POE（Power over Ethernet）是一种利用网线给设备提供直流电的技术。由于利用网线给POE设备供电时，网线很容易发热，处理不当，甚至会给设备和网线造成损害。
选择POE网线时需要注意什么？
1.网线线径尺寸和电阻：通常线径越大，电阻越小，产生的热量就会越小，越适合为高功率POE供电。
2.网线内部构造：具有金属箔屏的屏蔽网线会比非屏蔽网线的散热性能好。
3.网线温度额度：网线额定值越高，网线内的功率损耗越大，不仅会降低电气性能，还会影响网线的物理性能和寿命。
4.布线方式：如果网线扎成一捆放在空气不流动的地方，容易提高网站的导热性。
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What should I pay attention to when choosing a POE network cable?
Network cable diameter and resistance: Generally, the larger the diameter and the smaller the resistance, the smaller the heat generated, and the more suitable for high-power POE power supply.
The internal structure of the network cable: a shielded network cable with a metal foil screen will have better heat dissipation performance than an unshielded network cable.
Network cable temperature limit: The higher the network cable rating, the greater the power loss in the network cable, which will not only reduce the electrical performance, but also affect the physical performance and life of the network cable.
Wiring method: If the network cable is tied into a bundle and placed in a place where the air does not flow, it is easy to improve the thermal conductivity of the site.
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