ISDN terminal adapter for access from analog signal equipment of

Details ISDN terminal adapter for access from analog signal equipment of ISDN terminal adapter for access from analog signal equipment of

1992-08-06

1994-08-23

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

379402, 379 32, 379 2, 379 12, 379 26, 379221, 370 14, 370 161, 370 16, H04M 1106, H04M 322

Patent

active

053414187

ABSTRACT:
In order to back up by an ISDN line two analog lines connected to MODEM of a four wire full duplex type for data transmission and reception, a terminal adapter is connected to a pair of back-up ports. Dial pulse signals delivered through the back-up ports are detected and converted into an ISDN telephone number. A D-channel processor performs the call connection by use of the D-channel signal having the ISDN telephone number and an identifier of a particular one of B-channels. An outgoing analog data from the MODEM through one of the back-up ports is A/D converted and then transmitted on the particular B-channel to the ISDN line. An incoming digital data on the particular B-channel signal received at the terminal adapter is D/A converted and is supplied to the MODEM through the other of the back-up ports. Thus, the back-up is performed by use of a single B-channel on the ISDN line.

REFERENCES:
patent: 4076961 (1978-02-01), Holsinger et al.
patent: 5210740 (1993-05-01), Anzai et al.

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