Circuit arrangement for the connection of line circuits of a dig

Details Circuit arrangement for the connection of line circuits of a dig Circuit arrangement for the connection of line circuits of a dig

1989-06-12

1990-02-06

Ng, Jin F.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379380, 379240, H04M 322, H04M 714

Patent

active

048993794

ABSTRACT:
A circuit for implementing a connection of an operational amplifier, and for achieving the switchable sensitivity of the same, as well as the in-and-out switchable filter elements, which results in a low cost, universally applicable line circuit interconnect circuit.

REFERENCES:
patent: 4099032 (1978-07-01), Roge et al.
patent: 4228536 (1980-10-01), Gueldenpfennig et al.
patent: 4297531 (1981-10-01), Dalhof et al.
patent: 4535201 (1985-08-01), Kasbia et al.
patent: 4689816 (1987-08-01), Wood

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