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Technology Stocks : Westell WSTL -- Ignore unavailable to you. Want to Upgrade?

To: Terry Mitchell who wrote (8160)	12/6/1997 8:25:00 PM
From: bill c.	Read Replies (2) \| Respond to of 21342

Terry: Netspeed is private, and Westell may not use Modem Pooling. Venkata C. Majeti, Director of Technology Management for Westell has an article dated dec 1, 1998 in Internettelephony. I'll post just the last few paragraphs: internettelephony.com 1) Click on "The Archives" section in the Content frame 2) Select "1997 Telephony" 3) Select "December 1" 4) Look in the Features section and select "DSL modem pooling reconsidered" DSL modem pooling reconsidered Modem pooling, or any other means of access concentration, may be inappropriate for DSL... ....According to its definition, a rate-adaptive DSL modem is designed to automatically determine the maximum permissible throughput for any given user line. The service offered to a given user defines the modem configuration and, subsequently, the ATU-R and ATU-C are set to that configuration. Any changes to this configuration under current product conditions require a "modem retraining" in which the user and network modems are adjusted to a new set of parameters. The process takes several seconds and may require an initialization of the physical layer. In order for "modem pooling" to work, all the modems must have a homogeneous configuration so they do not have to go through "retraining." Given different loop lengths, loop conditioning and user preference to select different grades of service, imposing a uniform configuration on all modems is unrealistic. Managing different classes of service via operational procedures could outweigh any savings that may be realized due to modem pool design. In current ADSL deployment architecture, the cost of network routing--as incurred in backbone network and gateway routers--far outweighs the cost of access equipment. With current trends in modem design and silicon integration, it is likely that the same trend will continue in the future. Unlike voiceband modems, a busy tone on an ADSL modem prevents a customer from connecting to any network service. New traffic and plant measurements will be required in order to facilitate proper engineering and administration of an ADSL access network. And because subscriber quality of service offering is closely tied to ATU-R and ATU-C modem configurations--both being set to the same data rates--additional cost is incurred in engineering CAP, DMT or QAM modem types for each service type. In the long run, the additional operations costs may exceed the capital gains because of modem pooling architecture. Venkata C. Majeti is Director of Technology Management for Westell Inc., Aurora, Ill.