Chapter 1
2
1.2 Product Description
Using industry-standard Discrete Multi-Tone (DMT) technology, the ADSL
device interfaces to any ITU G.dmt, UAWG, G.lite and ANSI T1.413, Issue 2
compliant, Central Office equipment at speeds of 8 Mbps downstream and
1 Mbps upstream (depending on the distance from the Central Office, selectable
in
increments
of
32kbps).
The
Central
Office
equipment
provides
Asynchronous Transfer Mode (ATM) aggregation over ADSL on each copper
loop.
A fully integrated IP router featuring Network Address Translation (NAT)
automatically assigns local IP addresses and protects network security by not
advertising the internal address or network topology. A built-in Dynamic Host
Configuration Protocol (DHCP) Server assigns IP addresses to all LAN stations.
The AT-AR250E includes an integral 4-port Ethernet Bridge/Router supporting
a directly connected PC from any of its Ethernet ports. or a network of cascaded
LAN hubs.
The AT-AR240E and the AT-AR250E both offer Password Protection and User
Authentication (PAP/CHAP) with PPP to prevent inadvertent access to the
router through the Internet. It also enables Telnet management access.
