Synchronous digital signal to asynchronous digital signal desync

Details Synchronous digital signal to asynchronous digital signal desync Synchronous digital signal to asynchronous digital signal desync

1990-08-24

1991-09-24

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

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328 55, 369 60, 370 49, H04L 704

Patent

active

050520253

ABSTRACT:
Improved jitter performance is realized in a desynchronizer for obtaining an asynchronous digital signal, e.g., a DS3 signal, from a received synchronous digital signal, e.g., a SONET STS-1 signal. The improved jitter performance results from the use of a unique adaptive bit leaking arrangement in conjunction with a digital phase locked loop and synchronizing elastic store. An estimate of a bit leaking interval is adaptively obtained based on the intervals between a sequence of consecutive pointer adjustments in the received signal, i.e., the STS-1 signal. In one embodiment, the bit leaking interval estimate is obtained by employing a moving average of the intervals between the pointer adjustments. The desired bit leaking is effected by employing an accumulator which is responsive to the received pointer adjustments and a representation of the estimated bit leaking interval, in conjunction with a comparator. The accumulator output count is supplied to the comparator along with the current write address of the elastic store. Leak bits are supplied as an output from the comparator one at a time to the phase locked loop which, in turn, generates a smooth read clock for the elastic store.

REFERENCES:
patent: 4525849 (1985-06-01), Wolf
patent: 4761800 (1988-08-01), Lese et al.
patent: 4899352 (1990-02-01), Cucchi et al.
patent: 4928275 (1990-05-01), Moore et al.
Contribution to T1 Standards Project--T1X1.4, "Effects of Pointer Manipulations on Network Wander Characteristics", Malcolm Betts, Northern Telecom Incorporated, T1X1.4/87-402, Dec. 17, 1986.
Contribution to T1 Standards Project, T1X1.6/88-026, "A Synchronous Desynchronizer", Sabit Say, Bellcore, Jul. 25, 1988.
Contribution to T1 Standards Project, T1X1.6/89-012, "Sonet Desynchronisers", Andy Reid, British Telecom, Feb. 8, 1989.

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