a. Voice includes telephone and radiotelephone voice radio. Voice allows direct communication between
two or more individuals.
b. Telegraphy, as used in present-day tactical communications, is a method of transmitting messages in
international Morse code over radio. Continuous-wave (CW) transmissions often are the answer to problems of
distance and interference. Message rate is rather slow: 10 to 15 words per minute.
c. Teletypewriter is a rapid method of transmitting written messages over wire circuits or radio circuits.
Teletypewriters operate at a rate of 40 to 100 words per minute, depending on equipment capability and operator
skill. Most communications centers make teletypewriter service available.
d. Facsimile is a method of transmitting graphic material, such as photographs, maps, and map overlays.
Facsimile is a relatively slow way of transmitting such matter, and it takes skilled operators and high-quality
voice circuits. Normally it is employed on a point-to-point basis to meet a specific requirement.
d. Television is an electronic method of transmitting a combination of audio and graphic information. It is
virtually an instantaneous one-way system since information is transmitted at one point and received at another
simultaneously. Requiring expensive, complex terminal equipment and broadband circuits, television is a
specialized system specifically designed to meet special requirements such as visual display in a tactical
operations center.
f. Data is an electronic method of rapidly transmitting digital and analog information used primarily for fire
control, meteorological, and automatic data processing systems.
29. All electrical/electronic means carry messages or information over
paths that are called _____________________ , which interconnect a transmitting
device with one or more receiving devices.
(29. Answer: circuits)
30. Circuits installed for the common use of all authorized users of a
communication system are called common-user circuits. If the commander allo-
cates certain circuits for the exclusive use of certain individuals or certain
units, these restricted-use circuits are known as sole-user circuits. Thus
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