NSCC SEAMAN MODULE TWO INTERIOR COMMUNICATIONS

1
NSCC SEAMAN MODULE TWOINTERIOR COMMUNICATIONS

• By ENS MATTHEW LANDRY, NSCC
• USS JOSEPH P KENNEDY, JR (DD 850) DIVISION

FOR USE WITH CHAPTER 2, PAGES 2-15 TO 2-19 OF
NAVEDTRA 14067
2
Enabling Objectives

• Define the purpose and use of the various
  interior communications systems

3
Service Telephone System

• Similar to dial telephone ashore
• Electrically powered
• Central switchboard
• Can be connected while in-port for outside calls

4
Sound-powered Telephone System

• Sound-powered
• Instead of a battery, your voice provides the
  power
• Failure of the electrical system has no bearing
  on the phones
• Primary battle telephone circuits
• Means of communication between selected battle
  stations on a circuit
• No dialing is necessary

5
Sound-powered Circuits

• Always begin with J
• Second letter is a subdivision of the circuit
• All major circuits have an outlet on the bridge!
• Example Common circuits

JA Captain's battle circuit JC Ordnance
Control JF Flag officer 1JG Aircraft
control JL Battle lookouts 2JC Dual-purpose
battery control 1JS Sonar control 1JV
Maneuvering, docking, and catapult control JW
Ship control rangefinders JX Radio and
signals JZ Damage control
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Shipboard Announcing Systems

• 1MC General announcing circuit, word passed
  throughout the ship
• Contains switches to cut out certain parts of the
  ship
• Other one-way announcement circuits
• 2MC Engineering
• 3MC Hangar deck
• 6MC Intership (bullhorn)

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Squawk Boxes

• Two-way communication
• Electrically powered
• Raises noise level in the space
• Not used when phones manned