ITU M.21:1992

ITU M.21:1992 Maintenance Philosophy For Telecommunication Services Describes the maintenance philosophy for telecommunication services. It also defines service maintenance phases, service supervision capabilities, and bringing into service requirements.

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Table of Contents

1General
1.1Servicemaintenanceobjectives
2Overallservicemaintenancephilosophy
2.1Servicesupervisioncapabilities
2.2Relationshipstonetworkfailureconcepts
3Bringingintoservice
3.1Verificationofservicefromthenetwork
perspective
3.2Verificationofservicefromthecustomer/user
perspective
3.3Detailedconsiderations
3.4Identificationofresponsibilities
4Maintenancephases
4.1Performance/qualitysurveillance
4.2Servicedegradationdetection
4.3Servicerestoration
4.4Servicerestorationtime
4.5Failureorperformanceinformation
4.6Faultlocalization
4.7Faultrecoverytime
4.8Faultcorrection
4.9Verification
4.10Restoration
5Additionalmaintenanceactivities
5.1Maintenancesupport
5.2Failurestatistics
5.3Preventivemaintenance
6Othermaintenanceconsiderations
References

Abstract

Describes the maintenance philosophy for telecommunication services. It also defines service maintenance phases, service supervision capabilities, and bringing into service requirements.

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