David Woolley <[EMAIL PROTECTED]> writes: >Hal Murray wrote: >>> There is nothing per se that makes this system impossible to deliver 1ms. >>> Of course it depends of where those clients are-- if they are at the bottom >>> of the sea communicating with 1bd/sec ultralow frequency radio, you will >>> not get 1ms precision. >> >> What's wrong with a (very) slow link? As long as there aren't any >> queueing delays, the delay should be symmetric in both directions >> and I'd expect ntpd to work OK.
>A one baud link would have an uncertainty of a second in the time, >unless the transmit time stamps were synchronised with the signalling >units. It would also have a delay that was on the limits of causing >rejection for a normal NTP implementation. >A 1 bit/second link would definitely have an unacceptable delay. >A 1 baud/second link would have a continually varying latency, and, >unless the bits per signalling unit varied to compensate, a continually >varying delay. I don't think baud/second was the intended unit. I >suspect he was suggesting a 1 bit per signalling unit, 1 signalling unit >per second, case. Nope, 1 bit per sec as an off the top of my head estimate of the rate for an ultra longwavelength radio link with a submarine under the ocean. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
