Planning principles and usage precautions for OSN 9800 subracks configured in master-slave mode

For OSN 9800 U64/U32 subrack:
The master and slave subracks are cascaded through GE1 or GE2 ports on the CTU boards and NEs are interconnected through NM ports.
Both the active and standby CTU boards in a subrack need to be connected to the two CTU boards in another subrack. Only CTU boards in the same-numbered slot (IU70 or IU78) in the two subracks can be connected.
For OSN 9800 P18 subracks:
The master and slave subracks are cascaded through ETH1 or ETH2 ports on the AUX boards and NEs are interconnected through NM_ETH1 or NM_ETH2 ports.
For OSN 9800 universal platform subracks:
The master and slave subracks are cascaded through ETH1, ETH2, or ETH3 ports on the EFI boards and NEs are interconnected through NM_ETH ports.
The OSN 9800 P18 subracks can be cascaded with OSN 9800 universal platform subracks in tree-like structure and ring-like structure.
For OSN 9800 U64/U32 subracks:
The CTU boards in a subrack must be configured in 1+1 redundancy mode.
The CTU boards in the master and slave subracks must have the same software version.
An NE consisting of only one subrack cannot be smoothly reconstructed into an NE using master and slave subracks.
A slave subrack cannot be smoothly reconstructed into a master subrack.
Only master subracks support packet features.
For OSN 9800 P18 subracks:
1+1 redundancy is recommended for the system control boards in a master subrack.
When an OSN 9800 P18 subrack is used as a slave subrack, no SCC boards need to be configured.
An NE consisting of only one subrack cannot be smoothly reconstructed into an NE using master and slave subracks.
A slave subrack cannot be smoothly reconstructed into a master subrack.
For the OSN 9800 universal platform subracks:
1+1 redundancy is recommended for the system control boards in a master subrack.
When an OSN 9800 universal platform subrack is used as a slave subrack, no system control board needs to be configured.
An NE consisting of only one subrack cannot be smoothly reconstructed into an NE using master and slave subracks.
A slave subrack cannot be smoothly reconstructed into a master subrack.
OSN 9800 universal platform subracks can work with OSN 9800 P18 subracks to form an NE in master-slave mode.

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