by making the processes more secure and more efficient. Mobile Mesh A wireless network implementation that uses all the nodes in the network to support communication. Because each node acts like a repeater, the greater the number of nodes, the greater the bandwidth and the better the signal that reaches the access point. mobile TV Television delivered over mobile devices. A number of standards are being pro- moted for mobile TV, including DMB, DVB-H, ISDB, and MediaFLO. mobile wireless local loop A last-mile solution that uses cellular telephone or cordless tech- nology, along with satellites. This approach enables subscriber mobility, SO it could replace a fixed line when in a home and could also be used to move outside those boundaries as a mobile line. Mobile-Fi A standard that is optimized for IP and roaming in high-speed mobile environ- ments. Also known as IEEE 802.20. mobility network A wireless network that allows a user to roam within the range of his or her home and the outdoor area surrounding it. modal dispersion The tendency of light to travel in a wavelike motion rather than a straight line. The greater the level of wave fluctuations, the greater the dispersion of the signal and the associated degradation of performance. modem (modulator-demodulator) A conversion device installed at each end of an analog communications line. The modem at the transmitting end modulates digital signals locally from a modular computer or terminal; the modem at the receiving end demodulates the incoming signal, convert- ing it back to its original (i.e., digital) format and passing it to the destination business machine. modular A design technique that permits a design or system to be assembled from inter- changeable components. A modular system or device can be expanded or modified simply by adding another module. modulation The process of converting voice or data signals for transmission over a network. Also called line coding. modulation division multiplexing A multiplexing method in which the signals that mod- ulate