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CCTV (closed circuit television)

Contributor(s): Lasse Pedersen

CCTV (closed-circuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes.

CCTV relies on strategic placement of cameras, and observation of the camera's input on monitors somewhere. Because the cameras communicate with monitors and/or video recorders across private coaxial cable runs or wireless communication links, they gain the designation "closed-circuit" to indicate that access to their content is limited by design only to those able to see it.

Older CCTV systems used small, low-resolution black and white monitors with no interactive capabilities. Modern CCTV displays can be color, high-resolution displays and can include the ability to zoom in on an image or track something (or someone) among their features. Talk CCTV allows an overseer to speak to people within range of the camera's associated speakers.

CCTV is commonly used for a variety of purposes, including:

  • Maintaining perimeter security in medium- to high-secure areas and installations.
  • Observing behavior of incarcerated inmates and potentially dangerous patients in medical facilities.
  • Traffic monitoring.
  • Overseeing locations that would be hazardous to a human, for example, highly radioactive or toxic industrial environments.
  • Building and grounds security.
  • Obtaining a visual record of activities in situations where it is necessary to maintain proper security or access controls (for example, in a diamond cutting or sorting operation; in banks, casinos, or airports).

CCTV is finding increasing use in law-enforcement, for everything from traffic observation (and automated ticketing) to observation of high-crime areas or neighborhoods. Such use of CCTV technology has fueled privacy concerns in many parts of the world, particularly in those areas in the UK and Europe where it has become a routine part of police procedure.

This was last updated in April 2012

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POS system is really an excellent way to increase sales and boost productivity. I have installed one in my retail store and has seen great boost on my sales and inventory tracking has become a lot simple.
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what are the best type of cctv cameras
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Which Systems are best to use for POE as I need a reliable system that's IP Based but does not need local power for the cameras. Also, the cable runs are around 70 - 100m. Can this be done? 

I have looked at Hikvision and Qviz but none of them will do that kind of distance POE.


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CCTVs are one of the popular tools to safeguard your family and premises. It just needs one-time investment and after that, it will work according to your convenience. One should Install it inside the premises. Yes, it cannot stop the crime but at least it can record all the activities for further investigation.


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The demand for CCTV is on the rise across the world, due to an increase in safety concern among the people. CCTV are widely used by the government as well as private institutions, to avoid or reduce potential security threats. The increase in the demand for CCTV ultimately increases the demand for the CCTV tester. CCTV tester are also known as CCTV field monitors or LCD field monitors and used to view the video from the camera in real time. CCTV testers are also used in order to calibrate or troubleshooting any issue with the system. CCTV tester provides great help for the installer of CCTV to order to view the video feed while installation and make sure that the system functions efficiently. The most basic part of a CCTV tester is a small LCD screen which enables the user to view the camera feed. 
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