Along these lines, the MEF has defined its own
UNI setup [14] and standardized various Carrier Ethernet service categories for MAN/
WAN operation. These include point-to-point Ethernet Private Line (EPL) and Ethernet
Virtual Private Line (EVPL) services and multipoint-to-multipoint Ethernet Private
LAN (EPLAN) and Ethernet Virtual Private LAN (EVPLAN) services [13]. This section
introduces the EoF and EoWDM approaches for provisioning these new services.
NOTE It is assumed that readers have basic familiarity with these service models.
Ethernet Private Line (EPL) Services
EPL provides point-to-point connectivity using client data interfaces and has similar
characteristics to legacy private lines. Namely, each connection has a standard set of
attributes including traffic parameters such as CIR, EIR, CBS, and EBS. Furthermore,
other attributes are also defined, including performance parameters (SLA packet
delay, packet jitter, and packet loss), service priority, and security [13]. The EVPL service
extends this definition via port-multiplexing; in other words, multiple virtual EPL
connections can share an EPL connection.
A simple means of provisioning EPL services is to interconnect client-side optical
Ethernet ports using (leased/purchased) dark fiber routes or Ethernet over fiber (EoF), as
shown in Figure 8.
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