mailing list archives
Re: Microsoft offering xDSL access
From: "Jay R. Ashworth" <jra () scfn thpl lib fl us>
Date: Fri, 23 Jan 1998 10:20:31 -0500
On Fri, Jan 23, 1998 at 02:23:19AM -0500, Deepak Jain wrote:
UUNET doesn't own dedicated single-circuit copper to people's houses.
If xDSL can only run about 18kft end-to-end, to service a wide metro area
like Washington, D.C. one would either have to have a POP within every 6
mile radius (fed by conventional circuits) or backhaul the data (by
conventional circuit) to their POP.
Is this correct, if not, what am I missing?
That's correct. DSL is a baseband technology, running over copper.
Read: layer 1. The only practical place to put DSL headends right now
is in RBOC CO's. No one else has the point to point copper -- it's not
a multiplexed layer 1 service like cablemodems.
Oh, and sorry, backhauling isn't an issue. The DSL modem at the
opposite end of the line from the customer _has to physically be
there_. Once you grab the signal and turn it into some other layer 1
format, you can mux it and back haul it, but that doesn't solve the
problem at hand.
Jay R. Ashworth jra () baylink com
Member of the Technical Staff Unsolicited Commercial Emailers Sued
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