Communications system connecting circuit for controlling derivat

Details Communications system connecting circuit for controlling derivat Communications system connecting circuit for controlling derivat

1981-07-22

1984-03-13

Rubinson, G. Z.

179 70, 179170NC, H04B 158, H04M 176, H04M 1900

Patent

active

044369611

ABSTRACT:
A circuit arrangement for connecting a communications set to a subscriber line of a subscription communication network in which each subscriber line includes two wires between which the communications set is conductively connected, which arrangement includes an operational amplifier having a noninverting input, an inverting input and an output, a setting transistor connected to have its conductive state controlled by the signal at the amplifier output and connected for influencing the current flowing between the two wires of the associated line and to the communications set, and circuit elements connected for applying to the amplifier inputs respective voltages proportional to the voltage between the two wires of the associated line and proportional to the current flowing between the two wires of the associated line and to the communications set.

REFERENCES:
patent: 3899646 (1975-08-01), Cobb et al.
patent: 4322586 (1982-03-01), Mein et al.
patent: 4345117 (1982-08-01), Sweet
patent: 4357495 (1982-11-01), Sweet et al.

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