ADDER CATx User Manual

Also see for AdderView CATx AVX4016: User guide

Contents

ADDER CATx User Manual Manual pdf 28 page image

 27Video compensationThe 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 (980feet). Such long cable lengths can affect video signals, especially when higherscreen resolutions are used. In order to eliminate any video signal degradation,all AdderView CATx units and accompanying Adder X100 extenders provideeffective software-based video compensation features.Two main types of video compensation are provided within the AdderView CATxinstallation, these are:• Computer video compensation - operates on video signals between eachcomputer system and the AdderView CATx unit. See Computer videocompensation.• Remote user video compensation - operates on video signals betweeneach remote user(s) and the AdderView CATx unit. See Remote user videocompensation 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 computeror remote user link. During operation, control of video compensation is fullyautomatic. Please take into account the following when configuring links:• The AdderView CATx stores a video compensation setting for eachcomputer which defines the level of compensation that is applied wheneverthe computer is selected. This “computer video compensation” settingis to correct for any video clarity loss due to the CATx cable between theAdderView CATx unit and the computer’s CAM.• CATx cables below 10m give very little loss and so it is not normallynecessary to be concerned about setting any computer video compensationif short CATx cables are being used between the AdderView CATx and theCAM for each computer.• “Computer video compensation” may be setup by typing in the cabledistance in the OSD or, if very fine video adjustment is desired, by observingthe video picture on the local (user 1) port whilst making adjustments.• If a cascade of switches is being used, computer video compensation onlyneeds to be applied at the master AdderView CATx.• “Remote user video compensation” compensates for and CATx cable lossintroduced by the cable between the X100 and the AdderView CATx. Therequired video compensation setting does not vary as any “computer videocompensation” is automatically added as different computers are selected.This only needs to be setup once during installation.Note: For installations where both computers and remote users require videocompensation, always ensure that the computers are compensated first.• A third type of video compensation is provided by Adder X100AS/R extendermodules only. This type of compensation is called Skew adjustment andcombats the effect of uneven twisted pairs within link cables.See Remote user skew adjustment for details.