[LinuxPPS] Remote Names & Jitter Spikes

[Nathan Mapes]

Any idea why ntpq -p will return the remote names as follows?

 GPS_NMEA(0)
*GPS_NMEA(0)
oGPS_NMEA(0)
xGPS_NMEA(0)

$ sudo ntpq -p
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
oGPS_NMEA(0)     .GPS.            0 l    8   16  377    0.000    0.013
0.001


I noticed it will go from " " to "*" to "o" within a few minutes.  Stay at
"o" for 30min to an hour then get set to "x" and stay there until I reboot
or restart ntp.  I don't know what the "x" indicates, but I'm thinking it's
not good.  It appears to correlate with a spike in the offset and jitter.
Any insight would be appreciated.

Thanks,

Nathan
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