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third party suppliers to make other combinations. (See Table 3)
FIGURE 7: Velocity RGB-9 Transmitter
The CPU and the TX Connector
Video connections to the CPU are made between the video output card of the CPU and the TX VGA
connector labeled "FROM CPU" (closest to fiber connectors). The additional video connector is for a
local administrator to view the video output at the TX unit.
The analog VGA inputs are converted to a fiber optic suitable form and transmitted to the RX unit.
Modifying the Analog RGB Video Parameters
It is possible for one resolution to have different video timings, which could cause a less than perfect
display on the remote side. For example, take 1280x1024x60 Hz. The VESA standard has 1688 pixels
in one line, whereas a SGI format has 1680 pixels. The transmitter lookup table is configured for the
VESA standard, but can be easily modified to support the SGI format. (Refer to Section 7.2.6 for step by
step instructions.)
FIGURE 14
FIGURE 15
FIGURE 14: 1280x1024x60 on an SGI computer with the PLLDIV set at 1688 (default value).
Notice
the columns.
FIGURE 15: 1280x1024x60 on an SGI computer with the PLLDIV modified to 1680.
Revision D
8
December 2012
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