IP MAN is based on business requirements established in the province, cities and regions, in principle, a single metropolitan city as a unit separate building. IP MAN generally from the core layer, the convergence layer and access layer, some small IP MAN is also simplified as a two-tier structure. Core node device using the IP / MPLS technology as the core equipment, such as large-capacity high-end high-end router or routing switch; convergence layer with integrated services capabilities with IP routing and switching equipment, such as the BRAS and the access router AR; access into the layer device with the ability to multi-service access, according to the type of business end users need and line of resources to choose the general use of pure IP devices, xDSL equipment, broadband access devices, broadband and narrowband integrated access devices. Some network management is based on the management of network elements, the main achievement of local, extensive qualitative management of the overall network level can not be unified management of the network, can not achieve a higher level of resource management and operations support. IP Metropolitan Area Network equipment providers with their own separate network management system for equipment management, increase the complexity of the operation and management, to routine maintenance, resource management, fault handling has led to great difficulties.
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