Intel Server System R2000BB Family

Intel
®
Server System R2000BB Product Family TPS
Revision
2.0
23
The BMC shall schedule a rolling change for which PSU is the Active, Cold Stby1, Cold Stby 2, and Cold Stby
3 power supply. This allows for equal loading across power supply over their life.
Events that trigger a re-configuration of the power supplies using the Cold_Redundancy_Config command.
o AC power ON
o PSON power ON
o Power Supply Failure
o Power supply inserted into system
3.8.4 Power Supply Turn On Function
Powering on and off of the cold standby power supplies is only controlled by each PSU sensing the Vshare
bus. Once a power supply turns on after crossing the enable threshold; it lowers its threshold to the disable
threshold. The system defines the ‘position’ of each power supply in the Cold Redundant operation. It will do
this each time the system is powered on, a power supply fails, or a power supply is added to the system.
The system is relied upon to tell each power supply where it resides in the Cold Redundancy scheme.
3.9 Closed Loop System Throttling (CLST)
The server system has support for Closed Loop System Throttling (CLST). This feature prevents the system
from crashing if a power supply module is overloaded. Should system power reach a pre-programmed power
limit, CLST will throttle system memory and/or processors to reduce power. System performance will be
impacted should this occur. For more in depth information about CLST implementation, please refer to the
SmaRT & CLST Architecture on “Romley” Systems and Power Supplies Specification (IBL Reference #
461024).
3.10 Smart Ride Through Throttling (SmaRT)
The server system has support for Smart Ride Through Throttling (SmaRT). This feature increases the
reliability for a system operating in a heavy power load condition, to remain operational during an AC line
dropout event. See section 3.5.4 AC Line Dropout / Holdup for power supply hold up time requirements for AC
Line dropout events.
When AC voltage is too low, a fast AC loss detection circuit inside each installed power supply asserts an
SMBALERT# signal to initiate a throttle condition in the system. System throttling reduces the bandwidth to
both system memory and CPUs, which in turn reduces the power load during the AC line drop out event.
3.11 Power Supply Status LED
There is a single bi-color LED to indicate power supply status. The LED operation is defined in the following
table.
Table 18. LED Indicators
Power Supply Condition
LED State
Output ON and OK
GREEN
No AC power to all power supplies
OFF
AC present / Only 12VSB on (PS off) or PS in Cold redundant
state
1Hz Blink GREEN
AC cord unplugged or AC power lost; with a second power supply
in parallel still with AC input power.
AMBER
Power supply warning events where the power supply continues
to operate; high temp, high power, high current, slow fan.
1Hz Blink Amber
Power supply critical event causing a shutdown; failure, OCP,
OVP, Fan Fail
AMBER
Power supply FW updating
2Hz Blink GREEN