ation - 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 for distances up
to 600 miles in a single hop; additional hops can extend the range of
this system for very long distances.

trunk network - a network of switching centers, connected by
multichannel trunk lines.

UHF - ultra high frequency; any radio frequency in the 300- to
3,000-MHz range.

VHF - very high frequency; any radio frequency in the 30- to 300-
MHz range.

Telephones - main lines in use
This entry gives the total number of main telephone lines in use.

Telephones - mobile cellular
This entry gives the total number of mobile cellular telephones in use.

Television - broadcast stations
This entry gives the total number of separate broadcast stations plus
any repeater stations.

Televisions
This entry gives the total number of television sets.

Terminology
Due to the highly structured nature of the Factbook database, some
collective generic terms have to be used. For example, the word Country
in the Country name entry refers to a wide variety of dependencies,
areas of specia