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Unformatted text preview: RTY” = SYMBOL STREAM WITH POSSIBLE ERRORS
OR SOFT DECISIONS. Figure B-1: TC Channel Service Model CCSDS 201.0-B-3 Page B-2 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE Within a fully implemented CCSDS Telecommand system, operation of the Channel Service
begins when the buffer of information bits corresponding to one or more complete TC
Transfer Frames (plus their related operational control information) is delivered from the
Transfer layer to the sending end of the Coding layer for radiation through the physical
telecommand channel to the spacecraft. (See Figure B-2.)
The TC Transfer Frames are encoded by the Coding layer into short, fixed length TC
Codeblocks which provide a noise immunity capability that is compatible with overall TC
Frame rejection and undetected error requirements. A TC Transfer Frame is transmitted as a
sequential set of TC Codeblocks, with the entire set of Codeblocks being encapsulated by the
Coding layer within a “Command Link Transmission Unit” (CLTU) data structure: a CLTU
may contain one or more encoded Transfer Frames. If th...
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- Spring '14