While analyzing an OTDR trace of a newly installed 5km single-mode link, you see a sharp spike upwards followed by a drop in the trace level. What physical event does this signature represent?
Answers
AA non-reflective event, such as a perfect fusion splice
BA reflective event with loss, such as a mechanical splice or connector
CA ghost reflection from the launch cable
DA macrobend in the fiber
Correct answer: B — A reflective event with loss, such as a mechanical splice or connector
A sharp spike indicates reflectance (Fresnel reflection), and the subsequent drop indicates insertion loss. This is the classic signature of a mated connector pair or mechanical splice.
MIFOTRA exam practicealigned to TIA-568.3-D / ITU-T G.652·3 marks·Medium