Off-hook detector with reduced sensitivity to common mode

Details Off-hook detector with reduced sensitivity to common mode Off-hook detector with reduced sensitivity to common mode

1982-03-09

1984-06-26

Brown, Thomas W.

H04M 322

Patent

active

044567910

ABSTRACT:
An off-hook detector for use in subscriber line interface circuits to indicate status of the subscriber line, or loop, exhibits reduced sensitivity to common mode or longitudinal currents. A central signal from the exchange switches the transmission bridge for the subscriber line from a balanced to an unbalanced condition. In the balanced condition a difference detector indicates loop status. In the unbalanced condition, a comparator compares the voltage on one side of the transmission bridge to a reference voltage to indicate loop status.

REFERENCES:
patent: 3772477 (1973-11-01), Richards
patent: 4087646 (1978-05-01), Brolin et al.
patent: 4158109 (1979-06-01), Dijkmans et al.
patent: 4178485 (1979-12-01), Cowpland et al.
patent: 4297531 (1981-10-01), Dalhof et al.

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