[asterisk-users] Quiet 24 port POE gig switch

[Bernd Felsche]

Ian Cowley <ianc at moffat.co.uk> wrote:

>Beware PoE switches that can't handle Class 3 (15W) on all ports.
>Most have fans because 24 (or 48) x 15W is hot!

That's the power supplied .. which'd be at the far end of the wire.

The efficiency of the PSU plays a big part in the heat dissipation.
The push to compact dimensions doesn't help ... a 400W or
thereabouts PSU with 24 independent outputs in 1U height? I suppose
if the switch were quite deep it could be workable and quiet.

The problem isn't simply of being "fanless". But being quiet.
Preferably below 32 dBA at 1 metres for most offices.

You can do that by using fans other than the tiny, whiney, 40mm fans
that vibrate at 6000 to 18,000 Hz. A couple of 80 or 120 mm muffin
fans at the back or front, pushing air in (hence the deep
dimensions), but the top and bottom would need recesses to allow
sufficient airflow when the positions above and below are filled.
-- 
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