[AusNOG] Single Switch Full 48-Port PoE Support

[adam baxter]

2960X Will do 48 Ports @ 15.4

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps12995/data_sheet_c78-728232.html


On 11 September 2013 12:09, 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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