MC - Abbreviation for megacycle.
MCM - Abbreviation for one thousand (1,000) circular mils, e.g., 500 MCM = 500,000 circular mils.
MECHANICAL SPLICE - A fiber splice accomplished by fixtures or materials, rather than by thermal fusion. Index matching material may be applied between the two fiber ends.
MEDIUM FREQUENCY - See frequency band.
MEGA - A prefix to a unit, denoting a multiple of one million (1,000,000) of that unit.
MEGAHERTZ - One million (1,000,000) cycles per second. Abbreviation MHz.
MEGAWATT - One million (1,000,000) watts. Abbreviation MW.
MELAMINE - A thermosetting resin chemically known as melamine formaldehyde. It has excellent resistance to acids and alkalies and good resistance to water and solvents. Has high strength, high insulation resistance as compared to plastics.
MESA - Abbreviation for Mining Enforcement and Safety Administration. Formerly PBM (Pennsylvania Bureau of Mines).
MESSENGER - The linear supporting member, usually a high strength steel wire, used as the supporting element of a suspended aerial cable. The messenger may be an integral part of the cable or exterior to it.
METER - The unit of length defined as the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second. One meter equals 39.3701 inches. Abbreviation m.
MF - Abbreviation for medium frequency. See frequency band.
