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Unformatted text preview: is not retroactive, nor does it commit any Agency to implement the
recommended telecommand concepts at any future time. Nevertheless, all CCSDS Agencies
accept the principle that all future implementations of telecommand which are used in crosssupport situations will be based on this Recommendation.
The CCSDS has developed a layered concept for conventional spacecraft telecommanding,
which is summarized in Reference . Standard services are defined within each layer, and
Agencies will be encouraged to develop corresponding facilities to provide these services in
support of Projects.
To be fully compatible with the CCSDS concept, a conventional Project’s telecommanding
architecture should follow this Recommendation for Data Routing Service, plus the
Recommendations for telecommand “Data Management Service” and telecommand
“Channel Service”, which are described in References  and . Projects may also elect to
be partially compatible with the concept by interfacing with the standard systems at
intermediate layers within any of the service specifications.
Advanced Orbiting Systems (AOS) may use the AOS data structures and protocols defined
in Reference  for uplinking data and control information or they may use the telecommand
data structures and protocols defined here and in References ,  and  in a hybrid
fashion. See Reference  for a discussion of hybrid support.
Where preferred options or mandatory capabilities are clearly indicated herein, the indicated
sections of the specification must be implemented when this Recommendation is used as a
basis for cross-support. Where optional subsets or capabilities are allowed or implied in this
specification, implementation of these options or subsets is subject to specific bilateral crosssupport agreements between the Agencies involved. CCSDS 202.0-B-2 Page 1-1 CCSDS HISTORICAL DOCUMENT November 1992 CCSDS HISTORICAL DOCUMENT
CCSDS RECOMMENDATION FOR TELECOMMAND: DATA ROUTING SERVICE The recommendations in this document are to be invoked through the normal standards
programs of each member Agency, and are applicable to those missions for which crosssupport based on capabilities described in these recommendations is anticipated.
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