This Recommendation specifies the functional requirements for the management of SDH-DLC systems at a reference point beyond an element management layer. These requirements are based on ITU-T Rec.M.3400 and defined from the perspective of an operator of a network management system using a combination of network element and network level views. The aim of these requirements is to support the integration of DLC and SDH technologies for fibre-access networks in a multi-vendor environment. The goal of these requirements is to perform the operation, maintenance and administration of these networks in an efficient manner. The management services supported by these requirements include customer administration, network provisioning, quality of service, network performance and maintenance management as defined by ITU-T Rec.M.3200. These functional requirements would be used to develop the use cases and protocol-neutral information model according to M.3020 methodology in a future Recommendation.