This procedure explains how to use a 4100‑series OTDR module in a T‑BERD/MTS‑5800 as an Optical Power Meter to measure optical insertion loss. When equipped with the proper software and the optional power meter feature, the OTDR can function as either an OPM or a light source, though not simultaneously. Technicians must use proper cleaning and inspection tools along with a reference cable that matches the OTDR port and the fiber under test. The quick card outlines required equipment and the steps for configuring the module, performing measurements, and ensuring accurate insertion loss results.

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