MTU Maximum Transmission Unit
A network (NETWORK) can send the largest packet (PACKET) size, larger than the size of the message data will be cut into several packets to pass.

Multicast Network
Multicast transmission, a message will be transmitted simultaneously to several object-specific way.

Multifrequency  Monitor
Acceptable to display several kinds of frequencies (MONITOR).

Multiplex Communications
Multi-tasking, will merge a number of signals through a transmission medium way.