ISDN interface unit with separate ring generator

Details ISDN interface unit with separate ring generator ISDN interface unit with separate ring generator

1995-04-21

1996-10-08

Zele, Krista M.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379418, 3701101, H04M 302, H04J 312

Patent

active

055639437

ABSTRACT:
An ISDN interface unit interconnects a data processing unit, an ISDN, and an analog telephone and includes a ring sound controller for supplying a control signal to designate a generation of a ring of the analog telephone through a modular jack; a ring signal generator generating a ring sound; a switch selecting one of the ring sounds generated and supplying the ring sound to the analog telephone. Further, the ISDN interface unit comprises communication functions for the digital signal and for the voice band signal, a control channel signal sent from the ISDN line is interpreted, and one of the communication functions can be selected.

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