This standard specifies the requirements of Phasor Data Concentrators (PDCs) for power systems. It includes requirements for: a) Data aggregation b) Processing of synchrophasors and other synchronized data c) Data interfaces with other systems d) Handling of commands@ configuration@ and other meta-data e) Performance@ including latency@ environmental@ throughput f) Testing Purpose The purpose is to improve interoperability of devices@ systems and applications that use synchrophasors and other synchronized data by standardizing requirements for PDCs.