Apparatus and method for detection of operation administration a

Details Apparatus and method for detection of operation administration a Apparatus and method for detection of operation administration a

1995-12-15

1997-08-19

Olms, Douglas W.

Multiplex communications

Diagnostic testing

Loopback

H04J 314

Patent

active

056595409

ABSTRACT:
A method for identifying and declaring a physical loopback condition upon running an OAM loopback test is provided. The method modifies ITU-T Recommendation I.610. According to the method, an OAM loopback test cell is generated with a correlation tag and a loopback indication value representing an outbound (forward) test cell, with the correlation tag being stored. Upon receiving back an OAM loopback test cell, the value of the loopback indication is determined, and the correlation tag of the incoming OAM loopback test cell is compared with the stored correlation tag. If the correlation tags match and the value of the loopback indication represents a forward test cell, a physical loopback condition is declared. On the other hand, if the correlation tags match and the value of the loopback indication represents a backward test cell, a successful OAM loopback condition is declared. An apparatus including a memory, a management processor, and a header processor for implementing the method of the invention is also disclosed.

REFERENCES:
patent: 5166923 (1992-11-01), Ohmori et al.
patent: 5265088 (1993-11-01), Takigawa et al.
patent: 5313453 (1994-05-01), Uchida et al.
ITU-T 1.610 (Nov. 1995) B-ISDN Operation and Maintenance Principals and Function.

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