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Video Settings
This dialog provides access to all of the key video settings that determine image
quality and link performance.
Threshold
The threshold is effectively a
noise filter that differentiates
between valid video signals
and background noise or
interference. This has the effect
of reducing unnecessary video
signals between the SC5-4xIP
and the remote system, thus
improving performance.
Phase
The phase setting adjusts the
alignment of the host video
output and the remote system
video display to achieve the
sharpest image.
Horizontal Position
Determines the horizontal
position of the host screen
image within the viewer
window.
Vertical Position
Brightness & Contrast
Determines the vertical position
The red, green and
of the host screen image within
blue constituents of the
the viewer window.
brightness and contrast
can be set individually.
Alternatively, use
the Auto button
on the right side to
Custom Modes
automatically optimise
See the next page.
these for the current
Advanced
host and connection
See the next page.
speed.
IMPORTANT: Optimal performance of the SC5-4xIP is dependant on the
calibration of the video for each host computer. For this reason, if you view an
uncalibrated host, the unit will invoke an automatic calibration after a pause of
roughly twenty seconds.
If the video is not calibrated the unit can operate slower than expected and will
affect all users. If you experience a drop in performance on the VNC viewers, try
recalibrating your viewer as a first step.
Calibrate All
Display activity
Click to
Indicates the level
determine the
of video activity
optimum settings
currently in
for all aspects of
progress.
video the video
connection from
the host system.
Using automatic configurations
• Every setting can be individually subjected to an automatic configuration
(click the appropriate 'Auto' button) or can also be manually adjusted.
• Use the 'Calibrate All' button to automatically determine the optimum
settings for all items.
Note: Before using the 'Calibrate All' option, if possible, remove on-screen
display (OSD) elements generated by the SC5-4xIP (such as a menu). These
OSD elements use different video rates to those of the host system(s) and
can affect the setting of the automatic threshold value. SC5-4xIP uses an
improved calculation procedure to filter out the effect of these elements.
However, best results are obtained when the screen contains only host
system information.
Note: To maximise performance, the threshold level is automatically
increased by 50% when a slow link is detected.
Note: When the SC5-4xIP is used with one or more other switches, the
threshold needs to be higher than 32 due to the signal 'noise' that these
switches introduce. The SC5-4xIP configuration should detect such noise and
adjust the threshold accordingly.
Setting the Threshold manually
Occasionally it can be useful to manually adjust the Threshold setting, in order to
achieve a setting that best suits your particular requirements.
1 Use the 'Calibrate All' function to ensure that all other settings are
optimised.
2 Click the Threshold left arrow button to decrement the setting by one and
observe the 'Display Activity' indicator.
3 Repeat step 2 until the Display Activity indicator suddenly rises to a much
higher level (i.e. 50%). This will mean that you have reached the noise
boundary. At this point, increment the Threshold value by 2 or 3 points to
achieve an optimum setting.
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