Pulse or digital communications – Repeaters – Testing
Patent
1980-09-26
1983-03-01
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
34082503, 34082508, 34082552, 370 691, 370 90, 455 31, 455 77, 455131, 455 58, H04B 350
Patent
active
043756913
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: 2686257 (1954-08-01), Reichle
patent: 3808537 (1974-04-01), Sarati et al.
patent: 3821706 (1974-06-01), Bennett et al.
patent: 3990046 (1976-11-01), Katz et al.
patent: 4013957 (1977-03-01), Tojo
patent: 4028500 (1977-06-01), McClure et al.
patent: 4035727 (1977-07-01), Ishii
patent: 4130733 (1978-12-01), Ashford
patent: 4293948 (1981-10-01), Soderblom
Minnesota Mining & Manufacturing Co.
Safourek Benedict V.
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