Switchers are devices used with multiple camera systems. Although primarily used in commercial building security and surveillance systems, they can be
scaled to fit the needs of a home security system.
They enable several cameras to be used with a single monitor. The switcher can be programmed to
cycle through all the cameras in a surveillance system or dwell on each cam-
era for a specified length of time, usually in the range of 1–60 seconds.
Exterior sensors can detect movement and cause cameras to start recording
the image on a VCR.
Quads are special devices that enable the viewer to simultaneously record
and monitor four cameras.
It does this by splitting your screen into four sections. The normal configuration for connecting a quad switcher with a sen-
sor and a VCR is shown in this picture, which illustrates the connections
between a quad, a monitor, and four surveillance cameras. The monitor can
view all four images at the same time.
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