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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here -- Ignore unavailable to you. Want to Upgrade?

To: Ray Jensen who wrote (1658)	7/24/1998 7:59:00 AM
From: MikeM54321	Read Replies (1) \| Respond to of 12823

"This stuff gets pretty expensive when you add it on in addition to the switch....Also, they lacked the inside track on keeping up with the all important switch interfaces for the HDT, something that gives Nortel an edge over the others." Ray, Now we're getting to the really important stuff (since I've been a long time follower of the networkers :)). The switches that are able to be used in an HFC network! Can you expound on these words, "switch interfaces for the HDT," a little more. Specifically, are you saying the HFC network has some special obstacles that make it more difficult to interface, than say any old (if there is such a thing) fiber network? I thought all data networkers had products that could be dropped into an HFC network relatively easy. But I was totally guessing at that. Thanks, MikeM(From Florida)

To: Ray Jensen who wrote (1658)	7/24/1998 10:48:00 AM
From: DenverTechie	Respond to of 12823

Ray, nice to see a fellow HFC telephone veteran post here. ADC had a first generation QPSK based system that we trialed in Rochester. Worked great in the lab, terrible in the field. Back to the drawing board. Second generation system, dubbed Homeworx, uses OFDM (orthogonal frequency division multiplexing) to get more circuits per given amount of spectrum. It also has better immunity to narrowband interference than QPSK systems. Drawbacks are: increased complexity, higher cost, more power consumption, and more difficult frequency agility algorithms than QPSK. MediaOne (US West Multimedia Group/Continental Cablevision) picked it as the primary vendor for their Atlanta systems due to better spectrum efficiency in dense areas. Many, many teething pains so far, but it is maturing slowly. Second vendor chosen for less dense deployments is Tellabs with their Cablespan 2000 system (with a system architecture that I particularly like).