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Unformatted text preview: is annex show only services used by higher-layer protocols and do not show services used within the same protocol (i.e., VC and MC Frame Services). These diagrams also show how service users are identified with identifiers and addresses. B1 CONVENTIONS USED IN THE DIAGRAMS The conventions used in the diagrams of this annex are explained below. a) Protocol names in bold italic are potential users of the services. b) Selection (shown with sets of dotted lines in the diagrams) is a function of selecting one (and only one) of the connections shown with dotted lines. c) Commutating (shown with boxes in the diagrams) is a function of blocking, according to the formatting rule specified by the protocol definition, multiple data units, each from a different service, in a single Protocol Data Unit sharing the same identifier (e.g., the same VCID). d) Decommutating is the inverse process of commutating. e) Multiplexing (shown with triangles in the diagrams) is a function of mixing, according to an algorithm established by the project, multiple streams of data units, each with a different identifier, generating a single stream of data units. f) Demultiplexing is the inverse process of multiplexing. g) Names in triangles are identifiers or addresses used as the key for the multiplexing/demultiplexing process. Graphical conventions used in the diagrams are summarized in figure B-1. CCSDS 130.2-G-1 Page B-1 December 2007 CCSDS REPORT CONCERNING THE SPACE DATA LINK PROTOCOLS Selection Commutator/ Decommutator Multiplexer/ Demultiplexer Figure B-1: Graphical Conventions CCSDS 130.2-G-1 Page B-2 December 2007 CCSDS REPORT CONCERNING THE SPACE DATA LINK PROTOCOLS B2 TC DATA LINK PROTOCOL Figure B-2 shows major services provided by the TC Data Link Protocol and how these services are used by other space link protocols. MAP Packet Service Space Packet Protocol SCPS-NP IP version 4 Encapsulation Service PVN MAP Access Service CFDP MAP Channels MAP ID VC Packet Service Space Packet Protocol SCPS-NP IP version 4 Encapsulation Packet PVN VC Access Service CFDP Virtual Channels VCID Master Channels MCID Physical Channel Figure B-2: TC Data Link Services CCSDS 130.2-G-1 Page B-3 December 2007 CCSDS REPORT CONCERNING THE SPACE DATA LINK PROTOCOLS B3 TM DATA LINK PROTOCOL Packet Service Space Packet Protocol SCPS-NP IP version 4 Encapsulation Service PVN VC Access Service VC FSH/OCF Service Virtual Channels VCID MC FSH/OCFService Master Channels MCID Physical Channel Figure B-3: Service Provided by TM-SDLP CCSDS 130.2-G-1 Page B-4 December 2007 CCSDS REPORT CONCERNING THE SPACE DATA LINK PROTOCOLS B4 AOS DATA LINK PROTOCOL Figure B-4 shows major services provided by the AOS Data Link Protocol and how these services are used by other space link protocols. Packet Service Space Packet Protocol SCPS-NP IP version 4 Encapsulation Service PVN Bitstream Service VC Access Service VC OCF Service Virtual Channels VCID MC OCF Service Master Channels MCID Insert Service Physical Channel Figure B-4: AOS Data Link Services CCSDS 130.2-G-1 Page B-5 December 2007...
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This document was uploaded on 03/06/2014.

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