Fan Modules
Thechassis can accept up toeight fan modules(N20-FAN5). A chassis must have filler plates in place if no
fanwill be installed in a slot for an extended period.
LEDs
Thereis oneLED indicationof the fanmodule’s operational state. See InterpretingLEDs, on page 25 for
details.
Buttons and Connectors
Nobuttons orconnectors are ona fanmodule.
Power Supplies
Differentpower supplies are available to work withthe AC (N20-PAC5-2500W)or DC
(UCSB-PSU-2500DC48)versions of the chassis. To determine the number of power supplies needed for a
givenconfiguration, use the Cisco UCS PowerCalculator tool.
LEDs
TwoLEDs indicate power connection presence, power supply operation, and fault states. See Interpreting
LEDs, on page 25 for details.
Buttons
Thereare no buttons on a power supply.
Connectors
Thepower connections are at the rear of the chassis on the PDU, with different types for AC or DC input.
Foursingle-phase, hot-swappable power supplies are accessible from the front of the chassis. These power
suppliescan be configuredto support non-redundant,N+1 redundant, andgrid-redundant configurations.
Power Supply Redundancy
Powersupply redundancy functions identically for AC and DC configured systems. When considering power
supplyredundancy youneed to takeseveral things into consideration:
•Powersupplies are all single phase andhave a singleinput for connectivityto customer power source
(arack PDU such as the Cisco RP Series PDU or equivalent).
•Thenumber of power suppliesrequired to power a chassis varies depending on the following factors:
Cisco UCS 5108 Server Chassis Installation Guide
OL-20035-05 21
Overview
Fan Modules