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Sunday, March 12, 2017

Is Power over Ethernet cable the next big thing?

New CREE light fixtures (not just bulbs, fixtures) use power from ethernet cables. They can also be controlled by the computer over the network. It looks like a special router just for these lights is needed.

There are several levels of PoE:
  1. PoE (IEEE 802.3af) provides up to 13 W (37 to 57 V, max 350 mA).
  2. PoE+ (802.3at) bumps it up to 25 W (42 to 57 V, max 600 mA), but requires Cat5 cabling or better. (If each LED draws 3.3vdc then PoE+ port can support up to 7 of those LEDs. The volts drawn by each LED seems to be the limiting factor, not the amps.)
  3. UPoE: 60vdc limit but at how many amps?


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