User Manual

User’s Manual for Remote Unit
MMR8L L
Page 30 M0106ASB.doc
6.4. LED ALARMS
For local supervision, a 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.
LED Indication Alarms Possible on-site measures
Green
No alarm Æ
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 28V
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 briefly (SW version > 2.4). If not, replace
the fans at RU.
I²C Disconnect and connect mains.
Optical alarm Tx -
Red
A
mplifier “Power
Down”
(MU: Change amplifier setting at MU
controller).
LED off Mains
Check power switch inside of RU (RUs with
door).
Check mains cabling.
Check mains power.
table 6-1 LED alarms
For the position of the LED see chapter 6.4 LED Alarms.
Explicit troubleshooting is available in the MU software, (software manual or WEB
Interface).