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This International Standard specifies the requirements for packet telemetry services in space data and information transfer systems. The purpose of this document is to establish common requirements for the services provided between protocol layers of the space to ground link. It does not define the extension of these services across distributed components of the spacecraft or ground data systems. The scope and field of application are furthermore detailed in subclauses 1.2 and 1.3 of the enclosed CCSDS publication.