The Spirent Sentinel, now part of VIAVI, is a dedicated synchronization tester supporting 25G, 100G, and 5G over‑the‑air measurements with optional battery operation for field use. It verifies phase, time, and frequency synchronization across 3G, 4G, and 5G mobile networks as well as datacenter, financial, power, and other telecom environments. Sentinel provides a comprehensive measurement suite, including Time Error, Time Interval Error, MTIE, TDEV, and ESMC quality metrics, enabling accurate performance monitoring and fast diagnosis of synchronization issues in modern high‑speed networks.

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