Pulse or digital communications – Testing – With indicator
Patent
1995-02-13
1996-04-09
Chin, Stephen
Pulse or digital communications
Testing
With indicator
371 55, 371 572, H04B 1700, H04Q 120
Patent
active
055068707
ABSTRACT:
A method of detecting whether a valid DS1 signal is being received by a receiver. If the receiver does not have a valid signal (loss of signal), then the receiver reads consecutive fixed sized N bit blocks of the received digital signal. Each of the blocks or windows is checked for minimum 1s density. Received consecutive 0s are counted and checked against a maximum. If two sequential blocks of bits satisfy the 1s and consecutive 0s tests, then the received signal is judged valid and an acquisition of signal flag is asserted.
REFERENCES:
patent: 4161719 (1979-07-01), Parikh et al.
patent: 4442520 (1984-04-01), Ive et al.
patent: 4747112 (1988-05-01), Blondeau et al.
patent: 4864158 (1989-09-01), Koelle et al.
Brauns Gregory T.
Ramachandran Ramasubramaniam
AT&T Corp.
Chin Stephen
McLellan S. W.
Urbano M. J.
Vo Don N.
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