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Chapter 4: Motherboard Connections
4.2 Headers and Connectors
Fan Headers
There are eight fan headers on the motherboard, (FAN1-8). These are 4-pin fan headers,
although pins 1-3 are backward compatible with traditional 3-pin fans. Four-pin fans allow
fan speeds to be controlled by Thermal Management in the BMC. When using the Thermal
Management setting, use all 3-pin fans or all 4-pin fans.
Fan Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
SGPIO Header
A Serial General Purpose Input/Output header (T-SGPIO3) is used to communicate with the
enclosure management chip on the backplane.
SGPIO Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
NC
2
NC
3
Ground
4
DATA Out
5
Load
6
Ground
7
Clock
8
NC
NC = No Connection
Disk-On-Module Power Connector
Two power connectors for SATA DOM (Disk-On-Module) devices are located at JSD1 and
JSD2. Connect appropriate cables here to provide power support for your Serial Link DOM
devices.
DOM Power
Pin Definitions
Pin#
Definition
1
5V
2
Ground
3
Ground