David Woolley wrote: [] > The problem with USB latency is that it is unpredictable. The > uncertainty in the direct serial port latency is 1/16 th of the > signalling unit length (about 6 microseconds at 9600) plus the > uncertainty in the interrupt and process scheduling latencies. (If > the UART clock is free running on the GPS device, you might need to > add another 1/16th, so about 12 microseconds.)
Thanks, David. As NTP deals well with the unpredictable latency on the internet, it's not impossible that a USB/GPS device could produce significantly better results than a consumer internet connection alone. I'd like to see actual NTP results. Cheers, David _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
