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Unformatted text preview: ecting mode, depending on
mission requirements. When the error-detecting mode is chosen, one, two or three bits in
error will be detected within the codeblock (not counting the appended Filler Bit); when the
error-correcting mode is used, one bit in error will be corrected and two bits in error will be
detected. 1 The description to follow assumes a hard-limiting detector before decoding, but a softlimiting detector is not intended to be precluded. CCSDS 201.0-B-3 Page 3-7 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE 4 PHYSICAL LAYER: STANDARD DATA STRUCTURES AND
PROCEDURES 4.1 OVERVIEW OF THE PHYSICAL LAYER The Physical layer provides the radio frequency data path which connects the transmitting
station to the spacecraft, and its associated Physical Layer Operational Procedures (PLOPs),
in order to support the transmission of telecommand data.
4.2 STANDARD DATA STRUCTURES WITHIN THE LAYER The standard data structures within this layer are the Acquisition Sequence, CLTU, and the
Idle Sequence. They are used to provide synchronization of the symbo...
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