PON FTTx/MDU OTDR module (FTBx-730C series) — SM3 configuration: 1310/1550/1625 nm OTDR with iOLM capability enabled (OI). Typical dynamic range ~39/38/39 dB. Designed for splitter characterization and PON/MDU troubleshooting; supports live fiber testing and high port-count splitters. See the official EXFO spec sheet (manufacturer) for the full technical table.