VIII Proactive Testing
Diagnostic testing needs to be part of a routine to keep you out of reactive mode as much as possible. This requires having the proper tools to accomplish the mission.
Different cable testers offer different levels of troubleshooting. For $100 or less, you can get a basic cable tester that will check both coax and UTP cable. More money gets you a TDR (Time Domain Reflectometer). This rather expensive piece of equipment sends a signal, and measures the time it takes to come back. That is translated into distance, with good accuracy. The more accurate, the more you must invest.
A loop back connector crosses the sending and receiving pins on either a serial or RJ connector. Plug it in, and test.
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