1-You should know number of modem slot that you want to change .
Provisioning>MODEM function setting>MODEM port setting .
2- You should see RSLs of Modem .
Metering>current Metering .
3-You should take backup of link configuration as precaution .
Equipment Utility>Export(NE->Storage) Utility > choose Equipment Config Data> Execute> keep .
-Turn off Modem (pull it and push to 0) .
-Remove IF cable .
-Replace Modem with new one .
- Insert IF cable .
-Turn Modem on .
-If any problems in crosses occurs follow the following :
Equipment Utility>Update(Storage->NE) Utility > choose Config Data> Execute> Open saved file .
-You should see RSLs .
Metering>current Metering .
-You should wait some time to monitor RSLs and make sure that link is stable .