Operation Manual

ID Name Class Severity Unit
56
Received optical
power low
0x0010 Critical FOR
Description
The received optical power on the fiber optic remote board (FOR) is less than
20 μW. This corresponds to 22 dB fiber optical loss.
NOC Actions
Investigate the loss from both ends if there is communication with the
remot
es. 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
61 Communication Failure 0x0010 Error FOR
Description
The driver for the sub-carrier Ethernet communication could not be loaded.
This is a hardware or software failure.
NOC Actions Dispatch field techs to replace unit.
Field Actions Replace unit.
ID Name Class Severity Unit
62 Laser Current 0x0010 Warning FOR
Description
The measured laser current is above the threshold of 150 mA. This is a
hardware fault.
NOC Actions Dispatch field techs to replace remote unit with spare.
Field Actions Replace remote units with spare.
ID Name Class Severity Unit
62 Laser Current 0x0010 Error FOR
Description
The measured laser current is above the threshold of 160 mA. This is a
hardware fault.
NOC Actions
Dispatch field techs to replace remote unit with spare. Check optical levels on
corresponding FOI board. Check output power.
Field Actions Replace remote units with spare.
Troubleshooting
122