machine. A host computer. The use of this term is similar to "host," and "node," but "machine" connotes the machine-specific or hardware aspects of the host computer, whereas "node" connotes the logical aspects of a network host. Host denotes the relationship of the local node machine to application systems and remote hosts.
MAU. Medium attachment unit. See transceiver.
modem. A device that translates digital signals from a computer into analog signals readily transmitted over voice-grade wire and vice versa.
module. An implementation, usually in software, of a protocol or other procedure.