CCITT Rec. M.251 (11/1988) – MAINTENANCE FUNCTIONS TO BE IMPLEMENTED IN CCITT-MML
1 Introduction
2 System functions
3 Scope
4 Maintenance functions in the various maintenance phases
4.1 Failure detection
4.2 System protection (under study)
4.3 Failure information (under study; e.g. change of alarm levels)
4.4 Failure location
4.5 Failure correction (under study)
4.6 Verification
4.7 Restoration
5 Other maintenance functions
6 Relation to Recommendation Z.331 "Maintenance functions"
7 Description of maintenance functions in annexes to this Recommendation
ANNEX A – General description of maintenance tests/measurements
A.1 Introduction
A.2 Tests and measurements
ANNEX B – General description of failure information
ANNEX C – Protection, restoration
ANNEX D – Support of maintenance
References