Power over Ethernet Switch - PoE 交换机

For some NVR / IP camera setups, it may be necessary to use an external Power over Ethernet (PoE) Switch to expand your system to the maximum number of cameras. In other cases a PoE switch can help simplify or extend the wiring for your installation.
对于某些 NVR / IP 摄像机设置，可能需要使用外部 Power over Ethernet (PoE) 交换机将系统扩展到最大数量的摄像机。在其他情况下，PoE 交换机可以帮助简化或扩展安装的接线。

A Power over Ethernet (PoE) switch is a dedicated device that contains multiple Ethernet ports to provide power and network communications to IP cameras. This allows a PoE switch to expand the reach of an NVR system because you can connect IP cameras to the PoE switch rather than the NVR.
Power over Ethernet (PoE) 交换机是一种专用设备，包含多个以太网端口，可为 IP 摄像机提供电源和网络通信。这使得 PoE 交换机可以扩展 NVR 系统的范围，因为您可以将 IP 摄像机连接到 PoE 交换机而不是 NVR。

A PoE switch expands a network created by a router. Therefore, it must be connected directly to a router on the same network as your NVR.
PoE 交换机扩展了路由器创建的网络。因此，它必须直接连接到与 NVR 在同一网络上的路由器。

High-powered IP devices such as PTZ cameras use PoE+ (also known as PoE class 4 or IEEE 802.3at), which provides more power to connected devices than standard PoE. Compatible NVRs use integrated PoE+ ports to provide power and PTZ commands to the camera, as well as video connection to the NVR.
诸如 PTZ cameras 之类的高功率 IP 设备使用 PoE+ (也称为 PoE class 4 or IEEE 802.3at)，与标准 PoE 相比，它为连接设备提供更多电源。兼容的 NVR 使用集成的 PoE + 端口为摄像机提供电源和 PTZ 命令，以及与 NVR 的视频连接。

PoE+ ports will provide up to 30W to each connected device, whereas standard PoE (class 3) ports only provide up to 15W.
PoE + 端口将为每个连接的设备提供高达 30W 的功率，而标准 PoE (class 3) 端口仅提供高达 15W 的功率。

The 8 refers to the number of PoE ports supported by the PoE switch. These ports are for the cameras, and provide both power and data transmission. The +1 refers to an additional port to connect the PoE switch to your router. It only supports data transmission.
8 表示 PoE 交换机支持的 PoE 端口数。这些端口用于摄像机，并提供电源和数据传输。+1 表示将 PoE 交换机连接到路由器的附加端口。它只支持数据传输。

The steps to connect your system using a PoE switch are as follows:

Connect an Ethernet cable from the LAN port on the PoE switch to your router. Connect the power cable to the PoE switch and to a power outlet or surge protector.
Connect IP cameras to ports 1~8 on the PoE switch using the Ethernet extension cables. The PoE switch will provide power and video transmission the same way your NVR does.
You must add the cameras to your NVR to view the cameras and enable recording. To do this, follow the steps in your NVR’s instruction manual. Or, click here for details for LNR300 Series.

使用 PoE 交换机连接系统的步骤如下：

将以太网电缆从 PoE 交换机上的 LAN 端口连接到路由器。将电源线连接到 PoE 交换机和电源插座或电涌保护器。
使用以太网延长线将 IP 摄像机连接到 PoE 交换机上的端口 1~8。PoE 交换机将以与 NVR 相同的方式提供电源和视频传输。
您必须将摄像机添加到 NVR 才能查看摄像机并启用录制。为此，请按照 NVR 说明手册中的步骤操作。

You can connect the PoE switch to your router using a Cat5E or Cat6 Ethernet cable up to 300ft (92m) in length, and you can connect the IP cameras up to 300ft (92m) from the PoE switch.
您可以使用长达 300 英尺 (92 米) 的 Cat5E 或 Cat6 以太网电缆将 PoE 交换机连接到路由器，并且可以从 PoE 交换机连接最长 300 英尺 (92 米) 的 IP 摄像机。

This allows you to simplify the cabling for your installation. Because you can run cameras to either the NVR or the PoE switch, you can place the NVR and PoE switch in different parts of the building that are closer to the actual IP cameras.
这使您可以简化安装的布线。由于您可以将摄像机运行到 NVR 或 PoE 交换机，因此您可以将 NVR 和 PoE 交换机放置在建筑物的更靠近实际 IP 摄像机的不同部分。

References

https://yongqiang.blog.csdn.net/