Common equipment for network monitoring

Network camera, hard disk video recorder NVR (or ordinary PC plus client, which is suitable for ordinary users with desktop computers), switch (it needs to be adjusted according to the number of cameras and code rate, and can be recommended by the supplier), hard disk, display, network cable, power jacket cable, power adapter (or 12V DC switching power supply), camera bracket Network cable crystal first class.

Camera installation mode

When the front-end camera is powered on and running normally, the captured video signal is transmitted to the hard disk video recorder in the background through the network cable and switch for preview and storage. According to the different points of the monitoring system, the specific connection methods are different. See Step 3 below for the specific connection diagram.

Step 1: determine the installation position and monitoring area of the camera, and fix the camera to the building or monitoring pole through the camera support.

Step 2: determine the placement position of the background equipment (hard disk video recorder and display), install and place the hard disk video recorder, and prepare the power plug-in for the background equipment.

Step 3: after the front and rear ends are completed, wiring is required (if planning or scheme is made in the early stage, this step is actually a priority, especially in the environment ready for decoration, the pipeline needs to be embedded). The line is divided into two parts: first, confirm the location of the switch, connect each camera to the switch through the network cable, and connect the network hard disk video recorder (NVR) connect with the switch, route the line in the principle of convenience, beauty and safety, and make crystal heads at both ends of each network cable;

Secondly, for the wiring of camera power supply line, each camera needs a 12V / 1A or 2A power adapter. Depending on the construction environment or cost requirements, it can be replaced by switching power supply (it is recommended that a 12V / 10A switching power supply should not carry more than 10 cameras, and so on). It needs to be equipped with another power plug. As shown in the figure:

  

If the camera is powered by Poe, only one network cable needs to be laid, and a Poe switch supplies power to the camera. As shown in the figure:

  

In addition, the connection mode adopted is also different according to the number of points of the monitoring system.

Architecture I: small projects with 1-8 points

  

For small projects with 1-8 points, ordinary 100m switches can be directly used to build the network environment. If 2 million pixel IPC is adopted and the code stream is calculated at 6Mbps, the bandwidth occupied by 8 cameras is 8 * 6 = 48m, while the actual utilization rate of 100m switch is 50% – 70%, that is, 50-70m, which can fully meet the transmission requirements of 8 IPC.

Framework 2: small and medium-sized projects with 9-50 points

  

For small and medium-sized projects with 9-50 points, it is not enough to only use 100m switches. A layer-2 full Gigabit switch with higher performance is required as aggregation to ensure the smooth transmission of video information.

Framework 3: medium and large projects with more than 50 points

For medium and large-scale projects with more than 50 points, a three-tier network architecture needs to be adopted: access layer, aggregation layer and core layer.

Step 4: debug the camera. After the installation is completed and all lines are connected, power up the camera. It is necessary to make relevant network settings on the network hard disk video recorder (NVR) and add and distribute the network camera (the configuration methods of different manufacturers are different). In this way, after adding all cameras, you will see the image, and you can adjust the angle of the camera The focusing lens can be adjusted to the appropriate effect.

When the number of front-end cameras is small, you can directly add cameras to the hard disk video recorder and let the cameras automatically assign IP addresses.

When there are a large number of cameras, you must first fill in the camera address, and then install and debug. When adding cameras, it is recommended to add them directly on the web page, not directly on the hard disk video recorder.

matters needing attention

The relevant settings of network hard disk video recorder, video recording, image color, etc. need to be set manually, which can be operated according to the instructions of the purchased equipment. Such a network monitoring system is completed

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