Noise in FXO ports A1200P

Hi jsjc:
1) Check the IRQ, make sure system handle IRQ properly
you can ran this command to check it : cat /proc/interrupt
2) Use zttest to check the result
if you use dahdi , ran the command: dahdi_test
if you use zaptel , ran the command: zttest
make suer the result is higher than 99.98%
3) Disable the X window and framebuffer(set vga=normal from grub)
ran the command: vi /etc/grub.conf
add the line on the kernel line: vga=normal
the points 4,5,6, you can do as the examlpls on the Troubelshooting Q61
you also can refer this: http://downloads.openvox.cn/pub/misc/A800P-A1200P_FAQ(English).pdf

i] Last edited by xin.liu at 2010-3-30 09:19 [/i

Hello,
what are your software environments? If you pay more attentions to this BBS, you can get many helps which match with your case(noise issues).
Anyway, if you do have this issues, maybe the following places you should note.
1. country format( /etc/dahdi/system.conf, the parameters defaultzone and loadzone) if you use zaptel driver,then you have to replace /etc/dahdi/system.conf by /etc/zaptel.conf .Another parameter in /etc/asterisk/indication.conf names country also should be set to your country format.
2. the interrupts of the card. Make sure A1200P has its own interrupt. Execute command(cat /proc/interrupts) to scan it.
3. execute zttest or dahdi_test and post its result here!

any question,please let me know!

Hello,
I found out that the card is sharing IRQ with usb port.
As well the dahdi_test gives numbers lower than needed.
My system is ubuntu, asterisk 1.6.2.6.

I will move the pci card to the other slot and see if I am lucky!

Will keep you informed,

Cheers,

Javi

hello:
there is no harm to share an IRQ with inactive USB or you also can disable the USB from BIOS.

Then if there is no harm having same IRQ why there is noise?

I dont know what could be then....

Is there any way to assign different IRQ by software?? ... so I could check if that is the issue.

Ok I been following the troubleshoot in Q61.
1. IRQ seems to be handled properly just sharing with USB UHCI Device.
2. Dahdi_test gives me low results...
3. Do not have X windows running
4. I am using sata so no problems with IDE.
5. The command says at the end #wcfxo is just for the xctdm or opvxa1200 as well? anyway I done it...
6. Exec the latency timer setting but changing for my device info.

Still same situation. What should I try to do?