Demultiplexer for bit oriented protocol data link control

Details Demultiplexer for bit oriented protocol data link control Demultiplexer for bit oriented protocol data link control

H - Electricity

04

J

363/10

H04J 3/02 (2006.01) H04L 29/06 (2006.01) H04L 29/08 (2006.01)

Patent

CA 1229435

DEMULTIPLEXER FOR BIT ORIENTED PROTOCOL DATA LINK CONTROL Abstract of the Disclosure A bit oriented protocol (e.g. HDLC) data link control multiplexer and demultiplexer are described for handling 256 channels whose data are time division multiplexed in pairs of bits in a serial data stream. The multiplexer and demultiplexer relieve a processor of an associated telephone or packet data switching office from the tasks of multiplexing and demultiplexing, formatting data link control frames, providing CRC checks, and inserting and removing zero bits to distinguish messages from flag bytes. The multiplexer and demultiplexer each include several shift registers for the serial bit stream information, byte boundary indication, CRC data, and effecting zero bit insertion and removal. - i -

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