[asterisk-users] X100M never goes on-hook state

[Jay R. Ashworth]

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                      jra at baylink.com
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