User's Manual

5. Alarms
7.Manual MF0200A0A ION-U_H_17P2_uc_19-July-13.docx User’s
Manual for ION
®
U
Page 41
Status LED Indication Alarms Possible on-site measures
Green
No alarm 
Status ok
Orange
Door alarm Close the door (RUs with door).
Alarms not directly related to RU:
External alarms
Check externally connected devices.
Optical alarm Rx
Check fiber loss of optical link.
Check optical connectors.
Clean optical connectors.
(MU: Check optical output power of
corresponding OTRx at master unit).
ALC alarm
(MU: Decrease DL input power of
affected band).
Red
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 briefly (SW version > 2.4). If
not, replace the fans at RU.
I²C Disconnect and connect mains.
Optical alarm Tx -
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 5-1 Status LED alarms
figure 5-1 Alarm triggering
For the position of the status LED see chapter 4.2.2 Connections.
Explicit troubleshooting is available in the MU software, (software manual or WEB
Interface).
V1651A2
clear
Alarm LED
Alarm transmit
Alarm cause
raise
> 5 s
< 5 s
raise
> 5 s