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
Famous quotes containing the word description:
“He hath achieved a maid
That paragons description and wild fame;
One that excels the quirks of blazoning pens.”
—William Shakespeare (1564–1616)
“The next Augustan age will dawn on the other side of the Atlantic. There will, perhaps, be a Thucydides at Boston, a Xenophon at New York, and, in time, a Virgil at Mexico, and a Newton at Peru. At last, some curious traveller from Lima will visit England and give a description of the ruins of St Paul’s, like the editions of Balbec and Palmyra.”
—Horace Walpole (1717–1797)
“I fancy it must be the quantity of animal food eaten by the English which renders their character insusceptible of civilisation. I suspect it is in their kitchens and not in their churches that their reformation must be worked, and that Missionaries of that description from [France] would avail more than those who should endeavor to tame them by precepts of religion or philosophy.”
—Thomas Jefferson (1743–1826)