Demand Routing and Bridging with the Express L128/L128T. ADTRAN Express L128T S, L128, L128T

Chapter 1: Understanding ISDN and the Express L128/L128T

2.

IP Router: The Express L128/L128T can function as an IP router using the

Routing Information Protocol (RIP) for advertising and learning routes among other routers. Static routes may also be entered into the routing table.

3.

IPX Router: IPX routers and services can be exchanged between the Express L128/L128T and other devices using RIP and Service Advertising

Protocol (SAP). Watch dog serialization filtering and spoofing can permit the ISDN to be idle during no application traffic periods.

4.

Network Address Translation (NAT): Single networks can connect to the

Internet with this function. The Express L128/L128T translates outgoing

IP packets over the ISDN to the IP router at the Internet Service Provider.

Popular Internet applications are supported.

5.

POTS: The POTS interfaces can be used for interfacing to dual tone multifrequency (DTMF) analog devices such as telephones, modems, fax machines, etc. The Express L128T POTS option is available on part number

1202070L2 only.

Demand Routing and Bridging with the Express L128/L128T

The Express L128/L128T is a dial-up ISDN IP Router and Transparent Learning Bridge that provides Dial-On-Demand and Dynamic Bandwidth Management. Its features can be easily configured and used once several basic concepts are understood.

Factory Default

The Express L128/L128T comes from the factory configured for MAC Bridging, IP routing, and IPX routing with no filters or connection information defined. An IP address of 10.0.0.1 with a network mask of 255.255.255.0 is preloaded. Dynamic Bandwidth Management features are disabled. Although dynamic assignment of a B-channel for the analog (POTS) ports on the

Express L128T model is always available, link idle time-out and adding/removing of B-channels based on traffic is initially disabled.

12 Express L128/L128T User Manual 61202.070L1-1