Multiplexer for bit oriented protocol data link control

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

1984-02-21

1985-07-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370112, H04J 306, H04J 304

Patent

active

045312117

ABSTRACT:
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.

REFERENCES:
patent: 4161719 (1979-07-01), Parikh et al.
patent: 4196315 (1980-04-01), Boutmy et al.
patent: 4225919 (1980-09-01), Kyu et al.
patent: 4423414 (1983-12-01), Bryant et al.

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