4 definitions the following definitions are used

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Unformatted text preview: T CONCERNING THE SPACE DATA LINK PROTOCOLS 1.4 DEFINITIONS The following definitions are used throughout this Report. Many other terms that pertain to specific items are defined in the appropriate sections. aperiodic: not periodic (see below). asynchronous: not synchronous (see below). Mission Phase: a period of a mission during which specified communications characteristics are fixed. The transition between two consecutive Mission Phases may cause an interruption of the communications services. periodic: of or pertaining to a sequence of events in which each event occurs at a fixed time interval (within specified tolerance) after the previous event in the sequence. Physical Channel: a stream of bits transferred over a space link in a single direction. space link: a communications link between a spacecraft and its associated ground system or between two spacecraft. A space link consists of one or more Physical Channels in one or both directions. synchronous: of or pertaining to a sequence of events occurring in a fixed time relationship (within specified tolerance) to another sequence of events. Note that ‘synchronous’ does not necessarily imply ‘periodic’ or ‘constant rate’. Space Data Link Protocols: Data Link Layer protocols specified in references [1]-[3], which have been developed to transfer space application data over space-to-ground, groundto-space, or space-to-space communications links. Transfer Frames: Protocol Data Units of the Space Data Link Protocols. 1.5 REFERENCES The following documents are referenced in this Report. At the time of publication, the editions indicated were valid. All documents are subject to revision, and users of this Report are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below. The CCSDS Secretariat maintains a register of currently valid CCSDS documents. [1] TC Space Data Link Protocol. Recommendation for Space Data System Standards, CCSDS 232.0-B-1. Blue Book. Issue 1. Washington, D.C.: CCSDS, September 2003. [2] TM Space Data Link Protocol. Recommendation for Space Data System Standards, CCSDS 132.0-B-1. Blue Book. Issue 1. Washington, D.C.: CCSDS, September 2003. CCSDS 130.2-G-1 Page 1-2 December 2007 CCSDS REPORT CONCERNING THE SPACE DATA LINK PROTOCOLS [3] AOS Space Data Link Protocol. Recommendation for Space Data System Standards, CCSDS 732.0-B-2. Blue Book. Issue 2. Washington, D.C.: CCSDS, July 2006. [4] Communications Operation Procedure-1. Recommendation for Space Data System Standards, CCSDS 232.1-B-1. Blue Book. Issue 1. Washington, D.C.: CCSDS, September 2003. [5] Procedures Manual for the Consultative Committee for Space Data Systems. CCSDS A00.0-Y-9. Yellow Book. Issue 9. Washington, D.C.: CCSDS, November 2003. [6] Information Technology—Open Systems Interconnection—Basic Reference Model: The Basic Model. International Standard, ISO/IEC 7498-1:1994. 2nd ed. Geneva: ISO, 1994. [7] Proximity-1 Space Link Protocol—Data Link Layer. Recomme...
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