Fluke Networks leads the way in responding to TSB140��s and ISO/IEC 14763-3 (2006) two tier certification of installed fibers with loss/ length (Tier 1/Basic) measurements and requirement for OTDR trace (Tier 2/Extended). Our DTX Fiber Test Modules and DTX CertiFiber automate Tier 1 certification, and both DTX and OptiFiber integrate Tier 1 and Tier 2 support. Fluke Networks�� two-tier testing gives installers a complete picture of their fiber installation, while giving network owners proof of a quality installation.