Dell PowerEdge R900 - Manual (Page 160)

160 Jumpers and Connectors
Figure 6-5. SAS Backplane Connectors: 3.5-inch x5 Option (Back)
Power Interposer Connectors
Figure 6-6 and Figure 6-7 show the locations for the Power Interposer
connections on 2.5-inch systems.
1 SATA_A 2 Control Panel
3 Backplane B 4 GND/+12V
5 Backplane A
1
4 3 2 5