[asterisk-users] PoE switch recommendations?

[Jerry Jones]

The times they are a changing - or something like that.

while gb on phones is not the norm today, it s becoming more so on the  
higher end flavors and will continue to do so

since the life span of your switches will be several years, thinking  
ahead is a good thing

my only concern is having too many poe ports in a single switch,  
especially if it is a 1U model, running many with 24 ports poe I have  
had failures after a year or so. And with the new POE+ spec coming  
this will get even worse. Think adding more fans = more noise to get  
rid of the additional heat they generate


On Oct 6, 2008, at 12:04 PM, David Gibbons wrote:

> Right, it takes some doing to find a 1Gb switching phone though we  
> ended up going with a system based on the Cisco 7941G-GE. This model  
> supports all of the needed features including vlan tagging and 1Gb  
> switching.
>
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com 
> ] On Behalf Of Robert Augustyn
> Sent: Monday, October 06, 2008 12:01 PM
> To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
> Subject: Re: [asterisk-users] PoE switch recommendations?
>
> Most phones support only 100M switching though .... Unless you run  
> separate
> cabling for VoIP and data but then you would not need the 1G uplink.
>
>> -----Original Message-----
>> From: asterisk-users-bounces at lists.digium.com
>> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of
>> David Gibbons
>> Sent: Monday, October 06, 2008 11:48 AM
>> To: Asterisk Users Mailing List - Non-Commercial Discussion
>> Subject: Re: [asterisk-users] PoE switch recommendations?
>>
>> Obviously we don't need 1Gb connections for VOIP :)
>>
>> Phones support pass through to the desktop and VLAN tagging.
>>
>> The need for 1Gb ports comes from wanting to have 1Gb at the desktop.
>>
>> Dave
>>
>> -----Original Message-----
>> From: asterisk-users-bounces at lists.digium.com
>> [mailto:asterisk-users-bounces at lists.digium.com] 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
>>
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