Cisco Systems 4500 manual System Architecture, Power Flow

Chapter 1 Product Overview

System Architecture

System Architecture

This section describes the interaction between the various system components of Catalyst 4500 series switches. A Catalyst 4503 only is shown in the examples.

Power Flow

Figure 1-21shows power ingress and flow through the system.

Figure 1-21	Power Flow
Ingress to PS		Ingress to PS

PS1	PS2
Fan
tray
	Supervisor engine
	Switching module
	Switching module
Backplane	IP	120919
12 V
3.3 V
48 V

Power enters the switch through the power supplies. Several types of power supplies are available, depending on the power needs for your system and the power type available on your site. All power supplies provide a 3.3 V circuit (shown as a dash-dot line) to the components on the backplane and a 12 V circuit (shown as a solid line) that is carried over the backplane to the fans, supervisor engine, and switching modules. Power supplies that support PoE (1300 W AC,

Catalyst 4500 Series Switches Installation Guide

78-14409-08 1-43