Ethernet in the First Mile

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Ethernet in the First Mile, also known as IEEE 802.3ah and EFM, is a point-to-multipoint technology designed to allow standard Ethernet frames to unidirectionally travel from subscriber networks directly to end user equipment.

It consists of seven new clauses:

• 100BASE-LX10 —
• 100BASE-BX10 —
• 1000BASE-LX10 —
• 1000BASE-BX10 —
• 1000BASE-PX10 —
• 1000BASE-PX20 —
• 10PASS-TS —
• 2BASE-TL — Allow for full duplex 2 MBit/sec of twisted pair copper wires up to a distance of 2700m (8800 feet).

It was developed out working group 802.3ah and was voted to be part of the IEEE 802.3 in June 2004.

[edit] See also

• IEEE 802.3

[edit] External links

• Download IEEE 802.3
• IEEE 802.3ah Ethernet in the First Mile working group
• Ethernet OAM whitepaper (pdf).
• EFM Knowledge Base at the UNH-IOL