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The "User/User" Reference

While it is normally not required, it is possible for you as the "User" to override the System Time (even if it is synchronized to a valid reference) with a manually set time, steered by an undisciplined oscillator, and use this manually set Time as an output reference. This concept is referred to as the User/User reference, because both the Time, and the 1PPS reference are not linked to any UTC-based external reference, but hand-set by you.

Caution: Since the User/User reference is not traceable to a valid reference, it does not qualify as a legitimate time source. Operating NetClock with a manually set User time bears the risk of inadvertently outputting an illegitimate System Time thought to be a valid reference time.