ITU-T G.829

ITU-T Rec. G.828 [6] specifies error performance parameters and objectives of international, constant bit rate synchronous digital paths. Error performance objectives of ITU-T Rec. G.828 refer to the hypothetical reference path (HRP) of a length of 27500 km. ITU-T Rec. G.828 does not contain information on path elements. NOTE - Performance objectives for SDH paths using equipment designed prior to the adoption of ITU-T Rec. G.828 in March 2000 are given in ITU-T Rec. G.826 [5]. This Recommendation defines error performance events and block structures for SDH multiplex and regenerator sections (see ITU-T Recs G.707/Y.1322 [1] and G.708 [2] for reference). SDH equipment functional blocks and SDH management are defined in ITU-T Recs G.783 [3] and G.784 [4]. Observing the definitions given in this Recommendation shall ensure that error performance assessment on SDH multiplex and regenerator sections yields compatible results. Definition of events in this Recommendation is based on the same basic concept as in ITU-T Rec. G.828 [6]. The events defined for regenerator sections apply to microwave radio and satellite systems only. Performance monitoring of SDH sections is not mandatory. If implemented, the specifications of this Recommendation apply.