Is there any limitation on the slots of the main control boards and LPUs

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A main control board can be installed in either of the two slots reserved for the main control board. An LPU can be installed in any slot reserved for LPUs. However, the main control board cannot be installed in the slot reserved for LPU, and the LPU cannot be installed in the slot reserved for the main control board.
For details about slot distribution of LPUs and MPUs, see How Are Slots of an S7703 Chassis Distributed?, How Are Slots of an S7706 Chassis Distributed?, How Are Slots of an S7712 Chassis Distributed?, How Are Slots of an S9703 Chassis Distributed?, How Are Slots of an S9706 Chassis Distributed?, and How Are Slots of an S9712 Chassis Distributed?.

Other related questions:
Are the main control boards and LPUs hot swappable
All the main control boards and LPUs of the S7700&S9700 are hot swappable. In addition, the fans and power supplies are hot swappable. The ES0D00FSUA00, ES02VSTSA, and EH1D2VS08000 are not hot swappable. NOTE: Before removing the master main control board, perform an active/standby switchover. For details, see the description of main control board replacement in Hardware Installation and Maintenance Guide.

Slot problem of LPUs on S series switches
LPUs of S series switches can be installed in any LPU slots. You can use Hardware Query Tool to query specified slots of modular switches.

Can the main control board be installed in other slots on the U1900 series unified gateway
The SCU board on the U1900 must be installed in a fixed slot.

What are the models of the MCU main control board?
The MCU main control board has the following models: ViewPoint 8650C: GCCC ViewPoint 8650: GCCA ViewPoint 8660: GCCB VP9630: ECCC VP9650: ECCA VP9660: ECCB

What are the types of the main control boards of the S12700
The main control boards of the S12704, S12708 and S12712 are ET1D2MPUA000.

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