Test your cables. If the wires are broken the tester will detect it. If you make your own patch cables and want to test that the wires are correctly assigned. Test your twisted pair, Straight, Crossover, Cat 5e UTP / STP RJ-11, RJ-12 or RJ-45.
Network Cable Tester 23-N60
Connectors: Category 5, 5e and 6
Use: One network cable tester works with RJ45, RJ11, RJ12, and BNC connections. It quickly and easily checks for cable continuity, miswiring, open, short, straight – through or cross pinning or whether the cable was installed correctly or not.