10 Gigabit Ethernet:
The operation of 10 Gigabit Ethernet (IEE 802.3ae) is similar to
that of lower speed Ethernet networks. It maintains the IEEE
802.3 Ethernet frame size and format which preserves layer 3
and higher protocols. However, 10 Gigabit Ethernet only
operates over point-to-point links in full-duplex mode, eliminating
the need for CSMA/CD. Additionally, it uses only fiber optical
cable at the physical layer.
Gigabit Ethernet defines two physical layer network applications:
• Local Area Network (LAN) PHY—Operates at close to the
10 Gigabit Ethernet rate to maximize throughput over short
• Wide Area Network (WAN) PHY—Supports connections to
circuit-switched SONET networks. The WAN PHY
application includes a WAN interface sublayer (WIS) for
making Ethernet frames recognizable and manageable by the SONET equipment they pass through.
The Metro Ethernet Forum (MEF) is a non profit organization that
was chartered to accelerate the worldwide adoption of carrierclass
Ethernet networks and services. The MEF has specified
two services that replace traditional static permanent virtual
circuits with Ethernet virtual circuits:
• ELINE—Point-to-point service that supports scalability, quality of service (QOS) and VLAN tagging.
• ELAN—multipoint-to-multipoint service that allows hosts to be connect and disconnected dynamically.