Analog telephone subscriber terminal apparatus

Telephonic communications – Subscriber line or transmission line interface – Network interface device

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Details

379142, 379377, 379380, H04M 156, H04M 1506, H04M 100, H04M 300

Patent

active

061414166

ABSTRACT:
An analog telephone subscriber terminal apparatus with means for realizing additional functions is provided. In the on-hook state of the subscriber terminal apparatus, and outside of the idle operating state of the subscriber terminal apparatus, a current supply device that draws current from the subscriber line and is integrated into the terminal apparatus is switched effective for the duration of the reception of data containing the additional functions. The current supply device provides the supply current to the means for realizing the additional functions, but is limited to such an extent that the increased subscriber line loop current that then flows is not indicated as a loop closure.

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patent: 5546448 (1996-08-01), Caswell et al.
patent: 5553138 (1996-09-01), Heald et al.
patent: 5659602 (1997-08-01), Gay
patent: 5771281 (1998-06-01), Batten, Jr.

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