Electronic switch for digital telephone

Details Electronic switch for digital telephone Electronic switch for digital telephone

1985-09-16

1987-01-13

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379387, 379413, H04M 100, H04M 1900

Patent

active

046365877

ABSTRACT:
An electronic switch for supplying power to a digital telephone which consumes substantially no power in the idle mode. A transistor for supplying power to the digital telephone is latched on in either of two situations. In the first situation, the telephone's hookswitch is closed. A second transistor turns on and maintains the first transistor on even after the hookswitch has been opened. In the second situation, a voltage pulse is applied to the input voltage conductor lines causing the first and second transistors to turn on. Again, the second transistor maintains the first transistor on. The circuit is inactivated by a sleep signal which turns off the second transistor which in turn turns off the first.

REFERENCES:
patent: 4493949 (1985-01-01), Retallack et al.

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