This Recommendation provides an information model for the management of subnetwork connection protection of Synchronous Digital Hierarchy (SDH) subnetwork. This model describes the managed object classes and their properties for the subnetwork connection protection function, as defined in Recommendation G.803 [13] and as related to SDH network elements. These objects are useful to describe information exchanged across interfaces defined in M.3010 [4] Telecommunications Management Network (TMN) architecture for the management of the subnetwork connection protection function.