The 8100 CWDM3E from Viavi Solutions Inc. is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 0.8 m, Attenuation Dead Zone 4.5 m, Optical Wavelength 1431 to 1451 nm, Dynamic Range 42 dB, Pulse Width 3 ns to 20 µs. More details for 8100 CWDM3E can be seen below.