Not sure what is wrong with your network? Before you buy an expensive replacement, test your cables. With this Category 5e continuity tester, you can automatically test cables for shorts, open connections, crossed wire pairs and continuity. This particular multi modular cable tester tests JR45 TIA568A and TIA 568B (AT&T 258A), 10 Base-T, Token ring, RJ-11, RJ-12, USOC and Coaxial BNC cables. Coaxial cable port helps identify cable conditions including shorts, shiled opens and center conductor breaks. Included is the main unit as well as a remote unit, which allows one person testing. Cables are not included, nor is the required 1 9V battery. This tool is extremely helpful in verifying when wiring is correct end to end, when cable isn’t damaged and when the connector isn’t defective. This multi modular cable tester is especially useful if you make your own patch cables and want to test and make sure the wires are correctly assigned. Simply insert the battery, turn the tester on and connect one end of the cable to the main unit and the other end to the remote side. The lights will indicate any red flags, if any, with the wires in the cable. This product is a great investment for anyone participating in installing network connections.