Previously known as the Metropolitan Ethernet Forum. See http://www. mef. net/

Mdia GAteway Control

A unit of frequency denoting one million (106) Hz.

1. All of the addressable storage space in a processing unit and other internal memory that is used to execute instructions.
2. Loosely, the volatile, main storage in computers. See random access memory.

The collection of residual information from data storage. [INFOSEC-99]

Metro-Ethernet Network

A displayed list of options from which a user selects actions to be performed.

Abbreviation for medium Earth orbit. An orbital path configuration, between altitudes of 8,000 and 20,000 km, used by communication satellites that provide communications capabilities for such services as cellular telephone communications and GPS (global positioning system) signals. Classification Orbital Altitude (km above the Earth) LEO 500-2,000 MEO 8,000-20,000 Geostationary orbit 35,786

Acronym for merchant-ship broadcast system.

A maritime shore-to-ship broadcast system in which the ocean areas are divided into primary broadcast areas each covered by a high-powered shore radio station that broadcasts simultaneously on one medium frequency (MF) and one or more high frequencies (HF) for routing messages to ocean-going ships.
Note: In some instances, coast stations may repeat the messages. [From Weik '89]