MAAP

maintenance & administration panels

MACSTAR

multiple access customer station rearrangement

MAC

media access control or moves, adds, and changes

Main Cross-Connects

In a premises distribution system, main cross-connects are the cross connects located in an equipment room.

MAN

metropolitan area network

MCU

mobile control unit

Media

See transmission medium; yielded media; unguided media.

Message Telecommunications Service (MTS)

MTS is a non-private-line intrastate and interstate long-distance that uses in whole or in part the public switched telephone network (PSTN).

MFJ

Modification of Final Judgment

MFOTS

Military Fiber-Optic Transmission System

MF

multiple frequency

MHS

message handling system

MIB

management information base

MIC

Material Identification Code

Microwave

In telecommunications, microwaves are frequencies above 1 GHz.

MIPS

million instructions per second

Modems (MOdulator/DEModulators)

Modems are devices that transform digital signals generated by data terminal equipments (DTEs) to analog signal formats, suitable for transmission through the extensive, world-wide connectivity of public and private, switched (dial up) and non-switched telephone voice networks.