Canon MultiPASS C50 Service Manual page 176

Part 1: Facsimile
6.2.6 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, you check on the display whether or not the modem correctly detected
received tone signals and DTMF signals.
End this test by pressing the STOP button.
Modem test type
Frequency test
G3 signal transmission test
CNG signal reception tests
a) Frequency test
The frequency test menu is selected by pressing the 2 button 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
0
1
2
3
4
5
6
7
NOTE
Overview
The modem sends tone signals from the modular jack
and the speaker.
The modem sends G3 signals from the modular jack
and the speaker.
The modem detects specific frequencies and DTMF
signals received from the modular jack.
Frequency
Pseudo-RBT
462 Hz
1100 Hz
1300 Hz
1500 Hz
1650 Hz
1850 Hz
2100 Hz
The pseudo-ringback tone transmission pattern and frequency and the output levels for
each frequency follow the service data transmission level settings.
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