Unformatted text preview: n allows the implementing organizations within each Agency to
proceed coherently with the development of compatible Standards for the flight and ground
systems that are within their cognizance. Agency Standards derived from this
Recommendation may implement only a subset of the optional features allowed herein, or
may incorporate features not addressed by the Recommendation.
In order to establish a common framework within which the Agencies may develop
standardized telecommand services, the CCSDS advocates adoption of a layered systems
architecture. Within this approach, specific layers of service (including their operational
protocol and data structuring techniques) may be selected for implementation according to
The current layered set of CCSDS telecommand Recommendations was developed to match
the conventional free-flying mission environment, as characterized by the transmission of
command data at relatively low uplink data rates to spacecraft of moderate complexity.
Advanced Orbiting Systems (AOS), which are characterized by a more complex mission
environment, including the transmission of multiple data types at very high data rates to
space vehicles which include extensive onboard data networking capability, may choose to
use the AOS protocols and data structures defined in Reference  for both uplink and
downlink or they may use the telecommand data structures and protocols defined here for
This Recommendation for Telecommand Data Routing Service was developed within the
layered architectural framework, and embraces the standard data structures and data
communication procedures which may be used by conventional missions within the
intermediate telecommand system layers.
Through the process of normal evolution, it is expected that expansion, deletion or
modification to this document may occur. This Recommendation is therefore subject to
CCSDS document management and change control procedures which are defined in
Reference. CCSDS 202.0-B-2 ii...
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- Spring '14
- ........., CCSDS