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Bidirectional channel restitution in automatic optical exchange network

A two-way channel and recovery method technology, applied in the field of two-way channel recovery, can solve problems such as slow recovery speed, lack of consideration of parallelism, complex recovery conditions, etc., and achieve the effects of simple operation, accelerated recovery process, and shortened recovery time

Inactive Publication Date: 2003-06-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current channel-based recovery method is a serial operation, namely: fault notification, route calculation, cross-connection release, path building process, and path tearing process
does not take parallelism between these operations into account, so recovery is slower
Moreover, the recovery situation of the two-way channel is much more complicated than that of the one-way channel. At present, there is no public announcement on the recovery plan of the two-way channel.
Therefore, the difficulty of channel-based recovery lies in: (1) how to improve the recovery speed; (2) how to simplify the operation

Method used

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  • Bidirectional channel restitution in automatic optical exchange network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] exist figure 2 In the network environment shown, there are bidirectional optical channels: (I, T1, E). Now assume that the link from I to T1 fails, that is, point B fails. T1 and E detect loss of optical signal. The actions of each node are as follows:

[0027] Because T1 is an intermediate node, there is no action.

[0028] E is the egress node, so I is notified of the failure, and the cross-connect is removed.

[0029] Ingress node I first receives the fault notification, and the subsequent operations are as follows:

[0030] 1) Routing calculation, while releasing the cross-connection.

[0031] 2) Assuming that the calculated new path is (I, T2, E), after the cross-connection is released, the signaling process of path construction starts (sending a path construction request to T2).

[0032] 3) After the road construction is completed (the road construction response is received), the signaling process of road tearing down is started (the road tearing down reque...

Embodiment 2

[0036] exist figure 2 In the network environment shown, there are bidirectional optical channels: (I, T1, E). Now assume that the link from T1 to I fails, that is, point A fails. I detected loss of optical signal. The actions of each node are as follows:

[0037] Ingress node I first finds that the optical signal is lost, and the subsequent operations are as follows:

[0038] 1) Routing calculation, while releasing the cross-connection.

[0039] 2) Assuming that the calculated new path is (I, T2, E), after the cross-connection is released, the signaling process of path construction starts (sending a path construction request to T2).

[0040] 3) After the road construction is completed (the road construction response is received) and the fault notification from E is received, the signaling process of the road tearing down is started (the road tearing down request is sent to T1).

[0041] 4) The path removal is completed (the path removal response is received), and the res...

Embodiment 3

[0045] exist figure 2 In the network environment shown, there are bidirectional optical channels: (I, T1, E). Now assume that the links between T1 and I both fail, that is, the two points A and B fail. The actions of each node are the same as in Embodiment 2, except that in Embodiment 2: T1 and E find that the optical signal is lost because I cancels the cross-connection. However, in Embodiment 3: T1 and E find that the cause of the optical signal loss is a link failure. The whole process is as Figure 5 .

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Abstract

A bidirectional channel restoration method in automatic optical switch network for finding out, informing and debugging link failure of automatic switch transfer network (ASTN) and automatic optical switch network (AOSN) features that after a link failure is found out, the entrance node of channel begins to calcualte a new channel different from origional one for bearing original interrupt service and the exit node inform the entrance node of the failure. After channel calculation is finished, the entrance node beings to the signaling procedure for creating new channel. After new channel is created, the original channel is removed.

Description

Technical field: [0001] The invention relates to a bidirectional channel recovery method in an automatic optical switching network, which is suitable for the recovery of link faults in the automatic optical switching network and belongs to the technical field of optical fiber communication. technical background: [0002] In an automatic switching transport network or an automatic switching optical network, when a link fails, it first appears as a loss of an optical signal received by a node (or other failure information). For a bidirectional channel, a link failure may occur in the forward channel, the reverse channel, or both the forward channel and the reverse channel. For the forward channel failure, the exit node of the channel will find the optical signal loss; for the reverse channel, the ingress node of the channel will find the optical signal loss; and for the bidirectional failure, both the egress node and the ingress node will find the optical signal loss. After t...

Claims

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Application Information

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IPC IPC(8): H04B10/03H04B10/25H04L12/437
Inventor 王晓冬金耀辉张春蕾胡卫生姜淳
Owner SHANGHAI JIAO TONG UNIV
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