Tandem connection maintenance system

Details Tandem connection maintenance system Tandem connection maintenance system

1994-03-16

1996-09-10

Beausoliel, Jr., Robert W.

Excavating

371 201, 371 491, 370 14, G06F 1100

Patent

active

055552480

ABSTRACT:
A method and apparatus for detecting the presence or absence of errors caused along a designated section of a virtual path established within a communication network. The number of errors is detected at both the entrance and exit of a detection section. The number of errors detected at the entrance is transmitted to the exit by using a path overhead of a virtual path to be monitored, and the number of errors at the entrance is subtracted from the number of errors at the exit, thereby calculating the number of errors caused along the detection section. The path overhead containing data on the detected error count includes a parity compensation bit that is set so that the parity carried in the path overhead remains unchanged. This eliminates the need to recalculate bit interleave parity-2 for the virtual path under monitoring.

REFERENCES:
patent: 4964112 (1990-10-01), Appelmann
patent: 5251204 (1993-10-01), Izawa et al.
patent: 5313453 (1994-05-01), Uchida et al.
Klein, M. J., "The Synchronous Digital Hierarchy: Principles, Variants and Applications", Phillips Telecomm. Review, vol. 48, No. 4, Dec. 1990, pp. 20-27.
Wiechers, R., "Synchronous Digital Hierarchy: A new standard is changing the world", Funkschau 14/1991, pp. 56-62.

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