The VIAVI range of OTDR and Fiber Characterization modules deliver the most comprehensive range of fiber testers for essential fiber optic test for install, maintenance, troubleshooting and monitoring. Supported by multiple mainframes/platforms covering singlemode and multimode applications they deliver everything from basic fiber certification with automated bi-directional OTDR testing with simple pass/fail information to detailed Fiber Characterization including CD and in-service PMD testing.