Procedure

1. Select the spare. Select a spare board whose veneer name, version, and model are exactly the same as the veneer to be replaced.
2. Query and record network element alarms.
   1. Select " Monitor > Alarms > Current Alarms " in the main menu .
   2. Click "Filter" to set the filter conditions for current alarms.
   3. Click "OK".
   4. The current alarm of the network element is recorded.
      

      Select Partial Alarms or All Alarms, and choose Export > Export Selected orExport> All to record the current alarms of the network element.

3. Enable the prompt of unplugging the board to be replaced on the network management.
   1. Select the network element in "Element Manager", and then select " Configuration > Board Removal Alert " in the function tree .
   2. Select the board you want to set, double click "Enable prompt", and set it to "Enable".
   3. Click "Apply".
   4. Click "Query" to confirm that the query result is consistent with the configuration.
      

      After enabling the prompt for unplugging the board, the field maintenance personnel can see the board indicator flashing green slowly, which is convenient for locating the board to be replaced.

4. Check whether the single board to be replaced is configured with service protection.
   

   If you force the reversal of a single board that is not configured with service protection or if you fail to perform the protection reversal operation, it will cause all the services on the single board to be interrupted.

5. Notify the on-site maintenance personnel to remove and replace the veneer to be replaced.
6. Replace the veneer. If the veneer to be replaced is a TPS veneer as a whole or a DMS veneer, perform 7, 8, and 9. If the veneer to be replaced is a PD1 veneer, perform 7 and 9.
   

   The TPS veneer supports TPS 1:1 protection, which is a protection configuration for processing board PD1. Replacing the TPS veneer as a whole or the DMS veneer involves replacing the interface board DMS, which results in the interruption of services passing through that veneer.

7. Unplug the PD1 veneer from the DMS veneer.
   1. Wear a well-grounded antistatic wrist strap. The anti-static wrist strap should be in good contact with the skin and the plug of the anti-static wrist strap should be inserted into the ESD jack on the box.
   2. Use a screwdriver to loosen the screws at the left and right ends of the veneer puller.
   3. Hold the pull handles with a smooth force and slowly pull out the veneer.
      Figure 1 Pulling out the veneer
      
      
   4. If the veneer to be replaced is a TPS veneer as a whole or a PD1 veneer, put the replaced PD1 veneer into an anti-static bag and stick a maintenance label on the anti-static bag to record the name of this network element and the fault phenomenon, etc. If the veneer to be replaced is a DMS veneer, put the replaced PD1 veneer into the anti-static bag and install it on the new DMS veneer.
8. To replace the DMS veneer board, refer to Replacing the Veneer Board for details.
9. Insert the new PD1 veneer board.
   1. Check the backplane connector with a flashlight to make sure there are no backwards pins.
   2. Check that the veneer connectors are intact.
      Figure 2 Schematic of broken connector
      
      
   3. Gently push the PD1 veneer board into the corresponding DMS veneer board connector, pushing the pull handle of the veneer board slightly harder until the veneer board is fully inserted into the connector.
      Figure 3 Inserting the veneer
      
   4. Tighten the screws at the left and right ends of the veneer puller.
   

   • During the veneer replacement process, a software synchronization process will occur for several minutes, at which time the veneer PROG light is green and continues to flash rapidly. When the PROG light is green, it means the software synchronization is completed.
   • After the replacement of the single board, the host software will automatically send down the configuration information of the original single board.
10. Check the STAT indicator of the replacement veneer. It takes 5 minutes for the new veneer to work normally from the time it is plugged in, and the veneer indicator should be green at this time. If the indicator light is abnormal you need to unplug the board again or replace the board again.
11. If you have enabled the unplugging prompt before replacement, you need to enable the unplugging prompt in the network management after the replacement is completed.
    1. Select the network element in "Element Manager", and then select " Configuration > Unplug prompt " in the function tree .
    2. Select the board you want to set, double click "Enable prompt", and set it to "Disable".
    3. Click "Apply".
    4. Click "Query" to confirm that the query result is consistent with the configuration.
12. Use NCE to check the alarms and performance events of the local network element and the peer network element, and confirm that the alarms and performance events in 2 have all been cleared.