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200 IBM ISDN PC Card:User’s Guide
Data communications software and analog modems at the remote
site
As long as your CAPI 2.0 device driver software supports analog connections, the
virtual modem ISDN Analog Modem (V.32bis) can be used to access analog
remote sites like BBSs. The maximum speed possible is 14,400 Bit/s (V.32bis). This
virtual modem also will support any higher speeds offered by future versions of
the CAPI 2.0 device driver software.
The required protocols ("V.32bis" and "asynchronous PPP") are set by default on
the ISDN Analog Modem (V.32bis) virtual modem.
Using data communications software with an emulated COM port
© AVM Vertriebs KG, 2000
If the ISDN CAPI Port Device Driver is installed with its default settings, one port
(ISDNx) is assigned to each virtual modem. Thus any software using the
UNIMODEM interface (TAPI modems) of Windows NT/2000 can work with the
virtual modems. No changes to the virtual ports are necessary. Such software
includes, for instance, Windows NT/2000 Dial-Up Networking and
Hyperterminal.
However, using data communications software which does not support the
UNIMODEM architecture of Windows NT/2000 and requires COM ports, a COM
port must be assigned to each virtual port. (Such data communications programs
include older versions for Windows 3.x).
The assignment of COM ports to the virtual ports "ISDN1” and ”ISDN2" is only
possible during installation of the ISDN CAPI Port Device Driver (see "Installing
the ISDN CAPI Port Device Driver"). During installation, COM ports can be
assigned on the Ports page. The settings are implemented upon completion of the
installation routine.
Note: Before assigning COM ports, check which COM ports are already being
used by other hardware components such as serial interfaces!
The COM ports assigned now are available to Windows NT/2000 with 32-bit or
16-bit applications.
The following protocols are set by default::
• ISDN B2 protocol: X.75
• PPP variants: PPP over ISDN (synchronous PPP).
To configure other protocol settings, use AT commands (see Appendix A).
Example: To set up a connection to an analog BBS using 16-bit Windows 3.x
software such as Procomm Plus 3.0 and a passive ISDN-Controller over COM 3,
the modem initialization commands must be set to AT S31=8 and S51=0 (analog
modem and asynchronous PPP) in your communications software.
ISDNmst.fm Page 200 Wednesday, January 15, 2003 9:22 AM