Unformatted text preview: shown in Table B-1.
Table B-1: Processing of CLTU Elements
Element Implementation Procedure Modulation Start Acquisition Sequence CLTU “Start” Start Sequence A: 0 error in start seq.
B: 0 or 1 error in start
sequence CLTU “Data Unit” Codeblock A: Triple error detection
B: 1-bit error correction CLTU “Finish” Tail Sequence
Idle Sequence Codeblock rejection
Codeblock rejection Modulation End Physical link Stop modulation (post-CLTU):
B: PLOP-2 The overall performance for different combinations of the above strategies (plus variables
such as CLTU length) is given in Reference [C2]. Accordingly, the recommended Channel
Service strategies are as shown in Table B-2.
Table B-2: Recommended Strategies Strategy CLTU
Data Unit Modulation
End 1 A A A or B 2 B B A or B CCSDS 201.0-B-3 Page B-9 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE ANNEX C
(This annex is not part of the Recommendation.) [C1] Procedures Manual for the Consultative Committee for Space Data Systems . CCSDS
A00.0-Y-7. Yellow Book. Issue 7. Washington, D.C.: CCSDS, November 1996.
[C2] Telecommand: Summary of Concept and Rationale. Report Concerning Space Data
Systems Standards, CCSDS 200.0-G-6. Green Book. Issue 6. Washington, D.C.:
CCSDS, January 1987. CCSDS 201.0-B-3 Page C-1 June 2000...
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