[asterisk-users] Quiet 24 port POE gig switch

[Bernd Felsche]

Singer XJ Wang <wang at pythian.com> wrote:

>Honestly, how are you guys expecting a 24 Port POE to be fanless?

>Lets start with some logical points here:

>1) 24 Ports x 15.4W/Port = 369.4Watts + Switch Power = ~400Watts... now 
>Power Supply isn't that efficient so you're getting probably a 500Watt 
>Power Supply (assuming 80%)...

It'd still be a 400W PSU if it supplies 400W.

>2) with a 1U chassis, you can't blow air up or down... only front and 
>back.. so you're stuck with a 40mm fan..

And the sides...

... you can fit a muffin fan horizontally as suggested and allow it
to draw in or to blow air at the top or botton within the height of
the 1U.  Muffin fans are 25 to 35 mm "high".

Placed "centrally", the fans can draw in air from around the port
connectors on the front panel (if the back-end of the connectors is
sealed!) and blow into the PSU, exiting at the back. This also helps
to reduce the little fan noise that remains, leaving mostly white
noise from the air flow itself (unless you install whistles).
-- 
/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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