Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Patent
1995-04-27
1997-04-08
Safourek, Benedict V.
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
370516, 375371, H04J 307
Patent
active
056195060
ABSTRACT:
A jitter/wander reduction mechanism monitors the ratio of pulse stuffing, to detect whenever the pulse stuffing ratio is proximate a prescribed undesirable ratio of stuffs per stuffing opportunity, which causes the wander to be a large number of unit intervals. A stuffing pulse accumulator-controlled frequency shift control circuit monitors the signal produced by a multiplexer (and demultiplexer for full duplex mode) control logic circuit and incrementally adjusts, as necessary, the frequency of a synchronized clock signal input to the multiplexer (and demultiplexer). The magnitude of the incremental frequency shift is sufficient to drive the synchronized clock away from the frequency associated with the undesired stuff ratio to a frequency that is sufficiently separated from the undesired value to produce a stuffing ratio other than the undesired value and reduce the jitter/wander.
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patent: 4791652 (1988-12-01), McEachern et al.
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Burch Richard A.
Schneider Kevin W.
Turner Michael D.
Adtran Inc.
Ngo Ricky
Safourek Benedict V.
Wands Charles E.
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