Black Box ACS235A - Manual (Page 15)

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SERVSWITCH™ BRAND FIBER KVM EXTENDERS
the JP1, JP2, and JP3 locations to deactivate the decoupling diodes (so that the
Remote Module leaves the sync signals on the color signals), and remove the
jumpers at JP9 and JP12 to disable VSYNC and force the sync polarity signals
negative (see Sections 3.3.1, 3.3.3, and 3.3.4).
CAUTION!
You can only connect an RGB monitor to a VGA source if the monitor is
able to process the source’s synchronization frequency; for example,
the monitor of a graphic workstation with horizontal bandwidth of 40 to
90 kHz probably won’t work with a VGA graphics adapter that has a
resolution of 640 x 480 = 31.5 kHz.
3.1.3 RGB V
IDEO
S
OURCE TO
RGB M
ONITOR
To connect an RGB video source to an RGB monitor, set the Local Module’s JP6,
JP10
, and JP11 jumpers all to the “RGB settings” (the ones opposite the factory
defaults; see Section 3.2.1). At the Remote Module, install jumpers at the JP1, JP2,
and JP3 locations to deactivate the decoupling diodes (so that the Remote Module
leaves the sync signals on the color signals; see Section 3.3.1).
3.1.4 RGB V
IDEO
S
OURCE TO
VGA M
ONITOR
(RGB
TO
VGA C
ONVERSION
)
To connect an RGB video source to a VGA monitor, set the Local Module’s JP6,
JP10
, and JP11 jumpers all to the “RGB settings” (the ones opposite the factory
defaults), but leave jumper JP2 in its factory setting so that HSYNC, not CSYNC, is
transmitted on the HSYNC lead. Remove the Remote Module’s JP12 jumper in
order to force polarity negative. See Sections 3.2.1 and 3.3.4. In this application,
the Remote Module also functions as a sync stripper: It strips the sync signals from
the color signals, separates them, and presents them as normal TTL signals to the
VGA monitor.
IMPORTANT NOTES
You can only connect a VGA monitor to an RGB video source if the
monitor is able to process the source’s synchronization frequency; for
example, a multisync monitor with horizontal bandwidth of 30 to 90 kHz
probably won’t work with a WF470 graphics adapter that uses a
frequency of 15.625 kHz.
The Extender can not generate the special VGA-standard phase
relation required by some types of dual-scan monitors (LCD panels, etc.).
Be aware that, because of the way some RGB cards output sync
signals, it is possible that, despite how the jumpers are set in your Local
Module, your monitor will still receive CSYNC on its HSYNC lead as well
as VSYNC on its VSYNC lead. Some VGA monitors have no problem
with this, but others will suffer from distorted displays. If your monitor is
affected by this distortion, you can suppress the VSYNC signal by
removing the Remote Module’s JP9 jumper; the monitor should work
fine using CSYNC only. See Section 3.3.3.
Siemens ® users: The Extender can process CP581 signals, but this
requires special cabling. Call Black Box for technical support.