Video compensation
The ServSwitch CX units allow server 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 ServSwitch CX units and accompanying ServSwitch CX Remote extenders provide effective
Two main types of video compensation are provided within the ServSwitch CX installation, these are:
•Server video compensation - operates on video signals between each server system and the ServSwitch CX unit. See Server video compensation for details.
•Remote user video compensation - operates on video signals between each remote user(s) and the ServSwitch CX unit. See Remote user video compensation for details.
| Remote user |
| Server |
| |
| video |
| video |
| |
| compensation |
| compensation |
| |
REMOTE | CX R | SAM | SERVER | ||
USER | SYSTEM | ||||
|
|
| |||
| 300 metres (980 feet) |
| 50 metres |
| |
| maximum |
| (160 feet) |
| |
|
|
| maximum |
|
Overall maximum length between any remote user and any server system must not exceed 300 metres (980 feet)
Note: For installations where both servers and remote users require video compensation, always ensure that the servers are compensated first.
•A third type of video compensation is provided by Black Box ServSwitch CX remote AS/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 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 server or remote user link. During operation, control of video compensation is fully automatic. Please take into account the following when configuring links:
•The ServSwitch CX stores a video compensation setting for each server which defines the level of compensation that is applied whenever the server is selected. This “server video compensation” setting is to correct for any video clarity loss due to the CATx cable between the ServSwitch CX unit and the server’s SAM.
•CATx cables below 10m (30 feet) give very little loss and so it is not normally necessary to be concerned about setting any server video compensation if short CATx cables are being used between the ServSwitch CX and the SAM for each server.
•“Server 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, server video compensation only needs to be applied at the master ServSwitch CX.
•“Remote user video compensation” compensates for and CATx cable loss introduced by the cable between the ServSwitch CX remote and the ServSwitch CX. The required video compensation setting does not vary as any “server video compensation” is automatically added as different servers are selected. This only needs to be setup once during installation.
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