Northeast Remote Surveillance and Alarm, LLC– Video recorders explained, years ago legacy time-lapse video recorders were the only option. They used multiplexers which were useful in sending a few frames per minute to a VHS tape. Playback of a video was a very quick snapshot of all the cameras on the multiplexer. You would see an individual for a quick glimpse, and they would be gone. The video transported thru coaxial cable.
DVR (digital video recorders) replaced VHS and multiplexers benefits included improved search features with the ability to concentrate on a single or multiple cameras on playback. Recording rate also know as frames per second improved allowing a much higher frame rate permitting the recording of fluid motion instead of still frame pictures. These DVR’s used the same .3 megapixel technology. Due to low pixel density, the cameras had to be focused on a small area to achieve good clarity.
NVR recorders were designed to work with IP cameras. IP cameras use Internet Protocol, and images are transported across a network identical to what computers run on using cat5 cable. IP cameras process the video image in the camera and do not require anything more that a PC to for live views. The first IP cameras required a separate power supply, today the power for cameras is capable of POE (Power over Ethernet) switches. These POE cameras and when use deployed With POE switches make use of the four unused wires in the eight wire ca5 or cat six cables to supply power for the cameras. Some of the newer NVR’s also have built in POE. Network Video Recorders can also accept analog cameras on the coaxial wire, or video balun with twisted pair cable combined wire video encoders that convert the analog video signal to Internet protocol. NVR’s are either stand alone or PC based. If you are looking for more than 3-megapixel cameras IP cameras are currently your only option. IP cameras provide the most economical option for large facilities and wireless installations
Analog HD video recorders technologies include TVI, CVI, AHD, SDI, HD-SDI all of which transfer a signal from the camera for processing at the DVR. Unlike IP cameras the camera image cannot be viewed on a PC until they are processed by the DVR compatible with the camera technology or handheld testing device. These Analog HD systems are typically limited to 3 megapixels signals are transported on the coaxial cable or video baluns that make use of twisted pair wire.
Hybrid Video Recorders now allow the use of legacy analog, analog HD cameras and IP cameras on the same system. These hybrid systems have limitations however they are useful for smaller properties with limited budgets that will benefit from IP cameras, wireless network or a camera feed carried by an internet service provider from another location.
As you can see NRSEC is well versed in integrating all available technologies. We custom design Integrated Systems wired, wireless, and hybrid using both technologies to include access control, alarms, intercoms, pa systems and more. Thank you for your interest in Video Recorders Explained
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