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164 IBM ISDN PC Card:User’s Guide
There are no binding standards for ISDN dial-up access to ISPs. PPP and SLIP
protocol variants, fixed and dynamically assigned IP addresses, static or dynamic
name server addresses and a variety of authentication procedures are all possible.
For TCP/IP connections with the NDIS WAN device driver, you must use 32-bit
client software (such as Web browsers and FTP clients), and not 16-bit software for
Windows 3.x. Otherwise, no IP connection can be established with Windows 95's
32-bit TCP/IP protocol stack.
ISDN B channel protocols and PPP variants
Many Internet providers use HDLC or the X.75 protocol on the ISDN B channel.
Two protocol variants are used for PPP connections: “PPP over ISDN“, based on
RFC 1618 and also known as synchronous PPP; and “modem-style PPP“, based
on RFC 1162 and also called asynchronous PPP.
Your Internet Service Provider (ISP) can tell you which protocol combinations and
authentication procedures you need for ISDN access.
Incorrect protocol settings result in immediate termination of the connection or
failure to establish a connection at all, with the Dial-Up Networking error
message
The computer you are dialing in to is not answering.
These settings are fixed in the Microsoft NDIS specification, and cannot be
modified by the user. If you require other protocols or PPP variants, use the ISDN
CAPI Port Device Driver or cFos.
Connecting computers using remote access service (RAS)
This section provides information on connecting your Windows 95 computer with
another computer (Windows 95 or Windows NT) for the purpose of accessing
remote files. For assistance with RAS configuration, please refer to the Windows
95 manual or on-line Help.
In this section, “Server” refers to the computer waiting to answer an incoming
call, while “Client” refers to the computer that dials up the ISDN connection. The
RAS configuration procedures for Windows 95 and Windows NT are different.
Windows NT 3.51/4.0 enables you to operate RAS in server mode using the
appropriate NDIS WAN CAPI Device Driver for Windows NT.
Remote access service (RAS) in Windows 95
To use RAS, you need the following components:
• An ISDN adapter with current CAPI 2.0-compliant device driver software
•The NDIS WAN CAPI Device Driver for Windows 95
• Dial-Up Networking (with the Dial-Up Server module for the server
computer)
• A network protocol (such as NetBEUI) with suitable client software, bound to
the dial-up adapter
ISDNmst.fm Page 164 Wednesday, January 15, 2003 9:22 AM