Bothgrids in a power redundant system should havethe same number of power supplies. If your system is configured for grid redundancy,
slots 1 and 2 are assigned to grid 1 and slots 3 and 4 are assigned to grid 2. If only two power supplies (PS) are in a redundant- mode
chassis, they should be in slots 1 and 3. Slot and cord connection numbering is shown below.
Figure 12: Power Supply Bay and Connector Numbering
PS1 PS2 PS3 PS4
ServerSlot 1 ServerSlot 2
ServerSlot 3
ServerSlot 5
ServerSlot 7
ServerSlot 4
ServerSlot 6
ServerSlot 8
Front
Fan1 Fan2
I/OModule Slot 1
I/OModule Slot 2
Connector
PS4
Connector
PS3
Connector
PS2
Connector
PS1
Fan6
Fan5
Fan4
Fan3
Fan8
Fan7
Rear
279770
Note
Step 6 Connect the server chassis to the fabric interconnect as described in Proper FEX and Fabric Interconnect Port
Connectivity, on page 20.
Connecting a DC Power Supply
This section describes how to connect power to the rear PDU terminals on the DC version chassis
(UCSB-5108-DC) corresponding to a UCS 5108 DC power supply (UCSB-PSU-2500DC48).

Required Tools

Youmust have the following tools to perform this procedure:
•A Phillips screwdriver
•A 10-mm wrench or socket
•Connectors and wire for the DC circuit or circuits

DC Power Installation Procedure

When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type
with upturned lugs. These terminationsshould be the appropriate size for the wires and should clamp both
the insulation and conductor. Statement 1002
Warning
Cisco UCS 5108 Server Chassis Installation Guide
16 OL-20035-05
Installation
Connecting a DC Power Supply