Removal of fill is the responsibility of the layer

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Unformatted text preview: e encoding process; they are not removed by the decoding process. Removal of fill is the responsibility of the layer above, which delimits the end of the Input Data and discards extraneous bits (e.g., fill). NOTE – If randomization is being used, any fill octets that were added to the last codeblock of the CLTU will be derandomized even if they were not randomized. CCSDS 201.0-B-3 Page 3-5 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE 3.3.4 TC CHANNEL SERVICE LOGIC The TC Channel Service Logic at the receiving end is presented in state diagram form (Figure 3-5). To support the state diagrams, a list of “states” and “events” is given in Tables 3-1 and 3-2. There are three states and four events. Table 3-1: TC Channel Service States (Receiving End) State Number State Name State Definition S1 INACTIVE The telecommand channel is INACTIVE (i.e., “no bit lock is achieved”, or, alternatively, “no bit modulation is detected”. S2 SEARCH The incoming bit stream is searched, bit by bit, for the Start Sequence pattern. S3 DECODE TC Codeblocks, which are either free of error or which can be corrected, are received, decoded, and dera...
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