 How to test the CAT 6 cable? CAT 6 can be tested in a few different ways but there is really only one true option. Firstly a simple continuity tester can be used. This is where the cable is tested and 8 lights confirm if the 8 cores, 4 pairs, have been terminated in the correct order. However, these testers give no feedback about the transmission capabilities of the cable. In addition, you can't tell with these testers the quality of installation and the quality of terminations of the modules and panels. Thus it is imperative all structured cabling should be tested with a cable certification tester. One such tester would be the Fluke DSX. A cable certification tester shows charts highlighting the performance of the cable. In addition, it highlights any effects of poor installation or faulty terminations. Finally, it summarizes if the cable is capable of transmitting as it should. Line charts and calculation tables are given on a single page per cable and a summary of green tick pass or red cross fail is noted.