Carrier Ethernet Services
To create a market in Ethernet services, it is necessary to clarify and standardise the services to be provided. Recognising this, the industry created the Metro Ethernet Forum. This played a key role in defining:
- E-Line: a service connecting two customer Ethernet ports over a WAN.
- E-LAN: a multipoint service connecting a set of customer endpoints, giving the appearance to the customer of a bridged Ethernet network connecting the sites.
- E-Tree: a multipoint service connecting one or more roots and a set of leaves, but preventing inter-leaf communication.
All these services provide standard definitions of such characteristics as bandwidth, resilience and service multiplexing, allowing customers to compare service offerings and facilitating service level agreements (SLAs). Analogous definitions for wireless networks are defined in IEEE 802.21 and IEEE 802.11u, though these are intended for much shorter time commitments and services appropriate for mobile users only.
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