705x2b1s - CCSDS

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CCSDS HISTORICAL DOCUMENTRECOMMENDATION FOR ADVANCED ORBITING SYSTEMS2.3.1 PacketConstruction ProcessThis process accepts primitives on the [pkt] and [oct] gate, constructing packets in the case of theOctetString service, or checking their format in the case of the UserFormatted service. Thesepackets are passed through the [int] gate along with the PathID to be relayed onwards asnecessary.The process is passed five parameters:PathServiceTypePathIDSequenceCountpacketTypemaxSDULengthdetermines which gate the process will accept primitives on.the PathID (i.e., SAP) to accept primitives on.used only by the OctetString service, this is updated witheach Packet sent, the initial value being set by management.the value to be placed into the Packet Type field of Packetsconstructed on the OctetString service.the maximum length for SDUs on this Path; taken to belength of OctetString for the OctetString service, or totallength of Packet for UserFormatted service.The variable called ‘Data’ at the [oct] gate refers to the O_SDU which is part of theOCTET_STRING.request primitive.CCSDS 705.2-B-1 Page 2-13 May 1994CCSDS HISTORICAL DOCUMENT
CCSDS HISTORICAL DOCUMENTRECOMMENDATION FOR ADVANCED ORBITING SYSTEMSprocess PacketConstruction [pkt,oct,int](pathServiceType : Service,pathID : PathID,SequenceCount : PacketSequenceCount,packetType : PacketType,maxSDULength : Nat) : noexit :=(let SAP : PathId = pathID in([pathServiceType Eq OctetString] ->(oct ! SAP? Path : PathID? SHI : SecondaryHeaderIndicator? Data : OctetString [LengthOf(Data) Le maxSDULength] ;[]int ! Path! MakeCCSDSPacket(MakePrimaryHeader(MakePacketID(version1, packetType,SHToSHF(SHI), APIDPart(Path)),MakePacketSC(PacketSequenceUnSeg, SequenceCount),ConvertNatToPL(Pred(LengthOf(Data)))),Data) ;PacketConstruction [pkt,oct,int](pathServiceType,pathID,Next(SequenceCount),packetType,maxSDULength))NOTE – The APID Qualifier is an optional part of the Path Identifier; if the Qualifier is not tobe used, then the value “NullAPIDQual” should be applied.[pathServiceType Eq UserFormatted] ->(pkt ! SAP? Qual : APIDQual? Packet : CCSDSPacket[(GetPacketLength(GetPrimaryHeader(Packet)) eqConvertNatToPL(Pred(LengthOf(GetUserData(Packet)))))and ((LengthOf(GetUserData(Packet))+6) Le maxSDULength)and (GetVersion(GetPrimaryHeader(Packet)) eq Version1)and (UserAPID(GetAPID(GetPrimaryHeader(Packet))))] ;int ! PathID ! Packet;PacketConstruction [pkt,oct,int](pathServiceType,pathID,Next(SequenceCount),packetType,maxSDULength))))endproc PacketConstructionCCSDS 705.2-B-1 Page 2-14 May 1994CCSDS HISTORICAL DOCUMENT
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Page 11 and 12: 2.1.2 Logical Data PathsCCSDS HISTO
Page 15 and 16: 2.2.2 Relaying TableCCSDS HISTORICA
Page 19 and 20: 2.3 THE BEHAVIOURRECOMMENDATION FOR
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