What is CCTV camera?

CCTV camera or “Closet Circuit Television” are cameras that have a fixed place and you cannot move them. Another common term used for it is “Video Surveillance”. CCTV cameras send signals to a specified place for a specified number of monitors.

Banks, offices, airports, military places and shops are most common users of video surveillance.

 

 

 

Instructions to buy CCTV camera

CCTV types in terms of form and performance

 

DOME cameras

DOME are CCTV cameras that designed half sphere (circular). Because of their shape, these cameras are flexible for ceilings and it called ceiling cameras.

 

BULLET cameras

These cameras have a cylindrical shape with a base, although you can install it on ceilings, it is better on the walls. These cameras are usually waterproof and can be useful outdoor. Bullet and Dome cameras are only different in shape and installation place.

Industrial cameras

Industrial cameras usually have a rectangular cube shape that used in an industrial cover with a separate base. As you can say by their name, these cameras are suitable for industrial environment and plants.

Speed Dome cameras

In these cameras, an engine designed for camera rotation and you can control software and hardware of it with a remote, you can zoom or change it to different angles.  Some of these cameras have a memory for angles and they can automatically find and zoom on specified areas.

Speed Dome cameras are commonly used in public spaces with traffic and places that need to zoom via control rooms.

 

CCTV cameras types in terms of Communication platform format

Analog cameras (old)

Oldest type of CCTV cameras are analog that connect to the main system via coaxial cable and analog signals. These cameras frames usually have high noises because of using analog system. Video quality of these cameras figured by TVL. More TVL means higher quality of pictures.

AHD cameras (HD)

AHD cameras are a new generation of CCTV cameras that connect to main system through coaxial cable but using digital technology on analog base. Therefore, picture quality if them evaluated by mega pixel and have far more quality than old analog cameras. Different brands of CCTV cameras using different formats for decoding that most famous of them are AHD, Turbo HD and HDCVI.

Because of reasonable prices of AHD cameras, they are getting popular these days in smaller projects.

IP cameras (network)

Best and naturally, most expensive CCTV cameras in market are IP cameras. These cameras use networking technology for connection to main system or server and that is why they have the highest quality. Picture quality of these cameras is also on mega pixel but in a same technical situation and IP camera have a better quality than AHD.

Due to the possibility of designing a network subnet according to different algorithms and possibility of using node and switch in installation of IP cameras they get recommend for big projects.

 

 

 

Which technology of camera to use?  

First benchmark of buying any product is your budget. If you have no such kind of limitation, the best option in both quality and look is using IP cameras. However, if you are looking for cheaper options you should consider your project size.

Small Scale:

In small scare projects (under 16 cameras), that mostly includes small shops, small offices and houses using an AHD camera is reasonable.

Medium Scale:

In medium scale projects (between 16-32 cameras), cameras distance from main system is vital because it will raise cost of cables in long distances and using IP technology is more reasonable and cost effective. Although in short distances, you may still want to consider AHD.

Large Scale:

In large-scale projects (more than 32 cameras) or in large distances using IP technology is necessary and best choice available.

Specify your spaces:

Before choosing and buying CCTV cameras, you should specify spaces. First, you should separate with roof and outdoor spaces, because you should use outdoor cameras for outdoor spaces and then consider separated areas. Cameras usually can cover a radius of between 30 to 50 meters. Thus for more accurate cover of cameras we should separate areas by the cameras range. In addition, you should not install CCTV cameras on Metal surfaces or obstacles because camera’s IR ray hits things and gets back in nights, so spaces should be done correctly.

 

 


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