Matrix Switchers Introduction
 In signal management, a switcher is a device that allows you to connect to multiple video sources and select one for output to a display device. For example, if you have six computers and you want to choose one for display on a monitor, you would connect a 6-In, 1-Out switcher between the computers and the monitor.
If your system involves multiple video sources and multiple displays, there are other products you should consider. If you wish to view any source on any display, you may need to use a matrix switcher. If you intend to always show the same image on all of the displays, you could use a distribution amplifier on the output of the switcher.
Some ALTINEX switchers utilize relays internally. This enables all of the channels to be used for a variety of signal types. However, relay switchers do not buffer or amplify the source signal — a good reason why it is often desirable to use an interface or distribution amplifier either before or after a switcher if the system makes use of long cable runs.
Switchers automatically terminate the source signal to 75 ohms if the source is not selected. If it is selected, the signal passes through and must be terminated at the display. Switchers typically provide the same connector type on both their inputs and outputs. For instance, a VGA switcher offers all 15-pin HD female connectors. Switchers do not provide signal-processing capabilities; the sources and displays must be compatible with each other in terms of both scan-rate and signal format.
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