Management System
70 EN/LZT 712 0050 R1A
9.7.2 Alarm Severity
Alarms are divided into different severity levels depending on how they
affect the traffic, see the table below.
Table 2: Alarm severity
Severity Terminal status
Minor An alarm that does not affect the traffic
Major An alarm that may cause a traffic disturbance
Critical An alarm that affects the traffic
Minor alarms are related to malfunctions that do not affect the traffic.
Major alarms are generated when a function is unable to perform a
required action. This may cause a disturbance in the traffic.
Critical alarms affect the traffic and should be attended to
immediately.
Depending on the terminal configuration, the alarm severity for an
alarm can vary. For example, Loss of Signal (LOS) or Loss of Frame
(LOF) conditions from radio side are Critical for a 1+0 configuration
and Major for a 1+1 configuration depending on which transmit/receive
chain is active.
9.7.3 Alarms
The alarm information from the terminal includes the name of the
alarm, the severity of the alarm, a time record, the board where the
alarm is located and its slot number.
The tables below show the alarms that can be reported from the
MINI-LINK High Capacity terminal.
Table 3: Alarms from the TRU
Alarm Description Severity
L2R LOS TRU Loss of input main traffic signal to the TRU Critical
L2R LOF TRU Loss of frame in input main traffic signal to
the TRU
Critical
R2L LOS A TRU Failure in the traffic signal coming from the
MMU A to the TRU
(1+0): Critical
(1+1): Major
R2L LOS B TRU Failure in the traffic signal coming from the
MMU B to the TRU
Major
RX CLK A R2L Loss of clock signal coming from MMU A (1+0): Critical
(1+1): Major
RX CLK B R2L Loss of clock signal coming from MMU B Major
TX CLK L2R Line to radio PLL circuitry not working, due to
clock failure
Critical
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Alarm Description Severity
TX CLK R2L Radio to line PLL circuitry not working, due to
clock failure
Critical
TRU unit fail A hardware failure in the TRU Critical
MS AIS L2R AIS is detected on the incoming traffic from
the line side
Critical
MS AIS R2L AIS is detected on the received traffic signal
from the radio side
Critical
B1 SD R2L The BER (Bit Error Rate) for the received
signal, calculated on B1 byte of RSOH, has
exceeded the BER alarm threshold. The BER
alarm threshold level can be set in the range
BER 10-5 - 10-9
Major
TIM radio side Trace Identifier Mismatch on the radio side –
incorrect C1/J0
Critical
TIM line side Trace Identifier Mismatch line side – incorrect
C1/J0
Critical
I/O # alarm Alarms from user defined I/O ports User defined
WST LOS R2L Loss of wayside traffic from MMU Minor
WST LOS L2R Loss of wayside traffic on the line side Minor
Laser Tx fail Failure in the transmitting functionality on the
optical line interface
Critical
Laser Tx degraded Degradation in the transmitting functionality
on the optical line interface
Minor
B1 unavailable period Unavailability status Critical
B1 ES 15 min
threshold crossing
ES counter has exceeded the threshold level
in the 15 min. window
Minor
B1 SES 15 min
threshold crossing
SES counter has exceeded the threshold
level in the 15 min. window
Major
B1 BBE 15 min
threshold crossing
BBE counter has exceeded the threshold
level in the 15 min. window
Major
B1 ES 24 h threshold
crossing
ES counter has exceeded the threshold level
in the 24 h window
Minor
B1 SES 24 h threshold
crossing
SES counter has exceeded the threshold
level in the 24 h window
Major
B1 BBE 24 h threshold
crossing
BBE counter has exceeded the threshold
level in the 24 h window
Major
Table 4: Alarms from the MMU
Alarm Description Severity
LOS L2R MMU Loss of incoming signal from TRU at the
modulator
(1+0): Critical
(1+1): Major
LOF L2R MMU Loss of frame at the modulator (1+0): Critical
(1+1): Major
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72 EN/LZT 712 0050 R1A
Alarm Description Severity
IF LOS L2R Loss of signal at the IF block (1+0): Critical
(1+1): Major
TX clock fail L2R Loss of clock at the modulator (1+0): Critical
(1+1): Major
IF LOS R2L Loss of incoming signal from the radio at the
demodulator
(1+0): Critical
(1+1): Major
LOF R2L Loss of frame at the demodulator (1+0): Critical
(1+1): Major
Clock fail R2L MMU Loss of clock at the demodulator (1+0): Critical
(1+1): Major
R2L carrier recovery
LOS
Loss of the carrier at the demodulator (1+0): Critical
(1+1): Major
Early warning R2L Early Warning alarm. BER is in the range
10-11<EW≤10-8
Minor
Low BER R2L Low BER alarm. BER ≥10-6 Major
High BER R2L High BER alarm. BER >10-4 (1+0): Critical
(1+1): Major
Excessive BER Signal Fail - BER ≥10-3 (1+0): Critical
(1+1): Major
Cable alarm Radio cable disconnected (1+0): Critical
(1+1): Major
MMU unit fail A hardware failure in the MMU (1+0): Critical
(1+1): Major
L2R LOS WST Loss of Wayside Traffic from the TRU to the
MMU
Minor
Table 5: Alarms from the RAU
Alarm Description Severity
RAU unit fail A hardware failure in the RAU (1+0): Critical
(1+1): Major
TX IF LOS RAU
(RxIFC)
Loss of received IF signal coming from the
MMU to the RAU
Major
RF output level A major degradation of transmitter RF output
level
(1+0): Critical
(1+1): Major
RF IN LOS RAU Low received power level to the RAU from
the far-end terminal (detected in MMU)
(1+0): Critical
(1+1): Major
RAU high temperature
alarm
The temperature exceeds the threshold level
in the RAU unit
Major
RX AFC limit RAU AFC frequency limit reached Major
TX frequency TX PLLs frequency failure (1+0): Critical
(1+1): Major
RX frequency RX PLLs frequency failure (1+0): Critical
(1+1): Major
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Table 6: Alarms from equipment
Alarm Description Severity
FAN alarm Alarm from the fan unit Major
IDU high temperature
alarm
One of the indoor unit has exceeded the
allowed operation temperature limit
Major
Card absence in slot#2 Card absence in slot 2 TRU in slot#1:
Critical
TRU in slot#3 and
1+1: Major
Card absence in slot#4 Card absence in slot 4 TRU in slot#3 and
1+0: Critical
TRU in slot#3 and
1+1: Major
Card mismatch in
slot#1
Incorrect board in slot 1 TRU in slot#1:
Critical
Card mismatch in
slot#2
Incorrect board in slot 2 TRU in slot#1:
Critical
TRU in slot#3 and
1+1: Major
Card mismatch in
slot#3
Incorrect board in slot 3 TRU in slot#3:
Critical
Card mismatch in
slot#4
Incorrect board in slot 4 TRU in slot#3 and
1+0: Critical
TRU in slot#3 and
1+1: Major
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