Method to Improve the Management of Operations and Maintenance Processes in the International Telephone Network - Series M: Maintenance: International Transmission Systems Telephone Circuits Telegraphy Facsimile and Leased Circuits; International Public T
This Recommendation provides a reference model which includes both the description of the main parameters and different methods to assess the network performance. The description of a Context Difficulty Index (CDI) which is related to several components of the network and the O&M environment is also provided. It is possible to evaluate the service level performance from CDI and thus decide for any change or intervention as required to improve the perceived quality of the service to the customer.