Space Link Extension - Service Management - CCSDS

DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT
2 It is assumed that the time standards upon which the Invoker and Performer set their
disposition timers are synchronized to within one (1) second of each other. If this
assumption cannot be made for a particular pair of Invoker and Performer, then
additional methods may be required to compensate for the ambiguity (such as further
decreasing the Performer’s disposition timer value to account for the ambiguity). Any
such adjustment for time standard ambiguity is outside the scope of this
Recommended Standard.
The Performer performs service management validation on the Invocation. The details
of service management level validation are specific to each operation.
If the Invocation is valid at the service management level and the operation can be
performed before the disposition timeout is reached, the Performer performs the invoked
operation and returns a SuccessfulReturn message to the Invoker’s message set port.
The details of the performance of the operation and the information returned as part of the
result are operation-specific. The Performer may perform local functions specific to a
successful operation as part of completing the operation procedure.
If the Invocation is not valid at the service management level, or if the Performer cannot
complete service management validation before the disposition timer expires, the Performer
completes the operation procedure and returns a FailedReturn* message to the
Invoker’s message set port such that the Invoker receives the result before the disposition
timer expires. The FailedReturn* message contains operation-specific diagnostic
information. The Performer may perform local functions specific to a failed operation as part
of completing the operation procedure.
Upon receipt of an UnrecognizedMessageSetResponse or InvalidMessage-
Response, the Invoker validates the exception response in accordance with the Receive
and Validate SLE-SM Exception Response activity subgroup of the Document Exchange
Protocol activity group specified in 3.3. The Invoker attempts to correlate the contents of
each syntactically correct UnrecognizedMessageSetResponse and
InvalidMessageResponse with SLE-SM operation Invocations that have been
sent by the Invoker. If the UnrecognizedMessageSetResponse or
InvalidMessageResponse can be correlated to one or more Invocations, the
Invoker terminates the correlated operation(s), and completes the procedure. The Invoker
may perform local functions specific to an unknown or invalid Invocation as part of
completing the operation procedure (e.g., update local databases to reflect failure of the
operation, contact the Performer to troubleshoot the failure).
Upon receipt of the SleSmMessageSet containing the AcknowledgedReturn
message, the Invoker performs message set validation as specified for the Receive and
Validate SLE-SM Message Set activity subgroup of the Document Exchange Protocol
activity group in 3.3. If the SleSmMessageSet passes message set validation, the Invoker
performs service management validation on the AcknowledgedReturn. The details of
service management validation are specific to each operation, and are specified in the
associated Invoker and Performer requirements for each operation. If the
CCSDS 910.11-R-2 Page 3-48 March 2008