On Fri, Apr 11, 2008 at 11:43:19PM -0300, Marlon Dutra wrote:
> If I put an DSL filter in series with the line and the card, IT WORKS
> PERFECTLY!!! The filter imposes 25 ohms over the circuit. Maybe that's
> causing the card to work. When I put the filter and the ammeter in
> series, I get zero amper when on-hook and 26 mA when off-hook, that's
> the expected behaviour.
It's possible the 'line relay' on that card is not a physical relay,
but electronic, and that its sensitive to too much loop current -- and
the DSL filter drops the current far enough for that 'relay' not to
pull in spuriously.
Telecom guy Mike Sandman has a paper on loop current on his website:
http://sandman.com/loopcur.html
and, come to that, lots of *really* cool stuff for sale as well; if
you've never looked at his site, do.
Cheers,
-- jra
--
Jay R. Ashworth Baylink [EMAIL PROTECTED]
Designer The Things I Think RFC 2100
Ashworth & Associates http://baylink.pitas.com '87 e24
St Petersburg FL USA http://photo.imageinc.us +1 727 647 1274
Those who cast the vote decide nothing.
Those who count the vote decide everything.
-- (Joseph Stalin)
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