PoE question

J.Luszczek

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?

Dan Lynch

Each port of PoE is supposed to be 15.4W max. So that switch is designed to power 4 PoE devices.

Dan

J.Luszczek

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.Luszczek

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.