Supermicro H12SSL Series User Manual page 41

Onboard Battery (BT1)
The onboard back up battery is located at BT1. The onboard battery provides backup power
to the on chip CMOS, which stores the BIOS' setup information. It also provides power to
the Real Time Clock (RTC) to keep it running.
NCSI Header (JNCSI1)
The NCSI (Network Controller Sideband Interface) header is located at JNCSI1. This header
is an interface used to connect the BMC (Baseboard Management Controller) to a set of
Network Interface Controllers to enable out-of-band remote manageability.
Chassis Intrusion (JL1)
A Chassis Intrusion header is located at JL1 on the motherboard. Attach the appropriate cable
from the chassis to the header to inform you when the chassis is opened.
Overheat LED/Fan Fail (JOH1)
The JOH1 header is used to connect an LED indicator to provide warnings of chassis
overheating or fan failure. This LED will blink when a fan failure occurs. Refer to the table
on right for pin definitions.
Overheat / Fan Fail
Pin Definitions
Pins Definition
1 5vDC
2 OH Active
Chassis Intrusion
Pin Definitions
Pins Definition
1 Ground
2 Intrusion Input
Overheat / Fan Fail
Status
Off
On, Solid
On, Blinking
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Chapter 2: Installation
LED Status
Definition
Normal
Overheat
Fan Failure