Telephonic communications – Diagnostic testing – malfunction indication – or electrical... – Testing of network terminating interface – subscriber trunk...
Patent
1987-02-11
1987-12-01
Schreyer, Stafford D.
Telephonic communications
Diagnostic testing, malfunction indication, or electrical...
Testing of network terminating interface, subscriber trunk...
309632, H04B 346
Patent
active
047109491
ABSTRACT:
A fault locating device for determining whether a problem exists on the customer side or the office side of a telephone line. A voltage and current sensitive switch is connected in series with each of the ring and tip lines near the customer side. The voltage and current sensitive switches are activated by a current demand only in the presence of a threshold voltage across the telephone line. The switches include a triac connected in series with each telephone line and a bilateral avalanche device connected to the gate of the triac and the telephone line. The switches will not turn on, and the customer will remain disconnected from the central office if the voltage is below the breakover voltage of the avalanche device. A distinctive termination circuit is connected across the tip and ring lines on the customer side of the voltage and current sensitive switches. The termination circuit conducts only when the ring is positive and the tip is negative. This provides a signature to the central office, indicating the presence of a fault locating device in the customer loop. A test voltage is applied below the threshold voltage of the voltage sensitive switches to test the line with the customer side disconnected to determine which side of the device a fault is located.
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Schreyer Stafford D.
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