Ethernet Service Types
The Ethernet service type is essentially a generic Ethernet connectivity construct. The
MEF has defined two basic service types:
?– Ethernet Line (E-LINE)
?– Ethernet LAN (E-LAN)
These two form umbrella categories, and any service can be created using these two
categories, modifying only the specific attribute parameters. Therefore, any Ethernet
service will be defined as an E-LINE or an E-LAN service, and it will have its own
unique UNI and EVC attribute parameters. This should be clearer later in the chapter
when we discuss common retail services.
NOTE A third service type called the Ethernet Tree (E-Tree) is also being considered
by the MEF (possibly in MEF specification 6.1); since it is still in discussion, it is not
presented here.
Figure 2.9 Service Multiplexing (Source: MEF)
Service
Multiplexing
at UNI A
EVC 1 UNI
B
UNI
A
MEN
UNI
C
UNI
D
EVC 2
EVC 3
70 Chapter 2
Ethernet Line (E-LINE) Service Any Ethernet service that is based on a Point-to-point
Ethernet Virtual Connection (EVC) is designated as an Ethernet Line (E-LINE) service
type. The Ethernet Line service is illustrated in Figure 2.
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