CCTV SYSTEM consists of many components, and each component is critical to the quality of the video picture that is reproduced.
Many of you might have a feeling that they can use a normal desk top hard drive for their surveillance needs. They go with this logic thinking that all hard drives are same and operate in a similar manner. But this assumption of them is quite wrong.
Traditional, desktop hard drives are made to operate only for 8 hours a day and 6 days a week. So, the overall work load will be at the most 10%-20% and their performance will be low to moderate. Therefore, they usually exhibit low mean time between failures.
While a surveillance hard drive forms a central component to the digital storage of surveillance video. It can be used in a DVR, NVR, Video Server or a Video Management System in order to work 24 hours a day and 7 days week. These hard drives need to be always active, in order to keep video evidence live.
A system consisting of electronic or other devices designed constructed or adapted to monitor or record images on or in the vicinity of premises.
CCTV surveillance installation (installation):
An installation consisting of the hardware and software components of a CCTV system, fully installed and operational for monitoring on or in the vicinity of premises.
CCTV camera (camera):
A unit containing an imaging device producing a video signal from an optical image.
An enclosure to provide physical and/or environmental protection of the camera, lens and ancillary equipment.
Image, Meta and other data of the CCTV system.
Incident in the real world.
Transfer of data from the original location to a secondary storage location with a minimum of necessary changes.
Condition of the system which prevents the CCTV system or parts thereof functioning normally.
Numbers of frames per second.
Level of illumination on the area to be kept under surveillance.
Visible representation of a frame as a rectangular grid of pixels.
Means by which messages and/or signals are transmitted between CCTV
An optical device for projecting an image of a desired scene on to the photo-sensitive
surface of the imaging device.
Passing an alarm or a message of the CCTV system to an external system.
Authorised individual (a user) using a CCTV system for its intended purpose.
Observation or inspection of persons or premises for security purposes through alarm systems, CCTV systems, or other monitoring methods.
Individual items of equipment which make up a CCTV system when configured together.
Uninterrupted Power Supply (UPS):
A device that provides battery backup in the event that the primary power source to an electrical system is interrupted fails or falls below a level of power which is required for the operation of the electrical system in question. The UPS system may provide backup power for a period of minutes or several hours.
Authorised individual using a CCTV system for its intended purpose
A network video recorder(NVR) records IP cameras wirelessly (for WiFi NVR) or via Ethernet cables (for PoE NVR), while a digital video recorder (DVR) records analog cameras via coaxial cables. That's to say, the NVR is for IP cameras recording and the DVR is for analog or coax based cameras recording.
Dome Security Cameras are named for their dome-like shape. Dome cameras are commonly used in surveillance systems indoor.
Bullet Security Cameras are named for their Bullet-like shape and are waterproof – IP66. Bullet cameras are commonly used in surveillance systems outdoor.
Wide Dynamic Range camera adjusts automatically to bright and dark areas to adjust for and eliminate overexposure and under exposure conditions.
Passive Infrared Sensor security camera is a weatherproof CCTV security camera with a built-in PIR motion sensor light and alarm relay inputs / outputs.
Varifocal is a type of len that can zoom in and out. You can adjust the lens so that it captures a wider area or so that it focuses in more detail on a smaller area.
CCTV cameras outfitted with metal housings or vandal-proof covers as to prevent the lens or camera from becoming damaged or destroyed when there’s maltreatment or physical abuse.
PTZ – Pan/tilt/zoom – cameras allow the camera to be moved left or right (panning), up and down (tilting) and even allow the lens to be zoomed closer or farther. These cameras are used in situations where a live guard or surveillance specialist is there operating the security systems.
C-mount cameras comes with detachable lenses, allows for simple lens changes to fit in different applications. Where standard fixed CCTV lenses can only cover distances of 35-40ft, C-mount cameras can cover distances beyond 40ft.
Not all wireless cameras are IP-based. Some wireless cameras can use alternative modes of wireless transmission. But no matter what the transmission method, the primary benefit to these units is still the same: extreme flexibility in installation.
These cameras comes in both hardwired and wireless, transmit images over the Internet, often compressing the bandwidth so as not to overwhelm the web. IP cameras are easier to install than analog cameras because they do not require a separate cable run or power boost to send images over a longer distance.
These night-vision CCTV cameras have the ability to see images in pitch black conditions using Infrared LEDs and are ideal in outside conditions where lighting is poor to zero.
The day/night CCTV cameras have the distinct advantage of operating in both normal and poorly-lit environments.
With its high resolution lens, capturing images are possible giving viewers a finer detail on captured images.
A panoramic fisheye security camera is the IP surveillance camera that enables you to simultaneously monitor an area overview from a fisheye model (or from a fisheye camera lens), offering you a wider field of view, up to 360 degrees.
A Switched-Mode Power Supply is an AC to DC converter device comes with cable compensation switch from where power is given to cctv cameras.
Surveillance hard drive forms a central component to the digital storage of surveillance video. It can be used in a DVR, NVR, Video Server or a Video Management System in order to work 24 hours a day and 7 days week.
You can power up your security camera by using Power over Coax (PoC) without the need to use extra cables. Just connect a single cable to the camera and you are done. Video, PTZ commands and power sent over coaxial cable makes the installation faster and cheaper.
Power over Ethernet (POE) is a technology that lets network cables carry electrical power.For example, a digital security camera normally requires two connections to be made when it is installed. A network connection, in order to be able to communicate with video recording and display equipment. A power connection, to deliver the electrical power the camera needs to operate however, if the camera is POE-enabled, only the network connection needs to be made, as it will receive its electrical power from this cable as well.