on calls
(01 is for calls other than station-to-station calls),
[34] is the country code for Spain,
(1) is the city code for Madrid,
577 is the local exchange, and
xxxx is the local telephone number.
An international direct dial telephone call placed from another
country to the US would be as follows:
international access code + [1] (202) 939-xxxx, where
[1] is the country code for the US,
(202) is the area code for Washington, DC,
939 is the local exchange, and
xxxx is the local telephone number.
Telephone system: This entry includes a brief characterization of the
system with details on the domestic and international components. The
following terms and abbreviations are used throughout the entry:
Arabsat-Arab Satellite Communications Organization (Riyadh,
Saudi Arabia).
Autodin-Automatic Digital Network (US Department of Defense).
CB-citizen's band mobile radio communications.
cellular telephone system-the telephones in this system are
radio transceivers, with each instrument having its own private radio
frequency and sufficient radiated power to reach the booster station
in its area (cell), from which the telephone signal is fed to a
regular telephone exchange.
Central American Microwave System-a trunk microwave radio
relay system that links the countries of Central America and Mexico
with each other.
coaxial cable-a multichannel communication cable consisting
of a central conducting wire, surrounded by and insulated from a
cylindrical conducting shell; a large number of telephone channels can
be made available within the insulated space by the use of a large
number of carrier frequencies.
Comsat-Communications Satellite Corporation (US).
DSN-Defense Switched Network (formerly Automatic Voice
Network or Autovon); basic general-purpose, switched voice network of
the Defense Communications System (US Department of Defense).
Eutelsat-European Telecommunications Satellite Organization
(Paris).
fiber-optic cable-a multichannel communications cable using a
thread of optical glass fibers as a transmission medium in which the
signal (voice, video, etc.) is in the form of a coded pulse of light.
HF-high-frequency; any radio frequency in the 3,000- to
30,000-kHz range.
Inmarsat-International Mobile Satellite Organization
(London); provider of global mobile satellite communications for
commercial, distress, and safety applications at sea, in the air, and
on land.
Intelsat-I
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