Andrew ION-B Series, Руководство пользователя

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94 ION-B User Manual
TFAM
Case F
Both LMT and Supervision System provide full information about the device causing the alarm.
As a consequence, troubleshooting procedure can be very immediate when the failure
detection is directly carried out through LMT or Supervision System.
ION-B modules are designed in order to exchange information each other: each RU
constantly monitors the optical signal received from its TFLN unit, so as to control optical losses.
Table 3.6.2 shows a brief description of the alarms related to a Case L Remote Unit, with a
reference to the corresponding alerted LEDs and to the actions to be carried out in the case
of a fault.
As this table shows, not all the alarms are revealed by the LEDs placed on the Remote Unit
control panel: in fact, LEDs reveal only major alarms (i.e., the high priority ones), whereas the
minor alarms (i.e., the low priority ones) are revealed only by the LMT software or through the
TSUN Supervision System. The minor alarms usually detect critical situations which should be
checked so as to avoid future possible system faults.
Note:
Each Remote Unit is provided with an AGC system which comes in after the optical-to-RF
conversion. This AGC can correctly compensate optical losses when these are estimated to
be <3.5 dB. In case optical losses are > 3.5dB, the LMT application and the ION-B supervision
unit will display a “Warning” alarm: the whole system still work, but AGC is near to its borderline
ALARM CODE
(TSUN description)
Alarm Description Active
LED
Supervision
Priority Level
Action
Recommended
RELE’ Priority
level
DL optical power
The DL received optical
power is too low and
can no more be
compensated by AGC 1
RED MAJOR
Check the DL fi bre
and the TFLN laser
status
MAJOR
AGC out of range
The DL received optical
power experiences
a loss > 3dB, which
nevertheless can still be
compensated 1
NONE
WARNING
Clean optical
connectors
MINOR
DL low alarm in Band 1
HW failure on the DL RF
low band
RED CRITICAL Return the unit
MAJOR
DL high alarm in band 2
HW failure on the UL RF
low band
RED CRITICAL
Return the unit MAJOR
Power supply alarm
UPS HW failure or
malfunction.
RF is turned OFF
RED MAJOR Return the unit MAJOR
Internal BUS alarm
A malfunctioning on
the digital part involves
a fault in monitoring
functionalities
RED CRITICAL Return the unit MAJOR
Temperature alarm Over-temperature alarm NONE MINOR
Check ventilation
and environment
MINOR
Table 3.6.2 (a): Description of the alarms of the TFAx Case F Remote Unit,
as they are reported by LMT application or Supervision Interface.