Operation Manual

24 NetWare MultiProtocol Router for ISDN 3.1 Installation and ISDN Configuration Guide
features than PPP over ISDN such as data compression (accord-
ing to V.42bis) and various line management features, it is the
recommended protocol to be used for connections between
AVM´s NetWare MultiProtocol Routers for ISDN and NetWare
MultiProtocol Router for ISDN and AVM´s remote node product
NetWAYS/ISDN.
- PPP over ISDN
PPP over ISDN is an international standard intended to provide
interoperability between remote access products of different
manufacturers over ISDN. Since existing RFCs do not yet cover
all features implemented in the NetWare MultiProtocol Router for
ISDN, only those features can be used with PPP over ISDN that
are already standardized through RFCs and are supported by the
respective remote device. For a list of RFCs supported with the
NetWare MultiProtocol Router for ISDN 3.1, refer to Chapter 9,
"Configuring PPP over ISDN."
- Auto-Framing
The Auto-Framing option enables the NetWare MultiProtocol to
automatically detect whether an incoming call uses the AVM
Proprietary protocol or PPP over ISDN.
The following options are supported on the B channel:
♦♦ ISDN connections with 64 Kbps and with 56 Kbps
Some public switches, mostly in the USA, do not offer 64 Kbps, but
only 56 Kbps on the B channel. To decrease bandwidth to 56 Kbps, a
signaling character is used on the D channel ("r" for restricted) in
this case, which is added to the number dialed.
♦♦ GSM 04.22 (ISDN over GSM - Mobile ISDN)
This is not an option, but a protocol implementation on layer 1 of the
B channel that is supported by the NetWare MultiProtocol Router for
ISDN for remote node access with NetWAYS/ISDN and direct
mobile-to-mobile LAN links over GSM-based cellular networks. It
allows remote clients to use cellular mobile networks instead of
terrestrial ISDN lines when dialing in to the LAN via NetWare
MultiProtocol Router for ISDN. At the ISDN access of the LAN side,
nothing changes and no special or additional option has to be ap-
plied for for mobile-to-ISDN links. However, use of this option
depends on whether providers of GSM-based cellular networks offer
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