Circuit arrangement for receiving simplex and duplex current tel

Details Circuit arrangement for receiving simplex and duplex current tel Circuit arrangement for receiving simplex and duplex current tel

1979-02-15

1980-11-04

Robinson, Thomas A.

Multiplex communications

Wide area network

Packet switching

H04L 514

Patent

active

042321883

ABSTRACT:
A circuit arrangement for receiving simplex current and duplex current telegraph characters utilizes a series resistance in each of a plurality of telegraph lines. An operational amplifier is connected via switches to read the voltage drop across the line resistances and to signal such line conditions to an output circuit. The output circuit comprises a first differentiating circuit which passes the line conditions onto a bistable flip-flop, a monostable flip-flop operated by the first differentiating circuit to provide a timed trigger to a second differentiating circuit which triggers the bistable flip-flop into a condition indicative of the condition of the telegraph line being read.

REFERENCES:
patent: 3843834 (1974-10-01), Burke
patent: 3999013 (1976-12-01), Reed et al.
patent: 4024501 (1977-05-01), Herring et al.
patent: 4032911 (1977-06-01), Melvin, Jr.

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