User's Manual Part 5

ROI-S05751 CORRECTIVE MAINTENANCE
5-3
MODEM
Unequipped:
Indicates the status of the MODEM existence.
When the MODEM is loose contact or it is not
mounted according to the “Equipment Setup”,
“Alarm” is issued.
Module:
Indicates the status of the modulator-demodulator.
When a failure occurred in the modulator-
demodulator and as a result of a LSI failure,
“Alarm” is issued.
LOF: Indicates the frame synchronization status.
When the synchronization from DMR is lost,
“Alarm” is issued,
Frame ID: Indicates the status of ID number against
MODEM of opposite station or the other channel
in Twinpath configuration. When ID number
assignment is improper, “Alarm” is issued.
High BER: Indicates the quality severe deterioration status
between radio sections. When the signal
deteriorates below the threshold preset value,
“Alarm” is issued. The settable threshold values
are: 1E-3, 1E-4 and 1E-5.
Low BER: Indicates the quality unsevere deterioration status
between radio sections. When the signal
deteriorates below the preset threshold value,
“Alarm” is issued. The settable threshold values
are: 1E-6, 1E-7, 1E-8 and 1E-9.
Early Warning:
Indicates quality deterioration status. When the
signal deteriorates below the preset threshold
level, “Alarm” is issued. (When the Early Warning
is used for protection switchover in 1+1
configuration, RX Hitless Switch is operated.) The
preset threshold level is less than 1E-9.
MOD: Indicates the operating status of the MOD. When
any failure occurs in the modulator section,
“Alarm” is issued.
DEM: Indicates the operating status of the DEM. When
any failure occurs in the demodulator section,
“Alarm” is issued.