Bests & Worsts Reviews from Amazon

This switch has two big flaws - a PoE switch should have no power when a non-PoE device is connected, and the output voltage is low. With no load - the BV switch has +47v on pins 4,5 of each socket, +25 volts on pins 7,8 and also pins 1,2 of socket 1. You can measure it with a volt meter to earth ground. This means if you connect it to a laptop or printer on those ports - the Ethernet jack will be at +47v - which isn't right. There should be no power until a compatible device is connected. Besides that - and they don't tell you - this is a mode B PoE device ( 4,5+ and 7,8-) ports 2-4 are 802.3af mode B. Port 1 is 802.3af mode A and mode B. the ports shut down at 850 mA load - which is about 40 watts - too high - the 802.3at spec is a current limit at 650 mA. Port 1 has PoE on all 4 pairs - so it will never shut down properly before the power supply limit is reached. In fact - you cannot use this switch in 802.3at mode at 100 meters because the power supply is only 48v. You need a 56v power supply to be able to reach 100 meters at 25 watts. If you try 802.3af ( 13 watts) at 250 meters / 10 mb - it will also fail because of the loss in the cat-5e. This is physics, people - at 250 meters and 13 watts - only 41 volts is delivered remotely - the spec is 44 volts. Throw away the supply they ship. Google poe-calculator to see the power loss in CAT-5e cables A good power supply is here: WS-PS-56v60w 56 volt 60 watt power supply for PoE injectors with 1.1 amps, 2.1mm connector and UL and FCC approvals