3Com® Switch 4500 Family
Getting Started Guide
Switch 4500 26-Port
Switch 4500 50-Port
Switch 4500 PWR 26-Port
Switch 4500 PWR 50-Port
www.3Com.com
Part No. 10012034, Rev. AB
Published: April, 2007
3Com Corporation
350 Campus Drive
Marlborough, MA
USA 01752-3064
Copyright © 2006-2007, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.
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ABOUT THIS GUIDE
Before You Start 7
Conventions 8
Related Documentation 8
Documentation Comments 8
1INTRODUCING THE SWITCH 4500 FAMILY
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About the Switch 4500 12 |
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Summary of Hardware Features |
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Switch 4500 — Front View Detail |
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10BASE-T/ 100BASE-TX Ports |
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Gigabit Ports |
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Console Port |
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Unit LED 17 |
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LEDs 17 |
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Switch 4500 — Rear View Detail |
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Power Socket |
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Open Book Warning Labels 19 |
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Redundant Power System Socket 20 |
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Default Settings |
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2 INSTALLING THE SWITCH |
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Package Contents |
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Important Steps Before Proceeding |
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Connecting a Redundant Power Supply to your Switch 4500 PWR 24 Specifying the Redundant Power System 27
Connecting the Switch to the Redundant Power System 28 Connecting the Earthing Cable 30
RPS LED 30
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Using Power over Ethernet |
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The Power-up Sequence |
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Powering-up the Switch 4500 |
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Checking for Correct Operation of LEDs |
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Choosing the Correct Cables for the 1000BASE-X SFP Ports |
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SFP Operation 34 |
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Approved SFP Transceivers |
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Inserting an SFP Transceiver |
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Removing an SFP Transceiver |
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Packing and Shipping the Switch 4500 |
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3 SETTING UP FOR MANAGEMENT |
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Methods of Managing a Switch |
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Command Line Interface Management |
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Command Line Interface Management using SSH 39 |
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Web Interface Management |
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SNMP Management |
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Setting Up Overview 40 |
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IP Configuration |
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Preparing for Management |
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Manually Configuring IP Information |
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Connecting to the Console Port |
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Connecting to a Front Panel Port |
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Viewing Automatically Configured IP Information |
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Using 3Com Network Director |
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Connecting to the Console Port |
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Setting Up Command Line Interface Management |
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User Interface Overview |
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CLI Management via the Console Port |
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CLI Management over the Network |
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Setting Up Command Line Interface Management using SSH |
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Setting Up Web Interface Management |
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Pre-requisites |
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Web Management Over the Network |
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Setting Up SNMP Management V1 or V2 |
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Pre-requisites |
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Default Users and Passwords |
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4 |
CREATING A STACK |
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How To Interconnect Units |
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Guidelines For Interconnecting Units 60 |
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Unit Numbering within the Stack |
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PROBLEM SOLVING |
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Solving Problems Indicated by LEDs |
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Solving Hardware Problems |
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Solving Communication Problems |
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Solving Stack Formation Problems |
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UPGRADING SOFTWARE |
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The Contents of the Executable File |
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Upgrading from the Command Line Interface 72 |
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Introduction 72 |
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Backup |
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TFTP |
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FTP |
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(via a network port) 76 |
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XModem (via the console cable) |
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Upgrading from the Bootrom Interface 78
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Introduction |
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TFTP |
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FTP |
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XModem |
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Bootrom Upgrade |
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Bootrom Upgrade |
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via TFTP |
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Bootrom Upgrade |
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via FTP 83 |
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Bootrom Upgrade |
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via XModem |
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A PIN-OUTS |
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Null Modem Cable |
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PC-AT Serial Cable |
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Modem Cable |
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Ethernet Port RJ-45 Pin Assignments 88
B TECHNICAL SPECIFICATIONS
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Switch 4500 (26 Port) |
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Switch 4500 |
(50 Port) |
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Switch 4500 |
PWR (26 Port) |
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Switch 4500 |
PWR (50 Port) |
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RPS 95 |
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Earthing Lead 95 |
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C OBTAINING SUPPORT FOR YOUR PRODUCT |
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Register Your Product |
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Purchase Value-Added Services 97 |
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Troubleshoot Online |
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Access Software Downloads |
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Telephone Technical Support and Repair 98
Contact Us 99
INDEX
This guide provides all the information you need to install and use the following switches in their default state:
■Switch 4500 26-Port (3CR17561-91)
■Switch 4500 50-Port (3CR17562-91)
■Switch 4500 PWR 26-Port (3CR17571-91)
■Switch 4500 PWR 50-Port (3CR17572-91)
All procedures described in this guide apply to all models except where stated.
The guide is intended for use by network administrators who are responsible for installing and setting up network equipment; consequently, it assumes a basic working knowledge of LANs (Local Area Networks).
If the information in the Release Notes differ from the information in this guide, follow the instructions in the Release Notes.
The latest versions of user guides and release notes are available in Adobe
Acrobat Reader Portable Document Format (PDF) on the 3Com
World Wide Web site:
http://www.3com.com/
8 ABOUT THIS GUIDE
Conventions |
Table 1 lists conventions that are used throughout this guide. |
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Table 1 |
Notice Icons |
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Icon |
Notice Type |
Description |
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Information note |
Information that describes important features or |
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instructions |
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Caution |
Information that alerts you to potential loss of data or |
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potential damage to an application, system, or device |
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Warning |
Information that alerts you to potential personal injury |
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Related |
In addition to this guide, each Switch documentation set includes the |
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Documentation |
following: |
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■ Switch 4500 Configuration Guide |
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This guide contains information on the features supported by your |
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Switch and how they can be used to optimize your network. |
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■ Switch 4500 Quick Reference Guide |
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This guide contains: |
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■ a list of the features supported by the Switch. |
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■ a summary of the command line interface commands for the |
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Switch. This guide is also available under the Help button on the |
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web interface. |
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■ Switch 4500 Command Reference Guide |
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This guide provides detailed information about the web interface and |
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command line interface that enable you to manage the Switch |
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■ Release Notes |
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These notes provide information about the current software release, |
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including new features, modifications, and known problems. The |
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Release Notes are supplied in hard copy with your Switch. |
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Documentation |
Your suggestions are very important to us. They will help make our |
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Comments |
documentation more useful to you. E-mail comments about this |
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document to 3Com at: |
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pddtechpubs_comments@3com.com
Documentation Comments |
9 |
Please include the following information when commenting:
■Document title
■Document part number (on the title page)
■Page number (if appropriate)
Example:
Part Number 10015034 Rev. AB
Switch 4500 Family Getting Started Guide
Page 21
We can only respond to comments and questions about 3Com product documentation at this e-mail address. Please direct all questions related to technical support or sales in the first instance to your network supplier.
10 ABOUT THIS GUIDE
1 |
INTRODUCING THE |
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SWITCH 4500 FAMILY |
This chapter contains introductory information about the Switch 4500 and how it can be used in your network. It covers summaries of hardware and software features and also the following topics:
■About the Switch 4500
■Switch 4500 — Front View Detail
■Switch 4500 — Rear View Detail
■Default Settings
12 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
About the Switch |
The Switch 4500 Family are mixed media devices. Table 2 summarizes |
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4500 |
what each Switch consists of: |
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Table 2 Switch 4500 Family Hardware |
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Switch 4500 Family |
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10BASE-T\100BASE-TX Ports |
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10BASE-T\100BASE-TX PoE Ports |
10BASE-T\1000BASE-TX\1000BASE-T Ports |
1000BASE-X SFP Ports |
1000BASE-T SFP Transceiver |
RJ-45 Console Port |
-48V DC RPS Input |
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Switch 4500 26 Port |
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2* |
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Switch 4500 50 Port |
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2* |
2* |
2† |
1 |
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Switch 4500 PWR 26 Port |
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2* |
2* |
2† |
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Switch 4500 PWR 50 Port |
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48 |
2* |
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2† |
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* Combo SFP and 10/100/1000 Ports
† 1000BASE-T SFP transceiver installed in last two 1000BASE-X SFP ports
The Switch 4500 Family provides workgroup connectivity at 10and 100-Mbps, and high-speed Gigabit ports for stacking, uplinks to a backbone, or for server connections. With stacking, you can add additional Switch 4500s as your network grows while preserving ease of management.
For information about using the software features of the Switch, refer to the “Command Reference Guide” on located on 3Com’s Web site at www.3com.com.
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Switch 4500 — Front View Detail 13 |
Summary of Table 3 summarizes the hardware features that are supported by the |
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Hardware Features Switch 4500. |
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Table 3 Hardware Features |
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Feature |
Switch 4500 |
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Addresses |
Up to 8,000 supported |
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Auto-negotiation |
Supported on all non-SFP ports |
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Forwarding Modes |
Store and Forward |
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Duplex Modes |
Half and full duplex on all ports |
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Auto MDI/MDIX |
Supported on all ports. If fiber SFP transceivers are |
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used, Auto MDIX is not supported. |
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Flow Control |
In full duplex operation all ports are supported |
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Traffic Prioritization |
Supported (using the IEEE Std 802.ID, 1998 Edition): |
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Eight traffic queues per port |
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Power over Ethernet |
Supported on 10/100 ports (3CR17571-91 and |
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3CR17572-91 only) |
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Ethernet and Fast Ethernet |
Auto-negotiating 10BASE-T/100BASE-TX ports |
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Ports |
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Gigbait Ethernet Ports |
Auto-neogotiating 10BASE-T/100BASE-TX/ |
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1000BASE-T ports (3CR17561-91) only |
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SFP Ethernet Ports |
Supports fiber Gigabit Ethernet short-wave (SX), |
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long-wave (LX), long-haul (LH70) and copper (T) |
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transceivers in any combination. |
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RPS Supplemental |
Connects to -48v DC supply (3CR17571-91 and |
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PoE Power |
3CR17572-91 only) |
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Mounting |
19-inch rack or stand-alone mounting |
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Switch 4500 —
Front View Detail
Figure 1 Switch 4500 26-Port — front view
Port Status LEDs |
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Console Port |
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Unit LED |
Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex |
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3CR17561-91 SuperStack 3 Switch 4500 26-Port |
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25 |
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27/25 |
28/26 |
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10/100BASE-TX |
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1000BASE-X |
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10/100/1000BASE-T |
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1000BASE-X
10/100BASE-TX Ports Combo Port Power LED Pair
10/100/1000BASE-T
Combo Port Pair
14 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
Figure 2 Switch 4500 50-Port — front view
Port Status LEDs |
Console Port Unit LED |
PWR LED |
Speed:Green = 100Mbps, Yellow = 10Mbps Duplex:Green = Full Duplex, Yellow = Half Duplex |
3CR17562-91 SuperStack 3 Switch 4500 50-Port |
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49 |
50 |
51/49 |
52/50 |
PWR
RPS
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RPS LED |
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1000BASE-X SFP Ports |
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10/100BASE-TX Ports |
(Two pairs of Combo Ports |
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fitted with two1000BASE-T SFP |
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transceivers in last two ports) |
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Figure 3 Switch 4500 26-Port PWR - front view |
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Port Status LEDs |
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Console Port |
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RPS LED |
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Unit LED |
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Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps |
Duplex: Green = Full Duplex, Yellow = Half Duplex |
Power: Green = Delivering Power, Yellow = Fault, Flashing Green = Over Budget |
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3CR17571-91 SuperStack 3 Switch 4500 PWR 26-Port |
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25 |
26 |
27/25 |
28/26 |
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Mode |
RPS |
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Green=Speed |
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Yellow=Duplex |
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Flashing=PoE |
PWR |
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10/100BASE-TX |
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1000Base-X SFP Ports |
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10/100BASE-TX Ports |
(Two pairs of Combo Ports |
Mode LED |
Power LED |
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fitted with two 1000BASE-T |
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SFP transceivers in last two ports) |
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Figure 4 Switch 4500 50-Port PWR - front view |
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Port Status LEDs |
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Console Port |
Unit LED |
PWR LED |
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Mode LED |
Speed:Green = 100Mbps, Yellow = 10Mbps Duplex:Green = Full Duplex, Yellow = Half Duplex Power:Green = Deliverng Power. Yellow=Fault, Flashing Green=Over Budget |
3CR17572-91 SuperStack 3 Switch 4500 PWR 50-Port |
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Mode |
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Green=Speed |
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Yellow=Duplex |
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Flashing=PoE |
49 |
50 |
51/49 |
52/50 |
PWR
RPS
1000BASE-X SFP PortsRPS LED
10/100BASE-TX Ports |
(Two pairs of Combo Ports |
fitted with two 1000BASE-T |
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SFP transceivers in last two ports) |
WARNING: RJ-45 Ports. These are shielded RJ-45 data sockets. They cannot be used as standard traditional telephone sockets, or to connect the unit to a traditional PBX or public telephone network. Only connect RJ-45 data connectors, network telephony systems, or network telephones to these sockets.
Either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets.
Switch 4500 — Front View Detail 15
10BASE-T/ The Switch 4500 has 24 or 48 auto-negotiating 10BASE-T/100BASE-TX 100BASE-TX Ports ports configured as Auto MDIX (cross-over). These ports automatically
provide the appropriate connection. Alternatively, you can manually set these ports to 10BASE-T half-duplex, 10BASE-T full0-duplex, 100BASE-TX half-duplex or 100BASE-TX full-duplex. The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable.
The paired ports for the Switch 4500 26 Port and PWR 26 Port are:
■25 and 27
■26 and 28
The paired ports for the Switch 4500 50 Port and PWR 50 Port are:
■49 and 51
■50 and 52
By default, the ports are enabled as follows for the 26-Port switches:
■Port 25 = active; Port 27 = inactive
■Port 26 = active; Port 28 = inactive
By default, the ports are enabled as follows for the 50-Port switches:
■Port 49 = active; Port 51 = inactive
■Port 50 = active; Port 52 = inactive
To change which port is active, issue the undo shutdown command on the inactive port. This will enable the previously inactive port and disable its pair. Issuing this command will cause the switch to reboot.
A Gigabit connection can be either copper-based 1000Base-T or SFP-based fiberoptic connection. On the Switch 4500 10/100 26 Port unit, there are two SFP slots and two 1000Base-T ports. On the Switch 4500 PWR 26 Port, 50 Port, and PWR 50 Port models all the physical Gigabit ports are SFP slots.
16 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
Two 1000Base-T SFP transceivers are included with these units. These SFP transceivers can be inserted in any of the four SFP slots to provide copper Gigabit connectivity. If you install these in the inactive ports, then you will need to issue the undo shutdown command on those ports to make them active.
SFP (Small Form Factor Pluggable, or mini-GBIC) ports support fiber Gigabit Ethernet short-wave (SX), long-wave (LX), long-haul (LH70) and copper (T) SFP Transceivers in any combination. This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups.
The default state for these ports is auto-negotiation enabled, where the speed, duplex and flow control modes are negotiated. As the speed and duplex modes are fixed by the media type, only the flow control is negotiated with the link partner. Alternatively, auto-negotiation can be disabled (except 1000BASE-T which auto-negotiation is mandatory) and the flow control setting can be manually configured.
Switch 4500 — Front View Detail 17
Unit LED The Unit LED is a seven segment display visible on the front of the Switch. The Unit LED can be used to indicate the unit number in a fabric, POST test ID and software upgrade information. In the unlikely event of a hardware fault occurring, the Unit LED may be used to help diagnose the problem. For information on using the Unit LED for problem solving, see “Solving Problems Indicated by LEDs” on page 64
Table 4 LED Behavior
LED Color |
Indicates |
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|
Unit LED |
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Green |
Power On Self Test (POST) is in progress. During POST a the |
|
test ID number appears in the Unit LED (seven segment |
|
display). |
|
or |
|
Software download is in progress. During software |
|
download, a clockwise cycling bar appears in the Unit LED. |
Green flashing |
The Switch has failed POST. The Unit LED flashes the |
|
number of the test that has failed. |
Green flashing ‘f’ There has been a fan failure.
Green flashing ‘t’ The Switch is over temperature and unit temperature is critical.
PWR LED |
|
Green |
The Switch is powered-up and operating normally. |
Green flashing |
Self Test (POST) or Software Download is in progress. |
Yellow flashing |
One or more ports have failed POST. |
Red |
The Switch has failed its Power On Self Test. |
Off |
The Switch is not receiving power or there is a fault with the |
|
Power Supply Unit. |
Mode LED (3CR17571-91 and 3CR17572-91 only)
Speed |
Green |
10/100 Port Speed and Activity, 1000 SFP Status and |
|
|
Activity, or Stack Status and Activity. |
Duplex Yellow |
10/100 Duplex and Activity, 1000 SFP Duplex and Activity, |
|
|
|
or Stack Activity |
PoE |
Red |
10/100 Port showing PoE Information |
18 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
LED |
Color |
Indicates |
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||
RPS LED (3CR17571-91 and 3CR17572-91 only) |
||
|
Green |
AC and RPS supply connected. |
|
Yellow |
AC failed or not connected. RPS supply is OK. |
|
Off |
There is no RPS supply connected. |
10BASE-T/100-TX Port LEDs |
||
Speed |
Green |
A high speed (100 Mbps) link is present, blinking off for |
|
|
every packet received or transmitted. |
|
Yellow |
A low speed (10 Mbps) link is present, blinking off for every |
|
|
packet received or transmitted. |
|
Yellow Flashing |
The port has failed POST. |
|
Off |
No link is present. |
Duplex (3CR17571-91 and 3CR17572-91 only) |
||
|
Green |
Full duplex, blinking off for every packet received or |
|
|
transmitted. |
|
Yellow |
Half duplex, blinking off for every packet received or |
|
|
transmitted. |
|
Yellow flashing |
The port has failed POST. |
|
Off |
No link is present. |
PoE (3CR17571-91 and 3CR171572 only) |
||
|
Green |
Power is being delivered to the port. |
|
Green flashing |
Port power has exceeded limit or is unable to supply power |
|
|
due to unit being over budget. |
|
Yellow |
PoE error, no power supplied on port. |
|
Yellow flashing |
The port has failed post. |
|
Off |
No power is being delivered. |
1000BASE-X SFP Port LEDs |
||
Speed |
Green |
A high speed (1000 Mbps) link is present. |
|
Yellow Flashing |
Port failed POST. |
|
Off |
No link is present. |
Duplex (3CR17571-91 and 3CR17572-91 only) |
||
|
Green |
Full duplex packets are being transmitted/received on the |
|
|
port. |
|
Yellow |
Half duplex packets are being transmitted/received on the |
|
|
port. |
|
Yellow flashing |
Port failed POST. |
|
Off |
No link is present. |
|
|
|
Switch 4500 — Rear View Detail 19
Switch 4500 — Rear |
Figure 5 Switch 4500 — rear view |
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View Detail |
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Power Socket |
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Open Book Warning Labels |
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~100-240V; 50/60Hz; 1A
Earthing Screw
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Figure 6 Switch 4500 PWR - rear view |
Power Socket |
|
Open Book Warning Labels |
|
NULL |
|
~100-240V; 50/60Hz; 7.0A |
|
|
-53 |
-55V;19.5A |
|
Redundant Power System Socket |
Earthing Screw |
Power Socket The Switch automatically adjusts its power setting to any supply voltage in the range 100-240 VAC.
Open Book Warning Before installing or removing any components from the Switch 4500 or Labels carrying out any maintenance procedures, you must read the safety
information provided in Appendix A of this guide.
AVERTISSEMENT: Avant d'installer ou d'enlever tout composant des commutateurs de la gamme Switch 4500 ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans l'annexe A de ce guide.
VORSICHT:Bevor Sie Komponenten der Switch 4500-Baureihe installieren oder deinstallieren und bevor Sie Wartungsarbeiten ausführen, müssen Sie die in Anhang A dieses Handbuchs aufgeführten Sicherheitshinweise lesen.
ADVERTENCIA: Antes de instalar o extraer cualquier componente del Switch 4500 Family o de realizar tareas de mantenimiento, debe leer la información de seguridad facilitada en el Apéndice A de esta guía.
20 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
AVVERTENZA: Prima di installare o rimuovere qualsiasi componente dello Switch 4500 Family o di eseguire qualsiasi procedura di manutenzione, leggere le informazioni di sicurezza riportate nell'Appendice A di questa guida.
OSTRZEŻENIE: Przed instalacją lub usunięciem jakichkolwiek elementów z przełącznika z rodziny 4500 lub przeprowadzeniem prac konserwacyjnych należy zapoznać się z informacjami o bezpieczeństwie zawartymi w Załączniku A niniejszego podręcznika.
Redundant Power Provides supplemental power for PoE ports (up to 15.4w on all ports) and System Socket redundant power for powered devices and the Switch itself.
Table 5 Default Settings
Feature |
Switch 4500 |
|
|
Automatic IP Configuration |
Enabled |
Port Status |
Enabled |
Port Speed |
Auto-negotiated |
Duplex Mode |
Auto-negotiated |
Power over Ethernet |
Enabled (3CR17571-91 and 3CR17572-91 only) |
Flow Control |
Auto-negotiated |
Broadcast Storm Control |
Enabled |
Virtual LANs (VLANs) |
All ports belong to the untagged Default VLAN |
|
(VLAN 1) with IEEE Std 802.1Q-1998 learning |
|
operational |
Management VLAN |
Any VLAN for all units. |
Link Aggregation Control |
Disabled per port |
Protocol (LACP) |
|
IP Multicast Filtering |
Filtering enabled |
Rapid Spanning Tree Protocol |
Enabled |
Fast Start |
Enabled on front panel ports |
RMON Alarm |
Enabled |
|
Default Settings |
21 |
|
|
|
Feature |
Switch 4500 |
|
|
|
|
Traffic Prioritization |
All ports prioritize NBX VoIP traffic (LAN and IP). |
|
|
All ports set to “best effort” for all other traffic. |
|
Port Security |
Disabled per port |
|
Configuration Save and |
Disabled |
|
Restore |
|
|
|
|
|
22 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
2 |
INSTALLING THE SWITCH |
|
This chapter contains supplemental information on setting up your Switch 4500. These details are intended to be read together with the printed documents that accompany your switch.
Package Contents |
■ |
Switch unit |
|
■ |
Unit Information Labels |
|
■ |
Warranty Information |
|
■ |
RPS Flyer |
|
■ |
Power Cord |
|
■ Console Cable (RJ-45) |
|
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■ RPS -48V DC Connector and backshell (3CR17571-91 and |
|
|
|
3CR17572-91 only) |
|
|
■ RPS Connector Cable Tie |
|
|
■ Earthing Lead |
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■ 2 x Front securing brackets |
|
|
■ |
4 x Screws |
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■ 2 x Back securing brackets and 2 x Screws (3CR17571-91 and |
|
|
|
3CR17572-91 only) |
|
■ 4 x Rubber feet |
|
|
■ |
Important Information Notice |
|
■ Safety and Regulatory Information |
24 CHAPTER 2: INSTALLING THE SWITCH
Important Steps |
Before proceeding, make sure to access the Switch 4500 information on |
Before Proceeding |
3Com’s Web site at www.3Com.com and: |
|
■ Read the document entitled “3Com Switch Family Safety and |
|
Regulatory Information,” which contains information on how to |
|
set-up your Switch 4500 and all the safety and regulatory warnings. |
|
■ Refer to the document entitled “Important Information” for |
|
instructions on how to retrieve the latest documentation and software |
|
for your switch. |
|
■ Set-up your switch in the desired location. |
|
■ Download the documentation to your local hard-drive or to an |
|
accessible server. |
|
|
Connecting a |
The Switch 4500 PWR 26 and 50 port have a -48V DC Redundant Power |
Redundant Power |
Supply socket that can be used in addition to the standard AC connection |
Supply to your |
of the switch. If you intend to use this DC connection, please read this |
Switch 4500 PWR |
section. |
|
WARNING: The installation of the Redundant Power Supply (RPS) should |
|
only be carried out by properly trained and qualified personnel. |
|
WARNING: These instructions must be read in conjunction with the RPS |
|
flyer and the safety and installation instructions supplied with your RPS. |
|
WARNING: When powering any Switch 4500 PWR from an RPS, the unit |
|
must be earthed (grounded). This can be achieved by either connecting |
|
the power cord to the unit or by connecting the earth terminal on the |
|
rear of the unit to a reliable electrical earth, or by connecting both. You |
|
must ensure that the earth connection is made before connecting the DC |
|
supply from the RPS. |
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3Com Switches which support -48V DC RPS inputs, that are PoE enabled, |
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can only be powered by an RPS which complies with the isolation |
|
requirements of IEEE-Std 802.3af. Non PoE enabled switches do not have |
|
this restriction. |
WARNING: A standard 'positive-earthed' -48V redundant power system suitable for use with telecommunications equipment should not be used
Connecting a Redundant Power Supply to your Switch 4500 PWR 25
with the 3Com Power-over-Ethernet (PoE) network switches. In order to meet the IEEE 802.3af (PoE) specification, the -48V output must be isolated from earth (ground) and meet the isolation requirements in that specification.
26 CHAPTER 2: INSTALLING THE SWITCH
WARNING: Any RPS must be approved as a SELV output in accordance with IEC 60950-1/UL 60950-1/EN 60950-1.
WARNING: The characteristics of the Switch 4500 DC supply input are given in Appendix B on page 91.
The Switch 4500 PWR units can be powered in three different ways:
■AC Mains only — does not offer any power redundancy. If the AC mains supply or the AC power supply fail, the Switch will power off.
■AC Mains and -48V DC (primary supply) — the internal AC supply acts as the backup in the event of a DC power failure.
■DC only — the Switch does not need an AC supply and the resiliency is provided by the DC supply. This is useful in an environment where only DC power is available.
The RPS provides three main benefits to the customer:
■Power Redundancy — if a Switch is powered from the mains supply unit, a failure of the internal power supply will cause the Switch to fail. This can be overcome by connecting both the AC and DC RPS supplies to the Switch. Additional redundancy can also be added to the DC power by using (N+1) DC power supplies to further increase the availability of the system.
■Uninterruptible Power — the system allows easy connection and maintenance of batteries to the RPS shelf to further increase the availability of the system.
■Additional Power to PoE Ports — the internal AC Power Supply of a PoE Switch can provide enough power for most network applications. The RPS can be used to supplement additional power (up to a maximum of 15.4W), including full backup of all PoE devices on the network.
Table 6 below, outlines the behavior of the Switch when changes occur to the power system, such as removing the AC mains cable when the RPS is attached. The responses to the different power inputs are controlled by the Switch’s internal power supply and not by the RPS.
Connecting a Redundant Power Supply to your Switch 4500 PWR 27
Table 6 Switch Power Inputs
Power Input before |
Power Input after |
Correct Response |
User Intervention |
User Intervention |
|
|
|
|
AC mains and RPS |
RPS only |
The unit remains powered by the RPS. |
AC mains and RPS |
AC mains only |
The unit is powered by the AC mains. |
|
|
PoE dropped on all ports, however |
|
|
the unit does not reset. PoE restarts |
|
|
powered by the remaining power |
|
|
from the AC mains. PoE ports will be |
|
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dropped depending on their preset |
|
|
priority level. |
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|
The total power available to the |
|
|
Switch may be less than when |
|
|
powered from the RPS. Some PoE |
|
|
ports may be dropped as they are |
|
|
unable to obtain the power they |
|
|
require. |
RPS only |
AC mains and RPS |
The unit remains powered by the RPS. |
AC mains |
AC mains and RPS |
The unit is powered by the RPS. PoE |
|
|
ports can be added. |
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|
|
Specifying the |
3Com’s redundant power solution allows the use of any off-the-shelf |
Redundant Power |
-48V DC RPS that meets the requirements defined in Appendix B on |
System |
page 91. |
|
For an approved vendor list, more details about purchasing the 3Com |
|
recommended RPS and a full set of requirements go to: |
http://www.3Com.com/RPS
The 3Com recommended RPS generates -48V DC power using power supply units (or rectifiers). The outputs of the rectifier(s) are connected together so that the total -48V power available can be increased by adding additional rectifiers. For example, three 1500W rectifiers can provide up to 4500W. Hot removal or insertion of a rectifier will not affect the -48V DC output voltage.
Table 7 shows an example of the total power available from a number of 1500W rectifiers.
A minimum of two rectifiers are required for each shelf to provide N+1 rectifier redundancy.
28 CHAPTER 2: INSTALLING THE SWITCH
Table 7 Power Availability
|
|
|
Rectifiers |
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|
|
|
1 |
2 |
3 |
4 |
5 |
6 |
|
|
|
|
|
|
|
No Rectifier |
1500W |
3000W |
4500W |
6000W |
7500W |
9000W |
Redundancy |
|
|
|
|
|
|
N+1 Rectifier |
- |
1500W |
3000W |
4500W |
6000W |
7500W |
Redundancy |
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The -48V DC power distribution provides the mechanism to connect to the Switch 4500 PWR. The distribution consists of a number of circuit breakers and connection terminals for the positive (common) and negative -48V outputs. Each Switch 4500 PWR must be individually connected to a circuit breaker terminal.
A battery can also be connected to battery terminals prior to the DC power distribution to provide uninterrupted power in order to protect against the loss of AC mains power.
3Com’s RPS solution uses -48V DC power distribution. The RPS system provides bulk -48V DC power that is separately distributed to a number of network switches.
Each RPS consists of a shelf which can house from one to six rectifiers, a
Distribution Module and a Management Module.
Connecting the When connecting the RPS to the Switch, the circuit breaker and 2-core Switch to the cable need to be matched to the power rating of the Switch. Table 8 Redundant Power shows the recommended circuit breaker and cable rating for the Switch
System 4500. The recommended cable length should not exceed 3 metres (9.84 feet).
Table 8 Switch 4500 Circuit Breaker and Cable Ratings
|
Circuit Breaker |
Minimum 2-Core Cable Diameter |
|
|
|
Non PoE |
6A C type |
18 AWG (solid or stranded cable) |
PoE |
25A C type |
12 AWG (solid or stranded cable) |
|
|
|
WARNING: RPS Manufacturers recommendations must be followed when connecting the cable to the RPS.
Connecting a Redundant Power Supply to your Switch 4500 PWR 29
WARNING: Ensure that the circuit breaker in the RPS is in the open (off) position when connecting the cable to the RPS and the cable and connector to the Switch.
WARNING: You must ensure that the positive terminal on the Switch is connected to the positive (common) terminal of the RPS and that the negative terminal on the Switch is connected to the negative (circuit breaker) terminal of the RPS.
Figure 7 shows how to connect the power supply to the RPS socket in the back of the Switch. Use the cable tie supplied with your Switch to support the cable at the rear of the RPS connector as shown.
Figure 7 RPS Connection to the Switch
|
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+ |
- NULL |
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;1.0A |
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~100 |
;50/60Hz |
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-240V |
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NULL |
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Cable Tie |
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-48 |
-60V;2 0A |
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Null |
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Pinout |
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- |
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+ |
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When the RPS is connected to the Switch, the circuit breaker in the RPS can be moved to the closed (on) position and the Switch will be powered by the -48V DC power.
30 CHAPTER 2: INSTALLING THE SWITCH
The -48V DC power will take priority over the AC mains and will power the Switch if it is connected.
Connecting the Use the earthing cable that accompanies your Switch if the length is Earthing Cable suitable. Alternatively use the earthing cable specification as defined in
Appendix B on page 91.
The earthing cable is only required if the Switch is powered by the RPS only.
The recommended cable length should not exceed 3 metres (9.84 feet).
RPS LED The RPS status LED on the front of the Switch 4500 PWR indicates the status of the RPS and AC supplies as shown in Table 9.
Table 9 RPS LED Colors
Color |
State |
|
|
Green |
AC and RPS supply connected. |
Yellow |
AC failed or not connected. RPS supply is ok. |
Off |
There is no RPS supply connected. |
|
|
Using Power over The Switch 4500 Power over Ethernet (PoE) units can supply power to Ethernet any IEEE 802.3af compliant device through any of its 10/100 ports over a
Category 5 or Category 5e Ethernet cable. The same cable connects the device to the network.
Power over Ethernet is a self-configuring protocol. When you plug a PoE compliant device into one of the ports on the Switch, the Switch will supply the power required to the device, providing that the total power budget for the Switch would not be exceeded by doing so.
A PoE Switch combines the functionality of a standard Ethernet Switch with a single power supply that can power multiple devices. Using a PoE Switch has the following advantages over an unpowered network:
■Reduced Cabling — a PoE (802.3af) compliant device which has its power supplied over its ethernet cable does not require a separate power supply. If, for example, the Switch is used to connect a 3Com 11 Mbps Wireless LAN Access Point 8500 to the network, then only a