TMN逻辑分层

描述如下：

v      BML

–         High-level planning, budgeting, goal setting, executive decisions, business level agreements (BLAs), etc.

v       SML

–         Uses information presented by NML to manage contracted service to existing and potential customers.

–         This is the basic point of contact with customers for provisioning, accounts, quality of service, and fault management.

–         The key point for interaction with service providers and with other administrative domains.

v      NML

–         NML has visibility of the entire network, based on the NE information presented by the EML OSs.

–         The NML manages individual NEs and all NEs as a group.

–         The NML coordinates all network activities and supports the demands of the SML.

v       EML

–         Manages each network element.

–         EML element managers, or OSs, are responsible for the TMN-manageable information in certain network elements.

v      NEL

–         The NEL presents the TMN-manageable information in an individual NE.

–         Both the Q-Adapter, which adapts between TMN and non-TMN information, and the NE are located in the NEL.