Several major elements of security monitoring system

The installation monitoring system is a comprehensive video surveillance solution that operates as an independent and fully integrated system, from the camera to image display and recording. It enables real-time, vivid, and accurate representation of monitored objects, making it ideal for long-term use in harsh environments, replacing manual monitoring and traditional video recorders. This system supports on-site monitoring, risk alerts, video recording, and event tracking, offering a reliable and efficient security solution. **Seven components of the security monitoring system**, with the **remote end** responsible for capturing analog video signals, generating alarm signals, controlling PTZ cameras, managing the shield, and outputting alarms. **Second, the transmission section** consists mainly of wireless transmission devices. The transmission part includes a radio transmitter, wireless receiver, antenna, video encoder, and similar equipment. There are two main types of wireless transmission: analog microwave and digital microwave. 1. **Analog Microwave Transmission**: This method directly modulates the video signal onto a microwave channel (e.g., VS-1800) and transmits it via the antenna. The monitoring center receives the signal through its antenna and demodulates it to retrieve the original video. If PTZ control is needed, a command control transmitter (VS-300T) is installed at the center, and a corresponding receiver (VS-300R) is placed at the front end. This approach offers high clarity, no delay, and no compression loss. It is cost-effective, easy to install, and suitable for situations where there are not many monitoring points and minimal relay requirements. 2. **Digital Microwave Transmission**: In this method, the video is first encoded and compressed before being modulated onto a digital microwave channel (e.g., VS-2454). The signal is then transmitted via the antenna. At the receiving end, the signal is despread, decompressed, and converted back into an analog video signal. Additional software can be used on a computer for decoding, recording, playback, and management. This system supports resolutions like 720x576 and 352x288, with the former offering better quality but higher cost. It introduces a slight delay of 0.2–0.8 seconds. While more expensive, it excels in handling multiple monitoring points, complex environments, and relay-heavy setups. It also offers superior anti-jamming performance and is ideal for large-scale monitoring systems. 3. **Wireless Network Video Server**: Designed for network-based monitoring, this server uses a computer network to transmit real-time video surveillance images over a 10/100Base-T network. It supports ISDN, PSTN, or XDSL routers to extend coverage across LANs, wide area networks, or the Internet. It compresses video using MPEG-4 and audio using G.729A, enabling RS485 PTZ camera control, standard RS232 serial interfaces, and synchronized audio/video input/output. It also features security functions such as system lock, password verification, user authorization, and MAC code validation. **Third, the control section**: This is the core of the security monitoring system. It handles the digital acquisition of analog video signals, compresses them using MPEG-1, records and retrieves monitoring data, and manages hard disk recording. The VS-300T transmitter sends control commands from the central point, while the VS-300R receiver at the site processes these commands and sends them via RS485 to multiple decoders. These decoders then control PTZ cameras, lenses, dust covers, and power operations, offering great flexibility. One command transmitter can control up to 256 receivers. **Fourth, TV wall display section**: This part is responsible for displaying real-time monitoring signals, playing back recorded videos, and retrieving content on monitors or screens. The system supports multi-screen playback, simultaneous recording of all channels, alarm screen alerts, and voice prompts. **Fifth, anti-theft alarm section**: The alarm system uses active infrared motion detectors to monitor key areas and connects them to the central alarm management system. When unauthorized entry occurs during off-hours, the detector immediately sends an alarm signal to the management center. The system then activates linked devices to warn intruders and continuously record video footage. **Sixth, power supply system**: A stable power supply is essential for ensuring the continuous operation of the entire monitoring and alarm system. Any disruption in power can cause the entire system to fail. **Seventh, backend equipment development**: Backend equipment has evolved in two main directions—centralized storage and distributed storage. The primary device used for this purpose is the NVR (Network Video Recorder), which allows flexible and scalable storage solutions for video data.

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