[Asterisk-Users] Squeaking / chirping on ZAP Digium TDM400P

[Robert Webb]

On Fri, 1 Apr 2005 16:42:54 -0500
  "Kellner, Peter" <Peter at PeterKellner.net> wrote:
> 
> I've got an asterisk server 1.07 with a Digium TMD400P 
>(2fxo;2fxs).  I
> have it configured to answer an incoming line and 
>transfer to one of the
> 2 fxs's and it works.
> 
> I have noticed that on incoming calls I get intermittent 
>squeaks and
> chirps on the line that I don't get if I plug the 
>incoming line to a
> PSTN.  I'm the only conversation on this hardware and it 
>is a 2.2Ghz P4
> with 512Meg RAM.
> 
> Any ideas on what or how to look for this problem?
> 
> Thanks,
> 
> -Peter

Could be an interrupt conflict. Do a "cat 
/proc/interrupts" on a linux command line and see if the 
TDM is sharing an interrupt with another device.