[Asterisk-Users] Line Noise UPDATE - If you've got line noise, read this

[Paul]

This is an update to the message title LINE Noise HELP! Regarding the static
that floods the line and makes continuing a conversation impossible. This
was happening on my SIPura-841, but Damian on the list was experience this
same problem with POTS phones as well through his TDM400. Below is an
excerpt of what I recently sent to Damian as we've been trying to figure
this out.


Well here’s the deal with my box. I had a Celeron 400 w/ 128mb of ram and an
UATA66 HD. I finally got fed up with the static on the phone(because it
would basically cut the conversation off), so I went out and bought a brand
new system. Sempron 3000+, 512MB pc3200, 160GB UATA100
..fresh install of
asterisk and zaptel and RH9. I have two X100P FXO cards in my box. Prior to
upgrading I ran zttest and observed the results
.they were something like an
average of 99.96XX
which is below what digium is recommending. So I went and
upgraded. I tested the phone for a little over 20 minutes and it never cut
out or went static one single time, however, it was making a beeping type
sound in the background. It was sporadic and varied in volume.  I have no
idea what is causing it, but at the moment I’m quite relieved that it’s no
longer(crossing my fingers) cutting my phone calls off. I ran a zttest on
the new box and the outcome was much better, 99.987 for most of them, an
occasional 100% and sometimes it would dip down an go to 2%, 40%, 70%,ect.
But the test ended and the average was above 99.98. This whole damn thing is
quite frustrating, more so for you I can imagine. I hope we’re closer to a
solution now. Have you seen anyone else on the list that has found a cure or
workaround? BTW, I was running samba and I stopped the service, but the
static continued. (We thought Samba might be part of the problem as my
TCPDUMP showed netbios activity at the exact time the line went south...no
dice though)


Update further...The first conversation on the phone had the beeping as
described above, it occurred throughout the conversation. All of the
subsequent calls made (about 5, all less than 5 minutes) have been crystal
clear and I couldn't tell the difference from that or my POTS phone
connected to the local loop. 

I do have a concern though, if the TDM400 is so seemingly problematic, what
else could one use to connect multiple analog phones to the box??? 


Cheers,

 
Paul Shiflet