Summary

This Recommendation provides procedures for fault detection and localization with and without in‑service monitoring for PDH paths, sections, and transmission systems and for SDH paths and multiplex sections. Filtering and thresholding of performance information are described for reporting to the TMN. Returning into service and long-term trend analysis are considered.

SDH systems designed according to Recommendation G.826 (i.e. prior to the approval of Recommendation G.828) are not required to support the BBE and SEP event counters.

Maintenance of systems designed to Recommendation G.826 should use the limits given in Recommendation M.2101.1.