Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent
1997-06-26
2000-07-25
Bost, Dwayne D.
Telephonic communications
Supervisory or control line signaling
Using line or loop condition detection
379373, H04M 100
Patent
active
060944803
ABSTRACT:
A ring trip detector has a voltage difference detector with first and second inputs, for supplying an off-hook signal upon detection of a voltage difference. The ring trip detector also has a switch extending between the first and second inputs of the voltage difference detector. The ring trip detector detects when a telephone current starts to flow through a sensing resistor having first and second ends and to a telephone set. The switch closes upon an initial current flow through the sensing resistor and then opens. The ring trip detector has a pulse generating mechanism having two inputs respectively connected to the first and second ends of the sensing resistor. The pulse generating mechanism has an output and generates a pulse at the output when current starts to flow through the sensing resistor. The switch has a trigger connected to the output of the pulse generating mechanism for closing the switch when the pulse is generated. A differentiator mechanism may be used as the pulse generating mechanism. Such a differentiator mechanism may have a resistor and a capacitor connected in series between the first end of the sensing resistor and the trigger of the switch, and a resistor connected between the second input of the voltage difference detector and the trigger of the switch. Alternatively, a differentiator/integrator mechanism may be used as the pulse generating mechanism.
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Bolla Mark
Kiykioglu Serdar
Ueshima Tsuyoshi
Vaclavik Peter
Bost Dwayne D.
Fujitsu Network Communications, Inc.
Wyche Myron K.
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