[time-nuts] Time in a cave

[Paul]

On Tue, May 12, 2015 at 7:00 PM, Tucek, Joseph <joseph.tucek at hp.com> wrote:
>
> I'm looking for information on non-GPS time sources.
>
> For background, I need to provide PTP


I believe this was "recently" discussed on ntp:questions.  People often
forget dial-up (ACTS) which is supported by the PTP capable Microsemi
SyncServer 3NN models which also have OCXO/TCXO/Rb hold-over options.
EndRun used to make ACTS capable units as well but I believe the current
products are RF only.  If your UTC requirements are sufficiently loose you
can use VoIP as opposed to a "tradition" land-line.