Description
EFM defines how Ethernet can be transmitted over new media types using new Ethernet physical layer (PHY) interfaces:
- Voice-grade copper. These new EFM copper (EFMCu), or Ethernet over copper, interfaces allow optional multi-pair aggregation
- Long wavelength single optical fiber (as well as long wavelength dual-strand fiber)
- Point-to-multipoint (P2MP) fiber. These new interfaces are known under the collective name of Ethernet over passive optical networks (EPON).
EFM also addresses other issues, required for mass deployment of Ethernet services, such as operations, administration and management (OA&M) and compatibility with existing technologies (such as plain old telephone service spectral compatibility for copper twisted pair).
Read more about this topic: Ethernet In The First Mile
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