Analog/digital telecommunication subscriber station

Details Analog/digital telecommunication subscriber station Analog/digital telecommunication subscriber station

1981-10-07

1984-05-15

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 76, H04J 108

Patent

active

044492189

ABSTRACT:
An analog/digital telecommunication subscriber station is connectible to a two-wire line and comprises a frequency multiplexer and a frequency demultiplexer for grouping and fanning an analog communication channel covering the telephone band and a digital communication channel lying above the telephone band. The station further comprises a hybrid for connecting the two-wire line into a four-wire line. The subscriber station is particularly characterized in that the two-wire line is terminated by a broad-band hybrid which is proceeded in the transmission branch by a frequency multiplexer which groups at least the analog communication channel covering the telephone band and the digital communication channel lying thereabove, and is followed in the receiving branch by a frequency demultiplexer which fans at least the analog communication channel covering the telephone band and the digital communication channel lying above the telephone band. Various embodiments provide analog telephone operation, digital telephone operation, fast data operation, slow data operation, picture telephone service and a combination of analog and digital two-party line as various options.

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patent: 3909559 (1975-09-01), Taylor
patent: 4375015 (1983-02-01), Chambers
IBM Technical Disclosure Bulletin, vol. 19, No. 7, Dec. 1976, "Hybrid Transmission System for Functional Digital Telephones", by Esteban, pp. 2571-2572.
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Gerke P. et al., "DTN, An All Digital Telephony Network . . . ", ISS '79, Session 40A: Communication of Data, pp. 773, 780.
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