Hook status detector for a subscriber loop interface circuit

Details Hook status detector for a subscriber loop interface circuit Hook status detector for a subscriber loop interface circuit

1981-02-26

1983-09-27

Rubinson, G. Z.

179 18FA, H04B 158

Patent

active

044069294

ABSTRACT:
A circuit for use with a subscriber loop interface circuit (SLIC) to detect the hook/switch status of the telephone handset driven by the SLIC. Responsive to metallic current flowing through the handset when the telephone is taken off hook, a voltage is derived which exceeds a threshold level as well as a current is produced which is proportional to the value of the metallic current. Whenever the produced current level is less than a predetermined value in conjunction with the threshold level being exceeded, a comparator threshold circuit is rendered operative to produce a signal indicative of the hook status being in a closed switch state. With the hook being in an open switch state, the voltage is caused to be less than the threshold level wherein the comparator threshold circuit is maintained in an non-operative state.

REFERENCES:
patent: 4004109 (1977-01-01), Boxall
patent: 4142075 (1979-02-01), Olschewski
patent: 4203012 (1980-05-01), Boxall
patent: 4300023 (1981-11-01), Kelley et al.
L. Brown & B. Bynum; "One Chip Closes in on Slic Functions"; Electronic Design; Sep. 1980; pp. 85, 90, 91.

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