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Can Power over Ethernet (PoE) be passed over non-PoE switches ?

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Generally, no. PoE doesn't carry through additional switches/hubs, it will only be supplied to devices that are directly connected to a PoE switch (and only by request).

If you have a PoE switch, and want to pass PoE to cliend devices, you should not use non-PoE switches in between. There are a couple of possible issues if you do:

1. Most PoE switches will not turn on power to ports that are connected to non-PoE client devices at all.

2. Some older non-PoE switches not only fail to pass power, but they may make matters worse by shorting unused pairs 1 and 4 (connecting them to ground)!


Note: If only a few devices require PoE, instead of changing all switches to PoE, it is sometimes more cost effective to use PoE injectors on the ports that need PoE.



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