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• NTSC stands for National Television Standards Committee. It is the color video signal television standard: 525 lines, 60Hz
• PAL stands for Phase Alternate Line. It is the color video signal television standard: 625 lines, 50Hz

IR is the abbreviation for Infrared. IR cameras have image sensors that are designed to sense and process infrared light emitted from IR LEDs. Similar to Day & Night cameras, IR cameras turned to monochrome mode when illumination falls below a certain Lux. An IR camera differs from a Day & Night camera in which an IR camera is able to capture video images in absolute darkness with the help of infrared light source.

A PC-based digital video recorder is basically a personal computer that has been modified with hardware and software to work as a DVR. An embedded digital video recorder is a video recording machine that has been manufactured specifically to record video input from CCTV cameras. In embedded DVRs, there is typically one circuit board with software burned into its processor chip.

There used to be significant differences in features between the PC-based and the embedded machines. But with recent advancements in the embedded DVR technologies, the differences are becoming less. The advantage of an embedded digital video recorder is that they are extremely stable and reliable as they consist of fewer circuitry parts. The software is often written in basic machine code or Linux code which tends to be more stable.

The advantage of the PC-based digital video recorders is that they are easier to interact with because you use the on-screen menus and a mouse (as opposed to embedded which you interact with more like a VCR - via buttons). And you tend to have more features and options on the PC-based machines.

If you need to keep a welcome message in your PABX, Please follow the steps like this video:

Frames per second (fps) relates to how many pictures the DVR can record in a second. Real-time recording is about 30 fps. To calculate the fps per camera, take the total fps that the system could offer and divide it by the number of video inputs. For example, a 100 fps DVR with 4 video inputs would give u 100/4, 25fps per camera.