xDSL uses what used to be known as a "dry pair" or an "alarm circuit". =
It is no more and no less complicated that this:
A pair of copper wires.
What it means is that the local loop baby bell is in the driver seat =
*surprise*. If you heard something other than this you had better clean =
your ears or get selective with your listening.... To survive the xDSL =
game you will need to backbone multiple POP's within a local calling =
area. Distance matters... this is a MAN technology not a WAN technology. =
(Actually, could be classified LAN but I won't get into it....) Last =
year an alarm company could charge $19 a month to "monitor" a microphone =
on the end of that dry pair.... guess what their cost was on the copper? =
Now our local GTE office "no longer offers alarm circuits" because of =
xDSL. Can't get ISDN off-premise extensions either.
Go figure.
Richard K. Marshall
http://www.marshall.net
-----Original Message-----
From: bethe.davis [SMTP:bethe.davis@dcsol.com]
Sent: Wednesday, January 28, 1998 9:47 PM
To: ntisp@emerald.iea.com
Subject: Re: ADSL
I just went to ComNet today and spoke with several manufacturers =
marketing
their ADSL solutions, and everyone without fail insisted that the =
distance
limitations were from the host equipment to the end user equipment. I =
asked
them each specifically if the distance was calculated from each site to =
the
CO, with the distance between COs ignored and they said absolutely not!
They said that the circuit was like a dry loop circuit with the copper =
pairs
going from point A to point B un-interrupted.
That's not what we have been hearing here in other posts, and I don't =
claim
to know myself, that's just was the boys in the suits are saying here in =
DC.
The longest demonstration I saw today was 20K feet, and the connection =
was
under 128K in both directions. So if what they are saying is correct, =
and
you can't connect a customer 20 miles away (using the 5000ft to CO, and
8000ft to CO, with no penalty from CO to CO method) then I don't see how
ADSL is going to be a feasible solution outside of the densely populated
metropolitan areas. If it will work like that, and the sales boys don't
know what they're talking about (I know, I know) then we'd all better =
start
looking for the solution we're going to implement!
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