CCTV- CLOSED CIRCUIT TELEVATION also known as video surveillance .CCTV is the use of video cameras which help transmit a signal to a specific place, on a limited set of monitors connect to it.CCTV contain point to point (P2P), point to multipoint (P2MP), or mesh wireless links. CCTV is used in the areas where security is needed such as bars, banks, casinos, schools, hotels, airports, hospitals, restaurants,banks, military installations, convenience stores and other areas.There are about 350 million surveillance cameras worldwide as of 2016. About 65% of these cameras are installed in Asia.
DIGITAL VIDEO RECORDER- is an electronic device that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage devicES in different forms . The term includes set-top boxes with direct to disk recording, portable media players and TV gateways with recording capability, and digital camcorders for data transfer .Personal computers are often connected to video capture devices and used as DVRs. It is used in such cases the application software used to record video is an integral part of the DVR recorder
DISK STORAGE- Disk storage is a general category of storage mechanisms where data are recorded by various electronic substances such as magnetic, optical, or mechanical changes to a surface layer of one or more rotating disks. A disk drive is a device implementing such a storage mechanism
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