Shulou(Shulou.com)06/01 Report--

The line sequence problem of PoE switch or PoE power supply is generally contacted by homemade PoE. If you directly choose and purchase PoE switch, such as Cisco, Huasan, and Fengrun Da, you don't have to consider the line sequence problem, just plug in the power supply. Because the PoE power supply is realized through the network cable, the wire sequence here is also the problem of the twisted pair cable.

If you make your own PoE, you can watch it on the Internet.

The crystal head is made by using 8-core all-copper mesh wire in the order of 568B: 1 white orange, 2 orange, 3 white green, 4 blue, 5 white blue, 6 green, 7 white brown, 8 brown, of which lines 1, 2, 3 and 6 are data lines and 4, 5, 7 and 8 are PoE power lines! Electric soldering iron welding is used to reduce attenuation. On the market, the No. 4, 5, 7 and 8 core wires of many garbage network wires are copper-clad iron or copper-clad aluminum core (only copper core wire can be welded with electric iron). The power supply of garbage network wire attenuates greatly and can not supply power normally!

Remember that the dc head is positive on the inside and negative on the outside. We must pay attention to this in the stage. Pull out (blue) between the two ends of the wire. Blue and white) connected to the power supply + pole (brown. Brown and white) connected to the power supply-pole, one end of the cable (white orange, orange) (white and green. Green) pick up the signal, crystal head arrangement 1 white orange, 2 orange, 3 white green, 4 empty, 5 empty, 6 green, 7 empty, 8 empty.

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