Communication system

Details Communication system Communication system

1990-06-14

1992-09-08

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Substation originated

379355, 379413, H04M 127

Patent

active

051464934

ABSTRACT:
A communication system receives data from a portable device without using a conductor. The data-receiving side obtains electric power from the outside. The portable device obtains electric power from its internal power supply or the data-transmitting side.

REFERENCES:
patent: 4126768 (1978-11-01), Gruzow
patent: 4630201 (1986-12-01), White
patent: 4914691 (1990-04-01), Berger

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