microwave radio relay—transmission of long distance telephone calls and television programs by highly directional radio microwaves that are received and sent on from one booster station to another on an optical path.
NMT—Nordic Mobile Telephone; an analog cellular telephone system that was developed jointly by the national telecommunications authorities of the Nordic countries (Denmark, Finland, Iceland, Norway, and Sweden).
Orbita—a Russian television service; also the trade name of a packet—switched digital telephone network.
radiotelephone communications—the two-way transmission and reception of sounds by broadcast radio on authorized frequencies using telephone handsets.
satellite communication system—a communication system consisting of two or more earth stations and at least one satellite that provides long distance transmission of voice, data, and television; the system usually serves as a trunk connection between telephone exchanges; if the earth stations are in the same country, it is a domestic system.
satellite earth station—a communications facility with a microwave radio transmitting and receiving antenna and required receiving and transmitting equipment for communicating with satellites.
satellite link—a radio connection between a satellite and an earth station permitting communication between them, either one-way (down link from satellite to earth station—television receive-only transmission) or two-way (telephone channels).
SHF—super-high-frequency; any radio frequency in the 3,000- to 30,000-MHz range.
shortwave—radio frequencies (from 1.605 to 30 MHz) that fall above the commercial broadcast band and are used for communication over long distances.
Solidaridad—geosynchronous satellites in Mexico's system of international telecommunications in the Western Hemisphere.