Q2: when my PD works with the PoE switch, the indictor LED light flickers at times (gets on, but dies quickly and for a while it goes to the loop), why?Ī: The LED light gets on, it means that the PD can be powered, but for some reasons, the PSE stops the process. This information is also necessary when you contact us for support. So if the PoE LED does not lit up on the switch after you plug you PD into the PoE port and your PD can’t be powered on, it is recommended to contact your PD’s vendor and ask for the PD’s power supply mode and the polarities it supports after eliminating the basic network factors. Howerver, you can use a crossover cable to avoid the problem. 2) The PD support Alternative A, and the line pair 1/2 is passive pole and the line pair 3/6 is positive pole, as introduced in last chapter, the PD cannot work either based on using the straight through cable normally.So the PD and PSE cannot cooperate together. But as mentioned above, TP-Link’s PoE switches are based on Alternative A. Confirm the power supply mode with the PD’s vendor, there may be two situation that cause the problem:.For some switches, not all of the RJ-45 ports are PoE ports, you can refer to the UG for more information.And the length of the Ethernet cable cannot be over 100m. Ensure that you have chosen the right and qualified Cat.5 or above Ethernet cable and plug into the right port on the PD.Make sure the PD is a standard device based on IEEE802.3af/at protocol.Q1: Why my PD fails to work when connected to the PoE switch and the LED light on the switch isn’t on? At present, all of TP-Link’s PoE switches are standard PSE and designed based on the Alternative A and the line pair 1/2 is passive pole while the line pair 3/6 is the positive pole.According to IEEE 802.3af/at protocol, the standard PSEs can just support either.Alternative A or B, while the standard PDs must support both modes and be compatible with all kinds of the polarities.In the picture above, the line pairs 4/5 and 7/8 are free lines and the 4/5 pair is positive pole while the 7/8 pairs is the negative pole. In the picture above, you can see that the PSE supplies power using date line pairs 1/2 and 3/6, and polarity of the line pairs can be positive or negative, which is decided by the designation of chip vendors. Alternative B: Supply power using the spare line pairs 4/5 and 7/8 of the Ethernet cable.Alternative A: Supply power using the date line pairs 1/2 and 3/6 of the Ethernet cable. There are two power supply mode based on IEEE802.3af/at standard.
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