PTP (IEEE 1588)
Beginner
A way for computers on a network to set their clocks to the same time, very exactly.
Novice
The Precision Time Protocol: devices on a network exchange time-stamped messages to work out how far apart their clocks are and how long messages take, then correct their clocks.
Expert
Accuracy depends on time-stamping in hardware close to the cable, symmetric network paths, and switches that correct for their own delay. The standard supports sub-microsecond accuracy, and sub-nanosecond in a properly designed network.
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