The Transport/Network technologies, encompassing transport and (or) higher-level
functions such as switching and routing, employ a variety of physical media, both wired
and wireless. Some of the technologies may, in fact, also use multiple physical media to
deliver Ethernet services.
Each of the three layers??”Application, Ethernet, and Transport/Network??”can be
further dissected into three key operational components or planes:
?– Data or User Plane This enables the flow of customer data between the network
elements.
?– Control Plane The Control Plane provides the functional elements that support
flow management functions among the NEs participating in the data plane.
The Control Plane also provides the signaling mechanisms necessary to support
setup, supervision, and connection release operations, among other flow control
functions.
?– Management Plane The management plane provides the functional elements
that support fault, configuration (including flow and/or connection configuration),
account, performance, and security (FCAPS) functions, as well as any related operations,
administration, and maintenance (OAM) tools.
The discussion of each of the Transport/Network technologies/solutions, in the subsequent
chapters, will include a discussion of these three operational planes, wherever
appropriate.
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