A CCTV system stands for Closed Circuit Television. The circuit in this surveillance system is totally closed and all the elements are connected. Conversely, a digital system allows for remote control of cameras and better visual data, meaning that a person can see things and faces more clearly due to improved optics and zooming. Data is accumulated digitally, not on tape and this means that it can be recovered instantaneously.
Closed-circuit television (CCTV) is the use of video cameras to transmit a signal to a specific place, to a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted. The increasing demand for trains with video surveillance systems is an expansion which will indisputably effect the rail industry and it is imminent that within ten years the installation of video surveillance systems will become the industry standard. The installation of video surveillance equipment on board trains is apparent for a number of reasons such as the protection of company assets and the protection of the environment and creation of "safe zones" in public areas.
There is many surveillance system. One of them video surveillance systems is modular, elastic, and scalable. They can be tailored to fit all the security requirements, while keeping the budget in mind. Video Surveillance Systems include digital video recorders, DVR cards, USB (universal serial bus) capture devices and remote video surveillance software. The Remote Witness video surveillance software allows the users to record motion activated high-resolution digital video and display multiple cameras simultaneously from the camera location or a remote site.
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