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Catalyst 3750-X and 3560-X Switch Hardware Installation Guide
OL-19593-01
Chapter 1 Product Overview
Rear Panel Description
For information about replacing a power supply module, wiring a DC power supply module, and module
specifications, see
Chapter 3, “Power Supply and Fan Module Installation,” and Appendix A, “Technical
Specifications.”
Fan Modules
The switch has two internal hot-swappable 12-V fan modules, each with two fans. The air circulation
system consists of the fan modules and the power supply modules. The airflow patterns vary depending
on the power supply configuration.
Figure 1-8 shows the airflow patterns for the 24- and 48-port switches. The blue arrow shows cool air
flow, and the red arrow shows warm air flow. 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.
Figure 1-8 24- and 48-Port Switch Airflow Patterns
For information about installing a fan module and the module specifications, see Chapter 3, “Power
Supply and Fan Module Installation,” and Appendix A, “Technical Specifications.”
XPS Connector
Warning
Attach only the following Cisco external power system to the switch: XPS 2200.
Statement 387
The Cisco XPS-2200 is a expandable power system that can support nine network switches and provides
power to one or two failed switches at a time. It senses when the power supply of a connected switch
fails and provides power to the failed switch.
Use the XPS-2200 only with approved Cisco XPS cables. You can order these XPS cables for connecting
your switch to the XPS-2200 from your Cisco sales representative:
• CAB-XPS-58CM (0.58-meter cable)
• CAB-XPS-150CM (1.5-meter cable)
The Cisco XPS-2200 has a nominal output level of –56 V. The total maximum output power depends on
the installed power supply modules.
Catalyst 3750-X PoE+48
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