[ntp:questions] Installing more stable oscillator?

Paul.Croome at softwareag.com Paul.Croome at softwareag.com
Fri Jul 13 09:42:27 UTC 2007


Pete,

NTP's mission in life is to discipline a cheap, unstabilized computer
system clock
(quartz oscillator) to one or more better quality, more stable time
sources.
If your computer has a Grade A system clock, you would have to
consider
carefully whether you would make matters better or worse by trying to
discipline it from time sources derived via the Internet.

>Is it possible to have NTP completely ignore the computer's crystal
>oscillator and use an external oscillator?

The computer's crystal oscillator (system clock) is an essential part
of an
NTP server; it's the entity that NTP is controlling. Don't confuse the
external oscillator(s), which NTP uses as its input, and the system
clock,
which is the end result. Using a better-quality, e.g. ovenized, quartz
oscilllator
will give NTP an easier job; but NTP has been designed and engineered
to
cope with the vagaries of typical computers with typical system
clocks.

Yes, it should be possible to use a GPS to number the seconds and
provide
long-term disciplining of a rubidium oscillator, which in turn
provides the PPS
input to NTP.

Paul




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