Themis CoolShell 3U, Руководство по установке

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2-7
Themis Computer
2—Installation and Operation
2.2 Operation
2.2.1 Power
The CoolShell 3U powers on automatically when AC power is supplied to any of the
two system power supplies. Once the system backplane and all other components
have received power, the motherboard will begin boot process and load the OS.
2.2.1.1 Power Sequence
The CoolShell 3U has a specific power up sequence when AC power is provided to
the system. This sequence is as follows:
1. Shortly after AC is on, the +12V backplane will be present
2. This is immediately followed by the +12VSTBY and +5VSTBY rails. The
+5VSTBY power, the standby section in the PCH, as well as the BMC on the
motherboard in the CPU blade
3. After a 4s delay following the presence of +5VSTBY, a pulse is sent (PwrOn
signal) to the motherboard
4. This pulse is forwarded to the CPU carrier through the PCH and through the
ATX PSon assertion. This turns on the primary hotswap and powers on all
downstream DC converters (+12V, +5V, +3.3V, -12V)
5. If all power rails are within their nominal range, the ATX PwrOK signal is as-
serted and sent to the motherboard
6. With all power rails up and operating within their nominal range, the power
LED (green) will be lit on each component of the CoolShell 3U.
Note: If desired, the CoolShell 3U can be configured so the system will not pow-
er on automatically (full OS boot) when AC power is provided to any of the two
power supplies in the system. This configuration is done at the factory and should
be requested at the time of order.