[ntp:questions] Second attempt at GPS-18 based NTP server
Duncan, Paul A.
pdu at noc.ac.uk
Fri Feb 10 14:23:38 UTC 2012
Okay, everyone has said I definitely need to use a custom kernel, and I have now done that, and ntpdc -c kern now reports the following:
pll offset: -1.091e-06 s
pll frequency: -3.196 ppm
maximum error: 0.019912 s
estimated error: 1e-06 s
status: 2107 pll ppsfreq ppstime ppssignal nano
pll time constant: 7
precision: 1e-09 s
frequency tolerance: 496 ppm
pps frequency: -3.196 ppm
pps stability: 0.022 ppm
pps jitter: 1.261e-06 s
calibration interval: 128 s
calibration cycles: 797
jitter exceeded: 522
stability exceeded: 0
calibration errors: 5
Which looks fairly reasonable, as the status line is talking about ppstime and ppssignal. Not sure about 5 calibration errors...
But then I look at ntpq -p and it says this:
remote refid st t when poll reach delay offset jitter
+server1.terrybu 126.96.36.199 2 u 70 128 377 6.356 -0.122 13.187
-188.8.131.52 184.108.40.206 2 u 70 128 377 5.441 -0.582 13.929
+gamma.h3x.no 220.127.116.11 3 u 1 128 377 6.066 -0.228 0.660
*GPS_NMEA(0) .PPS. 0 l 2 64 377 0.000 -0.001 0.001
I'm fairly sure that there should be a lower case "o" to the left of GPS_NMEA, and there is not.
Am I right to be worried?
This message (and any attachments) is for the recipient only. NERC
is subject to the Freedom of Information Act 2000 and the contents
of this email and any reply you make may be disclosed by NERC unless
it is exempt from release under the Act. Any material supplied to
NERC may be stored in an electronic records management system.
More information about the questions