Bi-directional signaling apparatus

Details Bi-directional signaling apparatus Bi-directional signaling apparatus

1976-02-23

1976-12-21

Robinson, Thomas A.

Telegraphy

Systems

Printing

H04L 2502

Patent

active

039990133

ABSTRACT:
A solid-state sensor for use in the front end of a DX (Duplex) signaling unit to monitor signals on A and M leads and output signals on an E lead for transmission to a single frequency signaling unit (SFSU) or other E&M signal devices. This circuit replaces a polarized, bridge configured relay normally used for this application in communication circuits.

REFERENCES:
patent: 3588622 (1971-06-01), Mankowski, Jr. et al.
patent: 3967059 (1976-06-01), Moore et al.
patent: 3970784 (1976-07-01), Meijerink

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