Technical Product Specification

Intel® Server System R2000IP Product Family TPS Power Subsystem
Revision 1.1
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3.8.6 SMBALERT Output Signal
SMBALERT signal is open drain output signal to give an alert when any problem happens on
PMBUS*.
Table 29. SMBALERT Signal Characteristics
Signal Type
Open Drain Output Signal, Low active
MIN
MAX
Logic level low voltage
0V
0.4V
Logic level high voltage
3.46V
Sink current Vout_low = 0.4V
2mA
3.8.7 Power Supply Status LED
There will be a single bi-color LED to indicate power supply status. The LED operation is
defined below.
Table 30. LED Indicators
Power Supply Condition
LED state
No AC power to all power supplies
OFF
Power supply critical event causing a shutdown; failure, OCP, OVP, Fan Fail, AC
out of range, No AC power to this PSU only (for 1+1 configuration)
AMBER
Power supply warning events where the power supply continues to operate; high
temp, high power, high current, slow fan.
1Hz Blink AMBER
AC present/Only 5VSB on (PS off)
1Hz Blink GREEN
Output ON and OK
GREEN
The LEDs shall be visible on the power supply’s exterior face. The LEDs’ location shall meet
ESD requirements. LEDs shall be securely mounted in such a way that incidental pressure on
the LEDs shall not cause it to become displaced.
The LED shall be green or amber when lit. The LED shall be labeled with the two symbols
below.
Power Symbol Fail Symbol
3.8.8 12LS (Load Share) Signal
This input/output will allow two or more power supplies to share +12V output between them.
The voltage of this signal will be a linear slope from zero to full load. The requirements below
apply for both high line and low line condition. Whether operating on a high line or a low line,
zero to 100% load as specified in section 7.4 will result in 0V to 8V on the current share line.