Operation Manual

ID Name Class Severity Unit
55 RF overload UL 0x0010 Warning FOR
Description
The RF power on the laser in the remote unit is too high. Alarm is triggered
when UL ALC hits 10 dB above set level.
NOC Actions
Check the uplink gain settings. Check the settings of the ALC. The ALC se
ttings
is set so that it should correspond to the negative FOR gain in the uplink minus
1 dB. If the FOR gain is set to 12 dB the ALC should be -13 dBm. If the FOR gain
is 20 dB the ALC should be -21 dBm
Field Actions See actions at NOC.
ID Name Class Severity Unit
56
Received optical power
low
0x0010 Warning FOR
Description
The received optical power on the fiber optic remote board (FOR) is less than
60 μW. This corresponds to 17 dB fiber optical loss.
NOC Actions
Investigate the loss from both ends, if there is communication with the
remotes. If the system is multi drop then the problem is likely to be before the
split to the different units.
Field Actions
Investigate the loss on the fiber from both ends. Using optical test equipment,
measure wave length 1550 nm downlink and 1310 nm uplink. In multi-drop
systems, the issue would likely be fiber. On point-to-point systems the remote
may be down.
ID Name Class Severity Unit
56
Received optical
power low
0x0010 Error FOR
Description
The received optical power on the fiber optic remote board (FOR) is less than
30 μW. This corresponds to 20 dB fiber optical loss.
NOC Actions
Investigate the loss from both ends if there is communication with the
remotes. If the system is multi drop then the problem is likely to be before the
split to the different units.
Field Actions
Investigate the loss on the fiber from both ends. Using optical test equipment,
measure wave length 1550 nm downlink and 1310 nm uplink. In multi-drop
systems, the issue would likely be fiber. On point-to-point systems the remote
may be down.
Fiber Distributed Antenna System (Fiber DAS)
121