[cisco-voip] Cisco ISDN noise levels

[Nick Matthews]

-72 dB is basically silence.  Normal voice is around -15 to +2 dB. (kind of
soft to really loud)

For your echo canceller to be happy you need at least 8 dB difference
between the output and the incoming echo, and it must be less than 128ms
apart from the original voice.  The difference is the ERL.

-nick

On Sun, Oct 31, 2010 at 8:19 PM, Cheng, Karen <Karen.Cheng at racq.com.au>wrote:

>  Hey guys,
>
>
>
> Does anyone know whether there is a “recommended” noise level, input and
> output signal level for ISDN calls coming into a Cisco voice gateway?
>
>
>
> I can get the statistics for live calls but not sure what to compare it to
> or whether they are within a reasonable level.
>
>
>
> EG
>
>
>
> CoderTypeRate=g711ulaw
>
> NoiseLevel=-72
>
> ACOMLevel=45
>
> OutSignalLevel=-54
>
> InSignalLevel=-66
>
> InfoActivity=1
>
> ERLLevel=45
>
>
>
> *Karen Cheng*
>
> *Voice Network Engineer*
>
>
>
>
>
> Call RACQ Auto Glass on 13 1905 today for all your windscreen replacement
> and chip repair needs. Members receive 20% off.
>
>
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