Gefen 4x4 DVI Dual Link Matrix EXT-DVI-444DL - Manual (Page 11)

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AUTOMATIC LINK SELECTION / DUAL LINK ONLY MODE
The 4x4 DVI DL Matrix has the ability to run both Single Link and Dual Link DVI
sources. There is a feature that will either automatically select the link mode, or lock
the unit in Dual Link mode. By default, Dip Switch 3 is in the OFF position (Automatic
Link Selection). Turning Dip Switch 3 to the ON position will lock the unit in Dual Link
mode and will only allow Dual Link signals to pass properly.
PRE-EMPHASIS
Pre-Emphasis is used to help extend a signal travel over a distance of cable. When
a DVI cable connected to a display is over a long cable, it is recommended that
Pre-Emphasis be enabled. Pre-emphasis is enabled by default on all display
outputs. For short cables, disable pre-emphasis on each output by turing it’s
corresponding Dip Switch to the ON position. If any type of extension device is
used pre-emphasis must be disabled for proper operation.
CONFIGURING THE 4X4 DVI DL MATRIX