Steven Critchfield wrote:
On Fri, 2004-05-14 at 16:12, Elliot Eichen wrote:
Does anyone know (appoximately) the max loop length that the FXS module on a
Wildcat TDM400 card will drive an analog phone(over standard - say cat3 or
26 gage twisted-pair wire). It's clearly not going to be 18kft, but perhaps
4000 feet?
I'd be wary of 4kft even if it could do it. Thats a long way for
something to short/introduce power and fry your complete computer. It
would be pretty easy to put a cheap pc local and run a few feet of
cable. This is especially true if you run more than one line.
Shorts won't be a problem since any reasonably designed FXS interface
has current limiting. In fact, it's this current limiting and the
relatively low loop voltage (I'm guessing 24V on a card of this type)
that will restrict usable loop length. As you point out, induced
transients are also a problem. So if you have a long loop make sure you
put telco surge arrestors on each end.
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