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FAX-L350 Chapter 3: Maintenance and Service
6.1.5 Modem and NCU tests
These tests test modem and NCU transmission and reception. The modem tests check whether signals are
sent correctly from the modem by comparing the sound of the signals from the speaker with the sounds from
a normal modem. Also, on the display indicates whether or not the modem correctly detected received tone
signals and DTMF signals.
End this test by pressing the
STOP
button.
Modem test type
Overview
Frequency test
The modem sends tone signals from the modular jack and the
speaker.
G3 signal transmission test
The modem sends G3 signals from the modular jack and the
speaker.
Tonal signal reception tests
The modem detects specific frequencies and DTMF signals re-
ceived from the modular jack.
V.34 G3 signal transmission test
The modem sends V.34 G3 signals from the modular jack and the
speaker.
a) Frequency test
The frequency test menu is selected by pressing numeric button 2 from the MODEM NCU test menu.
Signals of the frequencies below are sent from the modem using the modular jack and the speaker. The
frequency can be changed with the numeric buttons.
Numeric button
Frequency
1
462 Hz
2
1100 Hz
3
1300 Hz
4
1500 Hz
5
1650 Hz
6
1850 Hz
7
2100 Hz
The pseudo-ringback tone transmission pattern and frequency and the output levels for each
frequency follow the service data transmission level settings.
NOTE
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