When buying a PoE product, many ask how far it can be transmitted? Feng Runda today answered this question for you, and only for PoE devices that meet the IEEE802.3af/at standard, non-standard ones do not consider. Because of the existence of the IEEE organization, most of the network products conform to the IEEE standards.

First, the effect of network cable on the power supply distance The equivalent impedance of Category 5 network cable, which is generally 100 meters, must be less than 12.5Î©, and IEEE802.3af needs to be less than 20Î©.

The PoE power supply distance is closely related to the network cable. The lower the impedance of the network cable is, the farther the transmission distance is. The distance between the PoE power supply and the network cable is a joke! To supply power far enough, the network cable must first buy authentic products.

Second, the IEEE802.3af/at standard requires a PoE power supply voltage. The PoE output voltage range is 44-57V, and the PD power supply voltage range is 36-57V.

2, PoE power supply distance requirements are far, the output voltage must be high.

In short, if the PoE power supply is far away, the cable must meet the standards and the output voltage of the PoE-powered product should be as high as possible within the 44-57V standard.

For example: Fengrun Da PoE switch adopts the output voltage of 48V or 52V, whether it is af standard or at standard, is enough bolt or wireless AP is working properly.

Of course, a healthy network should not only look at the PoE power supply distance that is long enough, but the transmission quality of the network cable must be guaranteed. According to IEEE regulations, transmission over 100 meters does not guarantee transmission quality, but in some cases, such as security cameras, it may exceed 10 meters. Here, Feng Runda teaches you a small trick: It is not too much. The camera's connection rate is manually set to 10M. For a 2 million-pixel camera, the 10M rate is sufficient and a very large chance of solving the problem.

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