Drop-and-insert multiplex digital communications system

Details Drop-and-insert multiplex digital communications system Drop-and-insert multiplex digital communications system

1981-12-07

1984-08-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 85, H04J 308

Patent

active

044687672

ABSTRACT:
Apparatus for dropping and inserting digital data in a time division multiplexed, serial data stream. A communications link is divided into two spans with an electrical switch connecting the two spans. Data is used to derive channel-timing information defining the time divisions or strobes of each of the multiplexed channels. The strobe pulses are used to toggle the switch so that local transmit-and-receive channels may be inserted and dropped in accord with the channel strobe pulses. The same channel strobe pulses used for transmitting local data are used for receiving data from the multiplexed bit stream. In the absence of channel strobe pulses, the switch connects the two links.

REFERENCES:
patent: 2740838 (1956-04-01), Pierce
patent: 3665405 (1972-05-01), Sanders et al.
patent: 4002846 (1977-01-01), Barbier
patent: 4090035 (1978-05-01), Popkin
patent: 4121054 (1978-10-01), Popkin
patent: 4393492 (1983-07-01), Bishop
patent: 4434485 (1984-02-01), Huffman et al.
Telecommunications, Sep. 1973, pp. 44-44, "Single Channel Drop and Insert", by Canadian Marconi Co.

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