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Catalyst 3750 Switch Hardware Installation Guide
OL-6336-07
Chapter 1 Product Overview
Rear Panel Description
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.
DC Power Connector
The Catalyst 3750G-12S-SD has an internal DC-power converter. It has dual feeds (A and B) that are
diode-OR-ed into a single power block. For installation instructions, see Appendix C, “Connecting to
DC Power.”
Caution You must connect the Catalyst 3750G-12S-SD switch only to a DC-input power source that has an input
supply voltage from –36 to –72 VDC. If the supply voltage is not in this range, the switch might not
operate properly or might be damaged.
Cisco RPS Connector
The Cisco RPS 2300 (model PWR-RPS2300) and the Cisco RPS 675 (model PWR675-AC-RPS-N1=)
support the Catalyst 3750 family of switches, except the Catalyst 3750G-12S-SD switch.
Warning
Attach only the following Cisco RPS model to the RPS receptacle:
PWR-RPS2300, PWR675-AC-RPS-N1=.
Statement 370
Cisco RPS 2300
The Cisco RPS 2300 has two output levels: –52 V and 12 V with a total maximum output power of
2300 W.
The Cisco RPS 2300 is a redundant power system that provides seamless failover for up to six network
devices for internal power supply failures. It automatically senses if an internal power supply of a
connected device fails and immediately supplies power to the failed device. For more information on the
Cisco RPS 2300, see the Cisco RPS 2300 Redundant Power System Hardware Installation Guide.
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.
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.
