On 11/15/2011 22:09, Harlan Stenn wrote:
And you are sure the PPS signal goes away when your NMEA source is no syncd?
I'm not talking about losing sync on the GPS. I'm talking about purposefully ignoring the NMEA data because it has a lot more drift than the other servers so I'd like ntpd to use only PPS plus Internet when the Internet is available. If the Internet ceases to be available, fall back to the NMEA. Obviously if the GPS loses sync at the same time as a loss of the Internet connection then the clock is just going to wander away but would eventually come back when sync/connections are restored.
In my case, I am supplying two different refclocks with the single GPS. The PPS is being fed through a serial port using the PPS refclock (22). The NMEA refclock (20) data is coming from a different serial port with no PPS signal and the clock is not configured to us its own PPS routines.
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