R2000GZ and R2000GL

Intel
®
Server System R2000GZ/GL Product Family TPS
3.9 Closed Loop System Throttling (CLST)
The server system has support for Closed Loop System Throttling (CLST). CLST 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 (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 24. 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, F a n Fail
AMBER
Power supply FW updating
2Hz Blink GREEN
30 Revision 2.2