the network detects the fault. After the fault repaired service, the reply from the protection path to the working channel is the necessary content of the APS. The network detects that the fault disappears, and then the entire APS. The system responds by signaling, and the stable node shape: the state will be from the original PASS or SWITCH. Go back to the IDLE state.
  • the determination of the state of the node to the IDLE is relatively simple, and no special judgment is required: the channel protection state is CIDLE, and the channel switch state is non-switching state.
  • the channel sharing protection switching operation can be determined, and the APS control board sends the switching command to the APS execution board to perform the corresponding APS switching operation.
  • FIG. 9 is a schematic diagram of the protection principle of the two-fiber channel shared ring protection when the CD span in the ring network is faulty.
  • the faulty neighboring nodes C and D respectively detect the fault, and initiate APS signaling to the respective peer node respectively.
  • each node of the network Analyze the received signaling content separately, and combine the locally stored network topology information to obtain a single span of the fault (span 3), and then combine the local service configuration information to determine whether the local uplink/download service crosses the fault.
  • Segment if the local up/down traffic is affected by the fault, execute the phase
  • the switching operation should be reversed; otherwise, the through state is maintained; for the node that is not configured to be up/down in the local state, no operation is required and remains in the idle state.
  • the upper and lower nodes C and E of the service T1 are changed from the original idle state to the switched state (the C node is the right switchover and the E node is the left switchover), and the service T1 is switched from the normal pass channel to the protection. channel. Since the service T2 is not affected by the fault, no corresponding switching operation is performed.
  • the protection switching process in the case of a single-span failure is described in Section 5.1.
  • Figure 10 is a schematic diagram of the protection principle of the two-fiber channel shared ring protection when the E-F span fails again after the C-D span occurs in the ring network.
  • the cross-segment 5 is faulty again. If the new affected service T2 is switched in the same manner as the cross-segment 3, the double-end switching of the similar service T1 occurs. This will lead to a misconnection of the ring network business.
  • the approach proposed for this invention is:
  • each node determines the occurrence of the network fault according to the received APS signaling (for details of the decision process, refer to the description in Section 5.1). Finally, each node can determine that the fault occurs in C according to the received APS signaling. - D spans section 3 and EF spans section 5.
  • the original channel switching state of the node E should be changed to the channel idle state immediately, and the original channel straight-through state of the node F should be The change is the channel idle state, and will not be switched due to the E-F span fault, achieving the purpose of simple error prevention.
  • the channel protection state is maintained.
  • the original state does not require a new protection switching action.
  • the channel protection state remains in the channel idle state.
  • Figure 11 shows that the AH span 8 occurs again on the basis of the double-span fault shown in Figure 10 in the ring network.
  • the situation of the failure According to the method proposed by the present invention, the process is implemented as follows:
  • each node determines the occurrence of the network fault according to the received APS signaling (for details of the determination process, refer to the description in Section 5.1). Finally, each network node can analyze the network fault occurrence as follows: For node D, E, can determine that there is a fault between span 3 and span 5; for nodes F, G, H, it can be judged that span 5 and span 8 fail; for node 8, (, can determine span 3 and span Segment 8 has failed.
  • the channel protection status of the node G, H. is not affected (the node G maintains the original channel through state; the node H has the service T3 and T4 at the same time, and the channel protection should be determined according to the judgment of the service ⁇ 4 affected by the failure.
  • the status is the channel idle state). For nodes A and D that do not have local uplink/download traffic, the channel protection state remains in the channel idle state.
  • the channel sharing ring protection directly corresponds to the service in the protection granularity, and the double-ended switching is directly performed on the upper node and the lower node of the service to form a new loop, and the fault is no longer used in the same manner as the multiplex section ring protection.
  • Double-end switching between adjacent nodes at both ends of the segment avoids forming a long In the overlapping loopback loop, the implementation of the channel shared loop protection is more flexible and economical.
  • the switched node can be adjusted to idle.
  • the state mode realizes the function of simply blocking the transmission without turning off the service transmission device.
  • the method of the invention is suitable for protection switching and error blocking of channel sharing ring protection in a ring optical transmission network using wavelength division multiplexing technology, and the method of the invention is also suitable for other optical fiber transmission networks, and other similar applications exist. field.

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

Abstract

L'invention concerne un procédé de mise en oeuvre d'une protection annulaire partagée par les canaux, qui peut prendre en charge la prévention des défaillances dans un réseau en anneau. Pour le service dans lequel la plage de défaillance survient dans une voie de travail, une commutation à deux extrémités est directement assurée sur le noeud montant et le noeud descendant dans ladite voie de travail, ce qui permet de former une voie de protection contre ladite plage de défaillance. Ainsi, la boucle de chevauchement et indirecte formée à cause de la commutation à deux extrémités pour deux noeuds adjacents de plage de défaillance, peut être supprimée.
PCT/CN2005/001016 2005-07-11 2005-07-11 Procede de mise en oeuvre de la prevention des defaillances facile prise en charge par la protection annulaire partagee des canaux WO2007006175A1 (fr)

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PCT/CN2005/001016 WO2007006175A1 (fr) 2005-07-11 2005-07-11 Procede de mise en oeuvre de la prevention des defaillances facile prise en charge par la protection annulaire partagee des canaux

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PCT/CN2005/001016 WO2007006175A1 (fr) 2005-07-11 2005-07-11 Procede de mise en oeuvre de la prevention des defaillances facile prise en charge par la protection annulaire partagee des canaux

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015052226A1 (fr) 2013-10-11 2015-04-16 F. Hoffmann-La Roche Ag Thiazolopyrimidinones en tant que modulateurs de l'activité du récepteur nmda
US11362861B2 (en) * 2020-01-28 2022-06-14 Honda Motor Co., Ltd. Operating device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1276263A2 (fr) * 2001-07-11 2003-01-15 Alcatel Procédé, dispositif et signalisation dans une architecture en anneau de protection partagée
EP1389843A1 (fr) * 2002-08-05 2004-02-18 Alcatel Protection de chemin M:N
CN1567805A (zh) * 2003-06-17 2005-01-19 中兴通讯股份有限公司 支持通道共享环保护的保护倒换协议实现方法
WO2005015795A1 (fr) * 2003-08-05 2005-02-17 Telecom Italia S.P.A. Procede permettant de fournir des chemins pour trafic supplementaire avec protection de connexion dans un reseau de communication, reseau connexe et produit de programme informatique associe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1276263A2 (fr) * 2001-07-11 2003-01-15 Alcatel Procédé, dispositif et signalisation dans une architecture en anneau de protection partagée
EP1389843A1 (fr) * 2002-08-05 2004-02-18 Alcatel Protection de chemin M:N
CN1567805A (zh) * 2003-06-17 2005-01-19 中兴通讯股份有限公司 支持通道共享环保护的保护倒换协议实现方法
WO2005015795A1 (fr) * 2003-08-05 2005-02-17 Telecom Italia S.P.A. Procede permettant de fournir des chemins pour trafic supplementaire avec protection de connexion dans un reseau de communication, reseau connexe et produit de programme informatique associe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015052226A1 (fr) 2013-10-11 2015-04-16 F. Hoffmann-La Roche Ag Thiazolopyrimidinones en tant que modulateurs de l'activité du récepteur nmda
EP3415519A1 (fr) 2013-10-11 2018-12-19 F. Hoffmann-La Roche AG Thiazolopyrimidinones en tant que modulateurs de l'activité du récepteur nmda
US11362861B2 (en) * 2020-01-28 2022-06-14 Honda Motor Co., Ltd. Operating device

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