​The CSS area addresses how the services of an agency’s TTC network are made available to another agency’s mission spacecraft. This includes addressing data transfer services and their management. The data transfer services involve both space link (to/from TTC network ground station to mission spacecraft) and terrestrial link (to/from TTC network ground station to the mission ground data system). The space link data transfer encoding/protocol schemes are subject to the SLS area and are not defined by the CSS area. The terrestrial data transfer services, with regard to transfer mission data and observations such as ground station tracking data, are addressed by the CSS area. The management of both the space link and data transfer services is also addressed by the CSS area. Proper definitions of the services and management of these services depends on a reference architecture definition and also agreed, internationally recognized terms for the functional components of this architecture. The terrestrial data transfer services and management data format definitions may be inc​​orporated into mission operations end-to-end recommendations of the MOIMS area. The strategic goals of the CSS area are presented below.​


​Define and maintain a reference architecture such that it is clear how the various (there are many) cross support standards are best organized, and that it provides guidance as to the requirements for putting these various standards together for achieving interagency cross support. Such an architecture needs to consider, for example, that a service such as telemetry is in fact composed of three major sub-services: space link data transfer, terrestrial data transfer, and off-line data maintenance. This architecture therefore addresses how the various standards involved are connected and further addresses the managements of these types of services (e.g., telemetry, telecommand, ranging, etc.) for inter-agency cross support. This needs to be addressed both in a traditional “single-hop” environment and a space internetworking environment.​


​Establish the normative recommendation for a framework for terrestrial Cross Support Transfer Services (CSTS) and normative recommendations for the application of the framework to inter-agency terrestrial data transfer services. A key characteristic of this goal is that it shall be extensible and that it shall be clear for subsequent efforts as to how the extensibility is​​ to be performed.​


Establish the normative service management recommendations for data format definitions and management service for exchanges of information between a mission operations ground system and an agency TTC network.   A key characteristic of this goal is that the recommendations developed shall be extensible to incorporate management of future services (e.g., optical space links) as they become standardized. It shall be clear as to how the extensibility is to be performed.​  Data format definitions shall have higher priority such that they shall precede the management service definition. 


​Develop a normative adaptation profile recommendation to address bulk data transfers for inter-agency cross support, providing basic metadata definitions for normative identification and basic management of files typically transferred between agencies.​