On Fri, Jul 22, 2011 at 2:48 PM, Javier Herrero <[email protected]> wrote: > El 22/07/2011 20:39, michael taylor escribió: >> >> >> I think all NTP server appliances have this functionality by their >> nature, whether or not the oscillator is of particular high quality >> (low noise) or not. Many of the low-end ones likely just use a >> standard oscillator "in a can" [2] that the embedded processor uses. > > No, ntp algorithm does not adjust the oscillator itself.
Yes, while the NTP algorithm or protocol does not adjust the oscillator (or RTC) hardware directly, it does pass trimming or de-skewing recommendations via software (ntp_adjtime, adjustime, or hardpps) to OS, allowing the OS to adjust its system's clock. But in the case of a NTP appliance (or embedded device), having intimate knowledge of a single design means that the appliance's Operating System could implement ntp_adjustime or hardpps to a VCO (voltage controlled oscillator) via a DAC, a DDS or similar, to actually fine time the device's master oscillator. Which becomes worthwhile if there is an high quality oscillator driving (or steering) the computer hardware's system clock, such as an OCXO or Rubidium oscillator. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
