Juniper SRX5800 Hardware Manual page 190

Sample configuration for SRX5800 Services Gateway chassis with SRX5K-SCB3 (SCB3) and
SRX5K-RE-1800X4 (RE2):
Four high-capacity AC power supplies (using two feeds for each power supply); two supplies are active,
two are redundant.
Two Switch Control Boards (SCBs) with one Routing Engine installed in SCB 0
IOC3 (SRX5K-MPC3-40G10G or SRX5K-MPC3-100G10G) Modular Port Concentrator
SPC2 Services Processing Card
NOTE: You must have high-capacity power supplies (either AC or DC) and high-capacity
fan trays installed in the services gateway in order to install and use SPC2. If you do not
have high-capacity power supplies and fan trays installed, the services gateway will log an
alarm condition when it recognizes the SPC.
High-capacity cooling system (upper and lower fan trays)
NOTE: The high-capacity cooling system satisfies cooling requirements of SPC2 and must
be used for proper cooling.
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