RCDD Question #156: Real Exam Question with Answer & Explanation

The correct answer is D. Time domain reflectometer (TDR). A Time Domain Reflectometer (TDR) is the best tool for diagnosing high return loss because it identifies the precise physical location of impedance mismatches causing signal reflections on a copper cable.

Question

You have been asked to test and troubleshoot an installed base of cabling that is believed to be causing network problems. You are finding that there are high levels of return loss upon initial testing. What testing will best determine the reasons for these failures?

Options

APower meter
BContinuity testing
CLevel II testing
DTime domain reflectometer (TDR)

Explanation

A Time Domain Reflectometer (TDR) is the best tool for diagnosing high return loss because it identifies the precise physical location of impedance mismatches causing signal reflections on a copper cable.

Common mistakes.

A. A power meter measures received optical power levels and is used exclusively for fiber optic link testing, not for diagnosing impedance-related faults on copper cabling.
B. Continuity testing only confirms whether a conductive electrical path exists end-to-end and provides no information about impedance mismatches or the quality of the signal path.
C. Level II testing refers to OTDR-based optical fiber certification testing and is not applicable to copper cable return loss diagnostics.

Concept tested. TDR diagnosis of copper cable return loss faults

Reference. https://www.flukenetworks.com/knowledge-base/application-guides/copper-cable-testing

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