c) Line signal reception test
The line detect test menu is selected by pressing the
9
button from the faculty test menu. This test
checks the operation of the NCU signal sensor and frequency counter. In Menu 1, the CI, status can be
detected and in Menu 2 the frequency can be detected at changing detection levels. In this way, you can
check if the NCU board is correctly detecting signals.
c-1) Test Menu 1
Test Menu 1 is selected by pressing the
1
button from the Line Detect menu. When CI, is detected
from the modular jack, the display changes from OFF to ON and the received frequency is displayed.
c-2) Test Menu 2
Test Menu 2 is selected by pressing the
2
button from the Line Detect menu. When a tonal frequency
is detected from the modular jack, the display changes from OFF to ON and the received frequency is
displayed. The frequency detection level can be set with the numeric buttons.
Numeric button
Detection level (dBm)
0
–26
1
–30
2
–32
3
–35
4
–38
5
–41
6
–43
7
–45
8
–47
9
–51
c-3) Test Menu 3
Test Menu 3 is selected by pressing the
3
button from the Line Detect menu. When CNG is detected
from the modular jack, the display changes from OFF to ON.
c-4) Test Menu 4
This item is not used. Do not select it.
Chapter 3: Maintenance & Service
3-65
Содержание MultiPASS C50
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