Multiplex communications – Fault recovery
Patent
1997-09-05
2000-12-26
Vu, Huy D.
Multiplex communications
Fault recovery
370217, G01R 3108
Patent
active
061670251
ABSTRACT:
Methods and apparatus for detecting faults and restoring connections in networks including, e.g., ATM networks are described. The restoration methods of the present invention can be applied on an application by application or user by user basis. In accordance with the present invention virtual connections affected by link or node failures are restored through re-routing as opposed to establishing a completely new connection between a source and a destination device. VPI/VCI values are assigned at the time of re-routing thereby avoiding the potential problem of VPI/VCI exhaustion which may be encountered when backup VPI/VCI values are assigned at the time a communication session is initiated. The connection restoration process of the present invention is initiated by a node on the source side of a connection detecting a failure and initiating a re-routing operation or transmitting a message to the source switch to initiate a re-routing operation. A node on the destination device side of a failed connection is used for initiating the release of network resources reserved at the switches which were used as part of the no longer used path of the re-routed call. The destination device side node (switch) detecting a fault transmits a re-route release message to downstream switches. Restoration methods applicable to pre-planned hop-by-hop, pre-planned source routing and dynamic source routing embodiments are described. In one embodiment, ATM assured mode data transport operation on signaling channels is used to detect node and/or link failures.
REFERENCES:
patent: 4884263 (1989-11-01), Endo et al.
patent: 5590118 (1996-12-01), Nederlof
patent: 5764624 (1998-06-01), Endo et al.
"Fast Restoration of ATM Networks", Jon Anderson, Bharat T. Doshi, Subrahmanyam Dravida and P. Harshavardhana IEEE Journel on Selected Areas in Communications, vol. 12, No. 1, Jan. 1994, pp. 128-138.
"Self-Healing ATM Network Techniques Util.izing Virtual Paths", R. Kawamura, K. Sato, and I. Tokizawa, Fifth International Network Planning Symposium, Network Planning for an Open Era, Kobe, Japan, May 17-22, 1992, pp. 129-134.
"Broadband Integrated Services Digital Network (B-ISDN), Signalling System No. 7 B-ISDN User Part (B-ISUP), Formats and Codfes, Q.2763", International Telecommunication Union, Telecommunication Standardiszation Sector, Study Period 1993-1996.
"Private Network-Network Interface, Specification Version 1.0 (PNNI 1.0)", The ATM Forum, Technical Committee, Mar. 1996.
"Distributed Control Algorithm for Dynamic Restoration in DCS Mesh Networks, Performance Comparison",Bellcore Technical Memorandum, TM-NWT-021979, Dec. 1992.
A Restoration Methodology Based on Preplanned Source Routing in ATM Networks, D-P K. Hsing, B-C Cheng, G. Goncu, L. Kant, Bellcore paper.
Cheng Bo-Chao
Goncu Yusuf Goksel
Hsing Deh-phone K.
Kant Latha
Wu Tsong-Ho
Boakye Alexander
Telcordia Technologies Inc.
Vu Huy D.
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