Cable Tester
A hardware tool that verifies whether a cable's wires are correctly connected and continuous.
A cable tester sends a signal through each wire in a copper cable and reports whether every pin-to-pin connection is present, in the correct order, and free of opens or shorts. It verifies continuity and wire map, confirming a cable is terminated to the right standard (T568A or T568B). The key exam distinction is scope: a cable tester confirms whether a fault exists and which pins are affected, while a time-domain reflectometer (TDR) measures the distance to the fault. On the N10-009, it is the correct first step when a newly punched-down patch cable fails to link up.
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