RCDD · Question #154
When balanced twisted-pair copper cabling, return loss is a measurement of the:
The correct answer is B. Reflection of signal power resulting from the insertion of a device in a transmission line (in dB). Return loss on balanced twisted-pair copper cabling measures the reflected signal power caused by impedance discontinuities when a device is inserted in a transmission line, expressed in dB.
Question
When balanced twisted-pair copper cabling, return loss is a measurement of the:
Options
- AWorst case difference in magnitude between the expected insertion loss and the actual measured
- BReflection of signal power resulting from the insertion of a device in a transmission line (in dB)
- CSignal coupling between any two pairs along the entire length of the cabling
- DLoss in signal resulting from the insertion of a component, of link, or channel, between a transmitter
- ETime required for a signal to travel from one end of the transmission path to the other end
How the community answered
(14 responses)- A7% (1)
- B86% (12)
- E7% (1)
Why each option
Return loss on balanced twisted-pair copper cabling measures the reflected signal power caused by impedance discontinuities when a device is inserted in a transmission line, expressed in dB.
The difference between expected and actual insertion loss describes insertion loss measurement uncertainty or deviation, which is a separate concept from return loss.
Return loss quantifies how much signal is reflected back toward the source due to impedance mismatches at termination points or along the cable. It is measured in dB and is a key TIA-568 copper channel performance parameter, directly affecting high-speed network signal integrity by indicating how well the cabling maintains consistent impedance throughout its length.
Signal coupling between pairs describes NEXT (Near-End Crosstalk) or alien crosstalk, not reflected signal power.
Loss in signal resulting from inserting a component is the definition of insertion loss, a distinct and separately measured parameter.
Time for a signal to travel from one end to the other is propagation delay, an unrelated timing-based parameter.
Concept tested: Return loss definition on copper twisted-pair cabling
Source: https://www.tiaonline.org/standard/tia-568-2-d/
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