Table 3 2 tc channel service events receiving end

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Unformatted text preview: ndomized (if used), and their contents are transferred to the layer above. Table 3-2: TC Channel Service Events (Receiving End) Event Number Event Name Event Definition E1 CHANNEL ACTIVATION Bit modulation is detected and bit lock is achieved: telecommand bit stream is present. E2 CHANNEL DEACTIVATION Bit lock is lost or telecommand signal is lost: telecommand bit stream is NOT present. E3 START SEQUENCE FOUND The Start Sequence pattern has been detected, signaling the beginning of the first codeblock of the CLTU. E4 CODEBLOCK REJECTION The decoder has indicated uncorrected errors in a codeblock. No data from this codeblock are transferred to the layer above. CCSDS 201.0-B-3 Page 3-6 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE E4 E1 S1 (INACTIVE) E3 S2 (SEARCH) S3 (DECODE) E2 E2 Figure 3-5: TC Channel Service State Diagram (Receiving End) 3.3.5 TC CODEBLOCK DECODING PROCEDURES 1 Codeblocks that have been encoded using the modified BCH code described in 3.3.2 may be decoded either in an error-detecting mode or in an error-corr...
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