Time synchronization and time stamping traceability are becoming rapidly a key enabling technology. Accurate time distribution is no more used only in navigation, but is becoming a key element in a large variety of industrial and scientific fields. E.g. telecommunications, mobile 5G technology, power grids, finance and trading, aerospace and research centers rely on accurate timing. Global Navigation Satellite Systems (GNSS) is today the most widespread timing source, although widely known problems such as spoofing, jamming, space weather vulnerability and lack of traceability to Universal Time Coordinated (UTC). Unlike GNSS, commercial telecommunication fiber-optic networks are intrinsically immune to the above mentioned problems and therefore represent a reliable, safer alternative distribution mean for Time and Frequency (TF) reference signal, for all those field that are do not require navigation and mobile devices.
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