How do you implement precision time synchronization across industrial networks?

Precision time synchronization: IEEE 1588 PTP (Precision Time Protocol) - master clock distributes time to slave devices, sub-microsecond accuracy achievable with hardware timestamping. Implementation: select grandmaster clock (GPS-synchronized for absolute time), configure PTP profile (default or industry-specific), enable PTP in network switches (transparent or boundary clock mode), configure PTP in end devices, and verify synchronization accuracy. Applications: sequence of events recording, synchronized sampling for power quality, and distributed control coordination. Considerations: network topology affects accuracy (switch latency, asymmetric paths), hardware support required for best accuracy, and fallback if GPS lost. NTP is simpler but less accurate (milliseconds). Document time architecture and verify synchronization regularly.