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What power adapter would I need to send PoE at 200 ft?

Tags:
  • Linksys
  • Power Adapter
  • Ethernet Card
  • Cable
  • Networking
Last response: in Networking
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December 17, 2013 2:55:37 PM

I have a linksys wrt54g v3 that is 12V 1A and I need to have it in my backyard as a client bridge. Right now I have a long ass extention cable running to it but would like to eliminate that completely. I bought a PoE injector and separator, however when I have it connected to the 200 ethernet cable it does not power the router. When I use a shorter ethernet cable everything works perfect. I believe the voltage is decreasing over the long range. Around how many volts, amps, and watts should the output be to power my router with a 200 foot ethernet cable?

More about : power adapter send poe 200

December 18, 2013 5:32:01 AM

You will likely need a voltage meter to figure it out without guessing. You would measure the voltage at the far end with it plugged into the router. The voltage will always be higher when there is not a load on it. If for example you get 9 volts on the far end you could increase the power to 15volts and hope to get 12volts Be vary careful devices generally tolerate less voltage but if you go to high you will fry them.

At some point you will exceed the capacity of 1 pair of wires and have to go to PoE units that use all 4 pair. Not sure if they make units like that. These are very proprietary things.

Most time PoE means 802.3af or 802.3at which is a actual standard and uses 48volts and can go 100m. Life is much easier when you deal with equipment that actually follows a standard.
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