[LinuxPPS] Synchronizing a ZDA message with NTP using linuxPPS

[Divi.Oillo at ifremer.fr]

Hi,

Here is my new ntp.conf (NMEA disabled)

------------------------------------------------------------
#Undisciplined Local Clock
#server 127.127.1.0
#fudge 127.127.1.0 stratum 15

#Generic NMEA GPS Receiver
#server 127.127.20.0 mode 8 minpoll 4 maxpoll 16 prefer
#fudge 127.127.20.0 flag1 1 flag2 1 flag3 1

#PPS Clock Discipline
server 127.127.22.0 minpoll 4 maxpoll 16
fudge 127.127.22.0 flag2 1 flag3 1

#134.246.11.121
server ntpserver
-------------------------------------------------------------

techsas:~> ntpq -pn
      remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
o127.127.22.0    .PPS.            0 l    3   16  377    0.000    4.857   3.259
*134.246.11.121  .1PPS.           1 u    2   16  377    0.161    3.268   2.389
techsas:~> ntpq -pn
      remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
o127.127.22.0    .PPS.            0 l   15   16  377    0.000    4.355   1.906
*134.246.11.121  .1PPS.           1 u   14   16  377    0.161    3.268   1.068
techsas:~> ntpq -pn
      remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
x127.127.22.0    .PPS.            0 l    5   16  377    0.000    3.984   1.264
x134.246.11.121  .1PPS.           1 u    4   16  377    0.158    2.265   1.004
techsas:~> ntpq -pn
      remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
o127.127.22.0    .PPS.            0 l    6   16  377    0.000    6.219   1.816
*134.246.11.121  .1PPS.           1 u    5   16  377    0.142    4.453   1.881

-------------------------------------------------------------

It seems that ntpserver works with our PPS signal ('o' instead of 'x')  
but sometimes the status of the remote server changes, is that normal?

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