[asterisk-users] TDM400p susceptible to EMI?

[Tim Nelson]

----- Original Message -----
> > Many Mini-ITX cases have horrific power supplies to keep overall
> > cost
> > down. 'Cheap' doesn't begin to describe them. They *will* introduce
> > audio issues, especially where you're using FXS modules.
> 
> This box is using a picoPSU-80 80w DC-DC 'power supply' fed from an
> inline
> 'laptop brick.'
> 
> > Also, it could be your system's ability to handle interrupts as that
> > will cause clicks/pops as well.
> 
> Out of 300 samples from dahdi_test, there were 3 'outliers' --
> 70.317%,
> 87.397%, 95.899% which is not comforting, but they don't correlate
> with
> the stream of noise.
> 
> > Third, try putting the card directly into the motherboard. PCI
> > risers
> > can be finicky, especially the 'ribbon style' units. The solid PCB
> > units
> > I've found are typically fine.
> 
> This case will not accommodate that unfortunately. This is a rigid PCB
> unit.
> 

Are you getting these audio artifacts on all channels, or specific ones? FXO vs FXS?

Also, is the card a Digium TDM400P or a 'clone'?

--Tim