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S
UPER
S
ERVER 1027GR-TRF/1027GR-TRFT User's Manual
Unit Identifi er Switch
A Unit Identi
fi
er (UID) switch and two LED
indicators are provided on the serverboard.
The rear UID LED (LE4) is located next
to the rear UID switch. The front panel
UID LED is on pins 7/8 of JF1. Connect
a cable to pins 7/8 on JF1 for front panel
UID indication. Pressing the UID switch will
turn on both the rear and front UID LEDs.
Pressing the UID switch again will turn
off both LEDs. These UIDs provide easy
identi
fi
cation of a system unit that may be
in need of service.
Note:
the
UID can also be triggered via
IPMI. Please refer to the IPMI User's Guide
posted on our Website.
UID Switch
Pin# De
fi
nition
1
Button In
2
Ground
3
Ground
4
Ground
UID LED (LE4)
Status
Color/State OS Status
Blue:
On
Windows OS
Unit Identi
fi
ed
Blue:
Blinking
Linux OS
Unit Identi
fi
ed
Overheat LED/Fan Fail
The JOH1 header is used to connect an
LED indicator to provide warnings of chas-
sis overheating and fan failure. This LED
will blink when a fan failure occurs. Refer
to the tables on right for pin de
fi
nitions.
Overheat LED
Pin Defi nitions
Pin# De
fi
nition
1
5vDC
2
OH Active
OH/Fan Fail LED
Status
State Message
Solid
Overheat
Blinking
Fan Fail
Power SMB (I
2
C) Connectors
Power System Management Bus (I
2
C)
Connectors (JI
2
C1/JI
2
C2) monitor power
supply, fan and system temperatures. See
the table on the right for pin de
fi
nitions.
PWR SMB
Pin Defi nitions
Pin# De
fi
nition
1
Clock
2
Data
3
PWR Fail
4
Ground
5
+3.3V
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