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Figure 3. A video encoder rack can support up to 84 analog channels. 1.4
Creating a future-proof system Video encoders offer a valuable solution to the challenge of migrating analog CCTV video to IP-Surveil- lance. This is particularly true when it comes to enterprise installations where there may be a great number of analog cameras that represents a large investment that must be protected. By using video encoders in an analog video surveillance system, a security manager can obtain many useful features of a network video system while still maintaining the earlier analog investments.
Furthermore, it creates a more future-proof video surveillance system that allows users to add network cameras and experience all the benefits of a network video system, including high-resolution video with progressive scan, megapixel and HDTV image quality.
2. 2.1
A closer look: the evolution of video surveillance systems VCR-based analog CCTV systems
VCR
Analog cameras
Analog Coax Cabling
Quad/Multiplexer Monitor Figure 4 Diagram showing a classical analog video surveillance system. 2.2 DVR-based analog CCTV system
Analog cameras
Analog Coax Cabling
DVR
Monitor
Figure 5 A surveillance system with analog cameras that are connected to a DVR, which includes the quad or multiplexer func- tionality and provides digital recording.
The introduction of the DVR system provided the following major advantages:
> No tapes and tape changes > Consistent recording quality > Ability to quickly search through recorded video