Frame synchronizer for detecting misframes with different shift

Details Frame synchronizer for detecting misframes with different shift Frame synchronizer for detecting misframes with different shift

1989-08-11

1991-05-07

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701001, 3701051, 375114, 375116, H04J 306

Patent

active

050142720

ABSTRACT:
A frame synchronizer is adapted to receive an incoming high-speed TDM (time division multiplex) signal of a framed structure containing, at frame intervals, a sequence of identical synchronization bit patterns and a sequence of byte-length data signals. A demultiplexer decomposes the high speed TDM signal into the synchronization bit patterns and the byte-length data signals and supplies them as low-speed frames to output ports. A plurality of bit pattern detectors are provided for respectively detecting different bit patterns which are successively obtained from the decomposed synchronization bit patterns when timing of the demultiplexer is successively delayed or advanced with respect to the incoming TDM signal. Each of the different bit patterns is an n-bit shifted version of the decomposed synchronization bit patterns, where n is an integer representing the amount of the delay or advance. In accordance with the detected different bit patterns, the timing of the demultiplexer is controlled.

REFERENCES:
patent: 3662114 (1972-05-01), Clark
patent: 3909541 (1975-09-01), Bobilin
patent: 4602367 (1986-07-01), McDermott, III
patent: 4748623 (1988-05-01), Fujimoto
patent: 4835768 (1989-05-01), Hubbard et al.
patent: 4847877 (1989-07-01), Besseyre

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