Network video server, also known as video server, English name is Digital Video Server, referred to as DVS, is a video surveillance device developed in recent years. With the development of network technology and the popularity of broadband network, network video surveillance will gradually encroach on traditional video surveillance. Market share of equipment.
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Video server technical features
Although the DVR also has network monitoring capabilities, the current mainstream network monitoring device is still a video server. It can convert analog video, audio or voice signals into digital signals and transmit them over IP networks. At the same time, network video servers also have many auxiliary functions such as alarm and pan/tilt control. The video server generally includes an audio and video collection part, a central processing unit, a data encoding part, a network part, and an alarm pan/tilt control part. Since the data output from the camera to the DVS is an analog signal, and the signal transmitted in the network is a digital signal, the A/D converted video and audio acquisition must be made into a digital signal. However, the amount of digital signal data after A/D conversion is quite large. At present, the bandwidth of computer networks in China is limited, and it is impossible to transmit a large amount of data streams. This requires encoding compression processing to ensure the image clarity while ensuring the image clarity. Compressed, compressed data that becomes small traffic can be transmitted over the Internet. The network part needs to support network protocols such as DHCP, DDNS, UPNP, and NFS.
Some of the basic features of the current popular video server are:
1, the model is small. Generally, it is usually 1-4 channels of analog video input. It does not have more than a dozen video inputs like a hard disk recorder, and it does not carry a hard disk randomly. Putting the storage device in the monitoring center is more conducive to the storage and protection of image data. Save a lot of space.
2, simplicity. Through the current fast-developing, cost-effective computer communication network to transmit video data to the monitoring center, only a low-cost Category 5 network cable is needed. If the video server has a WIFI module inside, and adopts the wireless LAN mode, then even 5 classes Network cables are saved.
3. Powerful center control. An industrial standard server and a set of control management application software can run the entire monitoring system. Users only need to open a client program on a computer connected to the Internet, and enter the IP address of the corresponding video server to perform full remote operation. Monitoring. Any authorized client can access any camera directly, or access the monitored image through a central server.
4. Easy to upgrade and fully scalable. Easily add more cameras, and the central server will be able to easily upgrade to faster processors, larger capacity disk drives, and more bandwidth in the future.
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