Installation guide

Chapter 1 Product Overview
Rear Panel Description
1-28
Catalyst 3750 Switch Hardware Installation Guide
OL-6336-01
Power Connectors
The switch is powered through the internal power supply. You can also connect
the Cisco RPS 675 to provide backup power if the switch internal power supply
should fail.
Note The Catalyst 3750 switch and the Cisco RPS 675 should be connected to the same
AC power source.
Internal Power Supply Connector
The internal power supply is an autoranging unit that supports input voltages
between 100 and 240 VAC. Use the supplied AC power cord to connect the AC
power connector to an AC power outlet.
Cisco RPS Connector
The Cisco RPS 675 (model PWR675-AC-RPS-N1=) supports the Catalyst 3750
family of switches.
Cisco RPS 675
The Cisco RPS 675 has two output levels: –48 V and 12 V with a total maximum
output power of 675 W. Use the supplied RPS connector cable to connect the RPS
to the switch.
Warning Attach only the Cisco RPS (model PWR675-AC-RPS-N1=) to the RPS receptacle.
The RPS is a redundant power system that can support six external network
devices and provides power to one failed device at a time. It automatically senses
when the internal power supply of a connected device fails and provides power to
the failed device, preventing loss of network traffic. For more information on the
Cisco RPS 675, see the Cisco RPS 675 Redundant Power System Hardware
Installation Guide.