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This document addresses the utilization of telecommand packets and telemetry source packets for the purposes of remote monitoring and control of subsystems and payloads. This document does not address mission-specific payload data packets, but the rules contained herein can be extended to suit the requirements of any mission. This document does not address audio and video data as they are not contained within either telecommand or telemetry source packets. This document is structured as follows. Firstly a set of operational concepts is identified, covering all the fundamental requirements for spacecraft monitoring and control during satellite integration, testing and flight operations. A set of services that satisfy these operational concepts is then defined. The detailed specification of these services includes the structure and contents of the associated service requests (telecommand packets) and service reports (telemetry source packets). This document is applicable to any mission, no matter what its domain of application, orbit or ground station coverage characteristics. However, it is not the intention that the PUS is applicable to a given mission in its entirety. The operational concepts and corresponding services contained in this document cover a wide spectrum of operational scenarios and, for a given mission, only a subset of these operational concepts and services is appropriate.