On Tue, 1 Jun 2004, Peter Flynn wrote:
> I see most broadband suppliers are claiming you don't need two
> lines: you can make voice calls on your broadband line. Does this
> really work,
Seems to work anyway! DSL is always-on, and out-of-band; it runs at much
higher frequencies than the 3.4kHz limit on a normal phone line, so the
way it works is you get a filter/splitter which plugs into your main phone
jack; the DSL modem plugs into one side, all your phone extensions into
the other. Without the filter your DSL doesn't work so well, because most
of the higher frequencies get dissipated in your phones (which you hear as
masses of interference). If plugging all your phone extensions into one
side of the splitter would mean rewiring, you can get individual filters
instead; this works too, but then you have to put one on every socket.
cjb
http://ocean.ucc.ie/~cjvdb1/
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