Defect notification method in a multipoint ATM network

Details Defect notification method in a multipoint ATM network Defect notification method in a multipoint ATM network

1995-03-15

1997-05-06

Marcelo, Melvin

Multiplex communications

Diagnostic testing

Fault detection

370248, 370307, H04L 100

Patent

active

056278217

ABSTRACT:
A defect notification method and apparatus for use in a multipoint ATM network so as to avoid the transmission of defect notification cells in an overlapped manner. In the invention when a connecting point detects a defect in a lower layer and when the connecting point is not a branching point the connecting point sends a first defect notification signal in the downstream direction of a first connection. When the connecting point receives the first defect notification signal and when the connecting point is a branching point, the connecting point terminates the first defect notification signal, sends a quasi-defect notification signal in the downstream direction of the first connection, and returns a second defect notification signal in the downstream direction of a second connection in the opposite direction of the first connection. Connecting points in the downstream direction of the first connection transfer the quasi-defect notification signal in the downstream direction of the first connection without processing and end points, upon receiving the quasi-defect notification signal, execute a predetermined state transition.

REFERENCES:
patent: 5233600 (1993-08-01), Pekarske
patent: 5321688 (1994-06-01), Nakano et al.
International Telegraph & Telephone Consultative Committed/COM XVIII-R 122-E, "Study Group XVIII -Report R 122", Jul. 1992, Period 1989-1992.
ITU-T Recommendation 1.361, Integrated Servies Digital Network (ISDN) (Mar. 1993).

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