User manual Extron electronic MTPX Plus Series

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Skew equalization  
Skew exists between wire pairs when the physical length of one wire pair is  
different from another. Skew affects the displayed image when the differential  
length between wire pairs exceeds 2 feet, causing the timing of the red, green, and  
blue video signals to appear out of alignment (horizontal registration errors). The  
signals transmitted on the shortest pair are shifted to the left if you are viewing  
white lines on a black background. A white vertical line on a black ꢀeld can  
appear as individual red, green, and blue lines that are close together; the signal  
transmitted on the shortest wire pair leads the other colors and appears to the left  
on the display. As the transmission cable length increases, the skew effect increases.  
The MTPX Plus has a skew equalizer function that is available using SIS, the  
Windows-based control program, or built-in HTML page control. The skew  
function provides separate time delay circuits, on the red, green, and blue video  
lines on the inputs and the outputs. Each time delay circuit can be independently  
adjusted,ꢀfromꢀ0ꢀtoꢀ62ꢀnanoseconds,ꢀtoꢀproperlyꢀalignꢀtheꢀred,ꢀgreen,ꢀandꢀblueꢀvideoꢀ  
signals on the displayed image. When correctly set, the red, green, or blue video  
signal on the shortest wire pair is delayed to properly converge the displayed video  
image.  
UTP cable test equipment measures and reports wire pair length. The report on  
the various pair lengths can be used to properly equalize pair skew. If UTP cable  
test measurement cannot be done, pair skew can still be equalized by viewing  
a test pattern with a critical eye. Examine the test pattern for loss of horizontal  
registration and, through a process of trial and error, equalize any pair skew.  
Definitions  
The following terms, which apply to all Extron matrix switchers, are used  
throughout this manual:  
Tie — An input-to-output connection  
Set of ties — An input tied to two or more outputs. (An output can never be tied to  
more than one input.)  
Conꢀguration — One or more ties or one or more sets of ties  
Current conꢀguration — The conꢀguration that is currently active in the switcher  
(
also called “conꢀguration 0”)  
Global memory preset — A conꢀguration that has been stored. Up to 32 global  
memory presets can be stored in memory. Preset locations are assigned  
to the input buttons and output buttons. When a preset is retrieved from  
memory, it becomes the current conꢀguration.  
All 32 global presets can be selected from the front panel for either saving or  
retrieving.  
Room — A subset of outputs that are logically related to each other, as determined  
by the operator. The switchers support up to 10 rooms, each of which can  
consistꢀofꢀfromꢀ1ꢀtoꢀ16ꢀoutputs.  
Room memory preset — A conꢀguration consisting of outputs in a single room  
that has been stored. When a room preset is retrieved from memory, it  
becomes the current conꢀguration.  
MTPX Plus Twisted Pair Matrix Switchers • Introduction  
1-7  

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