tween They also facilitate single sign-on to access sites within a city or suburban area. different applications on corporate intranets. Mbps (millions of bits per second) leased line A transmission speed at the rate of millions Analogous to two tin cans with a string of bits in one second. Digital telephone lines between two or more sites. Organizations measure their capacity or bandwidth in bits that rent leased lines pay a fixed monthly fee per second. for the leased lines that are available exclu- media gateways sively to the organization that leases them. Contain Digital Signal Processors (DSPs) Leased lines can be used to transmit voice, that compress voice traffic to make it smaller data, or video. They are also called private or SO that it can be carried more efficiently. In dedicated lines. addition, media gateways are equipped with circuit packs with ports for connections to LEC (Local Exchange Carrier) traditional circuit-switched analog and T1 Any company authorized by the state pub- trunks. Thus, they are used to link converged lic utility commission to sell local telephone IP networks to Public Switched Telephone service. Networks. Glossary media servers differently for each type of device with which Specialized computers that play announce- they interact. ments and generate ring tones in corporate telephone systems and converged public net- millimeter wireless services works. In corporate VoIP systems, they con- Operate at microwave and higher frequen- trol call processing. cies. Millimeter refers to the very short media servers for homes (home wavelengths of high-frequency services. servers) Some next-generation mobile services are PCs or separate devices that store content, implemented on millimeter airwaves. The music, photos, movies, or TV shows that can wavelength is the distance from the highest be distributed over home networks to home or lowest point of one wave to the highest or entertainment equipment. lowest point of the next wave. mesh networks MIMO (Multiple-Input Multiple- Networks in