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Technology Stocks : Ascend Communications-News Only!!! (ASND)
ASND 212.29-2.2%Nov 19 3:59 PM EST
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To: uu who wrote (453)11/5/1997 1:49:00 PM
From: Maverick  Read Replies (1) of 1629
 
AT&T WorldNet
CURRENT BACKBONE ARCHITECTURE

The AT&T IP backbone has been deployed with 11 initial
nodes and a partial mesh of multiple DS-3 connections.
High-performance routers are employed at the nodes
interconnected by ATM/OC-3 links through ATM switches.
The network has been designed to contain no more than three
facility hops (wide- area hops) at its furthest point. All routers and switches are deployed in a
redundant fashion. The network has redundant management systems which are used to monitor
its performance.

The dial platform contains 220 local dial access numbers as well as Megacom 800 service for
toll-free access. Local distribution nodes are connected to hub nodes via dual DS-3s. The hub
nodes, which utilize network routers and ATM switches, are connected to the IP backbone via
OC-3 links.

AT&T's network is 100 percent digital with over 40,000 miles of fiber optic cable carrying 95
percent of the traffic. The network completes more than 190 million voice, data, and image
transactions each business day. Underlying this large infrastructure is FASTAR, a system
which automatically routes AT&T's backbone traffic around cable failures. In its current design,
the company says, FASTAR can restore 90-95 percent of a large failure within two or three
minutes.

FUTURE EXPANSION PLANS

AT&T plans to extend the current OC-3 hub architecture and expand the network capacity to
OC-12 and OC-48. AT&T is currently deploying ATM switches to its backbone nodes. The
next phase is to convert the backbone network to an ATM switch fabric. AT&T plans to spend
$8 billion to $9 billion to upgrade its core infrastructure to SONET/ATM for all voice and data
services. As part of this effort, AT&T has already installed 30 OC-48 SONET rings across the
U.S., and plans to install an additional 50 in 1998.

Currently, dedicated AT&T WorldNet Managed Internet Service customer circuits are
back-hauled to one of the 11 backbone nodes for connection to the network. The next wave of
development for this infrastructure will be to deploy 100 concentrator nodes. The concentrator
nodes will be connected with the 11 backbone nodes through DS-3s. This second tier of
development will begin later in 1997 and continue into 1998. With the deployment of the
concentrator nodes, customer circuits will then be back-hauled to either the nearest
concentrator node or backbone node for connection to the network.
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