Telephone ring detector

Details Telephone ring detector Telephone ring detector

1995-06-27

1996-08-06

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379375, 379 82, H04M 100, H04M 300

Patent

active

055442412

ABSTRACT:
A telephone ring detector detects a ring signal voltage from a diverse set of signals transmitted on a telephone line before a complete alternating current ring signal cycle is received. In an exemplary embodiment, the ring detector includes a voltage threshold setting device for establishing a voltage threshold and comparing the ring signal voltage to the voltage threshold to provide an output signal when the ring signal voltage is above the voltage threshold. A pair of zener diodes having a selected voltage value can provide the threshold setting and comparison functions. A microprocessor, including a timer for measuring a time duration of the output signal, outputs a ring detection signal when the time duration exceeds a predetermined time interval value, which is substantially less than a full ring cycle. A line switch responsive to the ring detector is provided to direct communication signals to a telecommunications device.

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Brochure of Hello Direct containing pp. 40.varies.42, "3 Pages of PCTI Products" No Date.
Brochure of Hello Direct contaning pp. 37-39, "Why waste money on separate phone, fax and modem lines"? No Date.

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