TRANSMISSION-ALARM/3/hwPrefecTcaAlarm_active: PreFec tca detected alarm. (IfIndex=[hwPhysicalPortIfIndex], SlotId=[hwPhysicalPortInSlot], CardId=[hwPhysicalPortInCard], PortId=[hwPhysicalPortInPort], InterfaceName=[hwPhysicalPortName])
In VS mode, this log is supported only by the admin VS.
| Parameter Name | Parameter Meaning |
|---|---|
|
hwPhysicalPortIfIndex |
Index of physical port. |
|
hwPhysicalPortInSlot |
Slot ID. |
|
hwPhysicalPortInCard |
Card ID. |
|
hwPhysicalPortInPort |
Port ID. |
|
hwPhysicalPortName |
Name of physical port. |
Cause 1: The input optical power of the optical interface is excessively high or low.
Cause 2: The optical fiber is bent heavily.
Cause 3: The optical fiber connector is unclean.
Cause 4: The optical module is installed loosely or the optical module is faulty.
Cause 5: The FEC modes of two connected boards are different.
Cause 6: The board that reports the alarm is faulty.
Cause 7: The remote board is faulty.
Cause 8: The loss and reflection of the connector between optical cables are large.
Cause 1: The input optical power of the optical interface is excessively high or low.
1. Check whether the optical power of the optical interface is abnormal.
Cause 2: The optical fiber is bent heavily.
1. Check the optical fiber. If the optical fiber is bent heavily, damaged, or aged, adjust or replace the tail fiber.
Cause 3: The optical fiber connector is unclean.
1. Check the optical fiber connector. If the optical fiber connector is dirty, clean or replace it.
Cause 4: The optical module is installed loosely or the optical module is faulty.
1. Check whether the optical module is installed loosely. If so, install it properly. If the alarm persists, replace the optical module.
Cause 5: The FEC modes of two connected boards are different.
1. Check whether the FEC modes of two connected boards are the same. If not, change them to be the same.
Cause 6: The board that reports the alarm is faulty.
1. Check whether the board that reports the alarm is faulty. If so, replace it.
Cause 7: The remote board is faulty.
1. Check whether the remote board is faulty. If so, replace it.
Cause 8: The loss and reflection of the connector between optical cables are large.
1. After the optical fiber at the peer end is disconnected, use the OTDR meter to test the local end. Check whether the loss and reflection of each link and node are normal. (The loss of a fiber splicing connector should be less than 0.3 dB, the loss of a connector should be less than 0.75 dB, and the reflection of a connector should be less than -30 dB.) If the test result is not within the required range, process the abnormal port.
2. Locate the equipment room where the port resides based on the distance between abnormal points in the OTDR test result. Preliminarily determine the port location, disconnect the port, and perform an OTDR test on the port that reports alarms. Check whether the distance is consistent with that in the previous test. If not, continue to test other ports.
3. After the abnormal port is found, test the port using a fiber microscope. If the port is dirty, clean it. For details, see Inspecting and Cleaning Optical Fiber Connectors and Adapters.
4. After the port is cleaned, restore the port, and ensure that the connector is tightened. Perform an OTDR test on the port to check whether loss and reflection of each link and node are normal.
5. If the fault persists, replace the flange and perform an OTDR test on the port that reports alarms to check whether loss and reflection of each link and node are normal.
6. If the fault persists, replace the optical fiber and perform an OTDR test on the port that reports alarms to check whether loss and reflection of each link and node are normal.
7. If multiple abnormal points exist on the link, repeat steps 2 to 6.