My guess is that the error is real and coming from the TS2100. The TS2100 was (is) a SNTP server running a RTOS but the timestamps are done at the application layer. If you look at the output 1pps of the TS2100, my guess is that it will probably agree with your other devices within a few microseconds. I don't recall doing anything in that device to compensate for the asymmetries in the transmit and receive paths. If you only use the device for ntp service, you can use the pdelay (antenna propagation delay) setting to bias the server clock to generate messages on time.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jason Rabel Sent: Monday, November 01, 2010 9:06 AM To: [email protected] Subject: [time-nuts] Minor NTP Issue? I hope this doesn't get mangled too much via email... Below is an output of "ntpq -p" on one machine. remote refid st t when poll reach delay offset jitter ======================================================================== ====== *NET4501-1 .GPS. 1 u 36 64 377 0.724 0.022 0.100 +NET4501-2 .GPS. 1 u 22 64 377 0.801 0.038 0.132 +PRAECIS .GPS. 1 u 14 64 377 0.740 0.097 0.034 -TS2100-1 .GPS. 1 u 50 64 377 4.995 -0.362 0.030 -TS2100-2 .GPS. 1 u 17 64 377 4.966 -0.331 0.035 My two TS2100's always seem to be slightly "off" compared to my other time servers... Even after I've had to power cycle all my equipment. Four of the five devices are currently on the same GPS antenna and have more or less the same length of cable. Same four go to the same switch and such. Does a negative offset mean it is in the future? If so, I'm guessing I need to dig and find an offset for cable delay (or similar) in the TS2100? I seem to recall that the standard package came with 50' or 150' of cable, but even that pre-factored delay wouldn't equate to ~300-400us would it? _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
