Network monitoring system composition

The five major systems of security system are video surveillance system, intrusion alarm system, intercom system, entrance and exit management system and perimeter alarm system. Video surveillance system is the most important of them. All kinds of entrances and exits and visual monitoring of channels depend on Video surveillance system.

 

　　 So how is the monitoring system composed and what is the architecture?

Generally consists of the following parts:

 

1. Front-end camera: The gun needs to be used with the lens. If the outdoor camera needs to add a lightning protection device, it is necessary to consider the signal and power supply lightning protection.

 

2. Transmission cable: including network cable and power cable. For example, POE power supply can directly use twisted pair cable, but the transmission distance should be controlled within 75 meters.

 

3, switch: all cameras need to be controlled within 90 meters, can be directly connected to the switch, if greater than 90 meters, you can use the network jumper + optical transceiver + optical cable to access the switch, according to the number of front-end cameras Select the switch with the corresponding number of ports. Generally, the switch upload bandwidth needs to be 45% redundant. The 100 Mbps upload calculates the switch that can access several 2M/4M/8M code streams according to the code stream. In the case of 8M code stream, the maximum connection is possible. Into 7.5 cameras, now the switch upload port generally has Gigabit power / optical port, according to 45% redundancy, you can access more cameras.

 

Cascading port bandwidth: IPCAM code stream * number = minimum bandwidth of the upload port. Generally, when the IPCAM bandwidth exceeds 60 Mbps, it is recommended to use a 1000M cascade port. For example, the bandwidth required by a camera with more than 8 8M streams is 8M*8=64Mbps, it is recommended to use Gigabit interface.

 

4, optical transmission accessories: including optical modules, optical cables, optical jumpers, pigtails, corresponding interface couplers (such as SC-LC, LC-LC, etc.), optical distribution frames or wiring boxes.

 

5. Core switch: Select the appropriate switch according to the access switch of the front end and the total bandwidth of the camera data exchange. The calculation method of the packet forwarding rate and backplane bandwidth of the switch is given below.

 

Packet forwarding rate: The packet forwarding rate of a 100M port is 0.1488Mpps/s, and so on is the packet forwarding rate of Gigabit or 10Gbit. The packet forwarding rate of a camera is about 2.6Kbps, which fully meets the requirements.

 

Backplane bandwidth=port number*port speed*2, such as 24-port 100M core switch (including two gigabit ports) bandwidth is (24*100*2+2*1000*2)/1000=8.8Gbps/S.

 

Packet exchange rate: Port number* Port speed/1000*1.488Mpps=Packet exchange rate, such as 24-port 100M core switch packet exchange rate is 24*100/1000*1.488=3.60Mpps/S, sometimes the packet exchange rate of some switches If it is calculated that this requirement cannot be met, then it is a non-wire-speed switch. When a large amount of throughput is performed, it is easy to cause delay.

 

6. Storage device: It is divided into hard disk recorder and centralized storage device, and select the appropriate device according to the number of camera channels.

 

7. Decoder: Select the decoder corresponding to the number of channels according to the number of channels of the display

 

8, the number of monitors:

The specific quantity is subject to local technical defense regulations.

 

9, other integrated equipment and software: such as security integrated management platform and software, streaming media forwarding server and so on.

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