Singer XJ Wang <w...@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 \ / ASCII ribbon campaign | Religion is regarded by the common people X against HTML mail | as true, by the wise as false, and by the / \ and postings | rulers as useful. -- Seneca the Younger _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
