Request primitive to the protocol entity see

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Unformatted text preview: 4.1 DIRECTIVE REQUEST To control the operations of COP-1, the authorized user at the sending end can invoke a Directive by passing the DIRECTIVE.request primitive to the protocol entity (see reference [3]). The type of Directive shall be indicated by the parameter Directive Type of the DIRECTIVE.request primitive. If the Directive has a parameter, it shall be carried by the parameter Directive Qualifier. A DIRECTIVE.request primitive issued by the user shall be translated by the Higher Procedures to a directive request signal (see 3.2.2.2.2), which is then delivered to FOP-1. The Directive Types of the DIRECTIVE.request primitive defined here shall also be used as the Directive Types of the directive request signal given to FOP-1. In this subsection, the Directive Types used by COP-1 are defined. The Directive Types are classified into four categories: a) four ‘Initiate AD Service’ Directives; b) one ‘Terminate AD Service’ Directive; c) one ‘Resume AD Service’ Directive; d) five ‘FOP-1 Setup’ Directives. Any other Directive will be rejected and reported as an invalid Directive. Table 4-1 shows the Directive Types and Directive Qualifiers defined for COP-1. For other parameters used by the DIRECTIVE.request primitive, see reference [3]. These twelve Directives correspond to Events E23 through E40 in the FOP-1 State Table (table 5-1). NOTES 1 The FOP-1 Directives include the ‘Terminate AD Service’ Directive. In the ‘Initial’ State (S6) this Directive is not effective in the case that the Suspend_State (SS) is not equal to zero. When SS is not equal to zero, it means that the FOP-1 AD Service has been suspended. In this case, the Directive is Accepted and Confirmed but the AD Service remains suspended (i.e., Suspend_State remains different from zero, the queues are not purged, etc.). To terminate a suspended AD Service, the service may first be resumed with a ‘Resume AD Service’ Directive (and then a subsequent CCSDS 232.1-B-2 Page 4-1 September 2010 RECOMMENDED STANDARD FOR COMMUNI...
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