1) cheap solutions where just passively the supply voltage is looped, which in my opinion a high Risikio represents: one closes accidentally a network device without the appropriate passive adapter to the network device probably a case for the garbage can. Furthermore, only 2 of the 4 Adaernpaare are the passive adapter solutions only 100Mbit possible as for data transmission then available
2.) expensive 802.11af-compliant adapters. Here fall above drawbacks away, but unfortunately, these "active adapter" come at a price: all that I've seen costs 80 euros or more - ie twice as much as I paid for the whole access point.
Fortunately, I got the TP-Link TL-POE10R here at Amazon discovered: 802.11af compliant and with a price of less than 20 Euro really inexpensive! Have combining Extreme Networks PoE switch -> 20m Cat5 cable -> TP-Link TL-POE10R -> TP-Link TL-WR 1043 can now find for 3 weeks in operation and no Abstürtze or failures. Kudos to TP-Link! Also still positive mentions on the PoE adapter various output voltages (5 V or 9 V or 12 V) can be set is. Furthermore, a power cable is supplied with which one produces the voltage supply between PoE adapter and network device. The original power supply of Acesspoint is therefore no longer required.
Conclusion after 3 weeks: strong buy recommendation!