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 special sovereignty, uninhabited islands, and other entities in addition to the traditional countries or independent states. Military is also used as an umbrella term for various civil defense, security, and defense activities in many entries. The Independence entry includes the usual colonial independence dates and former ruling states as well as other significant nationhood dates such as the traditional founding date or the date of unification, federation, confederation, establishment, or state succession that are not strictly independence dates. Dependent areas have the nature of their dependency status noted in this same entry.
Terrain
This entry contains a brief description of the topography.