The
delivery of these Carrier Ethernet services can be over various media and the transport
and networking technologies that make up the TRAN layer (the subject of Part II).
10 Since the MEF has extended its focus beyond the metro and into the WAN, it is generally more accurate to
label the Metro Ethernet Network (MEN) as the Service Provider Ethernet Network (SEN), which could
support the MAN and/or WAN.
58 Chapter 2
As will become evident in Part II, often the current??”and evolving??”attributes of Carrier
Ethernet reside in the TRAN layer (depending on the specific technologies).
Each of the three layers has three associated operational planes: a Data plane, a
Control plane, and a Management plane.
The Data plane, also referred to as the user/transport/forwarding plane, provides the
functional elements required to steer the subscriber flow and supports the transport
of subscriber traffic units among MEN Network Elements (NEs). The Control plane
provides the functional elements that support distributed flow-management functions
among NECs participating in the MEN data plane. The Control plane also provides the
signaling mechanisms necessary to support distributed setup, supervision, and connection
release operations, among other flow-control functions.
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