1st one should never connect ac line current to a POE device , this im sure will damage most of whats connected to network , now there are some network hubs that allow for POE pass thru but draw there own operating power from a wall outlet plug , there are also some that use the wall outlet plug to Power the POE , this is most times from a router or smart switch , and each output jack is software selectable if you would like to have POE on that port (or not) this allows you to connect non Poe devices to a smart switch or router and no damage will occur to that device (cus power is off to that port )
Poe is a different type of power(DC) than whats avail from your wall outlet(AC) , and a large difference in size as well , that is why these two should never be connected together ! But a neet advantage is that POe devices need different amounts of power and the smart sw or smart router will only give that device the amount of power it needs (its smart after all !!) and if it detects a fault (short ) it cuts that port off as well to keep rest of network going !! smart devises that is only .
When using Huawei power supply units, Huawei fixed switches supports 110 V AC input power. The power consumption of most powered devices (PDs) is 4 W to 5 W; therefore, 250 W and 500 W power supply units can provide sufficient PoE power for PDs.
NOTE:
All fixed PoE switches except the S2700-9TP-PWR-EI, S2750-20TP-PWR-EI-AC, S2750-28TP-PWR-EI-AC, S2751-28TP-PWR-EI-AC, S5700-10P-PWR-LI-AC, S5700-28P-PWR-LI-AC, S5700-28TP-PWR-LI-AC, S5700S-28P-PWR-LI-AC, S5701-28TP-PWR-LI-AC, S5700-52P-PWR-LI-AC, S5700-28X-PWR-LI-AC, and S5700-52X-PWR-LI-AC support double PoE power supply units.
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