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PTP (IEEE 1588)
Also: IEEE 1588 · gPTP
Definition
Precision Time Protocol — aligns clocks across networked devices, often to below one microsecond with hardware timestamping.
PTP makes clocks agree; it does not make cameras expose together. Combine it with cameras that schedule exposure against the PTP clock or with a local hardware trigger. Useful for multi-device rigs (headset + backpack + wrist units) over Ethernet.