[ntp:questions] NTP not using PPS

muruganandam d muruganantham_d at hotmail.com
Sun Oct 21 07:43:59 UTC 2007


Sub:NTP not using PPS
 
I am using Kernel :2.6.23rc2PPS patch: ntp -pps-2.6.23rc2.diffNTP version: ntp-4.2.4P4
I have enabled PPS support as a module.Under this I have selected PPS debugging message,UART serial support.
I am using GPS Receiver TRIMBLE ACE 3 .PPS from GPS receiver is fed to MAX232 and output of MAX232 is fed to DCD pin of serial port.The serial port I have used is ttys3.
 
The relevant part of my ntp.conf is
-------------------------------------------------------------
enable stats 
statsdir /var/log
statics loopstats
logconfig = allserver 127.127.8.3 mode 138 prefer iburstfudge 127.127.8.3 refid TSIP  flag3 1 flag2 0 time1 0.042
 
server 127.127.1.0
fudge  127.127.1.0 stratum 10
-------------------------------------------------------------
These are the results after about half an hour:
-------------------------------------------------------------
ntpq -p 
remote          refid   st t when poll reach  delay  offset  jitterxGENERIC(3)  .TSIP. 0  1 39     64  377    0.000 -35.67  35.234
LOCAL(0)      LOCAL(0) 1 20    64   377    0.000  0.000  0.004 
 
-------------------------------------------------------------
ntptime
ntp_gettime() returns code 0 (OK)time CAC57B62.7EC56000,SUN, Oct 21 2007 12:56:43.265, (.265534),maximum error 1061671us, estimated error 2usntp_adjtime() returns code 0 (OK)modes 0x0 (),offset 0.000 us, frequency -0.000 ppm, interval 1 s,maximum error 1121063 us, estimated error 2 us,status 0x1 (PLL),time constant 6, precision 1.000 us, tolerance 512 ppm,
------------------------------------------------------------
Information for generic driver is coming in log file.But no info regarding PPS is coming in log file.
But if I am runing the ppstest file I can see PPS data.
 
What could be the possible reason for PPS not being used?
Please feel free to ask if any more details is required...
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