Thank you for the clarification. On Tue, Apr 14, 2020 at 8:45 PM Richard Cochran <richardcoch...@gmail.com> wrote:
> On Tue, Apr 14, 2020 at 07:34:32PM -0700, Ahmad Byagowi wrote: > > Given the fact that PTP4L makes the adjustments to NIC's oscillator > > frequency and prints the PPB value, what is the NIC card's nominal > > oscillator frequency? I am assuming that is needed in order to convert > the > > PPB values into standard frequency (Hz). > > The frequency of the NIC's internal clock is known only to the driver. > > The ptp4l software doesn't know or care about that, because the kernel > interface allows adjusting the clock rate in terms of parts per > million (with a 16 bit fractional part). > > The driver converts the dialed PPM value into whatever adjustment is > needed by the hardware. > > Thanks, > Richard > -- 73 With best wishes / Mit herzlichsten Grüßen Ahmad Byagowi, Ph.D., Dr. Techn., P.Eng. Phone: +1 (650) 924 6653 [image: 🌎] Please consider the environment before printing this e-mail.
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