Video Compensation - ADDER CATx User Manual

Video compensation

The AdderView CATx units allow computer systems to be placed up to 50m
(160 feet) away and remote users to be extended by a maximum of 300m (980
feet). Such long cable lengths can affect video signals, especially when higher
screen resolutions are used. In order to eliminate any video signal degradation,
all AdderView CATx units and accompanying Adder X100 extenders provide
effective software-based video compensation features.
Two main types of video compensation are provided within the AdderView CATx
installation, these are:
• Computer video compensation - operates on video signals between each
computer system and the AdderView CATx unit. See
compensation.
• Remote user video compensation - operates on video signals between
each remote user(s) and the AdderView CATx unit. See
compensation for details.
Note: For installations where both computers and remote users require video
compensation, always ensure that the computers are compensated first.
• A third type of video compensation is provided by Adder X100AS/R extender
modules only. This type of compensation is called Skew adjustment and
combats the effect of uneven twisted pairs within link cables.
See Remote user skew adjustment
Computer video
Remote user video
for details.
It is important to note that, providing the cabling arrangements do not change,
the various video compensations need to be applied only once to each computer
or remote user link. During operation, control of video compensation is fully
automatic. Please take into account the following when configuring links:
• The AdderView CATx stores a video compensation setting for each
computer which defines the level of compensation that is applied whenever
the computer is selected. This "computer video compensation" setting
is to correct for any video clarity loss due to the CATx cable between the
AdderView CATx unit and the computer's CAM.
• CATx cables below 10m give very little loss and so it is not normally
necessary to be concerned about setting any computer video compensation
if short CATx cables are being used between the AdderView CATx and the
CAM for each computer.
• "Computer video compensation" may be setup by typing in the cable
distance in the OSD or, if very fine video adjustment is desired, by observing
the video picture on the local (user 1) port whilst making adjustments.
• If a cascade of switches is being used, computer video compensation only
needs to be applied at the master AdderView CATx.
• "Remote user video compensation" compensates for and CATx cable loss
introduced by the cable between the X100 and the AdderView CATx. The
required video compensation setting does not vary as any "computer video
compensation" is automatically added as different computers are selected.
This only needs to be setup once during installation.
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