3Com AccessBuilder 500, User Manual

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Bridging and Routing Concepts A-5
The AccessBuilder 500 uses FastConnect, its own protocol, to ensure the
most efficient connection with other AccessBuilder units. However, if you
are connecting to a different type of bridge/router the standard PPP
communications protocol is required to establish the link. You can
configure outgoing calls to use either FastConnect or PPP as required. The
ISDN port on the AccessBuilder 500 autosenses the protocol being used on
incoming calls and switches to the protocol necessary for that connection.
If you are using ISDN to connect to different networks, the two B
channels can be used independently to connect to different networks
at the same time.
Building a Larger Network
Large networks of interconnected LANs can be established by using
multiple bridges as illustrated in Figure A-2 .
The bridges build up their address tables. If the destination unit is not
registered as being accessed via the bridge’s LAN interface, the frame
will not be placed on LAN A. Therefore, frames passing between LAN B
and LANs C or D will not impact the overall performance of the LAN.
Figure A-2 Multiple Remote Bridges