Uwe Klein wrote: > > DCF77 for example is a "1 bit/s" transmission, a sentence taking 60s. > It seems to not have issues with ms syncing.
That's because it transmits rather a large number of bits per signalling unit. log2(resolution of timing of edge within second) bits of time information are sent on any long or short signalling unit. (In practice, you won't recover every bit on every measurement, so you need several seconds to improve the signal to noise ratio. Once one is synchronised, the number of useful bits drops greatly, because there is a very high level of redundancy in the coding.) There is nothing in NTP protoco that guarantees that signalling units are second aligned. However, one could get high resolution on very slow links by making the transmit time represent the start of signalling unit time, rather than the time the transmit request was queued. That would require special, low level, drivers. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
