HF - high frequency; any radio frequency in the 3,000- to 30,000-kHz
range.

Inmarsat - International Maritime Satellite Organization (London);
provider of global mobile satellite communications for commercial,
distress, and safety applications at sea, in the air, and on land.

Intelsat - International Telecommunications Satellite Organization
(Washington, DC).

Intersputnik - International Organization of Space Communications
(Moscow); first established in the former Soviet Union and the East
European countries, it is now marketing its services worldwide with
earth stations in North America, Africa, and East Asia.

Landline - communication wire or cable of any sort that is installed on
poles or buried in the ground.

Marecs - Maritime European Communications Satellite used in the
Inmarsat system on lease from the European Space Agency.

Marisat - satellites of the Comsat Corporation that participate in the
Inmarsat system.

Medarabtel - the Middle East Telecommunications Project of the
International Telecommunications Union (ITU) providing a modern
telecommunications network, primarily by microwave radio relay, linking
Algeria, Djibouti, Egypt, Jordan, Libya, Morocco, Saudi Arabia,
Somalia, Sudan, Syria, Tunisia, and Yemen; it was initially started in
Morocco in 1970 by the Arab Telecommunications Union (ATU) and was
known at that time as the Middle East Mediterranean Telecommunications
Network.

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.

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 connec