e; 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.
PanAmSat - PanAmSat Corporation (Greenwich, CT).
SAFE - South African Far East Cable
satellite communication system - a communication system consisting
of two or more earth stations and at least one satellite that provide
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.
Statsionar - Russia's geostationary system for satellite
telecommunications.
submarine cable - a cable designed for service under water.
TAT - Trans-Atlantic Telephone; any of a number of high-capacity
submarine coaxial telephone cables linking Europe with North America.
telefax - facsimile service between subscriber stations via the
public switched telephone network or the international Datel network.
telegraph - a telecommunications system designed for unmodulated
electric impulse transmission.
telex - a communication service involving teletypewriters
connected by wire through automatic exchanges.
tropospheric scatter - a form of microwave radio transmission in
which the troposphere is used to scatter and reflect a fraction of the
incident radio waves back to earth; powerful, highly directional
antennas are used to transmit and receive the microwave signals;
reliable over-the-horizon communications are realized f