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