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
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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