Multiplex communications – Wide area network – Packet switching
Patent
1981-12-23
1984-09-11
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 300
Patent
active
044714807
ABSTRACT:
A common controller in the form of a programmed digital sequencer executes a series of instructions to control multiplexing-demultiplexing overhead channel format generation, frame synchronization stuff-destuff operation and automatic channel assignment in a digital TDM multiplexer-demultiplexer combination at one communication terminal to enable multiplexing N input data signals each having a predetermined bit rate into a transmitted synchronous data stream having a predetermined fixed data format and a given bit rate greater than the sum of the predetermined bit rates and to demultiplex N output data signals each having the predetermined bit rate from a received synchronous data stream having the data format and the given bit rate, where N is an integer greater than one. The disclosed common controller can be used with synchronous input and output data signals or for asynchronous input and output data signals wherein the asynchronous input and output data signals are distributed throughout the fixed data format in the time slots thereof evenly due to the automatic channel assignment. The programmed digital sequencer includes program memory means and support logic means coupled to the memory means to supply control signals in response to a plurality of digital codes present in the program memory means for multiplexing, demultiplexing, overhead channel format generation frame synchronization, stuff-destuff control and automatic channel assignment.
REFERENCES:
patent: 3982074 (1976-09-01), Clark
patent: 3982077 (1976-09-01), Clark et al.
patent: 4143246 (1979-03-01), Smith
patent: 4206322 (1980-06-01), Lurtz
patent: 4313193 (1982-01-01), Nakano et al.
"Code and Speed Dependent TDM System 3TR1600 for Telegraph and Data Transmission," by R. Bodart et al., Nov. 1978, pp. 197-209, Philips Telecommunications Review.
Bandini Arthur L.
Cohen Stuart B.
Haussmann Robert H.
Chin Wellington
Hill Alfred C.
International Telephone and Telegraph Corporation
O'Halloran John T.
Olms Douglas W.
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