Multiplex communications – Wide area network – Packet switching
Patent
1981-12-24
1984-02-14
Brigance, Gerald L.
Multiplex communications
Wide area network
Packet switching
370 29, 179 18AD, H04J 300, H04M 906
Patent
active
044320892
ABSTRACT:
In a digital telephone system, a digital private automatic branch exchange (PABX) has a plurality of digital line cards for coupling the PABX to respective digital subscriber sets via subscriber lines. In each digital line card, a digital loop transceiver operates in a master mode to couple the digital data bus of the PABX to the subscriber line via a subscriber line interface circuit in response to control signals provided by the PABX on the control bus thereof. In each digital subscriber set, a digital loop transceiver operates in a slave mode to couple the subscriber set to the subscriber line via a subscriber line interface circuit and to provide the several control signals required by the other components thereof. The digital loop transceivers provide communication on each of two communication channels, with the digital data words of the first channel being treated the same as the digital data words of the second channel.
REFERENCES:
patent: 3924077 (1975-12-01), Blakeslee
patent: 3978290 (1976-08-01), Sarma
patent: 4145574 (1979-03-01), Wintzer
patent: 4281410 (1981-07-01), Agricola et al.
International Conference on Communications, IEEE, Jun. 1980, Desikan and Warner, "A Data Switching Technique for a Digital PABX".
Kelley Stephen H.
Wurzburg Henry
Brigance Gerald L.
King Robert L.
Motorola Inc.
Myers Jeffrey Van
Sarli, Jr. Anthony J.
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