.
APPENDIX B: DC Restore
17
Appendix B. DC Restoration of AC
coupled source
The Cat5 Multi VGA system is designed to function with DC coupled signals
with the black level referenced to 0 volts. Nearly all VGA cards function this
way. However, some media servers or digital camera devices provide AC
coupled signals and can cause a green color shift in the video. This is a result
of the sync clamping on the Red and Blue channels. The single port
transmitter has been designed with full DC restore capability. A simple switch
setting is all that is required.
The following diagrams show the switch location and settings for the
AC1004A-R3 transmitter assembly.
Note: Switch settings other than shown below may result in unpredictable
performance and are not supported by Black Box.
DC restore / AC coupling options:
Disable: AC Coupling to A
(Default) DC Restore to A
Internal SW5 position 1 OFF (default)
Mode 1 AC Coupling to B
Enable DC Restore to B
Internal SW5 position 1 OFF (default)
Mode 2 AC Coupling to B
Enable DC Restore to A
Internal SW5 position 1 ON
