[ntp:questions] Re: Looking for time sync hardware supported under Linux for under $400?
terje.mathisen at hda.hydro.com
Wed Jan 18 13:41:56 UTC 2006
Tim Keck wrote:
> Richard B. Gilbert wrote:
>> sunblok_$ ntpq -p
>> remote refid st t when poll reach delay offset
>> *GPS_ONCORE(0) .GPS. 0 l 4 16 377 0.000
>> 0.001 0.001
>> There are other GPS receivers that will work quite nicely; one sells
>> for around $85 US. Be certain to get one with a serial (RS-232)
>> interface (the USB interface does not work well in timing
>> applications). Also be certain to get a receiver designed for timing
>> applications. Many GPS receivers are designed for navigation and it
>> is generally not possible for a receiver to do both timing and
>> navigation well.
> Maybe I'm confused, but aren't the delay, offset, and jitter in
> milliseconds, indicating (here) 1 microsecond offset and jitter?
You're right, ntpq works in ms, so this GPS-based ntp server is a
regular member of the us club. :-)
- <Terje.Mathisen at hda.hydro.com>
"almost all programming can be viewed as an exercise in caching"
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