Multiplex communications – Wide area network – Packet switching
Patent
1993-09-27
1994-05-10
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701053, 370108, 375118, H04J 1408
Patent
active
053115112
ABSTRACT:
A SONET/DS-N desynchronizer and method for receiving an incoming stream of SONET (Synchronous Optical NETwork) data, having a controller for controlling either a direct digital synthesis circuit that provides a desynchronized clock for smoothly adapting the rate at which data is retrieved from a data buffer to the rate at which the incoming SONET data is stored in the data buffer. To minimize jitter and buffer spills (i.e., data overruns or underruns), the frequency and phase of the desynchronized clock is constantly varied to match the variations of the data rate of incoming SONET data. The DDS circuit generates the desynchronized clock, which has a center frequency equal to a predetermined frequency of a reference clock, whose phase is advanced or retarded in accordance with the magnitude of a tuning word supplied by a controller, which implements either a linear, non-linear, or fuzzy logic control algorithm. The controller periodically updates the tuning word in response to status variables to adjust the frequency of the clock output of the DDS circuit. In an alternative embodiment, a digital voltage controlled oscillator is used in place of the DDS circuit.
REFERENCES:
patent: 4191976 (1980-03-01), Braun
patent: 4792914 (1988-12-01), Dartois et al.
patent: 4811340 (1989-03-01), McEachern et al.
patent: 4920547 (1990-04-01), Murakami
patent: 4928275 (1990-05-01), Moore et al.
patent: 4933890 (1990-06-01), Nuytkens et al.
patent: 4941156 (1990-07-01), Stern et al.
patent: 4975699 (1990-12-01), Frey
patent: 4996698 (1991-02-01), Nelson
patent: 5008900 (1991-04-01), Critchlow et al.
patent: 5157655 (1992-10-01), Hamlin, Jr. et al.
Broughton Robert S.
Delgadillo David
Reilly Brian F.
Smith Jeremy
Marcelo Melvin
NEC America Inc.
Olms Douglas W.
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