Telephone interface protection circuit and modem using same

Details Telephone interface protection circuit and modem using same Telephone interface protection circuit and modem using same

1996-04-16

1998-09-01

Kuntz, Curtis A.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379 2, 379 27, 379412, 375222, H04M 1100

Patent

active

058021515

ABSTRACT:
A telephone interface protection circuit and modem incorporating the telephone interface protection circuit. The circuit includes a sensing circuit and a determining circuit. The interface protection circuit checks for an active telephone line and checks the line for over-current conditions caused when a modem designed for the public switched telephone network is plugged into a private digital telephone network. The circuit functions when the modem is operating to provide continuous monitoring. It can be built as a stand-alone device or incorporated into a modem. The circuit notifies the user of the line condition either with LEDs or with a status message sent to the user via the host computer interface.

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Documentation for IBM Part Number 73G5395.

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