nanog mailing list archives

Re: anyone running GPS clocks in Southeastern Georgia?


From: Jay Ashworth <jra () baylink com>
Date: Sun, 23 Jan 2011 17:58:06 -0500 (EST)

----- Original Message -----
From: "Gary Buhrmaster" <gary.buhrmaster () gmail com>

Most of the "brand name" GPS NTP solutions have a clock
with is more than stable enough to survive without GPS
lock for 45 minutes(*). Some of the more expensive units with
temperature controlled oscillators have hold times in the
many weeks. My guess is that the NTP ripples will be
limited to those NTP servers just (or recently) booted
which have not yet achieved a stable clock state.

Do such clocks reduce their advertised stratum when doing so? 

Or are they always considered "GPS-steered", and therefore there's no
meaningful change short-term?
-- jra


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