4. ALARMS
4.1.
BITE AND ALARMS
The Built-In Test concept comprises the monitoring of the power supplies, the power
amplifiers and the optical interface.
All occurring alarms can be checked via software at the master unit.
4.2.
HANDLING OF ALARMS
As soon as the software acknowledges a valid alarm, a message is transmitted to the
master unit.
If the reason for the alarm has been cleared or if the alarm should continue, a new
alarm message will not be repeated. If there was an interruption of at least five
seconds after acknowledgement, a new alarm message will be generated.
4.3.
ALARM STATUS
For details refer to the corresponding software documentation of the master unit.
4.4.
STATUS LED ALARMS
For local supervision, a status LED on the connector flange of the remote unit gives
an indication of possible reasons for alarms. The position of the status LED is
illustrated in chapter
3.2.2 Connections
. This table shows possible on-site measures
that could be checked before referring to the master unit alarm list.
Status LED indication Alarms
Possible on-site measures
Green
No alarm
Status ok
Door alarm
Close the door (RUs with door).
Alarms not directly related to RU:
External alarms
Check externally connected devices.
Optical alarm Rx
Check fibre loss of optical link.
Check optical connectors.
Clean optical connectors.
(MU: Check optical output power of
corresponding OTRx at master unit).
Orange
ALC alarm
(MU: Decrease DL input power of
affected band).
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