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Seaman - Military manual for the Seaman rate
Shipboard Announcing Systems
The primary battle telephone circuits provide means for  communication  between  selected  battle  stations grouped on established circuits. No dialing is necessary; when you plug in to one of these circuits, you can communicate  immediately  with  anyone  who  is  plugged in on the same circuit. Additional stations not on the circuit may be cut in by a switchboard, which also can cut out stations on the circuit if desired. Since as many as 30 stations may be on the same circuit, strict compliance with standard telephone talker's  procedure  and  terminology  is  important. Everything a talker should know may be found in Basic Military  Requirements.  As  a  watchstander,  you  must  be thoroughly  familiar  with  it. Battle telephone circuits vary in number according to  the  size  and  mission  of  the  ship.  Circuits  are designated by standard symbols, each symbol consisting of two or possibly three letters. The first letter is always J,  indicating  a  circuit  that  is  part  of  the  primary sound-powered-battle-phone  system.  The  other  letter  or letters designate a subdivision circuit of the main system, as shown in the list given in the next topic. Any subdivision of the system may be subdivided even further. In that event, each separate circuit is identified by a number before the symbol- 1JS, for example. Some circuits used exclusively for operations in a single department may have no outlets on the bridge or may have outlets that are used only in special circumstances. THE  J  CIRCUITS It is possible that not all of the circuits listed here may be installed in the ship you are serving on, but you never know when you may be transferred. For this reason, you should learn them now. Every one of the circuits listed, if it is in the ship at all, has an outlet on the bridge. Some of them are manned all the time; most of them are manned during general quarters. You must know where the outlet for each  circuit  is;  when  the  circuit  should  be  manned;  and the type of traffic it handles. The following explanation gives the standard purpose of each J circuit: The JA circuit is used by the commanding officer to communicate with his department heads and their assistants. The JC is the weapons officer's command circuit on ships  having  a  single-purpose  main  battery.  The  circuit is controlled by the weapons officer, but has a bridge outlet for use by the commanding officer and the OOD. The JF is the flag officer's circuit, controlled by the flag. When no flag is embarked, it may be used as an auxiliary  circuit. The 1JG is the air officer’s command circuit on an aircraft carrier. The captain also uses it to transmit orders  that  concern  only  the  air  department. The JL is the circuit over which the lookouts report. It is a most important channel of vital information to the bridge, CIC, and weapons control. In wartime, the JL circuit is manned under all cruising conditions. In peacetime, it is manned when circumstances require extra lookout precautions, but it may then be combined with other circuits. The controlling JL station is on the bridge,  and  the  bridge  talker  is  often  designated  as lookout  supervisor. On a ship like a destroyer having a dual-purpose main battery, the 2JC circuit serves the same purpose as the JC on a ship having a single-purpose main battery and a separate secondary battery. Ships having both circuits use the 2JC as the air defense officer's circuit. JA Captain's  battle  circuit JC Ordnance    Control J F 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 J Z Damage  control The 1JS is used as an ASW command circuit and also as a CIC dissemination circuit. When the 1JS is used as an ASW command circuit, communication links are usually found in sonar control, CIC, UB plot, and on the  bridge.  This  circuit  enables  stations  on  the communication link to exchange information without interrupting the constant flow of information on other circuits. On some ships the 1JS is used to disseminate CIC information to the conning, gunnery, and aircraft control stations. The 1JS is usually controlled by the CIC  evaluator. The  1JV, called the primary maneuvering circuit, is the one with which the Quartermasters are chiefly 2-16

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