IBM 19K5716 manual Remote access service RAS with Windows 95/98

•Only for X.75 connections:

Data compression according to V.42bis can be used only for X.75 connections. Possible applications include ISDN Point-to-Point connections and connections to ISDN BBSs. According to CAPI 2.0, a secured data link is imperative for V.42bis connections. As only the X.75 protocol guarantees this feature, V.42bis can be used only with this protocol. As HDLC is nearly always used as an ISDN B2 protocol in connections to Internet providers, it is not possible to establish connections with data compression on ISDN protocol level.

•Automatic negotiation:

When a connection to an X.75 remote site is established, the system automatically tries to negotiate V.42bis. If this does not succeed, e.g. because the remote site does not support V.42bis, a connection without data compression is made automatically.

•Cannot yet be applied to connections to AOL or CompuServe:

The PoPs (points of presence) of AOL and CompuServe do support the X.75 protocol, but, at the time this document was printed, did not yet allow the use of V.42bis. Should problems arise in dialing up these services, select the virtual modem AVM ISDN Mailbox (X.75) rather than the modem ISDN SoftCompression X.75/V.42bis.

Keep in mind that the V.42bis data compression algorithm of passive ISDN- Controllers is processed on the host's CPU and thus demands more powerful hardware. In the case of active controllers of the B1 family, the algorithm is processed completely on the Controller.

Note: With the command ATS42=8, V.42bis can be activated manually for X.75 connections as well.

Remote access service (RAS)

The ISDN CAPI Port Device Driver can be used for RAS connections to Windows 95/98 and Windows NT 3.51/4.0 computers. The virtual modem ISDN RAS (PPP over ISDN) is provided for this purpose.

In Windows 95/98, Dial-Up Networking requires an additional server module to serve as a remote site. Windows NT 3.51/4.0 computers can use the NDIS WAN CAPI Device Driver for Windows NT or the ISDN CAPI Port Device Driver for Windows NT to make WAN connections over ISDN.

Connections and caller authentication are managed by the PPP protocol (PPP over ISDN, RFC 1618) for both operating systems. HDLC is the specified ISDN B2 protocol. The remote computer is then accessible over ISDN using network protocols such as TCP/IP, SPX/IPX or NetBEUI.

Remote access service (RAS) with Windows 95/98

See the Windows 95/98 documentation for instructions about how to configure Remote Access Service (RAS). Should any problems with RAS arise, contact your

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