POE是透過網線進行供電的數據傳輸技術，只要一條網線就可以接入POE攝像機點位，無需額外的電源佈線。
選擇POE交換機時要考慮什麼?
單端口功率：根據IPC的大功率選擇交換機的規格。
整機大供電功率：交換機的大輸出供電功率需大於所有IPC的功率之和。
供電類型：如果使用八芯網線不需要考慮：如果是四芯網線就要確認交換機是否支持A類供電。
* 選擇時也要結合各類POE的優勢和成本考慮。
遠距離點位的監控中，經常會用到光纖收發器和光纖交換機。光纖交換機、光纖收發器以及光模塊是可以相互搭配使用，選擇時需配對使用，務必保證A-B端匹配。
後還需參考端口速率、光纖類型和雙纖或單纖等。
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Single port power: Select the specifications of the switch according to the maximum power of the IPC.
Maximum power supply of the entire machine: The maximum output power of the switch must be greater than the sum of the power of all IPCs.
Power supply type: If you use an eight-core network cable, you don't need to consider: if it is a four-core network cable, you need to confirm whether the switch supports Class A power supply.
* When choosing, you must also consider the advantages and costs of various POEs.
In the monitoring of long-distance points, fiber optic transceivers and fiber switches are often used. Fiber switches, fiber transceivers, and optical modules can be used with each other. When selecting them, they must be used in pairs. Be sure to match the A-B ends.
Finally, you need to refer to port speed, fiber type, and dual or single fiber.
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For more information about 'What to consider when choosing a POE switch?'，please visit : http://livservices.com.hk
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