Maintenance termination unit

Details Maintenance termination unit Maintenance termination unit

H - Electricity

04

M

344/1.5

H04M 3/08 (2006.01) H04B 3/46 (2006.01) H04M 3/30 (2006.01) H04Q 1/20 (2006.01)

Patent

CA 1180086

- 14 - MAINTENANCE TERMINATION UNIT Abstract of the Disclosure A maintenance termination unit comprises a voltage sensitive switch connected permanently in series with each loop conductor and an impedance termination unit connected permanently across the loop conductors. Each voltage sensitive switch comprises a triac connected in series with a loop conductor, a capacitor and resistor connected across the terminals of the triac, and a bilateral switch connected between one of the terminals and the gate electrode of the triac. In response to a signal having a voltage greater than the threshold voltage of the switch, the capacitor is charged to the threshold voltage, thereupon the capacitor discharges insuring that the triac is gated to the ON state.

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