Line interface circuit

Details Line interface circuit Line interface circuit

1985-08-12

1987-04-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 15, 375 7, H04L 124

Patent

active

046566430

ABSTRACT:
A line interface circuit for connecting the transmit and receive ports of a transmitter to transmit lines (LX) and receive lines (LR), respectively. The interface circuit includes a transistorized differential amplifier provided with two load circuits comprising resistors and diodes connected in series, and logic control means for selectively switching power to either load circuit. One of the load circuits drives the transmit line (LX) while the other drives the receive ports of the transmitter. Switching the load circuits makes it possible to use the interface circuit either to drive the transmit line (LX) or to loop the output signal from the transmitter back to the receive input thereof, while loading the transmit line (LX) with its characteristic impedance.

REFERENCES:
patent: 3655915 (1972-04-01), Liberman et al.
patent: 4271513 (1981-06-01), Maejima et al.
patent: 4529979 (1985-06-01), Kusama et al.
patent: 4538026 (1985-08-01), Yasue

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