Finally when the last cltu has been transmitted

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Unformatted text preview: CLTUs. Finally, when the last CLTU has been transmitted (followed or not by an Idle sequence), the link is deactivated by the PLOP. CCSDS 201.0-B-3 Page B-3 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE INPUT DATA from layer above TC DATA to layer above String of derandomized bits (with possible fill bits). One or more contiguous frames. CODING LAYER FILL RANDOMIZE FILL If used for the mission (optional) DERANDOMIZE If necessary, add fill either before or after Randomization to complete integral number of codeblocks. DECODE CODEBLOCKS, delete parity and filler bit BCH ENCODE, add parity & filler bit for each codeblock Sequence of Codeblocks Decoded (Randomized) Input Data PHYSICAL LAYER ADD START & TAIL SEQUENCE SYNCHRONIZE START OF DECODER Sequence of Codeblocks CLTU Figure B-2: Sequence of Functions If the probability of erroneous data (as measured by the channel decoder) is sufficiently high, the spacecraft channel decoder will enter a “Search for Start Sequence” condition until reset by the next CLTU Start sequence or (optionally) by deactivation of the link by the PLOP....
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This document was uploaded on 03/06/2014.

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