Andrew D Kirch wrote:
I am currently running Asterisk 1.2.8, on an AMD Sempron 3100+ (ASUS K8N
Nforce based board). I am using a Digium wctdm24xxp to terminate 8 (2x
quad) FXO lines. Using ztmonitor (From zapata) I cannot see that there is
any registerable incoming volume from these lines. I've been running them
at rxgain = 25 (zapata.conf) to make the audio audible, however this
creates poor call quality issues (static and distortion) on most calls,
and audio garble in voicemails. Fxotune fails for every line with "Could
not fill input buffer"
I've tried changing PCI slots, played with echo settings, and done
everything else I can think of to make this card play nice to no avial.
Anyone with solutions or ideas, your input will be greatfully appreciated.
As others have already noted, start with rxgain & txgain set to 0. And,
check the lines with an analog phone to ensure you don't have weak audio
from the pstn line to start with.
If you do have weak audio (as in a very long pstn line), you're not
likely to get the TDM400 or TDM2400 card to compensate for the loss
without seriously impacting the s/w echo canceler.
For high loss pstn lines, ztmonitor will not provide any useful indication.
If you approach the problem from a professional perspective, you would
use a transmission test set to measure the loss of the pstn line by
dialing into the central office milliwatt generator (no asterisk
involvement). If that measured pstn loss is anything greater then about
7db to 10db, I'd contact your pstn provider to see if there is anything
they can do to improve it. (Most US telco's can install repeaters in the
central office that will boast the audio levels. Repeaters have been in
use by telco's for at least 20 years, and are typically used on long
rural pstn lines.)
If the analog audio is reasonable (or your measured pstn loss is less
then about 7db), then you've got something wrong with the TDM2400
installation. That "could" be something like a mis-wired TDM2400-to-pstn
line connections, etc. It will have nothing at all to do with the pci
bus, interrupts, etc.
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