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A comment on NIST was 5 μs off UTC after last week's power cut. Parent comment

Re:NIST was 5 μs off UTC after last week's power cut by geerlingguy on Monday December 22, 2025 @03:50PM (#46358894)
A lot of organizations also colocate timing equipment near the actual clocks, and then have 'dark fiber' between their equipment and the main clock signals.

Then they disperse and use the time as needed.

According to jrronimo, they even had one place splice fiber direct between machines because couplers were causing problems! [1]

[1] https://news.ycombinator.com/item?id=46336755

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Re:NIST was 5 μs off UTC after last week's power cut by vasco on Monday December 22, 2025 @03:55PM (#46358950)
If I put my machine near the main clock signal, I have one clock signal to read from. The comment above was asking about how to average across many different clocks, presumably all in different places in the globe? Unless there's one physical location with all of the ones you're averaging, you're close to one and far from all the others so how is it done without the internet?
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