Juniper SRX5400 Manual page 46

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You must install at least one interface card in the services gateway. The interface card can be of any of
the available IOC, Flex IOC, or MPC types. You can add just one MIC; or you can add two MICs of the
same or different types.
You can install MPCs in any of the slots that are not reserved for Switch Control Boards (SCBs).
If a slot in the SRX5400, SRX5600, or SRX5800 Services Gateway card cage is not occupied by a card,
you must install a blank panel to shield the empty slot and to allow cooling air to circulate properly through
the services gateway. If a slot in an MPC is not occupied by a MIC, you must install a blank panel in the
empty MIC slot to shield it and to allow cooling air to circulate properly through the MPC.
Figure 19: SRX5K-MPC
MPC (empty)