Loop to ground start circuit

Details Loop to ground start circuit Loop to ground start circuit

H - Electricity

04

M

379/67

H04M 3/22 (2006.01) H04Q 1/50 (2006.01)

Patent

CA 1112384

LOOP TO GROUND START CIRCUIT Abstract of the Disclosure A circuit for translating a loop start to a ground start signal in a communication system interconnected via a tip lead and ring a ring lead, in which the ring lead is connected to a source of potential at a central office or PABX, is comprised of a latching switch connected from a ring lead terminal through a resistance to a ground terminal, a latching switch closing circuit connected to the tip lead for sensing a predetermined potential applied thereto, adapted to close the switch upon its detection of at least a predetermined proportion of the potential applied to the tip lead as a result of the external application of the source of potential from the ring lead to ground, and a latching switch opening circuit adapted to open the switch following connection of the tip lead to ground through external circuity at the central office or PBX.

324426

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