Channel unit interface circuit

Details Channel unit interface circuit Channel unit interface circuit

1987-03-03

1989-07-25

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379399, 379339, 379398, H04B 303

Patent

active

048521604

ABSTRACT:
A channel unit interface circuit for interconnecting a two-wire, bidirectional signal transmitting means and a four-wire signal transmitting means in a communication system includes a tip terminal line driver, a ring terminal line driver, a voice sense amplifier, a balance network, A/D signal processing circuit, D/A signal processing circuit, filter network, a voice codec/PCM filter, a channel logic circuit, and a DC-to-DC converter. The channel unit interface circuit is suitable for use with substantially all of the different alarm-signalling techniques utilized by the various alarm companies for connecting their equipment to a channel bank coupled to the four-wire means. The interface circuit simulates a transmission line or cable over carrier in the frequency range of DC to 3.5 KHz with an amplitude variation between +110 to -200 VDC.

REFERENCES:
patent: 4287393 (1981-09-01), Reuvekamp
patent: 4398143 (1983-08-01), Bonis
patent: 4476350 (1984-10-01), Aull et al.
patent: 4636584 (1987-01-01), Binherd et al.
patent: 4677669 (1987-06-01), Kawami et al.

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