Ground start and tip ground detection without the use of -48V or

Details Ground start and tip ground detection without the use of -48V or Ground start and tip ground detection without the use of -48V or

1997-06-23

1999-06-08

Eisenzopf, Reinhard J.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379377, H04M 100

Patent

active

059109858

ABSTRACT:
A loop detector circuit for detecting the loop current of a telephone circuit in a ground start mode and a normal mode which obviates the need for a separate TIP ground detector circuit. A pair of light emitting diodes (LED) 52, 54 are associated with a photoelectric device, such as a phototransistor 56, 58, connected across TIP and RING with a series resistor. Each resistor 60, 62, is selected to provide a predetermined voltage drop during a ground start mode and a normal mode, thus enabling the loop detector to detect loop current during both modes. The loop detector circuit is thus able to detect the off-hook status of a subscriber handset during a ground start mode without the use of a separate TIP ground circuit.

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