ITU-T Recommendation Q.837.2 provides a use case description and analysis for the management interface between an element management system and a network management system. This Recommendation defines part of the management aspects for network resources of SDH-DLC access network equipment. It should be noted that ITU-T Recommendation Q.837.1 contains information of management functionality requirement for both network and network element level as well as the appropriate managed entities to be used in SDH-DLC network. The management information found in ITU-T Recommendation Q.837.1 shall be referred to throughout this Recommendation. Common management functions that are applicable for fault, performance, configuration management functions at NMS-EMS interface are referred to in ITU-T Recommendation Q.827.1. As a common understanding, the element management system is a vendor management system (VMS) and the network management system is an integrated network management system to manage the various EMSs of different vendors.