Fault communication for network distributed restoration
First Claim
1. At a node of a telecommunications network along a service path satisfying a demand from a start node to an end node, a method for detecting a failure in the service path, comprising the steps of:
- (a) receiving, at the node, incoming payload signals from its previous node along the service path;
(b) monitoring, at the node, the incoming payload signals for a loss-of-signal (LOS) condition to detect at the node the failure in the service path;
(c) monitoring, at the node, the incoming payload signals for an in-band alarm indication signal to detect at the node the failure in the service path; and
(c) monitoring, at the node, an out-of-band signaling channel for a failure message transmitted from its previous node along the service path to detect at the node the failure in the service path.
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Accused Products
Abstract
In a telecommunications network, such as an optical mesh network, at a node along a service path satisfying a demand from a start node to an end node, the node can detect a failure in the service path by any of three different ways: (a) by monitoring incoming payload signals from its previous node along the service path for a loss-of-signal (LOS) condition; (b) by monitoring the incoming payload signals from its previous node along the service path for an in-band alarm indication signal; and (c) by monitoring an out-of-band signaling channel for a failure message transmitted from its previous node along the service path. The node then determines appropriate actions as part of a distributed restoration procedure depending on whether the node is an intermediate node or the end node along the service path. If the node is an intermediate node, then the node passes the out-of-band failure message to its next node along the service path. If the nod is the end node, then the node transmits an out-of-band restore message to its previous node along the corresponding restoration path. In both cases, the node proceeds to reconfigure its cross-connect for the transition from the service path to the restoration path.
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Citations
16 Claims
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1. At a node of a telecommunications network along a service path satisfying a demand from a start node to an end node, a method for detecting a failure in the service path, comprising the steps of:
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(a) receiving, at the node, incoming payload signals from its previous node along the service path;
(b) monitoring, at the node, the incoming payload signals for a loss-of-signal (LOS) condition to detect at the node the failure in the service path;
(c) monitoring, at the node, the incoming payload signals for an in-band alarm indication signal to detect at the node the failure in the service path; and
(c) monitoring, at the node, an out-of-band signaling channel for a failure message transmitted from its previous node along the service path to detect at the node the failure in the service path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A node for a telecommunications network, comprising:
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(a) a cross-connect connected to a plurality of input ports and a plurality of output ports and configurable to connect incoming signals received at an input port to outgoing signals transmitted at an output port; and
(b) an operating system configured to control operations of the node, wherein;
the node is configured to receive incoming payload signals from its previous node along a service path for a demand;
the node is configured to monitor the incoming payload signals for a loss-of-signal (LOS) condition to detect at the node a failure in the service path;
the node is configured to monitor the incoming payload signals for an in-band alarm indication signal to detect at the node the failure in the service path; and
the node is configured to monitor an out-of-band signaling channel for a failure message transmitted from its previous node along the service path to detect at the node the failure in the service path. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification
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- Resources
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Current AssigneeLucent Technologies, Inc. (Nokia Corporation)
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Original AssigneeLucent Technologies, Inc. (Nokia Corporation)
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InventorsZhang, Liyan, Korotky, Steven K., Tentarelli, Eric S., Agrawal, Niraj, Jackman, Neil A., Lee, Byung H.
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Application NumberUS09/755,615Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current370/217CPC Class CodesH04B 10/03 Arrangements for fault reco...H04B 10/0793 Network aspects, e.g. centr...H04J 14/0227 Operation, administration, ...H04J 14/0241 Wavelength allocation for c...H04J 14/0284 WDM mesh architecturesH04Q 11/0062 Network aspectsH04Q 2011/0081 Fault tolerance; Redundanc...H04Q 2011/0088 Signalling aspects
