Methods used to recover services after the system control board is replaced on the OSN 1800

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THE OSN 1800 does not support data downloading. Services can be recovered only by restoring database data.

Other related questions:
Methods for restoring services after replacing the system control board on the OptiX OSN 1800
The OptiX OSN 1800 device does not support data downloading. Services can be recovered only by restoring database.

Method used to test GE services provisioned when the OSN 8800 TOA board is interconnected with the OSN 1800 ELOM board
The TOA board supports Ethernet test frames for GE services but does not support the PRBS function for GE services. The ELOM board, in the contrary, does not support GE test frames. Therefore, you can only test the GE services by performing a loopback test with testers connected, or determine the GE service status by querying alarms and SNCP service path status.

Precautions for replacing the system control board in a slave subrack of the OSN 6800
Before replacing a system control board, ensure that the spare board whose board type is the same as the system control board to be replaced. In addition, ensure that battery jumper on the spare board has been correctly set.

Whether there is a method used to replace an unprotected system control board rather than using jumpers
When replacing an unprotected system control board of a master subrack, you need to use its jumpers to clear the database in its system parameter area (by setting jumpers to 1010) and in its flash memory. This database clearance prevents the NE from becoming abnormal due to a residual database after the system control board is replaced. Database clearance can only be implemented by setting jumpers onsite and cannot be implemented using the NMS. The database clearance script provided in the Downgrade Guide applies to scenarios in which the system control board is normally running. (The Downgrade Guide also applies to such scenarios in which the NE can be managed by the NMS). During system control board replacement, however, the new system control board has not been started and the NE cannot be managed yet. Therefore, commands in the database clearance script cannot be used.

Functions and replacement precautions for the system control board in an OSN 6800 slave subrack
The SCC board in a slave subrack provides the following functions: 1. Communicates with the boards without software to control the working status of the boards. 2. Receives overhead signals from service boards by using RS485A or RS485B buses and processes the overhead signals. 3. Processes the overhead signals that are transmitted from the master subrack and delivers them to the service boards. 4. Detects whether each board in a subrack is online and uses the AUX board to report the status information to the system control board in the master subrack. 5. Provides two RS485 buses for urgent data transmission. 6. Provides required power supplies for the local board and provides 3.3 V centralized power supply backup for the entire OSN 6800 system. In addition, provides power supply backup for the boards whose maximum power consumption is less than 60 W. However, it provides power supply backup only for one board at a time.

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