On 2011-05-04, Ken Link <kl...@numberzero.org> wrote: > It appears all I needed to do was swap the TX and CD pins to get it to > start polling and synced to PPS. Thanks! > > Now, a behavioral question. Will PPS be selected as the peer if and > only if the peer marked "preferred" is also synced? What if I want PPS > to act as a supplement to whichever of the stratum 1+ peers NTP sees > available and decides to sync to? PPS will be the only stratum 0 > reference source available to this system, but if the preferred peer > goes down I would expect PPS to continue to correct the jitter of > whichever other peer NTP decides to sync to (that doesn't seem to be > the case). > > Also, it appears that while the preferred peer continues to be synced > and polled every 64 seconds, the PPS peer seems to "toggle" from being > a PPS peer to being rejected nearly every poll (of 16 seconds). Is > this because the polling rate is different between the PPS source and > the other sources, or is my serial cable too jittery? The PPS source > claims to have an offset of +/- 10 ms and a jitter of between 2-3 ms > depending on the poll.
Did you mean usec or do you really mean milliseconds? Not a great PPS source. > > Thanks, > Ken > > On Wed, May 4, 2011 at 2:11 PM, Ken Link <kl...@numberzero.org> wrote: >> Cool program. We've got a physical adapter that does the same thing. >> We're using DB9-to-RJ45 adapters throughout our serial network and it >> appears I'm not using the correct RJ45-to-DB9 adapter to move the PPS >> signal to the DCD pin. I'll post back when I make the right adapter >> and get a chance to test again. >> >> That would probably explain why ntpd is seeing a 413279.091756s offset, huh. >> >> Ken >> >> On Wed, May 4, 2011 at 9:56 AM, David J Taylor >> <david-tay...@blueyonder.co.uk.invalid> wrote: >>> [] >>>> >>>> The problem is we cannot get NTP to sync to the PPS output. The PPS >>>> source shows up in ?ntpq ?p? however it has 0 reach. System B is >>>> synced to System A and is a stable Stratum 2 server at the moment. >>>> MbgMon on System B shows the PPS output on the card is active. The >>>> IRIG signal is 100% and shows it is synced. I?ve installed the >>>> serialpps driver, rebooted and verified it was loaded in the Device >>>> Manager, set the PPSAPI_DLLS global environment variable >>>> appropriately, etc. >>>> >>>> Any suggestions on how to troubleshoot this? >>>> >>>> Thanks, >>>> Ken >>> >>> Ken, Dave Hart is the expert in the PPS on Windows. ?Could I suggest that >>> you at least check that the pulses are being seen by checking with my Serial >>> Port LEDs program? >>> >>> ?http://www.satsignal.eu/software/net.htm#SerialPortLEDs >>> >>> With NTP not running (as only one device can access the COM port), see >>> whether there are brief white flashes on the DCD line. >>> >>> Cheers, >>> David >>> _______________________________________________ >>> questions mailing list >>> questions@lists.ntp.org >>> http://lists.ntp.org/listinfo/questions >>> >> _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions