Those terms are a confirmation b indication c

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Unformatted text preview: information between real systems. Those terms are: a) confirmation; b) indication; c) primitive; d) request; e) response; f) service provider; g) service user. Terms Defined in This Recommendation For the purposes of this Recommendation, the following definitions also apply. Many other terms that pertain to specific items are defined in the appropriate sections. aperiodic: not periodic (see below). asynchronous: not synchronous (see below). CCSDS 132.0-B-1 Page 1-3 September 2003 CCSDS RECOMMENDATION FOR TM SPACE DATA LINK PROTOCOL delimited: handling. having a known (and finite) length; applies to data in the context of data 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’. 1.6.2 NOMENCLATURE The following conventions apply throughout this Recommendation: a) the words ‘shall’ and ‘must’ imply a binding and verifiable specification; b) the word ‘should’ implies an optional, but desirable, specification; c) the word ‘may’ implies an optional specification; d) the words ‘is’, ‘are’, and ‘will’ imply statements of fact. 1.6.3 CONVENTIONS In this document, the following convention is used to i...
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This document was uploaded on 03/06/2014.

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