Question: GPS disciplined stratum 1 NTP service with PPS?

[Dan Cross]

On Sun, May 12, 2024 at 10:55 PM Matthew Dillon <dillon at backplane.com> wrote:
> The patch looks good to me!   I'll wait a few days to give you time to burn it in., then push it.

Ok, so this has been running here for several days with no problems.
Time service seems pretty accurate and reliable:

```
chronyc> sources
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
#- NMEA                          0   4   377    18    -11ms[  -11ms] +/-  201ms
#* PPS                           0   4   377    19   -929ns[-1032ns] +/-   57us
^- time-a-g.nist.gov             1  10   377    86   -388us[ -388us] +/-   18ms
^- time-d-wwv.nist.gov           1  10   377   163  -3665us[-3663us] +/-   34ms
^- time-a-b.nist.gov             1  10   377   130  -3622us[-3619us] +/-   36ms
^- 192.5.41.40                   1  10   377   238  -4925us[-4919us] +/-   32ms
chronyc> tracking
Reference ID    : 50505300 (PPS)
Stratum         : 1
Ref time (UTC)  : Wed May 15 14:30:20 2024
System time     : 0.000001024 seconds fast of NTP time
Last offset     : +0.000000829 seconds
RMS offset      : 0.000000944 seconds
Frequency       : 113.819 ppm slow
Residual freq   : +0.000 ppm
Skew            : 0.018 ppm
Root delay      : 0.000100000 seconds
Root dispersion : 0.000019970 seconds
Update interval : 16.2 seconds
Leap status     : Normal
chronyc> sourcestats
Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
==============================================================================
NMEA                       47  20   740     +2.777      4.536  -9056us  2029us
PPS                        51  23   810     +0.000      0.016     +0ns  8361ns
time-a-g.nist.gov          32  17  535m     -0.014      0.167  -3058us  2376us
time-d-wwv.nist.gov        55  26   15h     -0.001      0.066  -2645us  2124us
time-a-b.nist.gov          64  31   18h     -0.028      0.055  -3551us  2322us
192.5.41.40                57  28   16h     -0.012      0.066  -2967us  2483us
chronyc>
```

I think this is ready to push, whenever you get the chance!

        - Dan C.