Multiplex communications – Wide area network – Packet switching
Patent
1982-09-27
1983-12-13
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 24, 370 92, 370100, H04J 400, H04J 600
Patent
active
044208316
ABSTRACT:
A digital communications system includes a plurality of master stations communicating with a plurality of terminals over a single communication line which carries a plurality of duplex communication channels, each corresponding to a particular master station. A frequency translator coupling each terminal with the communication line permits the remote station to selectively communicate over any of the channels by translating the frequency of a selected channel to that of the terminal's receiver and by translating the frequency of the terminal's transmitter to that of the selected channel. Upon selection of a particular channel, the terminal's transmitter is disabled for a duration sufficient to allow its receiver to pick up a resynchronization signal periodically sent out by the master station whose channel has been selected. The receiver then enables the transmitter in synchronism with any other terminals using the same channel. The translator employs a pair of multiple frequency oscillators controlled by a counter whose output corresponds to a selected channel. The counter is advanced by a manually operable switch, or alternatively, by a remotely generated digital word.
REFERENCES:
patent: 3821479 (1974-06-01), Campbell
patent: 3821706 (1974-06-01), Bennett et al.
patent: 3882538 (1975-05-01), Lowe
"6.312 Mb/s PCM-FDM Transmission System", by Ogawa et al., Review of the Electrical Communication Laboratories, vol. 26, No. 3-4, Mar.-Apr., 1978, pp. 526-538.
Minnesota Mining & Manufacturing Co.
Olms Douglas W.
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