Here's another one: http://www.bandcalc.com/
Regards, Ovidiu Sas On 7/23/07, Bill Sandiford <[EMAIL PROTECTED]> wrote:
After my last post, I did a bit of googling and found this calculator. It seems to be giving numbers that are very close to our real world tests. http://blog.asteriskguide.com/bandcalc/bandcalc.php Regards, Bill ----- Original Message ----- From: "Bill Sandiford" <[EMAIL PROTECTED]> To: "Aloysius Thevarajah Lloyd" <[EMAIL PROTECTED]>; "TAUG" <[email protected]> Sent: Monday, July 23, 2007 11:15 PM Subject: Re: [on-asterisk] VOIP Bandwidth - Calculation > As Phil described, its much more than 8 kbps, and the lower the frame > rate, the more bandwidth it takes due to the packet overhead. While > turning up our softswitch, we did a bunch of testing with different codecs > at different sample/frame rates on ethernet. Here are my *real world* > results: > > g711 (ulaw) > 10ms frame ~= 126.5 kbps > 20ms frame ~= 95.2 kbps > 30ms frame ~= 84.7 kbps > 40ms frame ~= 79.6 kbps > > g729a (8 kbps) > 10ms frame ~= 70.5 kbps > 20ms frame ~= 39.2 kbps > 30ms frame ~= 28.8 kbps > 40ms frame ~= 23.5 kbps > > We didn't test GSM. > > So, most ADSL providers (including us) offer sync rates at speeds up to > 800 kbps, however that speed is if the traffic is ATM (which it isn't), so > by the time you add IP/Ethernet overhead, the 800 kbps speed usually gives > you a payload somewhere around 670-690 kbps. So divide that by one of the > numbers above and round down and you will have your *theoretical* max > simultaneous calls assuming the connection is only used for VoIP. Now > throw in a few users and their email and web traffic and the number starts > to go down. > > Hope this helps you out. > > Regards, > Bill > ----- Original Message ----- > From: "Aloysius Thevarajah Lloyd" <[EMAIL PROTECTED]> > To: "TAUG" <[email protected]> > Sent: Monday, July 23, 2007 9:52 PM > Subject: [on-asterisk] VOIP Bandwidth - Calculation > > >> Hi, >> >> For a 10 SIP /g729 simultaneous use. What is the Best internet connection >> recommended. >> >> DSL or ADSL >> >> What is the upload and download speed required? How to calculate the the >> band width? ( g729a - 8 kbit/s 10 ms frames) >> >> if u can guide me greatly appreciated. >> >> Thank you >> -- >> Lloyd >> > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
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