User Manual

36
User Manual
Do not connect/disconnect any cable or any piece of
equipment during the discovery phase! This may result in failing
the identification of the remote unit.
Note
: in case discovery doesn’t start automatically, check through the LMT or
the remote supervision whether it has been disabled (refer to LMT or remote
supervision system manuals for further information).
Case A TFAx troubleshooting
Faults can be revealed by LEDs on the TFAx 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 failure detection is directly carried out through LMT or
supervision system.
Britecell Plus modules are designed in order to exchange information, so that
each remote unit can receive failure notifications from its external equipment
through dry-contact connections. Moreover, the TFAx constantly monitors the
optical signal received from its TFLN unit to control optical losses.
Tables 3.2 and 3.3 show a brief description of the alarms related to a Case A
remote unit, with a reference to the corresponding alerted LEDs and to the
actions to be carried out in the case of a fault.
TFAN
ALARM
CODE
(TSUN
description)
ALARM
DESCRIPTION
ACTIVE LED
SUPERVISION
PRIORITY
LEVEL
ACTION
RECOMMENDED
RELÉ
PRIORITY
LEVEL
(subrack)
Antenna DC
loop alarm
ALWAYS OK
DL optical
power fail
The optical power
received on the DL is
too low and can’t no
more be
compensated
RED MAJOR
Check the DL fibre
and the TFLN laser
status
MAJOR
AGC out of
range
The optical power
received is under the
allowed 3dB optical
loss but it can be
compensated
NONE WARNING
Clean optical
connectors
MINOR
DL RF low
band alarm
HW failure on the DL
low band RF section
RED CRITICAL Return the unit MAJOR
DL RF high
band alarm
HW failure on the DL
high band RF section
RED CRITICAL Return the unit MAJOR
External 1
alarm
Alarm on the device
connected on dry-
contact 1
RED MAJOR
Check the external
device or alarm
connection
MAJOR
External 2
alarm
Alarm on the device
connected on dry-
contact 2
RED MAJOR
Check the external
device or alarm
connection
MAJOR
TFAx
CaseA
Table 3.2. Description of the alarms of the TFAN Case A Remote Unit, as they are
presented on LMT or Supervision Interface