Hacker News new | ask | show | jobs
by sneak 387 days ago
How do SCIFs do time? Do they use optoisolated network connections and then do time sync over that? (SIPRnet, is it?)
2 comments
signal-intel 387 days ago
The US Navy maintains NTP servers on a variety of networks, the public internet and SIPR included.

https://www.cnmoc.usff.navy.mil/Our-Commands/United-States-N...

link
offmycloud 387 days ago
If you have a special project need, you might be able to get one-way IRIG time signal on fiber with guard boxes at both ends. There's really no technical reason why you couldn't do analog GPS baseband over fiber, but you do need approved equipment at both ends for policy reasons. (certified for no backflow)
link