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And what exactly would stop them from working if only atomic clocks are

available? At least for a limited time span they would keep in sync

using atomic clocks, and after that they'd still work at reduced

bandwidth.

I agree that GPS is a convenient tool to keep the clocks synched, but

that can be done by other means, too. And you can bet that major

network providers DO have contingency plans in case GPS isn't available.

Juergen Nieveler