CCTV is the acronym of “China Central Television” that means China’s Central Tv, a public television station that is owned by the Chinese Government. The CCTV was founded on 2 September 1958 and is headquartered in Beijing. Is one of the largest communication companies in Asia.
The CCTV has more than 20 television channels aimed at different audiences. CCTV-1 is the generalist channel and the main transmitting information, entertainment and fiction.
CCTV-Closed Circuit Television
CCTV is an abbreviation of the English “closed-circuit television” meaning “closed circuit or CCTV”. In Portuguese, is also known by the acronym CCTV. The closed circuit television consists of a television system consists of cameras located at specific points in order to record and transmit images to one or more local or remote displays.
The CCTV is used with the main objective to monitor certain spaces, which can be private or public (schools, banks, etc.) or even to monitor forest areas.
CCTV also stands for Closed Circuit Television.
Abbreviations, Acronyms And More Acronyms
If these familiar with CCTV and Video surveillance systems, you have probably seen already in numerous sites acronyms such as TVI HD, HD CVI, HD SDI, DVR, HDD, NVR, NDVR, IP… and many others. This time we will focus on the initials HD TVI/CVI/SDI ( High Definition Transport VideoInterface/High Definition Composite Video Interface/High Definition Serial Digital Interface to know) that correspond to a new standard as intermediate step between traditional analog monitoring system and the most current IP systems of high definition, depending on the type of system you want to install you will need a type of video recorder (in later DVR) or other.
Types Of DVR (Digital Video Recorder Or Digital Video Recorder)
At the time of make or renew an CCTV installation it is necessary to know very well the installation environment as well as the budget available, because it will be what will determine type of DVR is adjusted to our needs, pockets and existing facilities.These systems are not always compatible with each other and each of them require a specific camera type or choose to DVR, we proceed to explain the different types of DVR:
Analog DVR: The DVR to which we are accustomed from long time ago, usually 4, 8, 16 or 32 channels ( BNC-type). Used to connect standard cameras with resolution of between 450 and 1000 lines. Analog camera video signal enters the DVR and is is charge of digitize the signal and store it on the hard disk. For this type of facilities typically use a type of coaxial cable (RG59) or failing network cable UTP which connect you at both ends a few Video transceivers to suit the impedance.
DVR TVI/CVI/SDI: This is the intermediate step we mentioned, these DVR´s support traditional cameras commented in the previous paragraph, as well as cameras that give their name to this heading (TVI/CVI/SDI) whose outward appearance is similar to the analog but with resolutions that can reach the 2.4Megapixel (1080 p or higher), taking advantage of all the existing wiring of older installations ultimately making it possible to perform installations of high definition at a cost much lower than their equivalents in IP. There are various standards depending on the manufacturer and they are not compatible each other, we are not going to explain the peculiarities of each technology as it would for another blog entry. The wiring of this type of cameras is done the same way as in the analogue.
DVR pure IP: It is a DVR oriented only to the connection of high-resolution IP cameras, combining the advantages of analogue systems with the advantages of networks into a single system of IP communication (always used UTP cabling to connect them). IP cameras already send the signal to the DVR and to handle higher resolutions, these DVR´s must support high rates of compression to avoid high consumption of bandwidth and storage space. The performance of this type of DVR is measured in Mbps and we must pay special attention to their processing capacity, both locally and remotely. This type of DVR requires the installation of a networkSwitch to connect all cameras video surveillance system or alternatively buy a DVR IP with integrated Switch.
Hybrid DVR or Tribridos: The most complete DVR´s are in what types of supported cameras is concerned, although it should be noted that all channels are shared between all cameras, i.e., a 16-channel hybrid recorder does not support 16 Chambers of each type, but that we will have more or less channels available depending on each type of camera installed.
Recalls that the DVR not only ‘recorded images’, is also capable of managing alarms, make streaming over the internet in real time, play recorded images, extract images and with the help of the different cameras on the market can even perform video recognition of vehicle registration, counting and tracking of people and etc… There are DVR´s based on PC or stand-alone even exist NAS (Network Attached Storage) that may act as a DVR that connect multiple IP cameras to store your recordings.
NVR (Network Video Recorder Or Network Video Recorder)
If in any catalogue or internet you’ve seen the acronym NVR and NDVR, don’t panic, we clarify the concept: an NVR is nothing more than a DVR IP, and we call the DVR hybrids that combine various technologies NDVR. We simply call all DVR recording devices to simplify, but believed necessary to explain here that it is each symbol. We hope that no acronym not has left us out without explaining, however, if you have any questions we encourage you to leave a comment.
The Importance Of The Hard Disk
Apparently out all types of DVR are the same, but nothing is further from the truth, the difference in price between a DVR and another is precisely inside, in the processing power of their hardware, management that makes it your software as well as many other functions of added value that each manufacturer integrates into their devices. Another key component of the DVR is the hard drive (in later HDD), because the HDD is not only storage capacity, we agree that to higher capacity HDD more number of days or number of cameras can store, we must take care of the same quality, but we want to run the risk of suffering from a problem in the recording at the most inopportune time in the case of a mission-critical as it is a Video surveillance system.
At Emopa we always integrate HDD´s the best manufacturers (Western Digital or Seagate) and always range optimized forCCTV, this provides the best possible performance as well as high availability (24 × 7) of the Video surveillance system, thus responding to the needs of any environment, and even in those places where safety is paramount.
Who are these HDD´s that makes them so important? Each manufacturer implements improvements believes necessary to improve performance, but the most notable benefits are:
- Firmware optimized for video surveillance that improves the reliability of the unit up to a 30% and helps to reduce data loss.
- Cache algorithms personalized for demanding applications in writing, with low-speed transmission and large numbers of streams as in surveillance systems
- Low energy consumption which is crucial in environments of video surveillance that operate continuously and low heat emissions that improve the reliability of the unit in the long run.
- Built to be compatible with the leading manufacturers of chipsets and chassis of surveillance systems.
- Optimized to support up to 32/64 high definition cameras.
- Sensors that keep optimal performance in systems of multiple units.
- Index of workload of 180 TB per year, 3 times higher than for desktop drives, along with a MTBF of 1 million hours.