User Guide

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Part 1: Facsimile
MultiPASS C3500/C5500 Chapter 3: Maintenance & Service
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 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.
CNG signal reception tests The modem detects specific frequencies and DTMF
signals received from the modular jack.
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 Frequency
0 Pseudo-RBT
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