Telephone line circuit and system

Details Telephone line circuit and system Telephone line circuit and system

1983-01-10

1984-06-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

179 16AA, H04Q 1104, H04M 300

Patent

active

044569912

ABSTRACT:
A telephone line circuit and system for interfacing digital exchange line circuits to a terminal interface of a switching network is disclosed. The system includes controllable active circuit impedance matching means for reducing impedance mismatch between a selected line circuit and the terminal interface. Control means controls both the active circuit impedance matching means for adjusting the effective circuit impedance to a value within a predetermined range, and the conditioning circuit gain pads for selectably adjusting the gain of a transmitted signal. Additionally, control means controls the d.c. line impedance and voltage for adjusting the effective line feed current to the subscriber loop, and provides interfaces for a plurality of line circuits to both a switching network and external processor. Supervision means provides supervision control signals to the control means and thereby permits the telephone line circuit system to provide desired telephone system functions.

REFERENCES:
patent: 3617643 (1971-11-01), Nordquist
patent: 4261051 (1981-04-01), Ohnishi et al.
patent: 4322843 (1982-03-01), Beuscher et al.
patent: 4327436 (1982-04-01), Ohara et al.
patent: 4356563 (1982-10-01), Viale
patent: 4370742 (1983-01-01), Minamitani et al.

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