Telecommunication line circuit

Details Telecommunication line circuit Telecommunication line circuit

1986-04-16

1989-06-06

Ng, Jin F.

Telephonic communications

Centralized switching system

With generating of call associated substation signal

379382, 379405, H04M 327, H04M 1902

Patent

active

048378186

ABSTRACT:
Telecommunication line circuit including a Herter bridge with a first pair of terminals coupled to a bidirectional 2-wire line, a second pair of terminals coupled to an exchange, and a third pair of terminals where longitudinal currents are eliminated from sensed signals, as well as a ringing generator that may be coupled across the second pair of terminals which is coupled to a receive leg of a 4-wire exchange circuit and, through switching means to a ringing generator while the third pair of terminals is coupled to a transmit leg of the 4-wire exchange circuit.

REFERENCES:
patent: 3622709 (1971-11-01), Tjaden
patent: 4317963 (1982-03-01), Chea, Jr.
patent: 4396805 (1983-08-01), Wagner
patent: 4514595 (1985-04-01), Rosenbaum et al.
patent: 4532381 (1985-07-01), Rosenbaum et al.
patent: 4539438 (1985-09-01), Rosenbaum et al.
patent: 4540852 (1985-09-01), Albouy et al.
patent: 4598173 (1986-07-01), Chea, Jr. et al.
AM 7950, Advanced Micro Devices, Advanced Information Jun. 1984, Sep. 1985.
IBM Technical Disclosure Bulletin, "Trip Detecting Circuit" by M. Ferry vol. 20, No. 3, Aug. 1977 (pp. 1045-1046).
Electrical Communication, vol. 44, No. 4, 1969, "Balanced Electronic Receiver for Loop Signaling" (pp. 340-347).

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