QUESTION:
How can one GPS timeserver have accuracy to the microsecond and another only in milliseconds when they use the same GPS satellites?
ANSWER:
GPS receivers are capable of determining the time to an accuracy better than a microsecond. Time transfer by NTP is usually only accurate to one or more milliseconds, due to queuing delay variations in routers, and software response variations at the clients. For this reason some time server designers don't bother to preserve the full accuracy of GPS in the time stamping of the NTP packets. This may make their design approach easier to achieve.
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