[AusNOG] Single Switch Full 48-Port PoE Support

[Peter Childs]

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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