User Manual

86
User Manual
TFAx Case F troubleshooting
Faults can be revealed by LEDs on the Remote Unit (RU) front panel as well
as by LMT or supervision system (running on the remote supervision unit)
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.
Britecell Plus 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 3.8 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 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.
1
Note:
TFAx
CaseF
ALARM CODE
(TSUN
description)
ALARM
DESCRIPTION
ACTIVE
LED
SUPERVISION
PRIORITY
LEVEL
ACTION
RECOMMENDE
D
RELÉ
PRIORITY
LEVEL
(subrack)
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 fibre
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 band alarm
(not implemented
on TFAH 19)
HW failure on the DL
RF low band
RED CRITICAL Return the unit MAJOR
DL high band alarm
(not implemented
on TFAH 80 and
TFAH 85)
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 3.10. Description of the alarmi of the TFAx Case F Remote Unit, as they are
presented on LMT or Supervision Interface