ADDER CATx User Manual

Also see for AdderView CATx AVX4016: User guide

Contents

ADDER CATx User Manual Manual pdf 31 page image

 30Remote user skew adjustmentThe category 5, 5e and 6 cabling supported by the AdderView CATx consists offour pairs of wires per cable. Three of these pairs are used to convey red, greenand blue video signals to the remote video monitor. Due to the slight difference intwist rate between these three pairs, thered, green and blue video signals may notarrive at precisely the same time. This isvisible as separate colour shadows on highcontrast screen images and is particularlyapparent when using higher screenresolutions and some types of category 5ecables.To alleviate this situation, the AdderX100AS/R module provides internal skewadjustment that can help to rectify thesituation. The skew adjustment works bydelaying or advancing the timing of anyof the red, green or blue colour signals sothat they are all delivered to the monitorat precisely the same time. For best results, the “skew” program supplied onthe disk or downloadable from www.adder.com or www.adder.info is themost accurate way of setting skew as the red, green and blue lines are renderedexactly on the screen as single pixel wide lines. The skew.bmp test pattern canalso be used but it is less accurate. Alternatively, you can create your own skewpattern using a standard image creation package, as detailed opposite.Convergence testpattern showing theRGB crosses. In thiscase, the green signalcan be seen out ofline with the othertwo colours.1 2 3 4 5 6 7 886528652Data signalRedvideo signalGreenvideo signalBluevideo signal73417341To use skew adjustment1 Display a skew pattern on the appropriate computer. You can either use thesupplied skew pattern or create your own:Using the supplied skew patterni Insert the supplied Adder Installation CD-ROM into the CD player of thecomputer.ii Within Windows, use the My Computeroption (usually available as a desktop iconor within the Start menu) to view thecontents of the CD-ROM. Double-clickthe Skew entry to display the standardtest pattern. If necessary, maximise theapplication window so that the image fillsthe screen.The screen will show a series of fine red,green and blue crosses which should all bein line, vertically and horizontally. Skew affects the horizontal placement ofthe colours and using this pattern it is much easier to discover which, if any,colours are being adversely affected by the cable link.Creating a skew test patterni Run any image creation/editing application, such as the Paint programsupplied with Windows.ii Using the image application create threestacked horizontal rectangles (one red,one green and one blue) that fill thewidth of the screen.iii Draw a vertical black line down acrossthe coloured bars and then repeat thisvertical line at intervals along the widthof the coloured bars. These lines createbreaks across the colours and give youmore opportunities to view the horizontalposition of each colour relative to the others.2 On the remote user keyboard (connected to an Adder X100AS/R extender),simultaneously, press the hotkeys (by default, and ) along with toenter configuration mode.The three keyboard indicators (‘Num Lock’,‘Caps Lock’ and ‘Scroll Lock’) will now beginto flash in sequence.