PC-D320/PC-D340/FAX-L400 Chapter 4: Maintenance and Service4-736.6 Modem and NCU TestsThe Modem and NCU Test menu is selected by pressing the numeric button 4 from the testmode menu. These tests test modem and NCU transmission and reception. The modem testscheck whether signals are sent correctly from the modem by comparing the sound of the signalsfrom the speaker with the sounds from a normal modem. Also, you check on the displaywhether or not the modem correctly detected received tone signals and DTMF signals.End this test by pressing the Stop button.Modem test type OverviewFrequency test The modem sends tonal signals from the modularjack and the speaker.G3 signal transmission test The modem sends G3 signals from the modularjack and the speaker.Tonal signal/DTMF signal reception The modem detects specific frequencies andtests DTMF signals received from the modularjack.V.34 G3 signal transmission test The modem sends V.34 G3 signals from themodular jack and the speaker.a) Frequency testThe frequency test menu is selected by pressing the numeric button 2 from the MODEMNCU test menu. Signals of the frequencies below are sent from the modem using themodular jack and the speaker. The frequency can be changed with the numeric buttons.Numeric button Frequency1 462 Hz2 1100 Hz3 1300 Hz4 1500 Hz5 1650 Hz6 1850 Hz7 2100 Hz
