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© Copyright IBM Corp. 2002 177
13. ISDN CAPI Port Device Driver
Prerequisites for the CAPI Port installation
Before the CAPI port device drivers may be installed, the device drivers for the
IBM International ISDN PC Card must be installed. If you already have CAPI port
device drivers installed, reinstallation may not be possible without removing
older driver versions. See “Removing the ISDN CAPI Port device driver” on page
179 for more details.
Version 02.02.01 for Windows 95 and 98
The ISDN CAPI Port Device Driver is a universal ISDN connectivity solution for
the Microsoft Windows 95/98 operating system. It facilitates the use of Remote
Access Services (RAS) and Dial-Up Networking connections to the Internet and to
on-line services.
Technically, the ISDN CAPI Port Device Driver mediates between Windows
95/98’s UNIMODEM/VCOMM architecture and the applications interface
COMMON-ISDN-API 2.0 (CAPI). The CAPI 2.0 interface, a manufacturer-
independent standard, is provided with the ISDN-Controller and loaded by the
Controller's installation program.
Virtual modems
After simple installation in Windows 95/98, the CAPI Port Device Driver supplies
up to eight virtual modems which are immediately available for use. These
modems allow the ISDN-Controller in your computer to be used even by
programs that expect an analog modem.
Each of the virtual modems is available for a different application. For instance,
the ISDN FAX (G3) modem is configured for fax applications, while ISDN RAS
can be used for remote-access connections to remote computers.
The default configurations of the virtual modems allow them to be used
immediately in most conventional implementations without any further
configuration required. However, it is also possible to adapt the ISDN CAPI Port
Device Driver for special cases such as the configuration of the Internet
connection and RAS (see ” Modem Settings Using Registry Commands").
Programs that use the CAPI interface directly can exploit the CAPI Port modem to
use the second B channel for their own use, parallel to an existing Dial-Up
Networking connection. This is possible because the B-channel assignments are
performed by CAPI automatically.
ISDNmst.fm Page 177 Wednesday, January 15, 2003 9:22 AM