3212 the transfer frame secondary header

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Unformatted text preview: rame Secondary Header Version Number 4.1.3.2.2.1 Bits 0–1 of the Transfer Frame Secondary Header shall contain the (Binary Encoded) Transfer Frame Secondary Header Version Number. 4.1.3.2.2.2 The Transfer Frame Secondary Header Version Number shall be set to ‘00’. NOTE – This sub-field indicates which of up to four Secondary Header versions is used. The present Recommendation recognizes only one version, which is Version 1, the binary encoded Version Number of which is ‘00’. CCSDS 132.0-B-1 Page 4-9 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL 4.1.3.2.3 Transfer Frame Secondary Header Length 4.1.3.2.3.1 Bits 2–7 of the Transfer Frame Secondary Header shall contain the Transfer Frame Secondary Header Length. 4.1.3.2.3.2 This sub-field shall contain the total length of the Transfer Frame Secondary Header in octets minus one, represented as a binary number. 4.1.3.2.3.3 The Transfer Frame Secondary Header Length shall be static within the associated Master or Virtual Channel throughout a Mission Phase. NOTE – When a Secondary Header is present, this length may be used to compute the location of the start of the Transfer Frame Data Field. 4.1.3.3 Transfer Frame Secondary Header Data Field 4.1.3.3.1 The Transfer Frame Secondary Header Data Field shall follow, without gap, the Transfer Frame Secondary Header Identification Field. 4.1.3.3.2 The Transfer Frame Secondary Header Data Field shall contain the Transfer Frame Secondary Header data. 4.1.3.3.3 The Transfer Frame Secondary Header Data Field shall be of fixed length within the associated Master or Virtual Channel throughout a Mission Phase. 4.1.4 TRANSFER FRAME DATA FIELD 4.1.4.1 The Transfer Frame Data Field shall follow, without gap, the Transfer Frame Primary Header or the Transfer Frame Secondary Header if present. 4.1.4.2 The Transfer Frame Data Field, which shall contain an integer number of octets, has a length which varies and is equal to: a) the fixed Transfer Frame length which has been selected for use on a particular Physical Channel; minus b) the length of the T...
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This document was uploaded on 03/06/2014.

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