[ntp:questions] Driver Help?

Richard B. Gilbert rgilbert88 at comcast.net
Tue Jun 12 23:38:38 UTC 2007


Karl Denninger wrote:
> I'm hacking a copy of the NMEA driver to work with the CDMA modems 
> (which provide a clock signal even if not subscribed - kinda 
> interesting) and have it talking to the device.
> 
> But - even though the dispersion looks reasonable and so does jitter, 
> the application refuses to consider it "synced".
> 
> I have the following.....
> 
> ntpdc> sysi
> system peer:          CDMA(0)
> system peer mode:     client
> leap indicator:       11
> stratum:              16
> precision:            -19
> root distance:        0.00000 s
> root dispersion:      0.00165 s
> reference ID:         [67.68.77.0]
> reference time:       00000000.00000000  Thu, Feb  7 2036  0:28:16.000
> system flags:         auth monitor ntp kernel stats
> jitter:               0.001129 s
> stability:            0.000 ppm
> broadcastdelay:       0.003998 s
> authdelay:            0.000000 s
> ntpdc> peer
>     remote           local      st poll reach  delay   offset    disp
> =======================================================================
> *CDMA(0)         127.0.0.1        0   16  377 0.00000  0.241065 0.00697
> ntpdc>
> 
> Obviously, I'm missing SOMETHING....... the dispersion looks reasonable, 
> but it will not lock up on the clock.  Any idea where I start?

I think you may be missing the "*" in column one above.  That indicates 
that ntpd has your CDMA(0) clock as the synchronization source.

The offset looks a little high unless ntdp was started quite recently. 
Bear in mind that ntpd needs time to beat your clock into submission. 
Thirty minutes is a good length of time to wait before taking offset and 
dispersion figures seriously.




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