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[questions] Re: GPS+PPS vs NTP server, why a huge offset ?



On 17/06/2022 16:34, chris wrote:
As for compatibility, while a mismatched connection may work, it's bad
practice to do that, where you are dealing with microsecond timing
and want to avoid jitter. Use the correct interfaces and do the job
right, then you can fit and forget:-)...

RS232 isn't optimal for PPS as it is slew rate limited to 30V/µs, which means it will take at least 0.5µs from a resting level until it has fully cleared the transition region, if implemented to standard.

TTL is the more natural logic family for high accuracy PPS.

GPS should be able of achieving time transfer accuracies of better than .03µs.
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