[ntp:questions] Re: ntpd/GPS on Sun: newbie questions
Allen McIntosh
mcintosh at nospam.com
Wed Dec 31 23:06:55 UTC 2003
In article <_bednQmjsfyZr26iXTWc-g at speakeasy.net>,
Jonathan <jonathanNOFISH at sprintmail.com> wrote:
>1) Can the xntpd from Solaris 8+patch 109667-05 (v3-5.93e) support NMEA GPS
>receivers? It did not seem to work at all when I tried it; only 4.1.1a
>worked.
If the Solaris xntpd contains the string "NMEA GPS Clock", then yes.
If not, then probably not. (strings xntpd | grep "NMEA")
>2) What NMEA strings are required/supported in (x)ntpd? The Sony chipset
>supports $GPRMC, $GPGGA, $GPGLL, and $GPZDA, which I think some or all are
>supported by (x)ntpd?
It's in the comment at the start of refclock_nmea.c.
>3) Does (x)ntpd rely purely on NMEA data for accurate timekeeping? I saw
>some posts related to people using PPS with GPS units but I'm not sure I
>understand the connection yet.
As I understand it, the timing on NMEA sentences is significantly sloppier
than the PPS signal.
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