Black Box ACS236A, ACS235A manual Setting Vsync jumper JP9

SERVSWITCH™ BRAND FIBER KVM EXTENDERS

4.2.2VSYNC ENABLE/DISABLE JUMPER JP9

It is possible to use the Extender to connect a VGA monitor to a legacy Sun computer that outputs Sun video with CSYNC superimposed on the green signal. (If you do this, make sure that jumpers JP2 and JP10 in the Local Module are both installed; see Section 4.1.1.)

In this situation, depending on the computer, the Remote Module might express only CSYNC (composite sync) on the HSYNC lead of its VGA connector, or it might express both CSYNC on HSYNC and VSYNC (vertical sync) on the VSYNC lead. If your VGA monitor works fine even with both signals coming through, leave jumper JP9 installed (the factory-default setting). But if your VGA monitor’s picture becomes distorted if the monitor receives both CSYNC on HSYNC and VSYNC on VSYNC, remove jumper JP9 as shown in Figure 4-7. This causes the Remote Module to suppress the VSYNC signal so that only CSYNC is expressed. Most VGA monitors, including most of those that have problems when they receive both signals, work well using the CSYNC signal alone.

CSYNC and VSYNC	CSYNC only,
(factory default)	VSYNC disabled

JP9

InstalledRemoved

Figure 4-7. Setting VSYNC jumper JP9.

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