Summary

In the current in-force Recommendation ITU-T M.3160 Generic, protocol-neutral management information model, the "Top" object class and naming rules are not explicitly defined. It is not clear which class the protection group object class is derived from. Although there is a presumption that it may be derived from the Top object class, this is not mentioned specifically in Recommendation ITU-T M.3160. There are no operations to manage the objects defined in Recommendation ITU-T M.3160.

Amendment 1 to Recommendation ITU-T M.3160 adds the "Top" object class definition and modifies the "Protection Group" class definition by adding some figures and the protection switch operations.