ECSS-E-ST-50-04C(31July2008).pdf

ECSS-E-ST-50-04C 31 July 2008 Space engineering Space data links - Telecommand protocols synchronization and channel coding ECSS Secretariat ESA-ESTEC Requirements whetherornotinjurywassustainedbypersonsor propertyorotherwise;andwhetherornotlosswassustainedfrom,oraroseoutof,theresultsof,the item,oranyservicesthatmaybeprovidedbyECSS. Publishedby:ESARequirementsandStandardsDivision ESTEC, P.O. Box 299, 2200 AG Noordwijk The Netherlands Copyright: 2008 by the European Space Agency for the members of ECSS 2 ECSSEST5004C 31July2008 Change log ECSSE5004A 14November2007 Firstissue ECSSE5004BNeverissued ECSSEST5004C 31July2008 Secondissue EditorialchangesforconsistencywithCCSDSandotherECSSstandards 3 ECSSEST5004C 31July2008 Table of contents Change log.3 1 Scope.12 2 Normative references.13 3 Terms, definitions and abbreviated terms.14 3.1 Terms from other standards.14 3.2 Terms specific to the present standard .14 3.3 Abbreviated terms .15 3.4 Conventions .16 3.4.1 Bit 0, bit 1, bit N1.16 3.4.2 Most significant bit.16 3.4.3 Use of capitals for the names of data structures and fields.16 4 Overview.17 4.1 Presentation .17 4.2 Protocol profiles.17 4.3 Segmentation sublayer.18 4.4 Transfer sublayer .19 4.5 Synchronization and channel coding sublayer.19 4.6 Physical layer .19 4.7 Virtual channels.20 5 Segmentation sublayer.21 5.1 Overview .21 5.2 TC Segment .22 5.2.1 General.22 5.2.2 Segment Header .23 5.2.3 Segment Data Field.24 5.3 Transfer notification.24 5.3.1 Overview.24 5.3.2 Requirements.25 4 ECSSEST5004C 31July2008 5.4 Blocking of packets .26 5.4.1 Overview.26 5.4.2 Virtual channels where TC Segments are used.26 5.4.3 Virtual channels where TC Segments are not used.27 5.4.4 Packet properties.27 5.4.5 Blocking function .28 5.4.6 Deblocking function.28 5.5 Segmentation .28 5.5.1 Overview.28 5.5.2 Segmenting function.29 5.5.3 Reassembly function.29 5.5.4 Packet assembly controller.30 5.6 MAP multiplexing.33 6 Transfer sublayer .35 6.1 Overview .35 6.1.1 Data structures in the transfer sublayer.35 6.1.2 Procedures in the transfer sublayer.35 6.2 TC Transfer Frame definition .37 6.2.1 General.37 6.2.2 Transfer Frame Primary Header.38 6.2.3 Transfer Frame Data Field .42 6.2.4 Frame Error Control Field.43 6.3 CLCW definition .45 6.3.1 General.45 6.3.2 Control Word Type .47 6.3.3 CLCW Version Number.47 6.3.4 Status Field.47 6.3.5 COP in Effect.47 6.3.6 Virtual Channel Identification.47 6.3.7 Reserved Spare.48 6.3.8 No RF Available Flag.48 6.3.9 No Bit Lock Flag.49 6.3.10 Lockout Flag.49 6.3.11 Wait Flag .50 6.3.12 Retransmit Flag.50 6.3.13 FARM-B Counter.50 6.3.14 Reserved Spare.50 5 ECSSEST5004C 31July2008 6.3.15 Report Value.51 6.4 Frame header procedure.51 6.5 Frame error control procedure at the sending end.51 6.6 Frame delimiting and fill removal procedure .51 6.6.1 Overview.51 6.6.2 Actions.52 6.7 Frame error control procedure at the receiving end.52 6.8 Frame header validation procedure .52 6.8.1 Overview.52 6.8.2 Actions.53 6.9 Virtual channel multiplexing.53 6.9.1 Overview.53 6.9.2 Multiplexing mechanism.54 6.9.3 Demultiplexing.54 7 COP-1.55 7.1 Overview .55 7.1.1 Scope .55 7.1.2 Interfaces.55 7.1.3 Retransmission protocol.55 7.1.4 Frames .56 7.1.5 Services.56 7.1.6 Protocol machine.58 7.2 Internal variables.58 7.2.1 Overview.58 7.2.2 FOP-1 Variables.59 7.2.3 FARM-1 variables.66 7.3 Features of COP-1 interfaces.71 7.3.1 Overview.71 7.3.2 Parameters.72 7.4 Upper interface of COP-1 at the sending end .73 7.4.1 Overview.73 7.4.2 Sequence-controlled service management interface .73 7.4.3 Sequence-controlled service data transfer interface.79 7.4.4 Expedited service data transfer interface.82 7.5 Upper interface of COP-1 at the receiving end .84 7.5.1 Overview.84 7.5.2 Buffer management mechanism.84 6 ECSSEST5004C 31July2008 7.5.3 The wait system.84 7.5.4 Single back-end buffer.85 7.5.5 FDU Arrived Indication .86 7.6 Lower interface of COP-1 at the sending end .86 7.6.1 Overview.86 7.6.2 Transmit Request for Frame signal.87 7.6.3 Abort request signal.87 7.6.4 Response signal.88 7.7 Lower interface of COP-1 at the receiving end .88 7.7.1 Overview.88 7.7.2 Valid Frame Arrived Indication .89 7.8 Format of COP-1 control commands.89 7.8.1 Overview.89 7.8.2 General.89 7.8.3 Unlock.89 7.8.4 Set V(R).90 7.9 Actions.90 7.9.1 Format of the state tables.90 7.9.2 FOP-1.91 7.9.3 FARM-1.98 8 Synchronization and channel coding sublayer .113 8.1 Overview .113 8.2 BCH codeblock.113 8.2.1 General.113 8.2.2 Information.114 8.2.3 Error Control.114 8.3 Communications link transmission unit (CLTU).115 8.3.1 General.115 8.3.2 Start Sequence.115 8.3.3 Encoded Data.116 8.3.4 Tail Sequence.116 8.4 Randomization procedure .117 8.4.1 Overview.117 8.4.2 General.117 8.4.3 Random sequence .117 8.4.4 Application of the randomizer.118 8.5 BCH codeblock encoding procedure.118 7 ECSSEST5004C 31July2008 8.6 Fill bits .119 8.6.1 Overview.119 8.6.2 General.119 8.7 Channel logic at the receiving end .120 8.8 BCH codeblock decoding procedures.121 8.8.1 O