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How To Change ONS 1800V Slave Subrack To Master Subrack

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Hello, everyone!

Today, I'd like to share a case with you.


Problem Description

OSN 1800 New NE 0 subrack is changed to 1 and cannot  be logged in to the subrack with the WebLCT


Problem Analysis

The frontline engineers incorrectly modified the master subrack to 1 subrack, because the master-slave subrack mode weblct can only log in to the master subrack. Therefore, you need to modify subrack ID, perform the following steps: 

1Remove two cross-connect boards from subrack 1, set sw1 on one of boards  as SW1 DIP 0111 indicates that the board forcibly set as the master subrack
2 Re-plugin the modified board into subrank1
3,Relogin with weblct after the board starts up, check the subrack's physical label, bonding it to subrack 0 and activate it. The subrank board will reboot
4 Wait until the board starts up, logging in and everything is normal, plug-out the board and reset sw1 to 0000
5 Make sure two SW1 0000 board into the subrack the newly modified and log in to the system check whether the subrack is normal. 


Root Cause

1800 only can be logged in by the master subrack. However, if an incorrect subrack ID is changed, you need to forcibly log in to the as the master subrack after changing the sw1 dip switch on the main board


Solution Description

system control and cross-connect board after forcibly set as the master subrack can be logged in normally.


That's all, I welcome everyone to leave a message and exchange in the comment area!

Thank you!


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