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168 IBM ISDN PC Card:User’s Guide
6. Click OK to close the window.
Now when you activate this dial-up connection, the computer will automatically
attempt to connect to the destination ISDN number using both ISDN B channels.
If only one ISDN B channel can be used –if your ISP does not support multilink
PPP for example– no message will appear to indicate the fact. You can see how
many B channels have actually been connected, however, by double-clicking the
Dial-Up Networking icon in the Windows 95 task bar. Click Details to manually
connect and disconnect the second B channel as desired. This technique allows
you to double the connection bandwidth as needed for such tasks as
downloading large files from the Internet, and to reduce it again afterwards to
avoid excessive charges.
Legal notice
The AVM NDIS WAN CAPI Device Driver is commercial software owned by
AVM Computersysteme Vertriebs GmbH Berlin.
The AVM NDIS WAN CAPI Device Driver and accompanying documentation
may not be offered, used, altered, or marketed, nor may any of its identifying
characteristics be altered, as part of offerings by third parties, such as hardware
and software manufacturers, without written permission from AVM
Computersysteme Vertriebs GmbH. Bundling with hardware and software not
manufactured by AVM is expressly prohibited. Reverse engineering of the AVM
NDIS WAN Device Driver, in whole or in part, is not permitted.
Possible faults and remedies
• Fault condition: RAS (Dial-Up) Error “Connection has gone down”:
Possible cause: This common error message can have many causes, such as a
busy remote terminal, faulty cabling, an incorrect D channel protocol, no
CAPI available (ISDN adapter device driver not loaded), B channel already in
use, etc.
Solution: Check the following:
Examine whether another CAPI application has access to the ISDN adapter
and the ISDN line. If not, refer to the trouble-shooting section in the ISDN
adapter manual.
• Fault condition: CAPI applications that answer incoming data calls (with the
service indicator DATA64K) are not functioning alongside the NDIS WAN
CAPI Device Driver in RAS server mode.
Possible cause: Both the CAPI data application and RAS with the NDIS WAN
CAPI device driver are trying to answer the same calls.
Solution: Assign a different Multiple Subscriber Number (MSN) to each
application so that incoming calls can be differentiated.
• Fault condition: Unable to establish PPP connection
Possible cause: The Windows 95 ISDN Accelerator Pack v1.1 uses the Point-to-
Point Protocol (PPP) over ISDN as specified in RFC 1618. This protocol is also
referred to as synchronous PPP, and is a standard in ISDN internetworking.
ISDNmst.fm Page 168 Wednesday, January 15, 2003 9:22 AM