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.
4.3.1 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 ). 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 18.104.22.168.4). 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 .
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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- Spring '14
- Space Exploration, ........., European Space Agency, CCSDS