Mailinglist Archive: opensuse (1777 mails)

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Re: [opensuse] Moving to IPv6
  • From: James Knott <james.knott@xxxxxxxxxx>
  • Date: Tue, 14 Sep 2010 11:59:53 -0400
  • Message-id: <4C8F9BF9.6050202@xxxxxxxxxx>
Anton Aylward wrote:
It used to that each rack had a PSU (for some stupid reason they always
seemed to be at the bottom) that delivered DC (+/-12V, ±5V) on busbars
to items in the racks.
That "stupid reason" would be weight. Power supplies have, until recently, been very heavy. Putting them at the top would make the cabinets top heavy. Placing the P.S. at the bottom also keeps AC power away from the equipment. When you run AC power in a cabinet, you have to be a lot more careful than you would with signal or DC power cables.

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