CN100370781C - A ring network protection control method - Google Patents
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- CN100370781C CN100370781C CNB2005100330248A CN200510033024A CN100370781C CN 100370781 C CN100370781 C CN 100370781C CN B2005100330248 A CNB2005100330248 A CN B2005100330248A CN 200510033024 A CN200510033024 A CN 200510033024A CN 100370781 C CN100370781 C CN 100370781C
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Abstract
一种涉及数字信息传输的环网保护控制方法，采用如下步骤：1)在由多个节点构成的环网中，为每个节点分配一个标识，为工作通道设置相应的保护通道，2)于每个节点保存环网拓扑图和本地业务拓扑表；网络拓扑图通过标识反映环网的拓扑结构，本地业务拓扑表反映在本节点上下的业务，以及根据网络拓扑图的相关工作路径，3)各节点检测到网络故障时，通过通信通道向环网中的各节点传递网络故障信息，4)环网中的各节点根据网络故障信息、环网拓扑图和本地业务拓扑表，判断所述的网络故障对本节点业务的影响，并采取相应的保护通道业务倒换或穿通；本发明操作简单、可靠性高、业务兼容性和实用性强，本发明可广泛适用于WDM环网、SDH环网、OTN环网。
A ring network protection control method involving digital information transmission adopts the following steps: 1) in a ring network composed of multiple nodes, assign an identifier to each node, and set a corresponding protection channel for a working channel; Each node saves the ring network topology map and the local business topology table; the network topology map reflects the topology structure of the ring network through identification, and the local service topology table reflects the services on and below the node, as well as the relevant working paths according to the network topology map, 3) When each node detects a network fault, it transmits network fault information to each node in the ring network through the communication channel, and 4) each node in the ring network judges the above-mentioned The impact of network failure on the business of this node, and the corresponding protection channel business switching or pass-through; the invention is simple in operation, high in reliability, business compatibility and practicability, and the invention can be widely applied to WDM ring network, SDH ring network, OTN ring network.
Description
Technical field
The present invention relates to digital information transmission, relate in particular to a kind of loop network protection controlling method.
Background technology
The progress of optical device, greatly promoted the development of optical communication technique, especially the development of wave division multiplexing WDM technology, the message capacity that simple optical fiber can carry is up to Tbps, in this case, bottom optical network optical fiber line fault or equipment fault often exert an influence to a large amount of business.
Network survivability just is meant that network still can keep the ability of acceptable quality of service grade during standing network failure and equipment failure.The key technical indexes that characterizes the network survivability performance has: redundancy, recovery rate and recovery time.Redundancy is defined as in the network ratio of total idle capacity and total work capacity, and mainly being the measurement system can the required extra cost of paying for improving survivability; Recovery rate refer to fault a situation arises down, the ratio of the port number that has recovered and the overall channel number of original inefficacy, or the ratio of the capacity that has recovered and original total inefficacy capacity, for the backbone optical network of bottom, often requiring is 100% recovery rate; Refer to that network is to recover the required consumed time of failure service recovery time.
Different business is different fully to the requirement of recovery time.Under the general situation, the ATM of large-scale financial institution and bank is the highest to requirement recovery time of business, generally requires less than 50ms; Common communication service is higher to the suffertibility of service outage duration, but generally also is no more than 30 minutes.These business are after process switch or router processing, transmit through optical-fiber network.Generally speaking, when transmission network break period was between 50～200ms, the connection losing probability of the reciprocal exchange of business did not have influence less than 5% substantially for No.7 nation-wide Network and cell relay service.When transmission network increased between 200ms～2s break period, reciprocal exchange of business losing probability began progressively to rise, surpass 2s after, most circuit switching connection, special line, dial business all will be lost.And when transmission network arrives 10s break period, all communication sessions all will be lost connection.And if surpass transmission network break period after 5 minutes, will cause longer time irrecoverable of the serious obstruction of switch and upper-layer service.
Along with further developing of telecommunication technology, network bandwidth requirements is more and more higher, the wave division multiplexing WDM technology can transmit miscellaneous services such as SDH (Synchronous Digital Hierarchy) SDH or other gigabit Ethernet GE, 10GE by a wavelength, in an optical fiber, can transmit more wavelength such as 8 ripples, 40 ripples, 80 ripples, 160 ripples, thereby the network bandwidth is increased greatly, and the multiplexing of wave division multiplexing WDM system is the multiplexing of photosphere.
In wdm system, generally there is double-layer structure: electricity layer photoreactive layer.At first the mode by light-electrical-optical is output as the wavelength that meets the wdm system needs with the client's business that inserts, and then will be transmitted in a plurality of wavelength multiplexings to an optical fiber by photosphere equipment.In order to carry out system management, general information of distributing a certain wavelengths to transmit management channels specially, this passage is called Optical Supervisory Channel OSC, also can utilize the professional expense that does not have use itself, perhaps the signal of additional another one frequency transmits management information on service signal, this wavelength dedicated of not using is used as management channels, and this passage is called Electric Supervisory Channel ESC.No matter be by OSC or ESC, the information by the respective channel transmission of guaranteeing can be passed to any one node in the territory.
In telecommunications network; SDH (Synchronous Digital Hierarchy) SDH technology is because its maturation, reliable; satisfy the carrier class requirement and obtain general use; in the SDH network; multiplex section protection and multi-section shared protection are the protection schemes of using always; as shown in Figure 1, wherein be with oblique line partly to represent service aisle, white portion represents to protect passage.If between node a and the node d business is arranged; under the normal condition; business is walked the service aisle of the band oblique line between the abcd between node a and the node d; under the situation that optical fiber breaks down between node b and the node c; according to the multiplex section rearrangement agreement; the node detection at fault two ends is after fault; an at first own other end according to the network topological diagram failure judgement; and start turning protocol and will need the other end that sends to fault of switching carried out; after the fault detect node receives the switch messages that the other end of fault sends over; execution is switched; fault as shown in Figure 1, then at node b with the switching services of service aisle to the protection passage, be transferred to the another one node c of fault by the protection passage always; the switching services that to protect passage at node c is to service aisle, and the transmission line after the protection is shown in the circuit of Fig. 1.
The basic principle of multiplex section rearrangement and feature are as follows in the SDH network:
1, each node is preserved the topological diagram of looped network.
2, need total bandwidth capacity separated into two parts, wherein half is as service aisle, and half is as the protection passage.
When 3, fault takes place, two end-point detection faults in fault, and the fault end points is carried out turning protocol, and the multiplex section rearrangement agreement will be guessed an other end of fault according to ring-network topology figure, and the switching request result that this node agreement is carried out is sent to the another one end points of fault.
4, the fault end points is after receiving the switching request that the another one fault point sends over, according to the command execution bridge joint-switching action of turning protocol.
5, protocol information transmits by the K1 in the own SDH frame, K2 byte respectively at two end points of fault.
6, each intermediate node can not perceive this fault generation, does not carry out any action yet, no matter whether its business passes through faulty section, still sends according to original path.
7, the multiplex section rearrangement agreement meets ITUT and G.841 stipulates.
The single electricity layer multiplexing structure that the multi-section shared protection of SDH is based on SDH proposes; do not consider multiplexing structure, signaling transmission and transmission range, the node of the photosphere transmission problem that influences to the photosphere characteristic, this also causes the multi-section shared protection incompatibility photosphere transmission of SDH.
For the photosphere transmission, this multi-section shared protection has following shortcoming:
1, it is long to switch the path, and as shown in Figure 1, the business between node a and the node d is abafedcd switching the path of being walked the back, and obviously, this path does not belong to optimizes the path, as afed.For the photosphere signal, the long performance that will have a strong impact on photosphere in path may cause the luminous power deterioration, problems such as signal to noise ratio deterioration.
2, the accurate other end of failure judgement of malfunctioning node can only guess that an other end of fault is exactly next neighbors according to network topological diagram, and if node failure, the conjecture at fault two ends is wrong all just so.For example shown in Figure 2, all there be professional the connection between node a and node c, node a and the node f, if node a breaks down, carry out " bridge joint and switch " action respectively at node b and node f according to the rule of multiplex section rearrangement so, the result be node c send to node a business will through behind the cbcdef under node f, equally, node f sends to the business of node a will be under node c, as shown in Figure 3, produced wrong connection, in order to address this problem, must to define complicated compacting mechanism in the multiplex section rearrangement rule G.841 again and solve the wrong problem that connects.
Summary of the invention
The object of the present invention is to provide a kind of simple to operate, loop network protection controlling method that reliability is high, to overcome the defective of prior art incompatibility photosphere transmission.
Loop network protection controlling method of the present invention adopts following steps:
1) in the looped network that is made of a plurality of nodes, for each node distributes a sign, same service aisle is shared in Network, corresponding to described service aisle the corresponding protection passage is set;
2) preserve ring-network topology figure and local service topology table in each node; Described network topological diagram is by the topological structure of sign reflection looped network; Described local service topology table is reflected in this node business that needs protection up and down, and according to related work path that network topological diagram produced;
When 3) node detection is to network failure, this fault message is broadcast to other node of looped network by communication port;
4) each node in the looped network is judged the influence of described network failure to this node business according to described network failure information, ring-network topology figure and local service topology table, and takes the corresponding protection channel service to switch or break-through.
In the described step 3), certain bandwidth that described communication port can be for, band distributes in the expense in the outer or band by this communication port, can be delivered to the information of needs transmission any one node in the looped network;
The outer expense of described band is other communication port that is independent of service signal, can be the Electric Supervisory Channel ESC of Optical Supervisory Channel OSC or other frequency signal of modulating on service signal, optical transport layer OTS, optical multiplexing section OMS in the optical transfer network OTN signal, optical channel layer OCH expense;
Expense is the expense that service signal itself carries in the described band, can be the MSOH of synchronous digital hierarchy SDH signal or optical channel transmission unit OTU, Optical Channel Data Unit-k ODU in the optical transfer network OTN signal, optical channel Payload Unit OPU expense;
The information of described communication port can be used dedicated packet or the Frame that has the rendezvous protocol form in looped network.
Described step 3) adopts following steps:
When 31) described node device detects network failure,, judge the residing relative position information of network failure, and produce corresponding network failure information according to network topological diagram;
32) to other each node delivery network fault message, described network failure information is in each node termination by communication port for described node.
The business of described business for being protected;
In the described step 4), each node in the looped network judges according to described network failure information, ring-network topology figure and local service topology table whether network failure influences this node business up and down:
41) if the professional up and down operating path of this node has passed through the network failure section, represent that this business has been subjected to influence, then continue to judge whether network failure influences the protection path of this business:
411) if the network failure section is not passed through in the protection path of this business, represent that the protection path of this business is not affected, promptly the protection path of this node business can lead to, then with the protection passage of this switching services to its correspondence;
412) if the protection path of this business through the network failure section, represents that the protection path of this business has been subjected to influence, promptly the protection path of this node business is obstructed, then should business not switch, and keeps the protection passage of this business correspondence to put break-through in this section;
42) if this node business up and down not through network failure section or the supreme business down of this node, represents that promptly this node business is not affected, then keep protecting passage to put break-through in this section.
Described protection path is the Network Transmission path reverse with operating path in the protection passage.
After the described step 4), adopt following steps:
When 5) described node device detects network disaster recovery, produce corresponding network disaster recovery information;
6) described node by communication port to other each node delivery network fault recovery information;
7) in the described node since network disaster recovery information in the related switching services that network failure produced be cancelled, the recovery and protection passage is put break-through in this section.
In the described step 1), described looped network is the wave division multiplexing WDM looped network, in described wave division multiplexing WDM looped network, for the operation wavelength that each or every group need protection is distributed the corresponding protection wavelength.
In the described step 1), described looped network is a SDH (Synchronous Digital Hierarchy) SDH looped network, and in described SDH (Synchronous Digital Hierarchy) SDH looped network, the work Virtual Channel VC that needs protection for each or every group distributes corresponding protection Virtual Channel VC.
In the described step 1), described looped network is optical transfer network OTN, and in described optical transfer network OTN, the work Optical Channel Data Unit-k ODU that needs protection for each or every group distributes corresponding protection Optical Channel Data Unit-k ODU.
Beneficial effect of the present invention is: in the present invention; by network topological diagram and local service topology table multiplex section fault detect and service source destination node are switched and to be combined together; after network failure information broadcasted in network; make each node can both obtain network failure information; switching services can be carried out at source, the destination node of business, make concerning every business, the protection path all is the shortest; in determining network failure, do not need to increase extra complicated approach and assisted.
In the looped network share protect; same service aisle is shared by a plurality of business between each node of looped network; but there is not path overlap between each business, as shown in Figure 4, therefore; faulty section only can influence a business on the ring; node failure at most only influences two business on the looped network, if this node is the source/destination node of two business just, influences two business so; if this node only is one of them professional source node or destination node, so only influence a business.
The wrong precondition that produces that connects is to exist under the situation of node failure or multistage fiber failure on the ring; cause having simultaneously two or more source nodes to switch the business to the protection passage, and destination node because can't discern be which business come and wrong reception the business of protection passage.In the present invention; node oneself can know whether the business of oneself is influenced according to network topological diagram and local service topology table; whether the protection passage of oneself is logical; thereby determine oneself whether to be necessary to switch; this has just determined the present invention that the wrong precondition that produces that connects can not take place from principle, in other words, at the protection passage business is arranged if guaranteed like this; so be certainly one significant, can walk logical business.See conversely logical since the protection passage can be walked, so according in the looped network share protect, by business can be not overlapping principle as can be seen, also inevitable this business that needs protection that only influence of network failure section.If there is the multistage fiber failure, it is obstructed that this business can be judged oneself protection passage so, thus no longer with oneself switching services to the protection passage; prevented the generation of wrong company; therefore, can there be the wrong problem that connects in the present invention on principle, guaranteed functional reliability of the present invention.
Therefore, the present invention is simple to operate, reliability is high.
In the present invention, by communication port each node delivery network fault message in looped network, business datum itself need not terminate with the node that oneself has nothing to do, each node directly takes the corresponding protection channel service to switch or break-through according to network failure information, has further improved operating efficiency of the present invention and reliability; The present invention is directed to the professional concrete condition that whether needs protection, whether each business customizing is needed to protect, help improving bandwidth utilization, improve practicality of the present invention, the present invention can be widely used in WDM looped network, SDH looped network, OTN looped network.
In a word, the present invention is simple to operate, reliability is high, business is compatible and practical.
Description of drawings
Fig. 1 switches the protection exemplary plot for prior art;
Fig. 2 is the professional connection diagram of prior art;
Fig. 3 is at the switching services schematic diagram of Fig. 2 in the prior art;
Fig. 4 constitutes schematic diagram for embodiment of the invention looped network;
Fig. 5 is a control flow schematic diagram of the present invention.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
Looped network as shown in Figure 4 is made of 5 node A, B, C, D, E, has 3 professional connections, represents with heavy line each professional connection, wherein, has professional a connection between node A and the node C; There is professional a connection between node C and the node D, has professional a connection between node A and the node D; Dotted line is represented the protection passage of looped network, and this protection passage is last 3 professional being shared of ring.As shown in Figure 4, each Network is distributed in the diverse location of network, they share same service aisle, promptly, when transmitting, these 3 business used same resource on looped network: such as, for optical transfer network OTN, used the same Optical Channel Data Unit-k ODU of OTN frame, perhaps use the same wavelength channel in the wave division multiplexing WDM.
Concrete control flow of the present invention is as follows:
1, as shown in Figure 4 and Figure 5, in the looped network that constitutes by node A, Node B, node C, node D and node E, for each node distributes a sign, for example, node A, Node B, node C, node D, node E are designated 1,2,3,4,5 respectively, and each node is all known the sign of oneself.Same service aisle is shared in above-mentioned 3 Networks, corresponding to described service aisle the corresponding protection passage is set, i.e. dotted line ring portion among Fig. 4.
2, as shown in Figure 5, preserve ring-network topology figure and local service topology table in each node, network topological diagram is by the topological structure of sign reflection looped network, and the local service topology table is reflected in this node business up and down, and according to related work path that network topological diagram produced.
Wherein, network topological diagram: for example, connect each node identification according to clockwise direction, this network topological diagram is 1-2-3-4-5-1.
Local service topology table: for example,, have (ABC and AED) about two business, so the local service topology table of node A can be as shown in table 1 for node A.
| Operating path |
| 1-2-3 |
| 4-5-1 |
Table 1
As shown in Table 1, each row has shown existence of a business, and the pairing content of each row has reflected the related work path according to network topological diagram, imbody source point, place point and intermediate node.
In like manner analogize, Node B is not because have about the business, and therefore, the local service topology table of Node B is empty.
The local service topology table of node C is as shown in table 2.
| The path |
| 1-2-3 |
| 3-4 |
Table 2
The local service topology table of node D is as shown in table 3.
| The path |
| 3-4 |
| 4-5-1 |
Table 3
Node E is the same with Node B, for the local service topology table of node E is empty.
3, as shown in Figure 4 and Figure 5, when described node device detects network failure,, judge the residing relative position information of network failure, and produce corresponding network failure information according to network topological diagram.
With the Node B is example, such as node A-〉optical fiber of Node B is to be connected on the light mouth 1 of Node B, and the optical fiber of Node B-node C is to be connected on the light mouth 2 of Node B, and the light mouth detects 1 to network failure so, and network failure just is in the left side of this node so; Light mouth 2 detects fault just on the right of this node.
Can be at band outer or be with in certain bandwidth of distributing in the expense as communication port, for example, in Optical Supervisory Channel OSC, distribute 2 fixing bytes to come the delivery network fault message, if node detection to the right side of fault at this node, is inserted the sign of this node in first byte so; If node detection, is inserted the sign of this node in second byte in this node left side so to fault.
Now establish and optical fiber occurs between node A and the Node B and break down, node A and Node B all can detect this network failure so, it is right-hand member at oneself that node A judges this network failure, therefore in first byte in node A 2 bytes that the sign of oneself is inserted in the communication port to be distributed, as shown in table 4, Node B detects the left side of network failure at oneself, therefore, Node B is just inserted the sign of oneself in wherein second byte, produces corresponding network failure information thus.
| First byte (fault is at the node right-hand member) | Second byte (fault is at the node left end) |
| 1 | 2 |
Table 4
4, as shown in Figure 4 and Figure 5, node A and Node B are transmitted this network failure information by communication port to other each node, and this network failure information is in each node termination, and thus, each node obtains this network and fault occurred between node A and Node B.
In the present invention, certain bandwidth that communication port can be for, band distributes in the expense in the outer or band is perhaps used special-purpose packet or Frame, by this communication port, the information of needs transmission can be delivered to any one node in the looped network.
Wherein, being with outer expense is other communication port that is independent of service signal, the Electric Supervisory Channel ESC of Optical Supervisory Channel OSC or other frequency signal of on service signal, modulating can be, also the optical transport layer OTS in the OTN signal, optical multiplexing section OMS, optical channel layer OCH expense can be.Expense is the expense that service signal itself carries in the band, can be the MSOH of synchronous digital hierarchy SDH signal or the optical channel transmission unit OTU in the OTN signal, Optical Channel Data Unit-k ODU, optical channel Payload Unit OPU expense.The information of communication port can be used dedicated packet or the Frame that has the rendezvous protocol form in looped network.
5, as shown in Figure 4 and Figure 5, each node in the looped network judges according to described network failure information, ring-network topology figure and local service topology table whether network failure influences this node business up and down:
51,, represent this node business up and down has been subjected to influence, judges then whether network failure influences the protection path of this node business if the professional up and down operating path of this node has passed through the network failure section:
511, if the network failure section is not passed through in the protection path of this node business, represent that the protection path of this node business is not affected, promptly the protection path of this node business can lead to, and then this node switching services is arrived the protection passage.
512, if the protection path of this node business through the network failure section, represents that the protection path of this node business has been subjected to influence, promptly the protection path of this node business is obstructed, and then this node business is not switched, and keeps the break-through of protection channel service.
52, if this node business up and down not through network failure section or the supreme business down of this node, represents that promptly this node business is not affected, then keep protecting passage to put break-through in this section.
For node A: according to network failure information; faulty section is between node A and the Node B; inquire about the local service topology table again; finding has 1-2-3 through the business of faulty section; therefore this 1-2-3 business is impaired; in the present invention; the protection path setting is the Network Transmission path reverse with operating path in the protection passage; contrast network topological diagram (1-2-3-4-5-1) as can be known; the protection path corresponding with professional 1-2-3 should be 1-5-4-3, finds that its protection path 1-5-4-3 does not pass through the network failure section, can send to place point 3 with this business by protection path 1-5-4-3; therefore, node A will and node C between switching services to the protection passage.
For Node B: service allocation list is empty, the break-through of protection channel service.
For node C: contrast local service topology table, the professional 1-2-3 of this node is through the network failure section, so this node business is impaired, exists protection path 3-4-5-1 to lead to simultaneously, and therefore, node C switches to the protection passage with this business.
For node D: contrast local service topology table, this node business is not passed through the network failure section, so this node business is not affected, and the business of protection passage is put break-through in this section.
For node E: this node is not professional up and down, therefore, and the break-through of protection channel service.
Like this, by above control flow, finished protection to impaired ABC business.
6, when network disaster recovery is arrived in the Equipment Inspection of node A and Node B, produce corresponding network disaster recovery information, for example, left sibling, right node in 2 bytes that can fix in the communication port approximately to be distributed all filled out 0 expression network free barrier information, therefore, after node A, Node B detected network disaster recovery, the information that this node is inserted was revised as 0 respectively, be that node A is revised as 0 with first byte, Node B is revised as 0 with second byte.
7, node A and Node B are transmitted this network disaster recovery information by communication port to other each node;
8, in the node since network disaster recovery information in the related switching services that network failure produced be cancelled; the recovery and protection passage is put break-through in this section; from the above mentioned as can be known; because optical fiber occurring between node A and the Node B breaks down; node A and node C have made corresponding business and have switched; therefore, node A and node C cancel switching services, and the recovery and protection passage is put break-through in this section.
Protection with regard to another kind of network failure describes below, if fault has appearred in node A (source node, destination node), perhaps two sections optical fiber of AE/AB break down:
At first, Node B and node E detect fault, and as above an example is described, and in 2 bytes of being distributed in communication port, first byte is filled out 5, the second bytes and filled out 2.
After each node of network is received this network failure information, the contrast network topological diagram as can be known, the 5-1-2 segment fault, and node A with Network Isolation.According to abovementioned steps 5, each nodal operation is as follows:
Node B: because business configuration is empty, do not exist business influenced by faulty section, therefore protect the channel service break-through.
Node C: the professional 1-2-3 fault of this node, but protect path 3-4-5-1 to pass through faulty section equally, promptly the protection path of this node business is obstructed, so keep the break-through of protection passage.
The D node: contrast local service topology table, the professional 4-5-1 fault of this node, protection path 4-3-2-1 also passes through the network failure section, and the protection path of this node business is obstructed, so keep the break-through of protection passage.
Node E: service allocation list is empty, the break-through of protection channel service.
Therefore, after node A fault, each node just can know by simple judgement whether current business is necessary to switch, and therefore, can not cause wrong the company.
In the present invention; the concrete condition that can whether need protection at business; whether each business customizing is needed to protect; the business that need be protected is protected by above-mentioned control flow; for its concrete processing, only need in the local service topology table, to increase professional corresponding protection and enable item, for example; protection enables item and represents that with logical one corresponding service needs protection, and logical zero represents that corresponding service does not need protection.Enable item for protection and be the business of logical one, can be protected it by above-mentioned control flow; Enable item for protection and be the business of logical zero, in the protection of above-mentioned control flow is operated, it is considered as not existing get final product.
Described above is protection under the single passage situation, such as a VC passage in the SDH network, and a wavelength in the WDM network, an ODU passage in the OTN network.And a multiplex section may comprise a lot of passages; in the present invention; can specify its resource conservation for the business that needs protection; when looped network is the wave division multiplexing WDM looped network; in this wave division multiplexing WDM looped network, distribute the corresponding protection wavelength for the operation wavelength that each or every group need protection, each or every group of operation wavelength that needs protection are service aisle; corresponding corresponding protection wavelength is promptly protected passage.
For example: looped network is the wave division multiplexing WDM looped network, and 32 wavelength availables are arranged in this WDM network, is expressed as wavelength 1, wavelength 2 respectively ... wavelength 32.Its medium wavelength 1-wavelength 25 has inserted business, and wavelength 26-wavelength 32 is still idle.In the wavelength of business transferring, its medium wavelength 1, wavelength 5; wavelength 12 professional important need be protected, therefore; we can specified wavelength 1 the protection wavelength be wavelength 26, the protection wavelength of wavelength 5 is a wavelength 27, the protection wavelength of wavelength 12 is a wavelength 28.Protection to each operation wavelength can be by above step 1 to the described realization of step 8, and its concrete control flow is same or similar, need not give unnecessary details herein.
In like manner; when looped network is optical transfer network OTN; in this optical transfer network OTN; the work Optical Channel Data Unit-k ODU that needs protection for each or every group distributes corresponding protection Optical Channel Data Unit-k ODU; each or every group of work Optical Channel Data Unit-k ODU that needs protection are service aisle; corresponding corresponding protection Optical Channel Data Unit-k ODU promptly protects passage.For example: 16 Optical Channel Data Unit-k ODU are arranged, and wherein the 1st to the 8th ODU supposes the service needed protection of the 5th ODU unit of 1-in business transferring, therefore distributes the 13rd ODU unit of 9-to correspond respectively to the 5th ODU unit of 1-and protects.
In SDH (Synchronous Digital Hierarchy) SDH looped network, for distributing corresponding Virtual Channel VC, each Virtual Channel VC that needs protection protects, and the Virtual Channel VC that each needs protection is a service aisle, and corresponding corresponding Virtual Channel VC promptly protects passage.
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| CN100454880C (en) * | 2006-11-01 | 2009-01-21 | 华为技术有限公司 | A method and system for realizing ring network protection |
| CN101447848A (en) * | 2007-11-28 | 2009-06-03 | 华为技术有限公司 | Method and device for realizing ring network protection |
| CN101626272B (en) * | 2008-07-10 | 2013-03-20 | 中兴通讯股份有限公司 | Method for realizing error connection prevention in optical network |
| CN101729347B (en) * | 2008-10-27 | 2012-08-15 | 华为技术有限公司 | Method, system and device for protecting circuit loop |
| CN101753283B (en) * | 2008-11-28 | 2014-04-02 | 华为技术有限公司 | Network business reliability determination method, device and system |
| CN101771465B (en) * | 2008-12-29 | 2013-01-23 | 华为技术有限公司 | Protection switching method, device and system of multi-service transport network |
| CN101800913B (en) * | 2009-02-11 | 2013-02-27 | 中兴通讯股份有限公司 | Realization method for protecting and restoring multiplex section of automatically switched optical network |
| CN102014011A (en) * | 2009-09-04 | 2011-04-13 | 中兴通讯股份有限公司 | Method and system for protecting looped network |
| CN102104520B (en) * | 2009-12-18 | 2013-08-21 | 中兴通讯股份有限公司 | Ring network protection method and device based on topology information |
| CN101834757B (en) * | 2010-04-01 | 2014-08-13 | 深圳英飞拓科技股份有限公司 | Methods for automatically detecting topology of optical transmission monitoring networks and implementation device |
| CN103563395B (en) * | 2013-01-08 | 2017-09-08 | 华为技术有限公司 | A kind of graphic software platform method and apparatus of optical transfer network |
| CN104753780B (en) * | 2013-12-26 | 2020-05-22 | 中兴通讯股份有限公司 | A kind of POTN network ODUK ring planning method and device |
| CN104954160B (en) * | 2014-03-28 | 2019-02-26 | 中国移动通信集团内蒙古有限公司 | A method for realizing multiple protection of bearer network and bearer network |
| CN106941373B (en) * | 2017-03-21 | 2019-09-17 | 烽火通信科技股份有限公司 | A kind of device and method for realizing broadcasting service protection in optical transfer network |
| CN107104832B (en) * | 2017-04-20 | 2023-06-16 | 上海欣诺通信技术股份有限公司 | Method and equipment for automatically discovering cross-node service topology on transoceanic multiplexing section ring network |
| CN109101359B (en) * | 2018-08-13 | 2022-04-26 | 上海联影医疗科技股份有限公司 | Equipment, method and module for transmitting information between equipment components and computer equipment |
| CN110440391B (en) * | 2019-08-07 | 2020-10-27 | 珠海格力电器股份有限公司 | Loop network protection method and air conditioning system |
| CN113660105B (en) * | 2021-06-21 | 2023-07-04 | 广西电网有限责任公司 | Method and device for positioning service faults of MPLSVPN (multiple virtual private network) |
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