(MAE) Metro Area Exchange: Major access points in a network in the Internet.
(MAN) Metropolitan Area Network: A communications network that covers a large portion of a city or a large campus through which two or more LANs interconnect.
(MDF) Main Distribution Frame: A unit that connects between outside plant cables and internal lines or line equipment in the central office (CO).
(MDS) Multipoint Distribution Service: A pay-TV broadcast delivery service through microwave frequencies from a fixed station to multiple small dish antennas.
(MF) Multi-Frequency: A frequency composed of two or more frequencies.
Middle-mile connection point: The "middle mile" is the network segment, provided by a different carrier, that connects geographically separated networks operated by the same company.
CLECs, Cable Operators and ISP (Internet Service Providers) use middle mile transport to connect their core network to a remote locations in order to serve additional customers. Middle mile transport is typically done with long haul fiber optical cabling or wireless backhaul.
Often nationwide carriers such as Sprint, AT&T, Level 3, Global Crossing and Qwest sell or lease portions of their network to provide middle mile connectivity.
Miles of Plant: Number of cable plant miles laid or strung by a cable system; the cable miles in
(MM) Millimeter: A unit of measure for one thousandth of a meter.
MMDS (Multi-Channel/Multi-Point Distribution System): A wireless cable service using microwaves to transmit multiple television signals to customers.
MODEM (Modulator–Demodulator): An electronic device that allows users to connect computers and other equipment in their homes, schools, or businesses to a network for the purpose of sending and/or receiving data.
(MPEG) Moving Picture Experts Group: An international group that sets standards for compressing video images.
(MPLS) Multiprotocol Label Switching: A technical description for layer 3 switching using labels of fixed-Length to quicken the pace in traffic paths.
(MSO) Multiple System Operator: A major cable TV organization that has franchises in multiple locations.
Must Carry: A policy, developed by the FCC in the 1960s and codified by Congress in 1992, requiring cable systems to carry the analog signal of a local television station if that broadcaster so chooses (see also RETRANSMISSION CONSENT). The Supreme Court voted 5-4 in 1997 to uphold must carry for analog broadcast television signals.
(MUX) Multiplexer: A device that combines many input devices into one compiled signal to be carried over one telephone line.