This Recommendation contains a specification for a generic network level management information model expressed in GDMO notation. This model was developed from existing Recommendation M.3100 managed object classes, and based on the following Recommendations: - ITU-T Recommendation G.852.1 (1996), Enterprise viewpoint for simple subnetwork connection management. - ITU-T Recommendation G.852.2 (1999), Enterprise viewpoint description of transport network resource model. - ITU-T Recommendation G.852.3 (1999), Enterprise viewpoint for topology management. - ITU-T Recommendation G.852.6 (1999), Enterprise viewpoint for trail management. - ITU-T Recommendation G.852.8 (1999), Enterprise viewpoint for pre-provisioned adaptation management. - ITU-T Recommendation G.852.10 (1999), Enterprise viewpoint for pre-provisioned link connection management. - ITU-T Recommendation G.852.12 (1999), Enterprise viewpoint for pre-provisioned link management. - ITU-T Recommendation G.853.2 (1996), Subnetwork connection management information viewpoint. - ITU-T Recommendation G.853.3 (1999), Information viewpoint for topology management. - ITU-T Recommendation G.853.6 (1999), Information viewpoint for trail management. - ITU-T Recommendation G.853.8 (1999), Information viewpoint for pre-provisioned adaptation management. - ITU-T Recommendation G.853.10 (1999), Information viewpoint for pre-provisioned link connection management. - ITU-T Recommendation G.853.12 (1999), Information viewpoint for pre-provisioned link management. - ITU-T Recommendation G.854.3 (1999), Computational viewpoint for topology management. - ITU-T Recommendation G.854.6 (1999), Computational viewpoint for trail management. - ITU-T Recommendation G.854.8 (1999), Computational viewpoint for pre-provisioned adaptation management. - ITU-T Recommendation G.854.10 (1999), Computational viewpoint for pre-provisioned link connection management. - ITU-T Recommendation G.854.12 (1999), Computational viewpoint for pre-provisioned link management.