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).
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
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 -,
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
 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.  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  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.  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.  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.  Information Technology—Open Systems Interconnection—Basic Reference Model: The
Basic Model. International Standard, ISO/IEC 7498-1:1994. 2nd ed. Geneva: ISO,
1994.  Proximity-1 Space Link Protocol—Data Link Layer. Recomme...
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