Multiplex communications – Wide area network – Packet switching
Patent
1980-10-02
1983-07-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 32, H04B 156, H04L 514
Patent
active
043934943
ABSTRACT:
A transceiver inserted between a signal source and a two-wire or one-wire line, designed to transmit balanced or unbalanced digital signals to a remote station at the opposite end of the line while receiving similar signals from the latter station, comprises a first and a second amplifier with inputs connected to the line at a proximal and a distal end of a line-terminating impedance, respectively. Each amplifier has an inverting output connected to a noninverting output of the other amplifier, the two nodes formed between the interconnected outputs being connected to respective inputs of a differential third amplifier feeding a signal receiver. The gain of the first amplifier is half that of the second amplifier whereby the locally generated signals are suppressed in the output of the third amplifier. The several amplifiers are realized in integrated circuitry and may be provided with switches for selective changeover between a balanced and an unbalanced mode of operation.
REFERENCES:
patent: 3725582 (1973-04-01), Davis
patent: 3993867 (1976-11-01), Blood
patent: 4112253 (1978-09-01), Wilhelm
patent: 4152541 (1979-05-01), Yuen
patent: 4162371 (1979-07-01), Belforte
"A Novel High-Speed Interface Circuit Saving Wiring Equipment" by Wilhelm et al., IEEE Journal of Solid-State Circuits, vol. SC-13, No. 3, Jun. 1978, pp. 351-355.
Belforte Piero
Bortignon Renzo
Cselt Centro Studi e Laboratori Telecomunicazioni S.p.A.
Olms Douglas W.
Ross Karl F.
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