The codeblock is formulated using a systematic coding

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Unformatted text preview: block format is a fixed-length data entity shown in Figure 3-1. The codeblock is formulated using a systematic coding technique which contains 56 information bits in the leading octets and the error control in the last octet. The TC Codeblock contains an integer number of octets with an overall length of 8 octets (64 bits). TC CODEBLOCK INFORMATION ERROR CONTROL __ _ P0, P1, • • • P6 I 0, I 1, I 2, • • • I 55 56 TC DATA BITS (may be randomized) F0 7 PARITY CHECK BITS APPENDED FILLER BIT Figure 3-1: Telecommand Codeblock Format CCSDS 201.0-B-3 Page 3-1 June 2000 CCSDS RECOMMENDATION FOR TELECOMMAND: CHANNEL SERVICE The COMPLEMENTS of the seven parity check bits, P0 through P6, are located in the first seven bits of the last octet of the TC Codeblock. The complements are used to aid in maintaining bit synchronization and detection of bit slippage. The encoding procedure for generating these parity bits is described in 3.3.2. The last bit of the last octet, F0, is a filler bit appended to provi...
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