REVIEW 5 QUESTIONS
Q1. List the terminal devices used with IVCS.
a.
b.
Q2. What is the purpose of the ICSC within the
IVCS?
COMMUNICATIONS SECURITY
Learning Objective: When you finish this chapter, you
will be able to—
Identify basic communications security
procedures.
Communications security is defined as the protective
measures taken to deny unauthorized persons information
derived from telecommunications of the United States
government that are related to national security and to
ensure the authenticity of each telecommunication.
Classified information may not be discussed in
telephone conversations except as may be authorized
over approved secure communications circuits. When in
doubt about the classification of information necessary to
answer a question asked in a telephone conversation, you
should say nothing. When answering a telephone on a
nonsecure communications circuit, you should inform
the caller that the telephone is nonsecure. For example:
“Quarterdeck, USS Never Sail messenger of the watch
speaking, sir this is a nonsecure telephone.”
ANNOUNCING AND
INTERCOMMUNICATION SYSTEMS
Learning Objective: When you finish this chapter, you
will be able to—
Recognize the purpose and use of the
announcing and intercommunication systems.
The general purpose of shipboard announcing and
intercom systems, circuits 1MC through 59MC, is to
transmit orders and information between stations within
the ship by amplified voice communication by either a
central amplifier system or an intercommunication
system. A central amplifier system is used to broadcast
4-13
Student Notes:
Figure 4-11.—IVCS block diagram.
