scope:

This document describes SCCS architecture in terms of the following:

- definitions of all key elements, on ground and in space, that are involved in space communications;

- definitions of concepts that characterize SCCS services;

- requirements on system elements and components that provide secure SCCS services;

- recommended protocol stack configurations for each element type; and

- recommended end-to-end system configurations to provide interoperable and crosssupportable space communications services.

This document does not specify:

− the details of how to implement systems that provide SCCS services;

− explicit technologies needed to implement SCCS services;

− application or mission operations protocols except for those used for data transfer;

− mission operations except for those involved in planning, scheduling, and executing space communications;

− spacecraft onboard cross support, except for space communication services.

PURPOSE

The purpose of this Recommended Practice is to define a set of requirements for CCSDSrecommended configurations for secure Space Communications Cross Support (SCCS) architectures. This architecture is to be used as a common framework when CCSDS Agencies 1) provide and use SCCS services, and 2) develop systems that provide interoperable SCCS services. These SCCS services include both elements on the ground and elements in space. These services cover both single-hop, space Data Link Layer services (Mission Operations Center [MOC]-to-spacecraft), and Solar System Internet (SSI), multihop, Network Layer services that involve data routing and internetworking using multiple space assets.

NOTE - The term 'agency' is used in CCSDS, but users of CCSDS cross support concepts include satellite operators and service providers, and the context of the cross support is not limited to a user/provider interface with an agency.

This Space Communications Cross Support-Architecture Requirements Document (SCCSARD) provides normative specifications and definitions; its companion Space Communications Cross Support-Architecture Description Document (SCCS-ADD) (reference [D5]) provides the descriptive information, explanatory materials, and other graphical representations that support the understanding of these requirements.