TELECOM Digest OnLine - Sorted: Re: How Long Can a Telephone Extension Cord Be?

Re: How Long Can a Telephone Extension Cord Be?

Phil McKerracher (phil@mckerracher.org)
Mon, 15 Aug 2005 21:29:07 GMT

John Levine <johnl@iecc.com> wrote in message
news:telecom24.366.5@telecom-digest.org:

> I think the limit is about 18,000 feet. Then you might have trouble
> carrying DSL over it ...

Correct, but that's the approximate limit for the total length from
the switch to the telephone. Beyond that, the signal is typically
attenuated too much, mainly by cable resistance, and gets buried in
noise.

As someone else has pointed out, you need decent cable, routed clear
of sources of interference (such as power cables and cordless phones),
otherwise interference will be a bigger problem than loss of signal.

Phil McKerracher
www.mckerracher.org

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