[Asterisk-Users] Problems with TDM40P

[The Traveller]

Heya all,

I'm experiencing some problems with a TDM40P and was wondering if
anyone else on this list has similar experiences, or maybe even
a possible solution.

My setup is a dual PIII-750 with 1 gig of RAM, with an X100P, connected
to an analog line to my telco, and a TDM40P with analog phones
connected.  The TDM-card is not sharing any interrupts, but the
X100P is, with the 2 Adaptec SCSI hostadapters on the mainboard.
There's only a tapestreamer on one of them, though, and it's mostly
idle, as I only use it during backups.  Not loading the SCSI-drivers
at all doesn't make any difference in the problems below.
All of the disks in the machine are IDE, and those controllers have their
own interrupts.

My problems with this setup are as follows:

- I hear a soft fading hiss in the background on the TDM40P-connected
phones.  It's also present when I call something like voicemail
or a conference on my local box, so it doesn't seem to come from
the X100P.  If I uncomment the "NO_CALIBRATION"-option in the Zaptel
Makefile, the hiss decreases in volume, but is still audible.

- Some of my TDM40P-connected phones go dead frequently.  By "dead",
I mean that the line-voltage goes away, so there's nothing there when
they're picked up.  When this happens, the remedy is to call that
extension and let it ring once, or restart Asterisk, after which the
line-voltage re-appears.  I have this problem with several different
phones and know at least 1 other person with similar problems.

- Making data-calls from a line on the TDM40P, through the X100P, to
an external number is almost impossible.  Even 2400bps is unreliable,
and anything higher than that usually doesn't even connect.  Voice-
calls sound very clear, though.  I suspect it might have something
to do with the first problem above, as I've also tried data-calls
between ports on that same TDM40P, with the exact same results.  I've
even tried a completely different TDM40P, so it's unlikely to be
a hardware-problem with that.  The afforementioned "NO_CALIBRATION"-
option seems to make a slight difference in the quality of data-calls,
but not much.



   Grtz,

      Oliver