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Edited on Sun May-02-04 12:47 PM by BigMcLargehuge
is that you use a dedicated line from the DSLAM (digital subscriber line access multiplexer) installed in the Central Office to your DSL modem. From the DSLAM, your traffic is multiplexed right along with everyone else into the public internet. The DSLAM provides a wonderful place for Ashcroft, should he want to, install a trapper and log every site you visit, every mail and newsgroup you receive, and every IM conversation you have.
The other security feature it offers is a dynamic IP address, as you have to "dial in" to DSL using a POET dialer (basically spoofing a phone call to alert the switch that you want access). Each time you use the POET dialer you receive a new IP address. POET dialers, are notoriously buggy. I have to use on through Verizon and I was lucky to connect once out of ten tries, and even then I could lose the connection at any monment. I lived less than a kilometer from the CO so my speed was as advertised, about 700K. With cable I receive an average of 3 megs.
CATV systems offer dynamic IP service too, but tend to rotate through addresses on a daily/weekly basis with no interruption in service. You service is multiplexed through the neighborhood node and separated from other traffic via a variation of frequency division multiplexing.
You can generally beat all of CATV service's caveats with the purchase of a simple router. I have a Netgear that cost 60 bucks and offers Network Address Translation (so that all my computers are invisible) plus hardware firewall.
and as for bandwidth sharing... that was probably an issue five or ten years ago, but most companies offering digital/data service use Fiber to the Curb and even in very dense areas, have terabytes of bandwith from the headend to the neighborhood node, and hundreds of gigabits from the neighborhood node to your residence.
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