IN_PWR_ABN

Description

The IN_PWR_ABN is an alarm indicating that the input optical power is abnormal.

Attribute

Alarm Severity Alarm Type

Major Equipment alarm

Parameters

When you view an alarm on the network management system, select the alarm. In the Alarm Details field display the related parameters of the alarm. The alarm parameters are in the following format: Alarm Parameters (hex): parameter1 parameter2...parameterN, for example, Alarm Parameters (hex): 0x01 0x08. For details about each parameter, refer to the following table.

Name Meaning

Parameter 1 Indicates the actual optical interface number of the board.

Impact on the System

When the IN_PWR_ABN alarm occurs, the service transmission performance is affected. In the case of severe alarm, the services are interrupted.

Possible Causes

The possible causes of the IN_PWR_ABN alarm are as follows:

Cause 1: The threshold of the optical power is not correct.

Cause 2: The received optical power is abnormal because of the optical connector at the local station.

Cause 3: The transmitted optical power is abnormal because of the optical connector at the opposite station.

Causes 1 of the board: The transmitting part of the opposite station is faulty.

Causes 2 of the board: The receiving part of the local station is faulty.

Procedure

Query current alarms on T2000. Determine the number of the optical interface that reports the alarm according to alarm parameter 1. For details, refer to Viewing the Current Alarms in the Supporting Tasks.

Cause 1: The threshold of the optical power is not correct.

1. Check the type of the optical module on the board. You can obtain the manufacturing information of the optical module on the board through Querying the Board Manufacturer Information Report in the Supporting Tasks or Bar Code in the Hardware Description.

2. Check whether the threshold of the optical power is set properly. For the operations, refer to Querying the Optical Power in the Supporting Tasks. If the configured threshold is not correct, reset the input lower threshold and input upper threshold according to the optical power receiver sensitivity and the overload optical power of the board. For details on the optical power specifications of the board, refer to the Technical Specifications Reference. Then, check whether the alarm is cleared.

3. If the alarm persists, see other causes.

Cause 2: The received optical power is abnormal because of the optical connector at the local station.

1. On the T2000, check whether the received optical power of the local station is within the normal range. For details on optical power specification of the board, refer to Specifications of the Boards in the Technical Specifications Reference. For details, refer to Querying the Optical Power in the Supporting Tasks.

NOTE:

Refer to Querying the Board Manufacturer Information Report in the Supporting Tasks or Bar Code in the Hardware Description, you can obtain the manufacturing information of the board optical module.

If... Then...

The received optical power is over low Proceed to the next step.

The received optical power is over high Proceed to step 2.

2. Check the fiber jumper and the optical connector.

a. Check whether the bend radius of the fiber jumper is within the normal range. If the bend radius is less than 6 cm, re-roll the fiber jumper. Then, check whether the alarm is cleared.

b. If the alarm persists, to check whether the optical connector is normal. Tighten the connector at the local station if the connector is loose. Then, check whether the alarm is cleared.

c. If the alarm persists, refer to Checking the Optical Fiber Connector in the Supporting Tasks to check whether the connectors are dirty. Clean the optical connectors at the local station in time if they are dirty. For the operations, refer to the Supporting Task:

Using the Fiber Cleaner to Clean the Optical Fiber Connector

Using the Lens Tissue to Clean the Optical Fiber Connector

Using the Dust-Free Cotton Bar to Clean the Optical Fiber Adapter

Then, check whether the alarm is cleared.

3. If the alarm persists, check whether the attenuation of the optical attenuator is proper according to the received optical power specified for the board.

If... Then...

The optical attenuation is improper

Change the attenuation to a proper value. Then, check whether the alarm is cleared. If the alarm persists, see other causes.

The optical attenuation is proper

See other causes.

Cause 3: The transmitted optical power is abnormal because of the optical connector at the opposite station.

1. On the T2000, check whether the transmitted optical power of the opposite station is within the normal range. For details on optical power specification of the board, refer toSpecifications of the Boards in the Technical Specifications Reference. For details, refer to Querying the Optical Power in the Supporting Tasks.

NOTE:

Refer to Querying the Board Manufacturer Information Report in the Supporting Tasks or Bar Code in the Hardware Description, you can obtain the manufacturing information of the board optical module.

If... Then...

The transmitted optical power is abnormal See cause 1 of the board.

The transmitted optical power is normal Proceed to the next step.

2. Check the fiber jumper connector and the optical connector.

a. To check whether the connector of the fiber is normal. Tighten the connector at the local station if the connector is loose. Then, check whether the alarm is cleared.

b. If the alarm persists, refer to Checking the Optical Fiber Connector in the Supporting Tasks to check whether the connectors are dirty. Clean the optical connectors at the local station in time if they are dirty. For the operations, refer to the Supporting Task:

Using the Fiber Cleaner to Clean the Optical Fiber Connector

Using the Lens Tissue to Clean the Optical Fiber Connector

Using the Dust-Free Cotton Bar to Clean the Optical Fiber Adapter

Then, check whether the alarm is cleared.

3. If the alarm persists, see other causes.

Cause 1 of the board: The opposite board is faulty.

1. Replace the optical module on the transmit board or the board at the opposite station. If the board supports the pluggable optical module, replace the pluggable optical module. For details, refer to Replacing a Pluggable Optical Module in the Parts Replacement. Otherwise, replace the opposite faulty board. For details, refer to Replacing Boards Onsite in the Supporting Tasks. Then, check whether the alarm is cleared.

2. If the alarm persists, replace the board. For details, refer to Replacing Boards Onsite in the Supporting Tasks. Then, check whether the alarm is cleared.

3. If the alarm persists, see other causes.

Cause 2 of the board: The board at the local station is faulty.

1. Replace the optical module on the board or the board at the local station. If the board supports the pluggable optical module, replace the pluggable optical module. For details, refer to Replacing a Pluggable Optical Module in the Parts Replacement. Otherwise, replace the local faulty board. For details, refer to Replacing Boards Onsite in the Supporting Tasks. Then, check whether the alarm is cleared.

2. If the alarm persists, replace the board. For details, refer to Replacing Boards Onsite in the Supporting Tasks. Then, check whether the alarm is cleared.

3. If the alarm persists, see other causes.

Related Information

Optical power reference value

For the input and output optical power values of various boards, see the Technical Specifications Reference.

Optical power alarm

When the board detects that the actual optical power value is lower or higher than the reference value, the alert is displayed.

The difference between the optical power value and the reference value is more than 4 dB, Critical alarm is displayed.

The difference between the optical power value and the reference value is more than 2 dB but less than 4 dB, Warning alarm is displayed.

Optical power alarm

When the board detects that the actually input optical power is higher than Reference Working Lower Threshold or lower than Reference Working Upper Threshold, the alarm indicating that the input optical power is excessively high or the alarm indicating that the input optical power is excessively low is reported.

To avoid the case wherein the actual optical power exceeds the overload optical power or optical power sensitivity, a margin can be maintained for the threshold of the alarm indicating that the input optical power is excessively high or the alarm indicating that the input optical power is excessively low.

The margin recommended in the engineering is less than 5 dB but more than 3 dB.

Set Reference Working Upper Threshold to a value 5 dB lower than the overload optical power.

Set Reference Working Lower Threshold to a value 3 dB higher than the optical receiver sensitivity.