What is the primary role of a Time Domain Reflectometer (TDR)?

The primary role of a Time Domain Reflectometer (TDR) is to identify faults in cabling by sending pulses and measuring reflections. This instrument operates by transmitting a short pulse of electrical energy down a cable and then analyzing the reflections that return. If there is a fault, such as a break or short circuit in the cable, the reflected signals will differ from those of a healthy cable. The TDR measures the time it takes for the reflections to return, which allows it to pinpoint the location of the fault with high accuracy. This capability is especially valuable in maintaining network integrity by quickly and effectively diagnosing issues in cabling systems.

The other options describe functions that are not related to the primary use of a TDR. Amplifying data signals, measuring network bandwidth, and enhancing security for data transmission are all essential tasks in telecommunications and networking, but they fall under different tools and technologies rather than the scope of a TDR.