Cooling Subsystem - Intel SR870BN4 - Server Platform - 0 MB RAM Product Manual

Redundant AC Power Source Operation
Each power supply module requires one power cord to supply AC power to the system. When two
power supply modules and two power cords are installed, the system supports (1+1) power cord
redundancy at 220 VAC. This feature allows the system to be powered by two separate AC
sources. In this configuration, the system continues to operate without interruption if one of the AC
sources fails.
Plug-in DC-to-DC Converters
Two types of plug-in DC-to-DC converters are used in the system:
5 V output
Voltage ID (VID) (2.5 or 3.3 V output)
A control bit set by the board determines output voltage on the VID DC-to-DC converters. The
T-DC-to-DC converters contain an LED for failure indication.
The processor board supports three VID T-DC-to-DC converters (one 3.3 V and two 2.5 V).
The I/O board supports two 5 V and two VID (3.3 V) T-DC-to-DC converters. Each T-DC-to-DC
converter powers a separate plane on the board; therefore all DC-to-DC converter slots must be
populated.
Processor Power Pods
Dedicated power pods supply power to each processor. The input connector of the power pod is
connected to the 48 V power on the processor board via a short cable. The output connector of the
power pod mates directly with the processor package.
The Power Distribution Board
The power distribution board supplies 48 V main and 12 V standby power to all server system
components.

Cooling Subsystem

CAUTION
The chassis top cover must be installed and closed for proper system cooling.
Additionally, cooling components must be hot-swapped within a limited time
period. This time period applies only to the time that the cooling component
is physically removed, not from the time of failure.
The cooling subsystem consists of a hot-swap, redundant (3+1) system fan array installed in the fan
bay, and the fans in the power supply modules. In the event of a cooling component failure, system
cooling is maintained and the system continues to operate while the component is being
hot-swapped. All system fans have tachometer output and internal speed control.
NOTE
The server supports only a fully populated system fan configuration. All
configurations are redundant except those with only one power supply
installed.
32 Intel® SR870BN4 Server System Product Guide