Questions about Power over Ethernet (PoE) - Canadian TV, Computing and Home Theatre Forums
 
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post #1 of 3 (permalink) Old 2015-01-14, 04:33 PM Thread Starter
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Questions about Power over Ethernet (PoE)

I just bought three Ubiquiti Wireless Access Points to use in my house. These get their power from PoE. They came with PoE injectors/adaptors, but you can also use a PoE switch. I have never used PoE so I have a few questions.

Can you put a regular non-PoE switch downstream from a PoE switch? If you do this will it pass on the power it recieves from the upstream switch to downstream devices? Or do you lose the power once it hits a non-PoE device? Even if it doesn't pass on the power is it detrimental to do this?

Anything else to keep in mind when using PoE?
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post #2 of 3 (permalink) Old 2015-01-14, 04:53 PM
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Hi Wayne,

Quote:
Originally Posted by Wayne
Can you put a regular non-PoE switch downstream from a PoE switch?
Yes, but you won't get the "P" over Ethernet. So, your answer is no. It's up to the device to request the power, and it needs to be directly attached to the PoE port on the PoE switch (many PoE switches only have so many PoE ports). Presumably the PoE injector would follow the same rules and only send the power if/when it's requested by the device.

Power, unlike packets, is never "routed" to other network devices.

Quote:
Originally Posted by Wayne
Even if it doesn't pass on the power is it detrimental to do this?
No. You won't break anything.

Cheers.
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post #3 of 3 (permalink) Old 2015-01-15, 10:55 PM Thread Starter
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Thanks - I was pretty sure that power wouldn't be routed, but I thought that there was a chance that it could be "passed through" a non-PoE switch.
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