Amati vs Westell, DMT vs CAP ADSL Message Board

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Technology Stocks : Amati vs Westell, DMT vs CAP ADSL

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Nov 5 3:50 PM EST

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From: Ken Peterson	4/23/1996 9:24:00 PM
	of 1365

So what does all this mean to ADSL? 1. ISDN is entirely inferior for 2 reasons. The first is that it is not fast enough, the second that it has to receive special treatment to be switched at a central office (where all your calls are switched locally to the rest of the network). When ADSL gets to the C.O., it is met by an ADSL 'un'modem (for lack of a better word) that translates it to look like any other regular phone line that can be switched by ATM or conventional phone switches. The one advantage ISDN had was that of using the existing copper (DS0) infrastructure which the telcos will fight tooth and nail to squeeze every penny from. ADSL is a hands down winner because it is cheaper at the customer location (1 copper line vs. 2), cheaper at the central office, and faster. 2. ADSL is a standard for copper. The same theory can be applied to coax to achieve results that will kill ADSL. This is being worked on now by NT/BNR for the cable companies' networks. However, security is an issue on the current cable network layout. The current topologies will allow about 30 lines to have shared access. Someone in your neighborhood or apartment building, if so inclined, could demultiplex your signals to and from and see what you are transmitting. This is no easy task, but if you are paranoid about security then it is a possible concern. Cable faces two main barriers. First the infrastucture has to be built. This could take 5 to 10 years. Second the security issue has to be solved. 3. The telcos could bring fiber to the home, but it is not economical or needed yet. In this massive expansion of bandwidth we've seen the telcos have consistently been the bottleneck. They will continue to be because they come from a conservative utility minded background. If you made it this far, congratulations. Hope it helps. Its my opinion that ADSL and its children (HDSL,VDSL) will be the dominant transmission option as an onramp to the net for at least 10 years to come. I don't think you can go wrong choosing any of these early players. I still haven't seen anyone here who knows the difference between CAP and DMT. If anyone can explain please do so. I haven't seen any specs on either yet.

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