[AusNOG] Single Switch Full 48-Port PoE Support

[Tim March]

Thanks everyone for the on and off-list suggestions. We've got a list of
devices to look at now. Much appreciated.

@ Peter - The way I'd read the documentation the (Non PoE+ / .3at) Cisco
2960 will see the Class-4 advertisement, treat it as unsupported and
default it to Class-0, which is 15.4W per port?

Either way, I reckon we're on the right track now... Thanks again all...



Cheers,
T.

On 11/09/13 9:07 PM, Peter Childs wrote:
> 
> http://support.polycom.com/global/documents/support/technical/products/voic
> e/Power_Consumption_TB_48152.pdf
> 
> 2) VVX 500 and VVX 600 advertise as Class 4, in conformance with
> IEEE802.3at specification
> (backwards compatible with IEEE802.3af).
> 
> 
> If they don't do that I would chat to Polycom as they often have lots of
> software updates :)
> 
> On 11/09/13 11:39 AM, "Tim March" <march.tim at gmail.com> wrote:
> 
>>
>> Hey Guys...
>>
>> A customer of mine needs to replace a bunch of non-PoE 48-port switches
>> with PoE switches. Each of the switches will be required to power 48 IP
>> phones. Due to a range of circumstances all relating to planning
>> failures we need to use like-for-like form-factor ($n x 48 Port PoE
>> Switches) to drive the phones.
>>
>> The phones are Polycom VVX 500 that draw a maximum of 5W per port for a
>> total of 240W per switch. We've bene looking at 2960's and this fits
>> nicely within it's 370W PoE budget. However, the .3af advertisement from
>> the phone gets interpreted as Class-0 (15.4W) and the switch will only
>> power >= 28 devices concurrently.
>>
>> On the Catalyst we're able to get around this (I think?) with the `power
>> inline max` config directive to force it to spread the power budget
>> across all ports.
>>
>> For what we're trying to do a set of 2960's will come in around $25k.
>>
>> My question is: Can any of you guys suggest cheaper switches that will
>> allow us to run 48 x 5W PoE from a single device with the ability to
>> ignore the 15.4W .3af advertisement that will tell the switch to shut
>> down the additional ports?
>>
>>
>>
>> Cheers,
>> T
>>
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> 
> 

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