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PoE question

J.LuszczekJ.Luszczek Posts: 159
in London Architect with Soundweb London
What is the power draw of Blu-10 and Blu-8 when using PoE?
The installation guide says 0.3A at 12V- but that's from a 12V power supply. It works out to under 4W. Is PoE draw similar or are we dealing with internal DC-DC converter losses?
Basically the question is, if a PoE switch is rated at 62W how many Blu wall devices can it safely power?

Comments

  • Dan LynchDan Lynch Posts: 472
    Each port of PoE is supposed to be 15.4W max. So that switch is designed to power 4 PoE devices.

    Dan
  • J.LuszczekJ.Luszczek Posts: 159
    So do Blu-8 and Blu-10 use all of the alowed 15.4W?
    The switch I'm looking at is a 10 port job with PoE available on all ports simultaniously.


    PoE power can be enabled or disabled per unit and per port; power can also be limited per port.


    http://www.3com.com/other/pdfs/products/en_US/3com_401049.pdf
  • J.LuszczekJ.Luszczek Posts: 159
    OK, I have an answer to my question. I thought others might like to know the answer.
    The 3-COM switch has a power draw function in its admin tools.
    Each Blu-10 draws just over 3W. The reading varied from 3.1W to 3.4W depending on the length of wire used.
    EDIT: Blu-8 draws only 1.7 W with about 30 ft of wire in line.
    So, one 10-port POE switch rated at 60W can safely power Blu remotes on all of its ports.
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