Operation Manual

The Driver Software for the AVM ISDN-Controller C4

Controller C4 – 1 Introduction 7

The ISDN-Controller C4’s S

interfaces

1.2 The Driver Software for the AVM

ISDN-Controller C4

The ISDN-Controller’s driver software controls the communi-

cation processes and the data transfer.

The software for the C4’s on-board CPU is downloaded to the

ISDN-Controller card from the PC’s hard disk. This technique

makes it possible to update the controller software easily at

any time, so that new features can be added or adapted

without manipulating the ISDN-Controller hardware.

The controller software can perform data compression in ac-

cordance with the V.42bis standard. For more information on

automatic data compression, please see the section “CAPI

SoftCompression X.75/V.42bis” on page 32.

Furthermore, the controller software also supports analog

services such as Group 3 fax and modem communication.

For details, see the section “CAPI SoftFax” on page 33.

CAPI (Common ISDN API)

The ISDN-Controller C4 driver software provides the applica-

tion interface CAPI 2.0 in the PC. This interface specified by

the international standardization body ETSI, guarantees the

universal interchangeability of ISDN applications for the use