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Environment/Versions NG-100G-F2 and CPU5004A Number of other modules. Number of power supplies. Answer In Spirent TestCenter, How many power supply needed when use NG-100G-F2 and CPU5004A in 9U chassis? From Hardware Reference manual, we can only find reference as below item:     By indirect reference, we can assume that 2 power supplies are required for all other configurations.  There is also the point that by default the SPT-9000A chassis is always sold with 2 power supplies. You cannot buy a SPT-9000A with only 1 power supply.  From SPT-9000A Chassis Power Supply Installation Instructions document, we can see SPT-9000A chassis includes two power supplies (ACC-9001A) at original, and an optional redundant power supply is third.  So as a conclusion, 9U chassis need two standard power supplies for normally running well by default.