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Unformatted text preview: S OPERATION PROCEDURE-1 NOTE – The ‘Negative Confirm Response to Directive’ notification does not carry a parameter giving the reason for the failure to confirm performance of the service requested by the Directive. However, whenever a condition is detected which might give rise to a ‘Negative Confirm Response to Directive’ notification, an ‘Alert’ notification is signaled by FOP-1. 4.3 4.3.1 ASYNCHRONOUS NOTIFICATION GENERAL The protocol entity shall notify the user at the sending end of an event that occurs asynchronously with requests by passing the Async_Notify.indication primitive (see reference [3]). The type of notification shall be indicated by the parameter Notification Type of the Async_Notify.indication primitive. If the notification has a parameter, it shall be carried by the parameter Notification Qualifier. An Async_Notify.indication primitive delivered to the user shall be translated from an asynchronous notification signal generated by FOP-1 (see The Notification Types of the Async_Notify.indication primitive defined here are also used as the Notification Types of the asynchronous notification signal generated by FOP-1. Table 4-3 shows the Notification Types and Notification Qualifiers of the Async_Notify.indication primitive defined for COP-1. For other parameters used by the Async_Notify.indication primitive, see reference [3]. Table 4-3: Notification Types for Async_Notify.indication Notification Type Notification Qualifier Alert Reason Code Suspend None 4.3.2 ALERT If an unrecoverable condition is detected on the link, then the FOP-1 shall generate an ‘Alert’ notification. The ‘Alert’ notification shall serve as notice of the termination of the SequenceControlled Service guarantee. NOTE – When the ‘Alert’ notification is issued by FOP-1, recovery actions by a higher layer protocol may be necessary to ensure that data are not lost, duplicated or erroneous. However, there is no guarantee that a higher layer protocol can always perform recovery actions successfully. CCSDS...
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