If you are running a Cisco VoIP
gateway you can send a 0dBm 1000Khz test tone into or out of a voice port
with:
"test voice
port <port#> inject-tone network 1000hz"
to measure the tone do
a:
"sh call active voice
brief"
>>Another common problem that
causes echo in networks is not setting your
>>loss plan correctly. You need to be sure that you aren't coming in too
>>hot at any of your analog interfaces. In general you should see a signal
>>between -20dbm and -12dbm when someone is talking on the line. If it is
>>significantly hotter then you run the chance of having a larger reflected
>>signal resulting in echo. I typically try padding down analog levels by
>>3dB at a time to see if echo is reduced.
>How do you measure the amplitude of a pstn line? As an audio engineer in a
>previous life, I would love to be able to send standard level tones down a
>pstn line and measure the amplitude at my end, then adjust the input gain
>accurately. Is there a way to do this?
>>loss plan correctly. You need to be sure that you aren't coming in too
>>hot at any of your analog interfaces. In general you should see a signal
>>between -20dbm and -12dbm when someone is talking on the line. If it is
>>significantly hotter then you run the chance of having a larger reflected
>>signal resulting in echo. I typically try padding down analog levels by
>>3dB at a time to see if echo is reduced.
>How do you measure the amplitude of a pstn line? As an audio engineer in a
>previous life, I would love to be able to send standard level tones down a
>pstn line and measure the amplitude at my end, then adjust the input gain
>accurately. Is there a way to do this?
smime.p7s
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