Surveillance System (abbreviation CCTV - Closed Circuit Television Systems) - designed for the video surveillance on important facilities.

Analog video surveillance system - is a classical system based on analog cameras and transmitting the image signal over coaxial cable.

1. All analog camcorders have CCD. These video cameras are optical devices, CCDs which form the video signal of the light flux passing through the objective lens and a group of lenses and impinging on the matrix.
2. Lenses for CCTV cameras installed on the camcorder in order to increase the range, improving the technical parameters of the camcorder and accessories to specific operating conditions. Surveillance of moving objects using lenses with variable focal length - zoom lenses. In a rapidly changing light use lenses with auto iris.
3. Rotation device for CCTV cameras. Wider viewing angle cameras and tracking of moving objects CCTV camera mounted on the rotary device. Rotator mechanism moves the camera in the horizontal and vertical directions, and allows the operator to view a video surveillance system camera sufficiently large protected areas.
4. Video Recorder (DVR , video recorder - DVR, video servers) are designed for recording, storage and subsequent playback images coming from the cameras. Digital recording device (DVR) should to write video in a digital format directly to your hard disk. Typically, DVRs are equipped with the latest models of movement sensors in the frame - motion detectors and automatically recording the video, as well as have a network card to connect to the DVR surveillance system for LAN / WAN network. Distinguish between single-channel and multi-channel DVRs 4, 6 , 8, 16 .
5. Monitor is used for displays an image and show archive recording.
6. Secondary power supply 12 V or 24 V.

Digital CCTV or IP video surveillance - a system based on IP cameras and transmit digital images over the network .
1. Camcorder. These camcorders have a digital signal processing unit, built-in web browser and form a high quality picture that can be transmitted as a digital signal on the LAN / WAN network surveillance systems. Digital or network cameras used on large sites, equipped with local computer networks, as well as where you want to create a geographically distributed video surveillance systems. Typically, digital cameras have the analog and digital output .
2 . IP video server (encoder) - a device for digitizing (coding) compression and broadcast Ethernet network video from analog video cameras. Can process images from multiple cameras.
3 . Personal computer connected to a network , you can view an image with IP and analog (via server) camcorders, and stored on the hard disk records of video archive .
4 . Monitor displays an image and show the archive recording.
5 . Secondary power supply 12 V or 24 V.

Pros IP surveillance :
1. Scalability from one camera to several thousand.
2 . Viewing video from any remote sites in the presence of data channels .
3 . Multi-user access to a camcorder via the WEB browser
4 . Connecting to an existing LAN
5 . Built-in intelligence of video processing .
6. High resolution and image quality.
7. Digital Flow enables the production of not only video camcorder, but the signal from the microphone, with sensors in the camera, organize two-way audio communication, manage settings and camera settings in real-time and event, telemetry control .
8. Ability to transmit information via radio channel by using the wireless data transmission technology WiFi.

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