Chapter 4 Motherboard Connections; Power Connections - Supermicro SuperServer SYS-221GE-NR User Manual

Motherboard Connections
This section describes the connections on the motherboard and provides pinout definitions.
Note that depending on how the system is configured, not all connections are required. The
LEDs on the motherboard are also described here. A motherboard layout indicating component
locations may be found in
Please review the Safety Precautions in

4.1 Power Connections

Power Supply Connectors
Two power supply connectors, PSU1 and PSU2, provide the main power to your system.
Connect the Power Sideband Distributor Power Board (PDB) connector (JPDB1), which is on
the rear side of the chassis, to the CST pin: +12V (Main Power In) and the CST pin: GND
(Ground: Main Power Out) to provide to system components/devices.
An 8-pin Standard Power connector (JPWR1) also provides power to onboard devices. In
addition, two 2-pin +12V power connectors (JPWR2/JPWR3) are used for peripheral devices.
(JPWR2 is used as an Auxiliary power connector, while JPWR3 is used as a +12V Standby
power connector.) All these power connectors meet the ATX SSI EPS 12V specification.
Important: To provide adequate power to your system, be sure to connect power supply Unit1/
Unit2, Power Sideband Distributor board to the +12V CST pin and the GND (Ground) CST
pin for main system power supply. Also connect the standard 8-pin power connector (JPWR1)
and the 2-pin Auxiliary Power connectors (JPWR2/JPWR3) to appropriate power supplies to
provide adequate power to your system. Failure to do so may void the manufacturer warranty
on your power supply and your motherboard.
8-pin Standard Power
Pin Definitions (JPWR1)
Pin# Definition
1 - 4 Ground
5 - 8 +12V
Required Connection
Chapter 4
Chapter 1. More detail can be found in the
Appendix A
2-pin Auxiliary Power
Pin Definitions (JPWR2)
Pin# Definition
1 Ground
2 P12V_AUX
Required Connection
40
Chapter 4: Motherboard Connections
Motherboard Manual
before installing or removing components.
2-pin Standby Power
Pin Definitions (JPWR3)
Pin# Definition
1 Ground
2 P12V_STBY
Required Connection