Power Subsystem
Intel® Server System R2000LH2/T2 Product Family TPS
Revision 1.0
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3.8
Closed Loop System Throttling (CLST)
The server system supports Closed Loop System Throttling (CLST). CLST prevents the system
from crashing if a power supply module is overloaded. If the system power reaches a pre-
programmed power limit, CLST will throttle system memory and/or processors to reduce power.
System performance will be impacted if this occurs. For more information about CLST
implementation, refer to the
SmaRT & CLST Architecture on “Romley” Systems and Power
Supplies Specification
(IBL Reference # 461024).
3.9
Smart Ride Through (SmaRT)
The server system supports 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
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.
3.10
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 23. 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
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