This procedure explains how to use a 4100‑series OTDR module in a T‑BERD/MTS‑5800 as an Optical Light Source. When equipped with the light source option, the OTDR can operate as either an OLS or an optical power meter, though not simultaneously. Technicians must use proper fiber cleaning and inspection tools, along with a reference patch cord that matches both the OTDR port and the fiber under test. An optical coupler is used to connect the reference cable to the fiber. The quick card outlines equipment requirements and the steps to configure the module and perform stable, accurate light source operation for fiber testing.

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