User's Manual

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. 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).
Alarms directly related to RU:
Power 28 V
Change power supply (RUs with door).
Replace the affected remote unit.
Temperature
Reduce environmental temperature.
Eliminate thermal short circuit.
Fan
Disconnect and connect mains. Fans
should run. If not, replace the fans at
RU.
I²C Disconnect and connect mains.
Optical alarm Tx Exchange RU.
Red
A
mplifier “Power
Down”
(MU: Change amplifier setting at MU
controller).
Status LED off Mains
Check power switch inside of RU (RUs
with door).
Check mains cabling.
Check mains power.
table 4-1 Status LED alarms
For the position of the status LED see chapter 3.2.2 Connections.
Explicit troubleshooting is available in the MU software (software manual or WEB
Interface).