This
???middle??? bandwidth opportunity, the Mid-Band Ethernet market, will be the prime
service growth area for the next decade. Mid-Band Ethernet technologies use DSL
physical layers and run Ethernet natively over one or more copper pairs to create
highly reliable, high-bandwidth services.
Technology Description
In June 2004, IEEE 802.3 ratified a new amendment to the Ethernet standard, IEEE
802.3ah Ethernet in the First Mile (EFM) [1]. This standard adapted Ethernet??”the
best known and most widely used LAN technology in history??”for widespread deployments
in carrier access networks. With EFM, complex and costly ATM or SONET/SDH
access networks can be migrated to simpler, more cost-effective Ethernet access networks,
resulting in immediate savings in capital and operating expenditures, as well as
increased bandwidth and service options to the subscriber.
As part of its sweeping potential in the access network, the EFM standards group defined
two technologies for delivering Ethernet over plain-old telephone lines: 2BASE-TL and
10PASS-TS. These technologies offer higher bandwidth and higher quality services than
existing T1/E1 and xDSL solutions, delivering the simplicity and flexibility of Ethernet,
while still maintaining spectral compatibility within the existing access network.
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