Viavi 4100-Series CWDM OTDR Modules for T-Berd/MTS-2000, -4000, -5800 Platforms

VIAVI CWDM OTDR solution enables cable operators, dark fiber providers and telecommunication service providers to test through MUX/DEMUX and perform a complete end-to-end link characterization or troubleshooting of active C-RAN, DAS and mobile fronthaul CWDM networks.


  • The most compact CWDM OTDR solution in the market: 18 CWDM wavelengths covered in only 2 OTDR modules
  • Perfect for end-to-end link characterization during network deployment/ construction
  • Ideal to test new CWDM wavelength routes or pinpoint faults and know their exact locations without disrupting traffic on active channels
  • Can be combined with a CWDM spectrum analyzer module (COSA-4055) to measure the wavelengths and power levels of active CWDM channels


  • Characterize end-to-end links with exact CWDM wavelengths
  • Troubleshoot active networks with in-service testing capability
  • Verify end-to-end continuity with the continuous wave source function

Key Features

  • CWDM8U version includes 8 wavelengths from 1471nm to 1611nm
  • CWDM10U version includes 10 wavelengths from 1431nm to 1611nm
  • CWDM10L version includes 10 wavelengths from 1271nm to 1451nm
  • Integrated CW light source with modulation capability (same OTDR wavelengths)
  • Eliminate OTDR interpretation errors with Smart Link Mapper (SLM) option (converts the OTDR trace into icons – splice, connector, MUX/DEMUX)
  • Compatible with T-BERD/MTS-2000, -4000, -4000 V2 and -5800 platforms