Reference Guide for the Model RT210/RT211 ISDN Routers
Introduction 1-7
If the NETGEAR Model RT210 router shares an ISDN line with other ISDN devices, the router
must identify and route incoming calls. You can use either subaddressing or Multiple Subscriber
Numbering (MSN) as ways to identify where the incoming calls belong. These options are enabled
only by the ISDN providers. For further information on subaddressing and MSN, refer to
“Subaddressing and Multiple Subscriber Numbering (MSN)” on page 3-15.
Using TCP/IP The network or subnetwork numbers must be different at each end of a link for the routers to
function correctly. If several routers are connected to the same LAN segment, they should have the
same network or subnetwork numbers, but different host numbers. Using TCP/IP, you can assign
addresses to assure proper routing.
For more information, refer to Appendix B, “TCP/IP Routing.”
Using PPP to Connect to Other Devices The Point to Point Protocol (PPP) was designed to allow interoperability between networking
equipment of different manufacturers at a basic level. Because of the many different
implementations of the standard, you might need to try a number of configuration options before
communication can be established.
The NETGEAR Model RT210 and Model RT211 ISDN routers have several preconfigured
profiles, but can be changed when full configuration of all the PPP options is needed.
Multilink PPP
When a path is configured for PPP, Additional Bandwidth on Demand can be enabled only if
Multilink PPP is available on the remote unit.
Multilink PPP (MP) is an addition to the basic PPP protocol that allows more than one link to be
directed to a destination. If a unit supports the MP protocol, then it can be negotiated automatically
on the initial link startup. When additional Bandwidth on Demand calls are made, the extra
bandwidth is made available to the path.
Note:
When you are using the PPP profile “SIMPLE” MP is disabled.
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