You are here

Glossary
1 8 A B C D E F G H I J L M N O P Q R S T U V W
E
  • E-LAN

Ethernet Local Area Network
A Fast Ethernet or Gigabit Ethernet service used for multipoint-to-multipoint transparent Ethernet LAN connectivity, allowing any location to speak with any other location in a customer’s Metro Ethernet network

  • E-Line

Ethernet Line
A service providing a point-to-point Ethernet Virtual Connection (EVC) between two customer user interfaces or two locations in a Metro Ethernet network

  • EFM

Ethernet in the First Mile
(also known as IEEE 802.3ah)

A collection of protocols specified in IEEE 802.3, defining Ethernet in the access networks, i.e. First/Last Mile. EFM also addresses other issues required for mass deployment of Ethernet services, such as operations, administration and maintenance (OAM) and compatibility with existing technologies (e.g. spectral compatibility for copper).

  • EIA

Electronic Industries Association
A standards organization in the U.S. specializing in the electrical and functional characteristics of interface equipment.

  • EMI

Electromagnetic Interference
Radiation leakage outside a transmission medium resulting mainly from the use of high frequency wave energy and signal modulation. EMI can be reduced by appropriate shielding.

  • Encapsulation

Encapsulating data is a technique used by layered protocols in which a low level protocol accepts a message from a higher level protocol, then places it in the data portion of the lower-level frame. The logistics of encapsulation require that packets traveling over a physical network contain a sequence of headers.

  • Ethernet

Most popular local area network (LAN) technology in use today. All stations on the LAN share the total bandwidth, which is at speeds of 10 Mbps (Ethernet), 100 Mbps (Fast Ethernet), or 1000 Mbps (Gigabit Ethernet).

  • Ethernet adapter

An Ethernet adapter or Ethernet controller is a term used to describe an Ethernet network card used to connect a desktop computer to a network.

  • Ethernet Extenders

Ethernet signal degradation typically limits Ethernet cable runs to 100 meters (328 feet). To achieve longer distances, an Ethernet extender is required. These devices can be used to drive Ethernet up to 6.2 kilometers over copper.

  • Ethernet in the First Mile

EFM
(also known as IEEE 802.3ah)

A collection of protocols specified in IEEE 802.3, defining Ethernet in the access networks, i.e. First/Last Mile. EFM also addresses other issues required for mass deployment of Ethernet services, such as operations, administration and maintenance (OAM) and compatibility with existing technologies (e.g. spectral compatibility for copper).

  • Ethernet OAM

Ethernet OAM (Operation, Administration and Maintenance) is a set of functions designed to monitor network operation in order to detect network faults and measure its performance. Carrier-class Ethernet services require automated end-to-end management and monitoring, including OAM capabilities such as connectivity verification, fault detection, performance monitoring, and alarm indication.

  • Ethernet QoS

One of the key attributes of Carrier Ethernet services, by which the service provider offers business users bandwidth, delivery, and performance guarantees for selected traffic, and allocates the necessary network resources accordingly.