SOUND POWERED TELEPHONE SYSTEM - TM-55-1925-273-10-10232

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INTERNAL COMMUNICATION SYSTEMS

TM-55-1925-273-10-1 Inland and Coastal Large TUG (LT) NSN 1925-01-509-7013 (EIC XAG) Manual

Figure 1. Sound Powered Telephone System Functional Diagram

TM 55-1925-273-10-1

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Table 1. Intercom Stations (continued)

Station Number

Location

BOW THRUSTER

E.O.S.

EMGR STEERING GR.

SOUND POWERED TELEPHONE SYSTEM

The sound powered telephone system provides voice communications throughout the vessel by means of fixed phone sta-

tions and portable units. Since the system is powered by voice only, it is functional even when a loss of power occurs. There

are two circuits within the sound powered telephone system. One circuit is a dedicated line between the pilothouse and the

radio room. The other circuit provides communication throughout the LT. Refer to figure 1 for a simplified functional

diagram of the sound powered telephone system.

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