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Anciso, Roy wrote:
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<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">Also I called Digium about this and their
tech support does not
recommend using their HLEC software canceller on T1 cards since it
consumes so
much CPU. I was ready to get the license keys for HLEC but when I was
transferred
to sales person they would not give me the keys stating that I have to
have an analog
card to obtain the license. <o:p></o:p></span></font></p>
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<font size="3"><font face="Times New Roman"><br>
I've had this argument with Digium before -- their position is a crock.
As you can see from my analysis below, one can certainly run the HPEC
on a full T1 PRI span if you have a fast enough processor. Digium,
however, has made the business decision not to provide HPEC keys for
their T1 card for reason they do not explain and which I cannot fathom.<br>
<br>
We installed a customer with a TE120 and a fractional PRI (12 B
channels). We asked for an HPEC key which they gave us (now, they
claim, by mistake) and it works fine -- solved all echo problems and no
CPU problems.<br>
<br>
Would presume (hope) Digium, would sell you an HPEC licence as they do
for non-Digium analog hardware -- a 23-channel licence would cost $230
-- might be cheaper than going to Sangoma. Or perhaps go to Sangoma to
teach Digium a lesson?<br>
<br>
Here is my analysis of CPU power required to run HPEC on a full PRI
span:<br>
<br>
1. The Digium website says: "8 channels at 1024 taps requires 3GHz P4"<br>
<br>
2. If we look at the SPEC2000 results for this processor, we find
(<a class="moz-txt-link-freetext" href="http://www.spec.org/cpu2000/results/">http://www.spec.org/cpu2000/results/</a>) that a 3GHz P4 has a CINT2000
per CPU rating of roughly 1200 and a CINT2000 rate of 12. (I'm using
the older SPEC2000 benchmark because the older P4 processors are not
included in the SPEC2006 result database.)<br>
<br>
3. If we look at the SPEC2000 results for, say, an Intel X3210
Quad-Core Xeon, we find each core rates about 2200 (i.e. 8800 for the
system), and the system as a whole has a CINT2000 rate of 90.<br>
<br>
In summary, an X3210 processor has roughly 7.5 the processing power of
a 3GHz P4, therefore, it ought to be handle roughly 7.5 x 8 channels or
60 channels. Therefore, handling a single T1 span (23 channels) ought
to be easy.<br>
<br>
If anyone on this list spots a flaw in this analysis, please let me
know.<br>
<br>
Let us know what you decide to do (and, if you purchase an HPEC licence
for your T1 card, the results).<br>
</font></font>
<pre class="moz-signature" cols="72">--
George Pajari (dCAP), netVOICE communications 604 484 VOIP(8647) x102
<a class="moz-txt-link-abbreviated" href="http://www.netvoice.ca">www.netvoice.ca</a> <a class="moz-txt-link-abbreviated" href="http://www.ip-centrex.ca">www.ip-centrex.ca</a> <a class="moz-txt-link-abbreviated" href="http://www.ip-pbx.ca">www.ip-pbx.ca</a> <a class="moz-txt-link-abbreviated" href="http://www.vpas.ca">www.vpas.ca</a>
<a class="moz-txt-link-abbreviated" href="http://www.digium.ca">www.digium.ca</a> <a class="moz-txt-link-abbreviated" href="http://www.grandstream.ca">www.grandstream.ca</a> <a class="moz-txt-link-abbreviated" href="http://www.sipura.ca">www.sipura.ca</a> <a class="moz-txt-link-abbreviated" href="http://www.snom.ca">www.snom.ca</a>
Open Source VoIP/Telephony Specialists 1 877 NET VOIP (638 8647 x102) </pre>
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