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With Wide , Metro and Local Area Network s already standardized, the EFM allows continuous standard Ethernet network across the globe, eliminating non-native transport such as Ethernet over ATM from the Access Networks. EFM defines how Ethernet can be transmitted over new media types:
EFM also addresses other issues, required for mass deployment of Ethernet services, such as Operations, Administration & Management ( OAM ) and compatibility with existing technologies (e.g. spectral compatibility for copper). HISTORY The IEEE 802.3ah working group was established in 2001 in order to enable Ethernet penetration into the Access Networks. In parallel the EFM Alliance (EFMA) was formed by the participating vendors, to promote Ethernet subscriber access technology and support the IEEE standard effort. Extreme Launches Ethernet Alliance , ''Light Reading'', December 11, 2001 The EFM standard was approved on 24 Jun 2004 and published on 07 Sep 2004 as IEEE 802.3ah-2004. In 2005 it was included into the base IEEE 802.3 standard. The EFMA got absorbed by the Metro Ethernet Forum . MEF Absorbs EFMA , ''Light Reading'', March 8, 2005 Recently, starting in early 2006, work began on a very high-speed 10 Gigabit/second EPON (XEPON or 10-GEPON or ) standard (http://www.ieee802.org/3/av/). DETAILS The EFM defines the following new Ethernet Physical Layer ( PHY ) interfaces: # EFMC - EFM Copper
#EFMF - EFM Fiber
#EFM PON - EFM Passive Optical Network
Additionally clause 57 defines link-level OAM, including discovery, remote fault indication, loopbacks and variable access. SEE ALSO FURTHER READING REFERENCES EXTERNAL LINKS
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