Your math is correct but the application is incorrect. The OP requested a switch with "solution with VLANs, PoE, and QoS?" By that they would be using the VLANS and QoS for separation of Data / Voice.
Gb uplinks are very useful in Data applications...... Alex Kindly consider the environment before printing this e-mail. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:asterisk-users- > [EMAIL PROTECTED] On Behalf Of Gordon Henderson > Sent: Monday, October 06, 2008 11:29 AM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [asterisk-users] PoE switch recommendations? > > On Mon, 6 Oct 2008, Ken D'Ambrosio wrote: > > > Hey, all. We're rolling out VoIP, and I'm wondering about PoE > > recommendations, as we're going to have to replace our current network > > equipment. My first inclination would be to just plunk down the cash > and > > do a Cisco system, but I'm relatively certain that would get shot down > by > > finance. Any recommendations for a couple-hundred-port solution with > > VLANs, PoE, and QoS? Don't care much if it's in a single chassis or > not, > > so long as it has Gbit uplinks. > > I'm curious as to why you want Gb uplinks on the switches? > > If we assume 100Kb/sec per phone .. (gross rounding, using 100Kb/sec per > phone, rather than ~80 - make the sums easier and builds in a margin) 10 > calls per Mb/sec. > > So for a 24-port switch, 24 phones all talking to 24 extensions off that > switch, the max the uplink port is going to be pushing out is 2.4Mb/sec. > > For 200 extensions, say 9 x 24 port switches, with a single top-level (non > PoE switch) switch with the PBX plugged in along side the 9 downlinks, > that single PBX link will be carrying 2.4*9 = 22Mb/sec if all phones are > in-use at the same time (and the PBX is carrying media) > > Now you may not want to build the network like that, but it seems that Gb > is overkill just for the VoIP side of things. (And with that many > extensions, I would suggest keeping all the phones on one set of switches) > > (Then again, it might not be possible to get big PoE switches without Gb > uplinks, so it might be a moot point!) > > So satisfy my curiosity - why Gb uplinks? > > Cheers, > > Gordon > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > AstriCon 2008 - September 22 - 25 Phoenix, Arizona > Register Now: http://www.astricon.net > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- AstriCon 2008 - September 22 - 25 Phoenix, Arizona Register Now: http://www.astricon.net asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users