[ntp:questions] offline machines' time synchronization

Dave Hart hart at ntp.org
Thu May 24 18:53:27 UTC 2012

On Thu, May 24, 2012 at 4:24 PM, Chris Albertson
<albertson.chris at gmail.com> wrote:
> Lots of good discussion here but I found an easy way to stay "on-time"
> while the Internet is down and GPS is not available.  There are some
> people on eBay selling Rubinium oscillators for about $40.  They have
> a pulse per second output.    These Rb clocks will keep NTP within
> reasonable specs for a LONG time.  It does required some effort to set
> up.  Just wanted to point out one more option.

ntpd requires reference clocks provide time, not just frequency.  How
do you discipline the Rb PPS to occur at the top of the UTC second (or
a fixed offset from the top)?

Dave Hart

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