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FTB-7400E Metro/CWDM OTDR is a high resolution OTDR covering longer metor distances and ITU based CWDM networks. It features an industry leading linerity of + or - 0.03 dB/dB, up to 256,000 sampling points, an event dead zone of 0.8 m and attenuation dead zone of 4 m, dynamic range of up to 42dB for long haul test and it tests through CWDM based multiplexers and demultiplexers at ITU recommnded wavelengths.