Jeff Geerling • 12/22/2025

NIST was 5 μs off UTC after last week's power cut

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A power cut at NIST's Boulder facility, compounded by a backup generator failure, caused its primary ensemble clock to deviate from Universal Time Coordinated (UTC) by up to 5 microseconds. The article details the incident, explains why the NTP servers were kept online despite the drift, and discusses the implications for systems relying on precise time synchronization.

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#ntp #Network Protocols #Time Synchronization
NIST was 5 μs off UTC after last week's power cut

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