3.4.6 MODEM, NCU test
In the test mode menu, press numeric button ‘3’ and select the MODEM, NCU test.
This test runs transmission and reception tests on the modem and NCU. In the MODEM test,
listen to the signal sounds from the speaker to check whether the signals output by
the modem are correctly transmitted. Press the STOP button to end the test.
Modem test Description
Frequency test A tonal signal is output from the modem via the telephone line connection
terminal and the speaker.
G3 signal output test A G3 signal is output from the modem via the telephone line connection
terminal and the speaker.
Tone signal reception test The modem detects particular frequencies of signals received via
the telephone line connection terminal.
a) Frequency test
In the MODEM, NCU test menu, press numeric button ‘1’ and the frequency test is selected.
In this test, the following frequencies are output from the modem via the telephone line
connection terminal and the speaker. The frequencies can be changed using the numeric buttons.
Numeric button Frequency
1 1100 Hz
2 1300 Hz
3 1500 Hz
4 1650 Hz
5 1850 Hz
6 2100 Hz
1-40
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