TM 55-1930-209-14&P-12 Table 4-1.  Telephone System Major Components Component /Quantity Location Function Telephone power Mounted in station Amplifies calls from handset amplifier/1 selector box on aft station so they can be heard at (M3131) bulkhead in dayroom the headset stations Telephone speaker/1 Located above operator's For converting signals from (801-401) desk in dayroom headset stations into sound Telephone power control Mounted in station Acts as regulator between module/1 selector box on aft power source and power (M3116) bulkhead in dayroom amplifier Telephone station Mounted on aft bulkhead For selecting telephone station selector box/1 in dayroom (12 stations) to alert crew personnel by activating buzzer or strobe light, for controlling telephone power amplifier volume and for turning on/off 24 Vdc to telephone system Telephone headset/15 Stored in the ROWPU Allows crew personnel to (H3342) space aft storage area receive incoming calls from system operator and transmit messages (talk-back) when connected to associated headset station jack receptacle Telephone station Mounted throughout barge Alerts crew personnel at buzzer/14 near headset stations headset station that they are (1C/Z154) being paged Telephone station strobe Mounted on overhead In Alerts crew personnel at light/3 center of ROWPU space headset station that they are (6850-138) and in void 4 port and starboardbeing paged Telephone indoor Mounted in dayroom, Allows crew personnel to plug in headset station/1 4 workshop, ROWPU space, telephone headset and (M3141) and each void communicate with dayroom system operator or another headset station Telephone outdoor Mounted on weatherdeck Allows crew personnel to plug in headset station/7 in 5 stowage boxes and telephone headset and (M3141) on top of deckhouse In communicate with dayroom two watertight boxes system operator or another headset station Operator telephone Mounted on operator's Allows messages to be sent to handset station/i desk in dayroom and received from crew (WE-2) telephone stations Telephone headset 2 on weatherdeck forward For stowing headsets at stowage box/10 1 In dayroom telephone stations (10444-003) 1 In ROWPU space (Barges 2 and 3) 1 in void 4 starboard 1 on weatherdeck starboard (fuel oil fill) 2 on weatherdeck aft 2 on deckhouse top Handset adapter Dayroom Permits connection of telephone module/1 (M3146) handset to telephone system 4-3