Audible signaling device for informing when a telephone line is

Details Audible signaling device for informing when a telephone line is Audible signaling device for informing when a telephone line is

1995-12-21

1997-09-16

Zele, Krista M.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379164, 379167, 379382, 379374, H04M 1100

Patent

active

056688709

ABSTRACT:
A device is provided for connection to a shared telephone line for detecting and audibly indicating the on-hook and off-hook status of the line. The device includes sensing and changing circuitry connected to the shared telephone line for detecting a voltage step occurring during status change transitions between on-hook and off-hook states and correspondingly changing the device during these status changes transitions so that the device is prohibited from drawing power from the shared telephone line when the shared telephone line in not in use. A piezo speaker produces audible on-hook and off-hook sights corresponding to on-hook and off-hook states of the telephone line.

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