ITU-T G.774.4 PDF

This Recommendation addresses the management of the automatic protection switching within network element at the high and low order path layers. It covers the subnetwork connection protection as described in ITU-T G.803 and G.841.

This Recommendation provides an information model, as related to the subnetwork connection protection function for the Synchronous Digital Hierarchy (SDH). It identifies the Telecommunications Management Network (TMN) object classes required for the management of the subnetwork connection protection function for SDH network elements. These objects are relevant to information exchanged across standardized interfaces defined in ITU-T M.3010 TMN architecture.

This Recommendation applies to SDH network elements which perform the subnetwork connection protection function and those systems in the TMN that manage SDH network elements.

The new objects defined in this Recommendation supersede those defined in ITU-T G.774.4 (1995). For each object class, attribute, action, notification, parameter defined in this Recommendation it shall be indicated what the impacts upon the existing ITU-T G.774.4 (1995) are.

Structure of this Recommendation

Clause 5.1 provides an overview of the SDH subnetwork connection protection information model. Clauses 6-14 describe the information model using the notation mechanisms defined in ITU-T X.722, Guidelines for the Definition of Managed Objects. Clause 14 contains the syntax definitions of the information carried in the protocol using Abstract Syntax Notation One (ASN.1) defined in ITU-T X.680-X.683. Naming and Inheritance are illustrated in Annex A. The state transition diagrams are provided in Annex C. Diagrams illustrating the subnetwork connection protection are provided in Annex B.