PTP time synchronization method in networks with large packet delay jitter

Live editing systems in the broadcasting and production industries are increasingly converting to IP based on SMPTE ST2110 and other "Media over IP" standards. In such systems, it is necessary to synchronize with the broadcast station's reference time using PTP (Precision Time Protocol, specified by IEEE 1588). In order to achieve this time synchronization, all network switches along the route must support PTP, i.e., if the network delay jitter becomes large, time synchronization will fail. In this presentation, we propose a method for time synchronization even in networks with large jitter by using adaptive filtering to compute time correction. Furthermore, this method demonstrates that even in networks with significant transmission delay jitter, PTP clock variation can be suppressed, enabling time synchronization via PTP. Consequently, it proves feasible to utilize SMPTE ST2110 for video transmission.