other systems such as access control, building management, and industrial control. This allows
users to manage video and other building controls through a single program and user interface.
For more on servers and storage, see Chapter 12.
Figure 11.1a A network video surveillance system based on a open, PC server platform with AXIS Camera Station video
management software.
11.1.2 NVR platform
A network video recorder comes as a hardware box with preinstalled video management func-
tionalities. In this sense, an NVR is similar to a DVR. (Some DVRs, often called hybrid DVRs, also
include an NVR function; i.e., the ability to also record network-based video.)
An NVR hardware is often proprietary and specically designed for video management. It is
dedicated to its specic tasks of recording, analyzing and playing back network video, and often
does not allow for any other applications to reside on them. The operating system can be
Windows, UNIX/Linux or proprietary.
An NVR is designed to oer optimal performance for up to a set number of cameras, and is
normally less scalable than a PC server-based system. This makes the unit suitable for smaller
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