[asterisk-users] TDM 400p and Noise on the line

[robert boardman]

Hi

I wonder if anyone has any sugestions


I have had a TDM400 for a couple of years, and I have always had problems
with noise on the line, so tonight I have been doing some research and have
found that if I load the CPU  dahdi_test has almost perfect results and no
noise

dahdi_test
Opened pseudo dahdi interface, measuring accuracy...
99.997% 99.999% 99.998% 99.997% 99.999% 99.998% 99.998% 99.998%
99.998% 99.998% 99.998% 99.997% 99.998% 99.997% 99.998% 99.998%
99.998% 99.998% 99.998% 99.997% 99.999% 99.998% 99.998% 99.997%
99.998%
--- Results after 25 passes ---
Best: 99.999 -- Worst: 99.997 -- Average: 99.997895, Difference: 100.002028



but when the CPU is not loaded there is white noise low volume and the
results of dahdi_test

dahdi_test
Opened pseudo dahdi interface, measuring accuracy...
99.992% 99.988% 99.951% 99.991% 99.992% 99.992% 99.992% 99.992%
99.991% 99.991% 99.992% 99.991% 99.991% 99.952% 99.992% 99.992%
99.992% 99.992% 99.951% 99.992% 99.992% 99.992% 99.992% 99.950%
99.991% 99.991% 99.991% 99.992% 99.992% 99.951% 99.992% 99.992%
99.992% 99.991% 99.952% 99.992% 99.992% 99.991% 99.992% 99.951%
99.991%
--- Results after 41 passes ---
Best: 99.992 -- Worst: 99.950 -- Average: 99.984461, Difference: 100.001168


Could you explain how I can improve the call quality without  running the
CPU at 99% al the time?

running the latest Dahdi  2.4.0 Echo Canceller: OSLEC and asterisk  1.6.2.13

Thanks

Robb
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