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Technology Stocks : Qwest Communications (Q) (formerly QWST)

Q 98.22

+5.9%

Feb 6 9:30 AM EST

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To: laleh who wrote (288)	11/6/1997 8:27:00 PM
From: laleh	Read Replies (1) of 6846

To end the confusion (about what AT&T is doing and their network configuration), I'm posting the actual article which discussed it and their $8-9 billion upgrade plan. The "how" and "whose" is not detailed out. 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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