ADTRAN Express 6100, Manual

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Chapter 1. Understanding IDSL and the Express 6100/6120
1-4 Express 6100/6120 User Manual 61200176L1-1
Figure 1-6. SOHO to Corporate LAN (6120)
The Express 6100/6120 provides the following basic functions:
1. LAN Bridge: Bridging provides a point-to-point connection
between two LANs. The bridge learning function scans the
source and destination media access control (MAC) addresses of
all packets on its local LAN and determines which packets
should be transmitted over the IDSL link. Applications include
connectivity between single user or small offices to corporate
LANs.
2. IP Router: The Express 6100/6120 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 6100/6120 and other devices using RIP and Service
Advertising Protocol (SAP). Watchdog serialization filtering and
spoofing can permit the ISDN to be idle during no application
traffic periods.
4. Network Address Translation (NAT): Single networks can con-
nect to the Internet with this function. The Express 6100/6120
translates outgoing IP packets over the IDSL to the IP router at
the Internet Service Provider. Many popular Internet applica-
tions are supported.
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