Relationship between the AUX board and the EFI1 and EFI2 boards on the OSN 8800

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The AUX board is connected to the EFI1 and EFI2 boards through the backplane.

Other related questions:
Relationship between SXM and XCT boards in an OSN 8800 T64 subrack
When the SXM and XCT boards work together in an OSN 8800 T64 subrack, ODUk cross-connections can be scheduled. The two boards do not form active/standby protection. To configure 1 + 1 backup for SXM boards, you need to insert two SXM boards of the same version into IU10 and IU44 slots or IU9 and IU43 slots. When an OSN 8800 T64 subrack contains only SXH or SXM cross-connect boards and XCT boards need to be added to support ODUk services, you must insert the physical boards before adding logical boards; otherwise, existing SDH services will be interrupted.

Impact of the fault of the only AUX board in an OSN 8800 subrack
The AUX board implements inter-board and inter-subrack communication, and intra-subrack management. If the board is not equipped with 1+1 protection and becomes faulty, the communication between its resident NE (or subrack) and the U2000 server will be interrupted.

Relationships between the DIP switches on the AUX board and subrack IDs
The jumpers and DIP switches on an AUX board are used to configure subrack IDs. The subrack ID configuration rules vary depending on the AUX boards of different versions.

Active/standby relationship between the four PIU boards in an OSN 8800 T32 subrack
In an OSN 8800 T32 subrack, the active/standby relationship between the four PIU boards is as follows: The PIU boards in slots 39 and 40 are in a pair and function as the active power boards, and the PIU boards in slots 45 and 46 are in a pair and function as the standby power boards.

Cause why no jumper or DIP switch can be found on the AUX board of the OSN 8800
No jumper or DIP switch is available on the TN51AUX board on the OSN 8800. If master and slave subracks need to be configured, you can configure subrack IDs using EFI1 boards.

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