[37587] in North American Network Operators' Group
Re: DSL line stealing when there is no tone - DANGER - Operational content
daemon@ATHENA.MIT.EDU (Greg Maxwell)
Wed May 16 18:30:42 2001
Date: Wed, 16 May 2001 16:46:49 -0400 (EDT)
From: Greg Maxwell <gmaxwell@martin.fl.us>
To: Steve Schaefer <schaefer@simone.dashbit.com>
Cc: Alex Bligh <alex@alex.org.uk>, nanog@nanog.org
In-Reply-To: <Pine.LNX.4.33.0105161259460.8776-100000@simone.dashbit.com>
Message-ID: <Pine.GSO.3.96.1010516164452.5312H-100000@da1server>
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Errors-To: owner-nanog-outgoing@merit.edu
On Wed, 16 May 2001, Steve Schaefer wrote:
> The main reason not to stick a tone on the DSL line is that the line
> coding (2B1Q) used by SDSL uses the baseband (low frequency part of the
> spectrum).
>
> For line codings that don't use the baseband (CAP, DMT and variants like
> G.lite), the DSLAM (telco central office DSL equipment) is always set up
> so that the DSL can be combined with a voice circuit over the same pair,
> so it still doesn't put a tone on the line.
I predict great profits for the first person to duct tape 100 'tracer
tone-generators' into a 23 inch rack with 48v DC power source.
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