Cisco Catalyst 3550

Chapter 1 Product Overview
Rear-Panel Description
1-10
Catalyst 3550 Multilayer Switch Hardware Installation Guide
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Power Connectors
The switch is powered through the internal power supply. You can also connect
the Cisco RPS 300 Redundant Power System to provide backup power if the
switch internal power supply should fail.
Note The Catalyst 3550 switch and the Cisco RPS 300 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 300 (model PWR300-AC-RPS) supports the Catalyst 3550
switch. The Cisco RPS 300 has two output levels: –48V and 12V with a total
maximum output power of 300W. Use the supplied RPS connector cable to
connect the RPS to the switch.
Warning Attach only the Cisco RPS 300 (model PWR300-AC-RPS) 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 300, refer to the Cisco RPS 300 Redundant Power System Hardware
Installation Guide.