[ntp:questions] Assistance with PPS on Windows

David J Taylor david-taylor at blueyonder.co.uk.invalid
Wed May 4 14:56:29 UTC 2011

> 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?


With NTP not running (as only one device can access the COM port), see 
whether there are brief white flashes on the DCD line.


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