Synchronization clocks for Synchro-phasors (IEEE C37.118, IEC 61850) Synchro-phasors measured all over the network requires the network-wide distribution of precise synchronization signal. OSA 5401 Syncplug Our OSA 5401 Syncplug™ is a highly accurate and uniquely effi cient small form-factor pluggable (SFP) grandmaster clock