Summary

This Recommendation provides limits for bringing-into-service and maintenance of international multi-operator PDH paths which operate at or above the primary rate, and connections which operate below the primary rate. Error, timing and availability performance are considered. A method for deriving ES and SES from in-service measurement is given for all hierarchical levels. Sections are not covered by this Recommendation. BIS limits and maintenance procedures for radio sections are described in the relevant ITU-R Recommendations.