[AusNOG] Single Switch Full 48-Port PoE Support

[Tim March]

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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