Isdn adapter board

Details Isdn adapter board Isdn adapter board

H - Electricity

04

L

H04L 12/52 (2006.01) G06F 13/38 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2157866

According to the invention, a passive ISDN adapter board is made compatible with a modem connected to the serial connectors by: a serial controller known per se, as is normally used to connect an external data transmission device; an ISDN data transmission controller connected to the serial controller and controlled by the CPU of the computeri and an ISDN connection controller controlled by the CPU of the computer and connected to the ISDN controller, without the need to use the INT-14-H interface for the evaluation process. This solution is based on the idea of simulating an externally connected data transmission device with the aid of the processor of the data terminal device.

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