Operation Manual

32 NetWare MultiProtocol Router for ISDN 3.1 Installation and ISDN Configuration Guide
Appendix B for phone numbers and access information) and the new
features will be described in a Technical Note.
Classic WANs Involve Classic ISDN Interface Use
The NetWare MultiProtocol Router for ISDN allows you to set up
classic WANs over ISDN, for example to interconnect three remote
LANs permanently to form a company-wide WAN over ISDN.
Permanently of course does not mean that the physical ISDN con-
nection is permanently up (Inactivity Timeout controls the physical
connection), but permanently available to be dialed and set up
whenever needed, since a basic assumption for classic WANs is that
all servers and services at all sites must be available all the time to
run any networking tasks over the WAN the same way as it is done
within the LAN.
But, since ISDN offers fast call set-up, new, additional requirements
come up that can be accomplished as well with the NetWare Multi-
Protocol Router for ISDN and are not common with classic routing
and classic WAN media: So-called dial-around tasks, where connec-
tions to remote sites are not required permanently but only needed
temporarily, for example twice a week to perform tasks such as
distributing software updates, e-mail or collating databases, as well
as to offer dial-up access to services or specific company-owned
resources over ISDN for other LANs and stand-alones, for example
access to information or database services.
Classic and Dynamic ISDN Interface Use
When setting up classic WANs, you use the ISDN interfaces in this
classic way. When accomplishing dial-around scenarios, you use
ISDN interfaces and underlying B channels dynamically to connect
to multiple remote sites. You can mix both concepts with the Net-
Ware MultiProtocol Router for ISDN, for example use three ISDN
interfaces and underlying B channels for classic WAN links and use
a fourth ISDN interface and underlying B channel to accomplish
dial-around tasks. The two are described in detail in the following.
Classic WANs over ISDN are set up by dedicating one ISDN inter-
face to each destination. This guarantees that the underlying physi-
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