The DWDM OTDR Module (4100‑Series) is a compact xWDM test solution for T‑BERD/MTS‑2000, ‑4000 V2, ‑5800, CellAdvisor 5G, and OneAdvisor 800 platforms. As xWDM adoption grows in access networks, this module enables full end‑to‑end characterization and troubleshooting of DWDM and hybrid CWDM/DWDM links using precise C‑band wavelengths. It supports in‑service testing through MUX and common test ports and verifies continuity across MUX/DEMUX and ROADMs using a continuous‑wave source. Lightweight and comprehensive, it helps cable, wireless, and telco operators efficiently maintain high‑capacity optical networks.

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