-72 dB is basically silence. Normal voice is around -15 to +2 dB. (kind of soft to really loud)<br><br>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. <br>
<br>-nick<br><br><div class="gmail_quote">On Sun, Oct 31, 2010 at 8:19 PM, Cheng, Karen <span dir="ltr"><<a href="mailto:Karen.Cheng@racq.com.au">Karen.Cheng@racq.com.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-AU">
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<p class="MsoNormal">Hey guys,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Does anyone know whether there is a “recommended” noise level, input and output signal level for ISDN calls coming into a Cisco voice gateway?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I can get the statistics for live calls but not sure what to compare it to or whether they are within a reasonable level.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">EG</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">CoderTypeRate=g711ulaw</p>
<p class="MsoNormal">NoiseLevel=-72</p>
<p class="MsoNormal">ACOMLevel=45</p>
<p class="MsoNormal">OutSignalLevel=-54</p>
<p class="MsoNormal">InSignalLevel=-66</p>
<p class="MsoNormal">InfoActivity=1</p>
<p class="MsoNormal">ERLLevel=45</p>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal"><b><i><span style="font-size: 10pt; color: rgb(0, 52, 120);">Karen Cheng</span></i></b><span style="font-size: 12pt; font-family: "Times New Roman","serif";"></span></p>
</div>
<div>
<p class="MsoNormal"><i><span style="font-size: 10pt; color: rgb(0, 52, 120);">Voice Network Engineer</span></i><span style="font-size: 12pt; font-family: "Times New Roman","serif";"></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size: 12pt; font-family: "Times New Roman","serif";"> </span></p>
</div>
<p class="MsoNormal"><span style="font-size: 12pt; font-family: "Times New Roman","serif";"> </span></p>
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