TM 55-1930-209-14&P-1Section IV. Telephone system5-14 Description. The telephone system is an intercom/paging system used for communicating between a systemoperator in the dayroom and 12 crew telephone stations. The system can also be used for communicating between crewtelephone stations. Twelve telephone stations are connected to 21 headset stations that are serviced by 14 buzzers, 3strobe lights and 10 telephone set stowage boxes. Their locations, station numbers, and equipment are listed in Table5-4.The telephone system shown in Figure 5-13 consists of the components listed in Table 5-5. Equipment specifications,maintenance information, and manufacturers' service manuals are contained in TM 55-1930209-14&P-12.5-15 Capabilities. Telephone system provides two-way conversation capability between a dayroom system operatorand crewmembers at 21 telephone headset stations or between crewmembers at these stations.5-16 Special limitations. Paging can be done only from the dayroom telephone station selector. However, after atelephone headset has been plugged into a headset station jack receptacle, a crewmember can talk through the speakerto page dayroom system operator, talk to dayroom system operator or talk to another headset station.5-17 Performance characteristicsa.Telephone power amplifierInput impedance80,000 ohms minimumOutput2 watts 24 Vdc and 16 ohmsGain32 dBb.Telephone speakerInput impedance8 ohmsc.Telephone power control modulePower input24 Vdc nominalOutput current0.5 Ad.Telephone headsetMicrophoneM-1/dc Amplified Dynamic, nominal 100 ohmsEarphoneDynamic, nominal 300 ohmsNoise capacity125 dBe.Strobe lightInput power requirement120 Vac, 50/60 HzLight output500,000 candlepower, 60 flashes/min, whitef.BuzzerInput power requirement120 Vac, 50/60 Hz5-23
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