GBU666**S (GBU666--S) Base Rack for S2E, 5 I/O Slots/ Expansion Rack for S2T/S2, 6 I/O Slots.
This V2000 system rack is equivalent to the T2 system's TBU268--S (The T2 system is obsolete)
The first slot is only for an interface module that is used when the rack is expanded
The second slot is always for the power supply - a power supply is required for all racks
The third slot is for the CPU and only used on the base rack.
The rest of the slots are for I/O cards.
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