Patent
Segment switching device
Shimada Naohiro
- 10 Dec 1999
2
TL;DR: In this article, a fault detection function monitors an external signal 1-2 to be inputted and detects it as a fault occurrence when it is stopped, and a fault restoration operation is performed at a restoration circuit 1-6 at a first node in the downstream and an overlapped operation is not executed at the subsequent nodes in downstream.
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Abstract: PROBLEM TO BE SOLVED: To start restoration operation in an upstream most segment in segments where faults are detected by detecting a fault occurred to a pass by monitoring an input signal and having the detected fault restored in accordance with control of a relationship between the detection of the fault and an operation corresponding to this. SOLUTION: A fault detection function 1-3 monitors an external signal 1-2 to be inputted and detects it as a fault occurrence when it is stopped. When the fault is detected at a first node in the downstream of a fault occurring point, a similar fault is detected also at the subsequent nodes in the downstream. A fault restoration operation is performed at a restoration circuit 1-6 at a first node in the downstream and an overlapped operation is not executed at the subsequent nodes in the downstream. An operation control function 1-4 is provided so as to avoid this overlapped operation and the restoration circuit 1-6 first operates. The operation control function 1-4 is executed by activating a guard time set means by a timer of fault restoration operation start. The fault restoration operation is performed at a most upstream node which detects the fault.
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Citations
Patent
Communication path fault recovery system
Linwong Pinai,Kazuhiro Kusama +1 more
- 06 Mar 2008
TL;DR: In this paper, the authors propose a solution to reach fault recovery even if a one-direction link fault or a node fault may occur in a GMPLS network, where a network device which transmits and receives a control message along a communication path which has to be established within a network judges whether its own network device can detour all the fault links detected at the communication path by switching the path or not.
2
Patent
Device, system, method and program for path switchover
Ishizuka Yuichiro,Miyoshi Masaru +1 more
- 08 Aug 2016
TL;DR: In this article, a fault information receiver unit receives fault information indicative of a fault point, and a switchover target path identification unit identifies a client path passing through the fault point in which communication is disabled, as a switch over target path; switchover destination path identification units identifies a different path having a common communication device at both ends of the switchover source path and not passing through a faulty point; and a path switchover unit transmits an instruction to switch over from the source path to the destination path.