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The Viavi FTH-5000 is a fiber test head that, when combined with the VIAVI ONMSi Optical Network Management System, provides automated, remote monitoring of optical fiber networks. The FTH-5000 uses a combination of optical time-domain reflectometry (OTDR) and optical-switch technology to continuously test multiple fibers for faults, damage, and network health. It is used by service providers and data centers for applications like FTTx deployments, data center interconnect testing, and critical infrastructure monitoring.