Using a D-link PoE injector with HP Procurve AP?

Posted on 2012-04-02
Medium Priority
Last Modified: 2012-04-02
I recently purchased a HP MSM410 Access Point. There is no separate power inlet, it uses PoE exclusively. The PoE injector isn't included and has to be purchased separately. Now, I have three D-link AP's that run with D-Link's PoE injectors. Can I use one of them without "frying" the HP device? The PoE injectors says 48V and 0.4 Amp. The HP device says 48V and 0.15 Amps. I guess there is a handshaking process that will eliminate any risk of to many amps being delivered, right? Or is it that the HP device only will request 0.15 Amps of the 0.4 available, is it compatible?
Question by:widen76
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Accepted Solution

Darr247 earned 2000 total points
ID: 37796814
They are compatible.
You can't push more amps into something... amps are drawn by the component using power.

The labels basically say the HP device will draw a maximum of 0.15A (7.2W), and the D-Link PoE injector can supply up to 0.4A (19.2W at the standard PoE voltage of 48V).

Author Comment

ID: 37796854
Thanks so much Darr247! I searched online for an answer but couldn't get a straight answer. Thankfully Experts Exchange and you guys comes to the rescue!
Thank you, I'll do a test tomorrow.
LVL 44

Expert Comment

ID: 37796877
How much the injector will actually add to your power bill depends on what type of supply it is. If it has a heavy transformer-type supply, then it will likely draw about 19 or 20W all the time it's plugged in; if it's the lighter switching-type power supply, without a transformer, then it should use only about 7.3W (or less, if the PoE device is drawing less than its label rating).

Author Comment

ID: 37796988
Thank you. I'm not sure if it's a switching supply or not. When it comes to power, a small footprint is always preferable. It's probably negligible  to our Dell blade server rack in the server room though... =)

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