Two-way signal transmission and one-way DC power supply using a

Details Two-way signal transmission and one-way DC power supply using a Two-way signal transmission and one-way DC power supply using a

1981-04-22

1984-05-22

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 36, 370 24, H04L 514

Patent

active

044505710

ABSTRACT:
A signal transmission system which perform two-way signal transmission between a first transmitter-receiver and a second transmitter-receiver via a pair of signal lines and supplies a DC current from the first transmitter-receiver to the second transmitter-receiver. In each of the first transmitter-receiver and the second transmitter-receiver, there are provided a current varying circuit for varying a signal line current by a transmission pulse signal so that the signal line current may assume a value in a predetermined current region lower than a minimum level of a load current to the other transmitter-receiver during sending out a signal pulse, a current detector for detecting a current or voltage variation in the signal line current, and a gate circuit for blocking the detected output from the current detector while the transmission pulse is sending out to the current varying circuit.

REFERENCES:
patent: 3540049 (1970-11-01), Gaunt, Jr.
patent: 3786418 (1974-01-01), Nick
patent: 3843834 (1974-11-01), Burke
patent: 3967058 (1976-06-01), Moriya et al.
patent: 3983482 (1976-09-01), Doherty
patent: 4086534 (1978-04-01), Olson
patent: 4106104 (1978-08-01), Nitta et al.
patent: 4317205 (1982-02-01), Lam
patent: 4328586 (1982-05-01), Hansen

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