User Manual

69
MN024-08
For a correct system start-up, all the remote units have to be switched
on before the master unit.
Once the Case-L Remote Unit has been switched on, its behaviour could be
checked by turning the key, removing the connector cover, and looking at the
control LEDs. When the system starts-up, their status can be summarised as
per the following steps.
1. When the remote unit is turned on, both the LEDs turn on for a
couple of seconds.
2. After that, the unit green LED remains on (thus indicating proper
power supply), while the red LED switches off as soon as the TFLN
master unit is turned on (meaning that DL optical power is OK and
no alarms are present).
3. Once the TFLN master unit has been switched on, the status of both
LEDs have to be the one reported in table 3.7 In case the red LED
remains on, please refer to the troubleshooting section.
4. Once it has been switched on, the remote unit starts working
correctly. Anyway, in order to be recognized by the supervision
management system, it is necessary for the corresponding TFLN
master optical TRX to carry out the discovery phase (please refer to
Supervision System Manual for more details). During this phase,
(whose duration depends on the system complexity, and which can
last at max. 4min) the TFLN LED ┌┘ blinks. Do not
connect/disconnect any cable or any piece of equipment
during the discovery phase! This may result in no identification
of the remote unit.
Note
: if then 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).
TFAx Case-L troubleshooting
Faults can be revealed by LEDs on the Case L front panel as well as by the
LMT software or the TSUN supervision system.
Both the LMT software and the TSUN supervision interface 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 the LMT software or the supervision system.
Britecell Plus modules are designed in order to exchange information each
other: each remote unit can receive failure notifications from their external
equipment through dry-contact connections. Moreover, each TFAx 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.
TFAx
CaseL