Cat 5 Jack Wiring Diagram - Fault Codes The first thing to do if you're having engine problems is to dump the fault codes from the computer. It's easy to do with a homemade VAG 1115 LED test light.For more info, go to the Diagnostic Fault Codes page. Wandering Idle. VGA Video/Audio Splitter/Extender via CAT5: 4-, 8-, and 16-Port Drive up to 16 monitors and speakers 600 feet away from one computer. Also known as: CAT5 VGA video splitter, video multi-point extender, audio video port expander, cat5 vga splitter, monitor splitter, vga video splitter, extend multiple monitors, VGA video distribution over cat 5 wiring, share video, split vga video, video.