Extron electronic MVX VGA A Installation, cont’d, Video connections, Sync Impedance switches

PRELIMINARY

Installation, cont’d

Video connections

NThe matrix switcher does not alter the video signal in any way. The signal output by the switcher is in the same format as the input.

NThe MVX matrix switchers can also switch RGBS, RGsB, RsGsBs, component video, S-video, or composite video with the appropriate adapters.

A	RGB video inputs — Connect the analog computer-video sources to these
	15-pin HD female connectors.

NMost laptop or notebook computers have an external video port, but they require special commands to output the video to that connector. Also, a laptop’s screen shuts off once the external video port is activated. See the computer’s user’s guide for details, or contact Extron for a list of common laptop keyboard commands.

B	RGB video outputs — Connect RGBHV video displays to these 15-pin HD
	female connectors for each output.

Sync Impedance switches

NThe MVX VGA 128 A does not have the described Sync Impedance switches.

C	Sync Impedance switches — The MVX 1212 VGA A, MVX 168 VGA A, and
	MVX 1616 VGA A matrix switchers have Sync Impedance switches on the rear
	panel for outputs 1 through 8 (figure 2-3) to compensate the impendance for
	different cable types and lengths. The switches provide a way to condition
	the output, enabling the sync to be properly passed from output to the
	display.
	SYNC IMPEDANCE									4
									50
	1	2	3	4	5	6	7	8	75
	1	2	3	4	5	6	7	8
			OUTPUT

MVX 1212 A, MVX 168 A and MVX 1616 A

Figure 2-3 — Sync Impedance switches

Each switch provides the option of selecting either 50 ohms or 75 ohms. The 50 ohms position is required only when a sync problem is encountered. The normal position is 75 ohms.

NAn input producing an out-of-sync display — a display that is rolling vertically and/or tearing horizontally — could indicate an impedance problem.

2-4 MVX VGA A Matrix Switchers • Installation