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 TM 55-1905-223-SDC
Section VI. LS-519A/SIC INTERCOMMUNICATION SYSTEM
4-12. INTRODUCTION. The LS-519A/SIC Intercommunication system has a capacity for 20 stations. Ten
stations are presently being used which allow 10 stations for future expansion. The 10 stations in use are at
the following locations:
Pilothouse
Master Stateroom
Chief Engineer Stations
Galley
Recreation Room
Sick Bay
Bowthruster Compartment
Machine Shop
Engineer Operating Station
Steering Gear Compartment
Each unit contains all necessary equipment to provide two-way voice communication between any two
stations simultaneously. The system is powered by 115 Vac, 60Hz, single phase power.
The controls on each LS-519A/SIC master station consist of:
a. Two 10-pushbutton station selector switch assemblies which are used to call the desired station.
b. A microphone or headset connector if either is to be used.
c. A HANDSFREE/NORMAL/PRESS-TO-TALK switch. The HANDSFREE position allows the operator to
talk and listen without pushing the switch to the PRESS-TO-TALK position.
d. A VOLUME control switch for incoming loudspeaker audio.
e. A DIMMER switch for illumination control.
f. A release (REL) lamp, CALL lamp, and a BUSY lamp.
There are also several remote loudspeaker (talk back) stations. These stations consist of loudspeakers,
talk switches, and busy indicators. Each remote talk back speaker is connected to only one master station
and not to the entire intercom network. If a communication is initiated from the master station, the remote
operator replies hands free. If the communication is initiated from the remote loudspeaker station, the
remote talk switch must be maintained in the talk position to receive the reply from the master station, unless
the master station operator operates the selector switch for the calling station.
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