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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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