Digital transmission system

Details Digital transmission system Digital transmission system

1987-04-13

1988-11-29

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375114, H04J 306

Patent

active

047886811

ABSTRACT:
A terminal for a telephone system and for receiving digital data in the form of a time multiplexed (TDM) data stream incorporating frames appearing at a predetermined frame period and each frame incorporating a frame word. The terminal comprises a frame word detecting circuit (52) for detecting frame words; an alignment detecting circuit (53, 55, 56) for determining whether a received TDM data stream is in alignment or not; a search circuit (53, 55, 56, 57, 59, 60) for initiating a bit-by-bit search of the incoming data stream for the sequence of bits forming the frame word when an "out-of-alignment " condition has been detected by the said alignment detecting circuit; and a delay circuit (58) for delaying the start of the bit-by-bit search after an "out-of-alignment" condition has been detected.

REFERENCES:
patent: 3985967 (1976-10-01), Colton et al.
patent: 4594708 (1986-06-01), Servel et al.
patent: 4596981 (1986-06-01), Ueno et al.
patent: 4602369 (1986-07-01), McDermott, III
patent: 4651319 (1987-03-01), Bowlds
patent: 4674088 (1987-06-01), Grover
patent: 4698806 (1987-10-01), Graves et al.

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