When the error detecting mode is chosen one two or

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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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