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CHAPTER 4 SERVICE MODE
b) Frequency test
When 2 on the numeric key pad in the MODEM NCU TEST menu is pressed, the
frequency test is selected.
This test uses the telephone line connection terminal and the speaker to output the
frequency signals shown below from the modem. Changes in frequency are made using
the numeric key pad.
Numeric key pad Frequency
1 462Hz
2 1100Hz
3 1300Hz
4 1500Hz
5 1650Hz
6 1850Hz
7 2100Hz
Remarks:
Frequency and each frequency’s output level conform to the service mode’s output
level setting.
c) G3 signal transmission test
When 4 on the numeric key pad in the MODEM NCU TEST menu is pressed, the G3
signal transmission test is selected. This test uses the telephone line connection termi-
nal and the speaker to output the G3 signals shown below from the modem. Change the
output speed using the numeric key pad and then check the signals.
Numeric key pad Output speed
0 300bps
1 2400bps
2 4800bps
3 7200bps
4 9600bps
5 TC7200bps
6 TC9600bps
7 12000bps
8 14400bps
Remarks:
The output level of each signal conforms to the service mode settings.
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