EQUIPMENT AND SYSTEMS

Sound-Powered Telephone Tip 001
Overview

The sound-powered telephone system is the most common means of communication for DC. Requiring no external source of power, it is the primary means of communications between vital stations (Command and Control, Damage Control, Engineering, Aircraft, Weapons, and Secondary Conn).

The sound-powered telephone system is made up of five types of circuits:

• Primary
• Auxiliary
• Supplementary
• Emergency
• Miscellaneous

Primary Circuits

Primary circuits include all circuits necessary for vital battle stations.

Circuits are designated JA through JZ; for example:

• 2JZ - Main DC circuit
• 3JZ - DCRS 1/Main deck repair circuit
• 4JZ - DCRS 2/Forward repair circuit
• 5JZ - DCRS 3/After repair circuit
• 6JZ - DCRS 4/Amidships repair circuit
• 7JZ - DCRS 5/Engineer's repair circuit
• 8JZ - DCRS 7s/Flight deck repair circuit
• JA - Captain’s battle circuit
• 1JV - Maneuvering & Docking

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Auxiliary Circuits

Auxiliary circuits provide for alternate means of communications in the event of damage to the associated primary circuit. Wiring is run in separate cables installed as far as possible from the primary cables.

An auxiliary circuit is identified by a primary circuit designation - preceded by the letter "X”:

• XJA Auxiliary Captain's Battle
• X2JZ Auxiliary Damage and Stability Control
• X1JV Auxiliary Maneuvering and Docking

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Supplementary Circuits

Supplementary circuits provide communication for various battle stations and their subordinate stations for operating and service functions. They are used to enhance communications.

Examples of supplementary circuits are:

• 2JV - Engineer's circuit (Engineers)
• 3JV - Engineer's circuit (Boilers)
• 4JV - Engineer's circuit (Fuel and Stability)
• 4JV - Engineer's circuit (Fuel and Stability)
• 5JV - Engineer's circuit (Electrical)

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Emergency Circuits

Emergency circuits provide a means of rigging communication lines between vital battle stations.

Emergency circuit designations are also preceded by the letter "X", but have no letter after "J”:

• X40J - Casualty communication circuit
• X50J - AFFF Station communication circuit

The emergency circuit of main concern to DC is the X40J. The X40J circuit consists of permanent vertical riser cables installed at vital below-deck battle stations.

One 200-foot telephone cable reel is stowed in each DCRS as part of the Emergency Communication Kit. The cable can be salt and pepper or orange.

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Miscellaneous Circuits

Miscellaneous circuits include any sound-powered telephone circuit not included in the above classifications, including other interior communications circuits, announcing systems and various alarm circuits.

Sound Powered Phone Directory

The directory is comprised of seven parts:

• Part I - Alphabetical list
• Part II - Ship control circuits
• Part II - Ship control circuits
• Part IV - Weapons control circuits
• Part V - Primary flight control circuits
• Part VI - Manning circuits under various conditions
• Part VII - Listing of Sound-Powered Telephone Circuit X40J communications between subdivisions on the DC deck when ZEBRA is set

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The information above is also available in PowerPoint format.

• View Sound Power (SP) Telephone System PowerPoint

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