the enemy's communications reflect the target's "chain of command". These commands are
targets for traffic analysis.
PART A: BASIC COMMUNICATION STRUCTURES
1. A radio terminal consists of a paired transmitter and receiver. Two or more terminals
located together is referred to as a radio station. The path of communication between two or
more radio stations is called a radio circuit. In traffic analysis, specific terms have been
adopted to describe the various types of circuits according to the manner in which the radio
stations communicate (Star, Star with lateral, and Free Operation). Communication systems
are limited to certain basic structures which aid in their exploitation. Each component part of
this structure has a specific term or definition. The terms used are "Link", "Group", "Net" and
"Network". When graphically depicting these terms, a circle, square, or rectangle is used to
represent a radio station with a straight line drawn between stations indicating communication
between the two stations.
2. The basic unit in a communication system is a "LINK". A link exists where there are two
radio stations with direct communication between each other and is graphically represented in
Figure 1-1. A communication "LINK".