Multiplex communications – Wide area network – Packet switching
Patent
1986-05-16
1988-01-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, 370112, H04J 312, H04J 304
Patent
active
047196246
ABSTRACT:
A synchronous PCM digital transmission system including multilevel multiplexing wherein the higher order multiplexers interleave two or more tributary signals each of which comprises a multiplexed plurality of subtributaries. Multiplexer framing is achieved by means of an auxiliary frame pattern or byte, F.sub.T, which is slidable within the subscriber-defined frames. Each multiplexer in the system re-frames or slides F.sub.T and its associated overhead so that the F.sub.T bytes at each multiplexer are synchronized. The F.sub.T bytes can be used to frame or synchronize scrambling and de-scrambling circuitry. This concept provides multiplexer framing and yields high-speed multiplexed signals which are all exact multiples of the system clock rate, using relatively simple circuitry compared to competitive designs.
REFERENCES:
patent: 3707604 (1972-12-01), Greefkes et al.
patent: 3794768 (1974-02-01), Cichetti, Jr. et al.
patent: 3995119 (1976-11-01), Packynski, Jr.
patent: 3995120 (1976-11-01), Pachynski, Jr.
"Synchronous Optical Network (SONET)," Bell Communications Research Technical Advisory, TA-TSY-000253, Apr. 1985.
"Synchronous Optical Network (SONET)," Globecom, R. J. Boehm, Y. C. Ching, R. C. Sherman, 1985, pp. 1443-1450.
Bell Communications Research Inc.
Chin Wellington
Falk James W.
Gurey Stephen M.
Olms Douglas W.
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