Variable rate synchronous digital transmission system

Details Variable rate synchronous digital transmission system Variable rate synchronous digital transmission system

1978-12-29

1980-07-29

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

375120, 371 47, H04L 702

Patent

active

042152453

ABSTRACT:
A synchronous digital transmission system (12), operating over a prescribed range of bit rates, is interfaced with subscribers (10, 11) whose data sources and receivers have different bit rates by means of transmitter and receiver interface networks (13, 14). The transmitter interface network (13) comprises means (20, 21, 23, 24) for phase-locking an integral subharmonic f.sub.o /N of a variable frequency oscillator (22) to an input clock signal, f.sub.1, associated with an input data stream, and means (25, 27) for encoding the data stream for operation at a bit rate corresponding to the fundamental frequency, f.sub.o, of the local oscillator (22) and including one code violation at a prescribed rate, f.sub.1 /M, related to the input clock frequency f.sub.1. The receiver interface network (14) includes means (30, 31, 32) for decoding the received signal and for recovering the input data stream and clock signal.

REFERENCES:
patent: Re29215 (1977-05-01), Carney
patent: 3548309 (1970-12-01), Saltzberg
patent: 3665405 (1972-05-01), Sanders
patent: 3809820 (1974-05-01), Sullivan
patent: 3909791 (1975-09-01), van den Berg

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