Re: [asterisk-users] Digium TE120P versus Sangoma A101D-X

[George Pajari]

Anciso, Roy wrote: 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.  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. 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. 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? Here is my analysis of CPU power required to run HPEC on a full PRI span: 1. The Digium website says: "8 channels at 1024 taps requires 3GHz P4"   2. If we look at the SPEC2000 results for this processor, we find (http://www.spec.org/cpu2000/results/) 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.) 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. 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. If anyone on this list spots a flaw in this analysis, please let me know. Let us know what you decide to do (and, if you purchase an HPEC licence for your T1 card, the results). -- George Pajari (dCAP), netVOICE communications 604 484 VOIP(8647) x102 www.netvoice.ca www.ip-centrex.ca www.ip-pbx.ca www.vpas.ca www.digium.ca www.grandstream.ca www.sipura.ca www.snom.ca Open Source VoIP/Telephony Specialists 1 877 NET VOIP (638 8647 x102)

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