Considerations for the WS-C3850-12X48U-L, WS-C3850-12X48U-S and WS-C3850-12X48U-E switch
models:
Note
•
The primary power supply for these switch models should be a minimum of 470 W.
•
350 W or 440 W can be used only as secondary power supplies. If the switch draws power from
these modules as the primary source, reboot the switch to restore these modules as secondary power
supplies.
The power supply modules have two status LEDs.
Table 16: Switch Power Supply Module LEDs
DescriptionPS OKDescriptionAC OK
DC OK
Output is disabled, or input is outside
operating range (AC LED is off).
Output is disabled, or input is outside
operating range (DC LED is off).
OffNo AC input power.
No DC input power.
Off
Power output to switch active.GreenAC input power present.
DC input power present.
Green
Output has failed.Red
For information about replacing a power supply module, wiring a DC power supply module, and module
specifications, see the "Power Supply Installation" and "Technical Specifications" chapters.
Fan Module
Depending on the switch model, three or five internal hot-swappable 12-V fan modules (FAN-T1=) are
available. The air circulation system consists of the fan modules and the power supply modules. The airflow
patterns vary depending on the power supply configuration.
When the fan modules are operating properly, a green LED is on at the top left corner of the fan assembly
(viewed from the rear). If the fan fails, the LED turns to amber. The switch can operate with two operational
fans, but the failed fan should be replaced as soon as possible to avoid a service interruption due to a second
fan fault.
The WS-C3850 switches require three fans for proper cooling. The WS-C3850-48XS switches require
five fans for proper cooling.
Note
Catalyst 3850 Switch Hardware Installation Guide
OL-26779-05 29
Product Overview
Fan Module
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