Prerequisites

The U2000 network management system user has the network management user privilege of "network element and its network maintainer" and above. Confirm the laser level of the OSN3500 optical power amplifier board, and understand the possible harm to human beings and the protection measures.

The boards that need to be replaced have been identified.

Impact on OSN3500 transmission network system

Replacing the SDH OSN3500 transmission equipment SSN1BA2,SSN1BPA veneer boards can cause service interruption or signal degradation if the service is not configured for protection.

Tools, Instruments, and Materials

Shielding bag, U2000 combined with network management system

Operation steps

1. Select spare parts.

Select a spare board whose veneer parameters are exactly the same as the veneer to be replaced. See Names and Characteristics for information on the parameters of the veneer.

If the veneer supports the compatible replacement function, see also Veneer Compatible Replacement to select the relevant veneer.

2. Query and record the current alarms of the single board. For details, see Browsing Current Alarms of a Network Element.

3. Query the network protection configuration. Query whether the device is configured for protection in the network management, and if it is not configured for protection, go to step 5.The following is an example of the steps for querying MSP protection.

a. In the main menu, go to "Service > SDH Protection Subnet > SDH Protection Subnet Maintenance".

b. Select an MSP protection subnet in the left table box. The status of the nodes on the protection subnet is displayed in the right table box.

c. Click Query to query the inversion status of each node.

4. If there is no inversion, start network inversion in U2000. The following is an example of MSP protection to illustrate the steps to start the inversion.

a. Right-click on the network element icon and select "Network Element Manager".

b. In the "Function Tree", select "Configuration > Ring Multiplexing Segment".

c. Select the single board that needs to be replaced, and then select "Practice Ring Reversal" in the right-click menu. The "Operation Result" dialog box pops up, click "Close".

d. Click "Query > Query Reverse Status", and the node reverse status shows "Practice Ring Reverse", which indicates that the MSP reverse is normal.

e. Query the alarms and performance events in the network management, and confirm that there are no new alarms and performance events except the alarms (such as APS_INDI) and performance events generated by the practice inversion, and the service is normal, which indicates that the inversion is successful.

f. Select the single board to be replaced, and choose "Forced Ring Inversion to Protection" in the right-click menu. The "Operation Result" dialog box pops up, click "Close".

g. Click "Query > Query Reverse Status", and the node reverse status shows "Forced Ring Reverse", which indicates that the MSP reverse is normal.

Explanation:

Forced ring reversal will be reported to APS_INDI.

5. Notify the on-site maintenance personnel to remove and replace the veneer. For details, refer to Replacing Veneer in the Field.

Description:

Unplugging the veneer will report BD_STATUS and COMMUN_FAIL, and the alarm will be automatically lifted when the new veneer comes online.

6. use the network management to lift the MSP inversion.

a. Right-click on the icon of the network element and select "Network Element Manager". b. Right-click on the icon of the network element and select "Network Element Manager". c. Select "Network Element Manager".

b. In the "Function Tree", select "Configuration > Ring Multiplexing Segment".

c. Verify that the board is working properly. Observe the indicator light (STAT) of the single board, if it is green and always on, it means the single board is working normally.

d. Select the replaced single board, in the right-click menu, select "Clear". Pop-up "operation results" dialog box, click "Close".

e. Click "Query > Query Reverse Status", and the node reverse status displays "Normal", indicating that the reverse has been lifted.

7. Verify that the single board works normally. Query the alarm of the single board and confirm that the original alarm has been lifted. Perform practice inversion to confirm that the practice inversion is normal.