Canon multipass c3000 Service Manual (en)

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c) CNG and DTMF signal reception tests
The CNG and DTMF signal reception test is selected by pressing the 
6
button from the
MODEM NCU test menu.  In these tests, you can check whether the CNG signals and
DTMF signals received from the modular jack are detected by the modem.
Chapter 3: Maintenance & Service
3-51
Press the STOP button to end the test.
2nd received DTMF "2"
is displayed.
4-6: TONE RX
0 OFF    NO ENERGY
0 OFF
9
0 ON
92
The received DTMF "9"
is displayed.
The CNG is not
detected.
The CNG is
detected.
Detection Level
alternately
displayed
Figure 3-30 CNG and DTMF Signal Reception Tests