We wanted to explain the concept of DVR in detail in this article, even though it is a widely known term. Besides providing valuable information to end users for their security systems, it will also be helpful to security professionals and integrator for deepening their knowledge about video surveillance systems.
Closed circuit television systems are typically comprised of cameras, transmission mediums, power supplies, video and recording management systems, and display mediums, as well as the operator or consultant, that is, the human factor.
The type of CCTV systems available is either analog or IP-based. Network video systems employ digital signals also transmitted by physical means or wirelessly, whereas the former uses continuous electrical signals that are propagated between the camera and the recording system. The protocol is used in Ethernet-type networks for wireless, but under the protocol.
Analog video systems’ signal management systems normally referred to as DVRs (Digital Video Recorders), include video and recording functions. The same video management and recording software is usually included with the equipment when it comes to small projects. Anytime when you face issues with your DVR or your DVR not work properly you can hire experts for DVR data recovery.
A DVR System can either be a Digital or Analogue one
Video recording devices based on the implantation of video capture cards in a PC machine (personal computer), where the majority is installed on a PCI slot on the system, but you can also connect external equipment via a USB port. As a general rule, Windows is used, or Linux in some cases; the supplied software is installed on the same PC, and through there, the video and recording are managed.
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In addition to their ease of replacement in case of loss of video or needing additional channels (scalable), they can also greatly enhance features (expandable) such as memory, processor, and additional modules.
Its disadvantages include its dependency on the Windows operating system, which is more prone to failures and virus attacks because of environmental degradation, so the equipment investment increases when you have to buy an antivirus license or other software maintenance tools. Their energy consumption is high, they are not usually designed for continuous work, and they can also be affected by high levels of pollution at implementation sites that are not very clean.
A DVR’s other Features
Plugging in USB Devices!
Most USB ports are either meant to connect peripheral elements, such as the mouse or keyboard, or to facilitate the export of videos of short duration and low file size, typically using USB memory sticks.
Getting and Sending Alarm Information
It is basically an option to connect additional elements to an alarm input or alarm output, allowing for the possibility of responding according to the input signal or event. Adding a motion sensor input as an alarm input so that in the event of activation the camera is associated with this signal and creating a signal for an audible alarm as well as an alarm for an external siren or system illumination is just one example of many others.
Flow of Data acrossthe Network
There is a network port in most DVR recordings currently being manufactured that allows for transmission of signals within a data network at 10/100/1000 M bps. Remote viewing of live and recorded video from the camera is possible through software applications or web interfaces. Furthermore, you can create and configure users and system administration profiles according to how the administrator user sees fit, e.g., that other users do or do not have access to certain equipment or parts of it.
Ports for Watching Videos
Typically, these connections are made through VGA, HDMI, or composite video signal ports. Monitors are connected directly to the DVR for displaying images on the equipment.
Inputs and Outputs
In countries or regions where recording audio is against the law, many devices offer the option of being able to record audio through an external microphone and attach it to a specific camera channel.
Ports RS232 and RS485
These are the pins used for controlling PTZ style cameras (or pan, tilt, zoom in Spanish) via long distance communication protocols such as RS485, which generally requires an additional cable to the one used for the video signal.