Excavating
Patent
1994-08-23
1997-05-06
Nguyen, Hoa T.
Excavating
371 51, 370217, G06F 1100
Patent
active
056278373
ABSTRACT:
A method and system for performing protection switching in a communications system is disclosed. The disclosed system and method include the ability to detect bit error burst conditions, in which data is highly errored over a brief time and responsive to which the protection switching procedure is not desired. The number of bit errors over a series of sample periods are counted, and the number of errors detected in each sample period is compared against a burst error threshold. A carryover value from the prior sample period (e.g., the number of detected errors above average) is preferably added to the detected errors in the current sample period prior to the comparison, so that error bursts are detected regardless of their alignment with the sample periods. Upon detection of a burst condition, the number of errors for the current sample period is reduced to the running average of errors for the preceding sample periods in a detection window, prior to comparing the errors detected over the detection window against a protection switching error threshold value.
REFERENCES:
patent: 5159665 (1992-10-01), Priem et al.
patent: 5271011 (1993-12-01), McMullan et al.
patent: 5329520 (1994-07-01), Richardson
Alcatel Network Systems, Inc.
Chung Phung My
Nguyen Hoa T.
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