Work experience-twisted pair troubleshooting

The wireless AP uses POE switch power supply, fault performance is unable to access the Internet via the AP, the corresponding Ethernet port on the POE switch after the restart of the yellow light flashes a few seconds after the flashing, the green lights are not lit; At first thought is the AP fault, after the fault has not been ruled out, the network cable unplugged after plugging in a common switch, the other end connected to the notebook computer, found no network connection, the determination of twisted pair of physical problems, after careful examination found the first, the 22 line position is not correct, re-do the crystal head after troubleshooting, the network back to normal

Note: Poe Power supply Mode:

Mode A (idle line 45,78 power supply): 45 (blue, blue white) for +,78 (Brown White, brown) for-

Mode B (Data cable 12,36 power supply): 36 (green White, green) for +,12 (Orange White, orange) for-

The IEEE802.3AF standard defines the supply voltage is the DC 44~57V,IEEE802.3AT standard defined by the supply voltage is DC 50~57v, but in general will use 1236 (orange white, orange, green white, green) transmission data, 45 (blue, blue and white) power supply positive, 78 (brown white, Brown) power supply negative.

Work experience-twisted pair troubleshooting