On 2013-07-31, unruh <un...@invalid.ca> wrote: >> Years ago when I used a Thunderbolt to provide a local time reference >> on a Soekris system I found that the PPS pulse was a little too narrow >> to trigger the Soekris UART. I had to use one of these: >> >> http://www.tapr.org/kits_fatpps.html > > And in all those years they still have not figured out what the price > is? The web page says price is TBD. > There used to be a price listed, I think cost was around $40.
> What is the trimble pulse width? Are you sure it is not adjustable? > Remember that such a pulse stretcher adds latency. If you one want it to > 10s of microseconds it is fine. If you are worried about ns it is not. > > (I guess if you are using a serial port you cannot care about better > than 10s of microseconds anyway). > The pulse width wasn't adjustable. It was was just on the ragged edge of what the Soekris UART DCD was able to see for pps kernel discipline. It occasonally missed a pulse and that caused some problems for ntp because it had the time solution from the serial port data, but not the pps timestamp that matched. Tom -- Public Keys: PGP KeyID = 0x5F22FDC1 GnuPG KeyID = 0x620836CF _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions