Security wireless monitoring system consists of several major components

The installation of a wireless monitoring system is a wireless video transmission application, from the front-end camera to the back-end image display and recording constitute an independent and complete system. It can reflect the monitored situation in real time, image, and reality, and can also be used for monitoring for a long time in a harsh environment instead of manual and recorded by a video recorder. The introduction of the installation of wireless monitoring system can achieve on-site monitoring, risk warning, video recording, event tracing and other functions.

Security wireless monitoring system consists of seven major elements

First, the front-end part

The front end completes the shooting of network digital video, the generation of detector alarm signals, the control of the pan/tilt, the protective cover, and the alarm output.

Second, the transmission part

The transmission part consists of wireless monitoring equipment. The transmission part consists of a wireless transmitter, a wireless receiver, an antenna, a power supply, a fixing clip, and the like. There are two types of wireless transmission devices: one is an analog microwave transmission device, and the other is a digital microwave transmission device. But now most of it is made of wireless digital microwaves.

Analog microwave transmission

Analog microwave transmission is to directly modulate the video signal on the microwave channel (microwave transmitter, VS-1606) and transmit it through the antenna. The monitoring center receives the microwave signal through the antenna and then demodulates the original video signal through the microwave receiver. . Can also control the PTZ lens, equipment, built-in instruction equipment, this monitoring method is very clear image, no delay, no compression loss, low cost, simple construction and debugging, suitable for general monitoring point is not many, need relay is not much Use in case.

2. Digital microwave transmission

Digital microwave transmission is to first compress the video coding, then modulate by digital microwave (VS-5854) channel, then transmit it through the antenna, the receiver is the opposite, the antenna receives the signal, microwave despread, video decompression, and finally restore the simulated video. Signal, microwave despreading can also be installed through the computer after the corresponding decoding software, computer software decompression video, and the computer also supports video, playback, management, cloud mirror control, alarm control and other functions; this monitoring method image has 720*576 And 352 * 288 resolution selection, the former higher cost, the video has a delay of about 0.2-0.8 seconds, the cost varies greatly depending on the actual situation, but there are also some analog microwave advantages, such as more monitoring points, the environment Complex, need to add more relay, more concentrated monitoring point it can focus on transmission of multi-channel video, anti-jamming capability is better than the simulation, etc.... advantages, suitable for more monitoring points, need to relay more Use in case of

3, wireless network video server

The network video server is designed to use computer networks for image surveillance and is designed with a variety of integrated solutions to transmit real-time video surveillance images over 10/100 Base-T networks, supporting ISDN, PSTN, or XDSL routers over LANs or the Internet. Simply spread. Video MPEG4 compression, audio G.729A compression; achieve RS485 PTZ camera control; standard RS232 serial interface; audio and video synchronization input / output; system lock, password verification, user authorization, MAC code verification and other security features.

Third, the control part:

This part is the core of the security monitoring system. It completes digital acquisition of video surveillance signals, MPEG-1 compression, monitoring data recording and retrieval, and hard disk recording. The VS-300T transmitter is used at the center point to transmit the control commands issued by the control keyboard; the VS-300R wireless command receiver is used to receive control commands at the control site, and then the output commands are sent to multiple decoders via the RS485 bus and then passed through. Decoder to control the PTZ, lens, dust cover or boot, shutdown, etc., very flexible.

A command transmitter can control 256 command receivers.

Fourth, TV wall display part:

This part completes the real-time monitoring signal display and playback and retrieval of video content on the system monitor or monitor screen. The system supports multi-screen playback, simultaneous recording of all channels, system alarm screen, and voice prompts.

Fifth, anti-theft alarm part:

The alarm defense system uses active infrared motion detectors to control important channels and connect them to the alarm center of the management center. When personnel enters from abnormal entrances during non-working hours, the detector will send alarm signals to management immediately. At the same time, the center initiates linkage devices and equipment to warn intruders and can perform continuous video and video recording.

Sixth, power supply system:

The supply of power supply plays a vital role in ensuring the normal operation of the entire monitoring and alarm system. Once the power supply is damaged, the entire system will be paralyzed.

Seventh, back-end equipment

The development of back-end equipment is now split into two directions: one is the centralized storage direction; the other is the distributed storage direction, and the main device is the NVR.

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