[Pool] Isolated NTP Server vs. Adding Stratum 1 Servers

Alby alby at empire.org
Mon Mar 7 21:20:32 UTC 2011



 I have been able to get my Garmin GPS "18x" LVC working, but only if
no other NTP servers are listed in the ntp.conf file.  If I even think
of sticking 1 server in their, the GPS_NMEA will show up as a falsetick.
I assume this isn't normal. Any suggestions on a possible resolution?


With no servers:


     remote           refid      st t when poll reach   delay   offset 
jitter
==============================================================================
*GPS_NMEA(0)     .GPS.            0 l   36   64  377    0.000    0.823  
8.207



With servers:

     remote           refid      st t when poll reach   delay   offset 
jitter
==============================================================================
*time.nist.gov   .ACTS.           1 u   47   64  377   58.103    3.139  
0.862
-ntp-nasa.arc.na .GPS.            1 u   34   64  377   91.125   11.730  
0.760
-tick.usask.ca   .GPS.            1 u   13   64  377   87.823   15.571  
5.620
-ntp.alaska.edu  .GPS.            1 u    5   64  337  138.379   12.184  
5.381
+timekeeper.isi. .GPS.            1 u   15   64  377   91.532    5.529  
6.093
+ntp2.usno.navy. .USNO.           1 u   17   64  377   70.567    3.838  
5.091
xGPS_NMEA(0)     .GPS.            0 l    2   64  227    0.000  -270.34 
83.468







  Here are some various bits of data:
-----------------------------------------------
root at godzilla:/usr/src/pps-tools# ./ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1299531731.995245546, sequence: 1719 - clear 
1299530044.098005776, sequence: 31
source 0 - assert 1299531732.995242271, sequence: 1720 - clear 
1299530044.098005776, sequence: 31
source 0 - assert 1299531733.995245717, sequence: 1721 - clear 
1299530044.098005776, sequence: 31
source 0 - assert 1299531734.995240085, sequence: 1722 - clear 
1299530044.098005776, sequence: 31
source 0 - assert 1299531735.995234574, sequence: 1723 - clear 
1299530044.098005776, sequence: 31
^C


root at godzilla:/usr/src/pps-tools# gpspipe -r
netlib_connectsock() returns socket on fd 3
{"class":"VERSION","release":"2.95","rev":"2010-11-16T19:40:47","proto_major":3,"proto_minor":3}
{"class":"DEVICES","devices":[{"class":"DEVICE","path":"/dev/ttyS0"}]}
{"class":"WATCH","enable":true,"json":false,"nmea":true,"raw":0,"scaled":false,"timing":false}
$GPRMC,210257,A,3903.1147,N,07729.1113,W,000.0,000.0,070311,010.5,W*76
$GPGGA,210257,3903.1147,N,07729.1113,W,2,07,1.1,113.9,M,-33.8,M,,*7B
$GPGSA,A,3,09,11,14,18,22,24,,31,,,,,1.9,1.1,1.6*3C
$GPGSV,3,1,11,09,16,045,27,11,09,309,24,14,66,335,42,18,42,139,29*7D
$GPGSV,3,2,11,22,77,154,38,24,12,319,27,25,36,125,20,31,35,223,51*7D
$GPGSV,3,3,11,12,31,073,00,27,03,045,00,32,02,313,00*49
$GPRMC,210258,A,3903.1147,N,07729.1113,W,000.0,000.0,070311,010.5,W*79
$GPGGA,210258,3903.1147,N,07729.1113,W,2,08,1.0,113.9,M,-33.8,M,,*7A
$GPGSV,3,1,11,09,16,045,28,11,09,309,24,14,66,335,42,18,42,139,28*73
$GPGSV,3,2,11,22,77,154,38,24,12,319,27,25,36,125,20,31,35,223,51*7D
$GPGSV,3,3,11,12,31,073,00,27,03,045,00,32,02,313,00*49
$GPRMC,210259,A,3903.1147,N,07729.1114,W,000.0,000.0,070311,010.5,W*7F
$GPGGA,210259,3903.1147,N,07729.1114,W,2,08,1.0,113.9,M,-33.8,M,,*7C
$GPGSA,A,3,09,11,14,18,22,24,25,31,,,,,1.8,1.0,1.5*38
$GPGSV,3,2,11,22,77,154,38,24,12,319,27,25,36,125,20,31,35,223,51*7D










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