On 1/31/06, Damon Estep <[EMAIL PROTECTED]> wrote: > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:asterisk-users- > > [EMAIL PROTECTED] On Behalf Of C F > > Sent: Tuesday, January 31, 2006 4:03 PM > > To: Asterisk Users Mailing List - Non-Commercial Discussion > > Subject: Re: [Asterisk-Users] 5,000 concurrent calls system rollout > > question > > > > I don't know how much 1+1 by you is, but lets recalculate this for a > > moment: > > First the bandwidth per channel: > > http://www.airewaves.com/aire/support/bandwidth_explain.php > > 1.5mbps (mega *BITS* not BYTES per second) to a full T1, which equals > > 1536 Kbits, each channel then takes 64kbps. > > 64*5,000=320,000kbps. > > 32,000/1,024=312.5 Mbps (round off to Mbps), no where close to a Gb. > > Every single PC made in the last 4 years I came across, can handle > > this type of bandwidth. > > BTW, this all amounts to just over 39 MBYTES per second. > 312.5/8=39.0625 > > > > Not that I disagree with your point, the bandwidth is not huge, but the > math is a little fuzzy;
No it's not, the math was meant for the T1 calculations, reread the post I replied to. > > First of all, a g.711u stream over UDP is closer 80k than 64k, the > payload is 64k + udp overhead + IP overhead. > > Now consider that the call is originated as SIP (llok back a few days in > the thread), and lets assume the call goes to an external hard or > softphone, and lets also assume that there is a reason to keep the RTP > stream running through asterisk (monitoring, recording, transferring, > dtmf, ability to re-enter IVR, etc). > > I make all the assumptions safely since the thread was started by > someone looking to set up a large call center and I have followed thread > out of curiosity. > > So a 80k full duplex RTP stream originates on media gateway somewhere, > hits the asterisk box, is internally bridged, and is sent back out to a > phone somewhere. My math says this puts a 160kbps full duplex load in > the NIC. > > Ok, now lets go for 5000 of them. 160kbps*5000=800000kbps or 800mbps - > full duplex. > > Have you ever seen a NIC or switch that can run GigE full duplex at 80% > utilization and not at least start to fall apart? > > To get to a comfortable load you would need 2x GigE NICs (for ~40% > utilization), of course now we are adding additional overhead for the > bonded NIC trunking protocol. > > Is still contend this is not practical without multiple very high end > servers and round robin call origination from the upstream provider > delivered over something like GigE or OCx. > > Maybe someone will step up and post some real-world application limits > based on experience... > > > > > > > > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > Asterisk-Users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
