Enabling Objectives. Define the purpose and use of the various interior communications systems. Service Telephone System. Similar to dial telephone ashoreElectrically poweredCentral switchboardCan be connected while in-port for outside calls. Sound-powered Telephone System. Sound-poweredInstead of a battery, your voice provides the powerFailure of the electrical system has no bearing on the phonesPrimary battle telephone circuitsMeans of communication between selected battle stations on a9452
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