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System Cctv

CCTV , Closed Circuit TV,101

CCTV stands for closed circuit television, In Closed Circuit TV (CCTV), the picture is viewed or recorded, but not broadcasted, and it is a visual surveillance technology designed to monitor a variety of environments and activities. CCTV systems typically involve a fixed (or "dedicated") communications link between cameras and monitors.  It was initially developed as means of security for banks and casinos; however, today it has been developed to the point where it is simple and inexpensive enough to be used with Home Security Systems, and for everyday surveillance. CCTV has many industrial and scientific applications, including electron microscopy, medical imaging and robotics, but the term "closed circuit TV" refers most often to security and surveillance camera systems.

 

Uses of CCTV:

1.  Detecting crimes or solving a crime that's already occurred.

The use of CCTV cameras in crime prevention is well known. The security of banks and other government establishments in the present day and age is incomplete without the installation of CCTV camera systems. They can be used to keep a record of things and in  the instance of a crime, the sequence of events can be studied later on. Quite naturally, these cameras are put in place in city centers, shopping malls, and gas stations where there are more chances of such untoward incidents happening. Although CCTV is used in crime prevention but there is no evidence to really back that up, for instance about 20 percent of the world's CCTV cameras are implanted in the UK and about 78 percent of the governments crime prevention budget was spent on CCTV cameras during the 1990's which is a huge amount of money on something where there is no proof that it has actually been effective.

 

2.  Hospitals.

CCTV is most commonly used for surveillance, CCTV networks can be used in hospitals to allow nurses to keep an eye on multiple patients at the same time, and they can also be used to monitor traffic at busy intersections.

 

3.  Improving the safety of public transportation systems.

The installation of these cameras on strategic positions helps authorities to be doubly sure that nobody is near the doors when a train is starting, for instance.

 

4.  Recording events.

To be used as an evidence and to inform investigations. For instance, on the boundaries of the Parliamentary estate, police on patrol alert CCTV operators of incidents via radio links. CCTV operators then record incidents as they unfold.

 

5.  Other common forms of CCTV.

These forms include live on-site video displays for special events such as various conventions, arena sports and concerts as well as pay-per-view telecasts of sporting events such as boxing and pro wrestling. Also a common user of CCTV is "in-house" television channels that broadcast to very small and specific receivers such as in hospitals, airports, racetracks, schools, malls, grocery stores, and municipal buildings. The latest use of CCTV cameras is in cars and vehicles to assist drivers in parking and reversing.

What are the various types of CCTV lenses, and how does one choose which lens to use?

There are four types of lenses for CCTV use: Fixed Aperture, Manual Iris, Auto Iris, and Zoom. If the area you wish to observe experiences infrequent changes in light, use a manual iris lens, which can be adjusted for light only by hand. If the area that the Security Camera will be observing experiences frequent changes in light, use an auto-iris lens. These lenses adjust to light changes automatically. Auto-iris lenses come in Video or DC, and cameras generally support one format or the other. Be sure your lens matches the camera. To perform close-ups, get a zoom lens, manual and motorized zoom lenses are easily available from most retailers.

A drawback of CCTV;

The widespread availability and use of CCTV cameras have a draw back in, that is they may be used by criminals to gather vital data about other innocent victims. Secretly installed cameras around ATM machines can track the pin number of an unsuspecting user and transmit the data wirelessly to the criminal. There is also the possibility that hidden cameras might be used by perverts to prey on their victims remotely or record them in compromising positions and use this data to black mail or extort money.

Your class now is over and now all of your questions are answered. CCTV has many advantages and a few disadvantages because of that, it is commonly used all over the world, I believe CCTV 101 tells you why. Follow our articles and documentaries, and be aware: do not miss a class.

About the Author

2mcctv.com
2mSolutions Security Group Provides the unique expertise to bring the perfect solutions to your commercial, educational, and governmental security necessities.

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Suite 130 Grand Prairie Tx. 75052

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Isra'a Sabha       
Technical Writer
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What is the difference between a "regular" Coax CCTV system vs POE CCTV system?

Any advantages, disadvantages, costs? Thanks!

CCTV cameras can be catagorized by how they are powered. the oldest type have separate DC power in and video out connectors. Then they started putting the DC voltage on the coax which became both the input and output for the camera, that was a one cable solution. i think this is what you are calling 'regular'. POE means that the camera is digital output on an ethernet, but the ethernet is a special kind that also provides DC power. This makes the camera work similar to USB connected web cameras that get 5 volt power from the computer via USB cable. i have done only one POE installation, it was for a LAN connected microwave converter where the radio was located at the parabolic dish.

POE requires special equipment, to inject the DC on the cat5 cable. normal ethernet devices are not made to handle significant current on the wiring, if you have multiple cameras connected by a ethernet switch, that switch is a special kind that passes the operating voltage to all the connected cat5 cables.

imho, running a single RG59 to each CCTV camera position is a much simpler solution than networking.

A tour of an AMCO CCTV system