Cause why no jumper or DIP switch can be found on the AUX board of the OSN 8800

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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.

Other related questions:
DIP switches and fiber jumpers on the AUX board
For details on the DIP switches and fiber jumpers, see descriptions of AUX DIP switches and fiber jumpers in product manuals.

Functions of the jumpers and DIP switches on an AUX board
They are used to set subrack IDs.

Default settings of the fiber jumpers on the AUX board
The default fiber jumper setting of the AUX board is the setting before board delivery. That is, each fiber jumper of the AUX board is capped. You need to set the fiber jumpers based on the actual situations. For details, see descriptions of AUX fiber jumpers in product manuals.

Cause why the STG board is mandatory for the OSN 8800 but optional for the OSN 6800
The OSN 8800 of version V100R002 or later is a synchronous system, requiring that all service boards and cross-connect boards are synchronized (with the same frequencies and aligned frame headers). Therefore, a unique reference clock signal and a unique frame header are required. To meet this requirement, each service board outputs services according to the clock signal and frame header of a clock board. Therefore, the STG board is mandatory for the OSN 8800 of version V100R002 or later. If no STG board is configured, centralized service scheduling cannot be achieved. The OSN 6800 is an asynchronous system and does not require a unique reference clock or unique frame header. Therefore, no STG board needs to be configured for the OSN 6800.

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.

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