3Com 3CR17571-91, 3CR17561-91 Getting Started Manual

Switch 4500 Family

Getting Started Guide

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)

www.3Com.com

Part No. 10015034 Published March 2006

3Com Corporation 350 Campus Drive Marlborough, MA 01752-3064

Copyright © 2006, 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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If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

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CONTENTS

ABOUT THIS GUIDE

Before You Start 9

Release Notes 9

About Your CD-ROM 10 Conventions 10 Related Documentation 11

Accessing Online Documentation 12 Documentation Comments 12

1 INTRODUCING THE SWITCH 4500 FAMILY

About the Switch 4500 14

Summary of Hardware Features 15 Switch 4500 — Front View Detail 15

10BASE-T/ 100BASE-TX Ports 17

Gigabit Ports 17

Console Port 17

Unit LED 18

LEDs 18 Switch 4500 — Rear View Detail 20

Power Socket 20

Open Book Warning Labels 20

Redundant Power System Socket 21 Default Settings 21

2 INSTALLING THE SWITCH

Package Contents 24 Choosing a Suitable Site 25 Rack-mounting 26

Rack Mounting the Back of your Switch 4500 (PWR only) 27

Connecting a Redundant Power Supply to your Switch 4500 PWR 28

Specifying the Redundant Power System 30 Connecting the Switch to the Redundant Power System 31 Connecting the Earthing Cable 33 RPS LED 33

Using Power over Ethernet 33 Placing Units On Top of Each Other 34 The Power-up Sequence 35

Powering-up the Switch 4500 35

Checking for Correct Operation of LEDs 35

Choosing the Correct Cables 35

Choosing the Correct Cables for the 1000BASE-X SFP Ports 37 SFP Operation 38

Approved SFP Transceivers 38

Inserting an SFP Transceiver 39

Removing an SFP Transceiver 40 Packing and Shipping the Switch 4500 40

3 SETTING UP FOR MANAGEMENT

Methods of Managing a Switch 42

Command Line Interface Management 42

Command Line Interface Management using SSH 43

Web Interface Management 43

SNMP Management 43 Setting Up Overview 44

IP Configuration 45

Preparing for Management 46 Manually Configuring IP Information 47

Connecting to the Console Port 47

Connecting to a Front Panel Port 50

Viewing Automatically Configured IP Information 53

Using 3Com Network Director 54 Connecting to the Console Port 54

Setting Up Command Line Interface Management 56

User Interface Overview 56 CLI Management via the Console Port 56

CLI Management over the Network 56 Setting Up Command Line Interface Management using SSH 57 Setting Up Web Interface Management 58

Pre-requisites 58

Web Management Over the Network 59 Setting Up SNMP Management V1 or V2 59

Pre-requisites 60 Default Users and Passwords 60

4 CREATING A STACK

How To Interconnect Units 63 Guidelines For Interconnecting Units 64 Unit Numbering within the Stack 65

5 PROBLEM SOLVING

Solving Problems Indicated by LEDs 68 Solving Hardware Problems 69 Solving Communication Problems 71 Solving Stack Formation Problems 73

6 UPGRADING SOFTWARE

The Contents of the Executable File 76 Upgrading from the Command Line Interface 76

Introduction 76

Backup 78

TFTP 78

FTP

(via a network port) 80

XModem (via the console cable) 81

Upgrading from the Bootrom Interface 82

Introduction 82 TFTP 84 FTP 84 XModem 85

Bootrom Upgrade 86

Bootrom Upgrade via TFTP 87

Bootrom Upgrade via FTP 87

Bootrom Upgrade via XModem 88

A SAFETY INFORMATION

Power Cord Set — Japan 92 Important Safety Information 92 L’information de Sécurité Importante 95 Wichtige Sicherheitsinformationen 99 Información de Seguridad Importante 102 Importanti Informazioni di Sicurezza 105 Wa¿ne informacje o zabezpieczeniach 108

B PIN-OUTS

Null Modem Cable 111 PC-AT Serial Cable 111 Modem Cable 112 Ethernet Port RJ-45 Pin Assignments 112

C TECHNICAL SPECIFICATIONS

Switch 4500 (26 Port) 115 Switch 4500 (50 Port) 116 Switch 4500 PWR (26 Port) 117 Switch 4500 PWR (50 Port) 118 RPS 119 Earthing Lead 119

D OBTAINING SUPPORT FOR YOUR PRODUCT

Register Your Product 121 Purchase Value-Added Services 121 Troubleshoot Online 122 Access Software Downloads 122 Telephone Technical Support and Repair 122 Contact Us 123

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

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).

Before You Start This section contains information about the documents and CD-ROM

that accompany your Switch 4500.

Release Notes The Release Notes provide important information about the current

software release, including new features, modifications, and known problems. You should read the Release Notes before installing the Switch in your network.

If the information in the Release Notes differ from the information in this guide, follow the instructions in the Release Notes.

10 ABOUT THIS GUIDE

About Your CD-ROM The CD-ROM contains the following:

■ Online documentation for the Switch 4500 — refer to Related

Documentation on page 11 for details.

■ A link to 3Com Network Director software.

■ A number of other useful links.

The latest versions of user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) or HTML on the 3Com World Wide Web site:

http://www.3com.com/

Conventions Table 1 and Table 2 list conventions that are used throughout this guide.

Tab le 1 Notice Icons

Icon Notice Type Description

Information note Information that describes important features or

instructions

Caution Information that alerts you to potential loss of data or

potential damage to an application, system, or device

Warning Information that alerts you to potential personal injury

Tab le 2 Text Conventions

Convention Description

Screen displays This typeface represents information as it appears on the

screen.

Syntax The word “syntax” means that you must evaluate the syntax

provided and then supply the appropriate values for the placeholders that appear in angle brackets. Example:

To change your password, use the following syntax:

system password <password>

In this example, you must supply a password for <password>.

Commands The word “command” means that you must enter the

command exactly as shown and then press Return or Enter. Commands appear in bold. Example:

To display IP information, enter the following command:

display ip interface br

Related Documentation

In addition to this guide, each Switch documentation set includes the following:

■ Switch 4500 Configuration Guide

This guide contains information on the features supported by your

Switch and how they can be used to optimize your network. It is

supplied in PDF format on the CD-ROM that accompanies the Switch.

■ Switch 4500 Quick Reference Guide

This guide contains:

■ a list of the features supported by the Switch.

■ a summary of the command line interface commands for the

Switch. This guide is also available under the Help button on the web interface.

■ Switch 4500 Command Reference Guide

This guide provides detailed information about the web interface and

command line interface that enable you to manage the Switch. It is

supplied in PDF format on the CD-ROM that accompanies the Switch.

■ Release Notes

These notes provide information about the current software release,

including new features, modifications, and known problems. The

Release Notes are supplied in hard copy with your Switch.

12 ABOUT THIS GUIDE

Accessing Online

Documentation

Documentation Comments

To access the documentation on the CD-ROM supplied with your Switch, do the following:

1 Insert the CD-ROM into your CD-ROM drive. If your PC has auto-run

enabled, a splash screen will be displayed automatically.

2 Select the Documentation section from the contents page.

If the online documentation is to be accessed from a local drive or server, you will need to access the CD-ROM contents via the root directory and copy the files from the CD-ROM to a suitable directory.

■ The PDF Command Reference Guide is stored in the Docs directory on

the CD-ROM.

■ The PDF Configuration Guide is stored in the Docs directory of the

CD-ROM.

Your suggestions are very important to us. They will help make our documentation more useful to you. Please e-mail comments about this document to 3Com at:

pddtechpubs_comments@3com.com

Please include the following information when commenting:

■ Document title

■ Document part number (on the title page)

■ Page number (if appropriate)

Example:

Part Number DUA1756-1AAA01 Switch 4500 Family Getting Started Guide

Page 21

Please note that we can only respond to comments and questions about 3Com product documentation at this e-mail address. Questions related to technical support or sales should be directed in the first instance to your network supplier.

INTRODUCING THE 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

14 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY

About the Switch 4500

The Switch 4500 Family are mixed media devices. Table 3 summarizes what each Switch consists of:

Tab le 3 Switch 4500 Family Hardware

Switch 4500 Family

Switch 4500 26 Port 24 2* 2* 1

Switch 4500 50 Port 48 2* 2* 2† 1

Switch 4500 PWR 26 Port 24 2* 2* 2† 1 1

Switch 4500 PWR 50 Port 48 2* 2* 2† 1 1

10BASE-T\100BASE-TX Ports

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

* 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 10- and 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 the CD-ROM that accompanies the Switch.

Switch 4500 — Front View Detail 15

Summary of

Hardware Features

Table 4 summarizes the hardware features that are supported by the Switch 4500.

Tab le 4 Hardware Features

Feature Switch 4500

Addresses Up to 8,000 supported

Auto-negotiation Supported on all non-SFP ports

Forwarding Modes Store and Forward

Duplex Modes Half and full duplex on all ports

Auto MDI/MDIX Supported on all ports. If fiber SFP transceivers are

used, Auto MDIX is not supported.

Flow Control In full duplex operation all ports are supported

Traffic Prioritization Supported (using the IEEE Std 802.ID, 1998 Edition):

Eight traffic queues per port

Power over Ethernet Supported on 10/100 ports (3CR17571-91 and

3CR17572-91 only)

Ethernet and Fast Ethernet Ports

Gigbait Ethernet Ports Auto-neogotiating 10BASE-T/100BASE-TX/

SFP Ethernet Ports Supports fiber Gigabit Ethernet short-wave (SX),

RPS Supplemental PoE Power

Mounting 19-inch rack or stand-alone mounting

Auto-negotiating 10BASE-T/100BASE-TX ports

1000BASE-T ports (3CR17561-91) only

long-wave (LX), long-haul (LH70) and copper (T) transceivers in any combination.

Connects to -48v DC supply (3CR17571-91 and 3CR17572-91 only)

Switch 4500 — Front View Detail

Port Status LEDs

Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex

10/100BASE-TX

10/100BASE-TX Ports

Figure 1 Switch 4500 26-Port — front view

2625

1000BASE-X

Combo Port

Pair

10/100/1000BASE-T

Combo Port Pair

Console Port

28/26

27/25

10/100/1000BASE-T

Unit LED

3CR17561-91 SuperStack 3 Switch 4500 26-Port

Power LED

16 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY

Figure 2 Switch 4500 50-Port — front view

Port Status LEDs

Duplex:Green = Full Duplex, Yellow = Half DuplexSpeed:Green = 100Mbps, Yellow = 10Mbps

10/100BASE-TX Ports

Figure 3 Switch 4500 26-Port PWR - front view

Port Status LEDs

Speed: (100Base-TX) Gr een = 100Mbps Ye llow = 10Mbps Duplex: Gr een = Full Duplex, Ye llow = Half Duplex Powe r : Gr een = Delivering Powe r, Ye llow = Fault, Flashing Gr een = Over Budget

10/100BASE-TX

10/100BASE-TX Ports

Figure 4 Switch 4500 50-Port PWR - front view

Console Por t

1000Base-X SFP Ports

(Two pairs of Combo Ports

fitted with two 1000BASE-T

SFP transceivers in last two ports)

28/26

27/25

Console Port

3CR17562-91 SuperStack 3 Switch 4500 50-Port

Unit LE D

3CR17571-91 SuperStack 3 Switch 4500 PWR 26-Port

Mode

RPS

Gr een=Speed Ye llow=Duplex Flashing=PoE

PW R

Mode LED

Unit LED

1000BASE-X SFP Ports

(Two pairs of Combo Ports

fitted with two1000BASE-T SFP

transceivers in last two ports)

PWR LED

51/49

RPS LE D

Power LE D

52/50

RPS LED

PWR RPS

Port Status LEDs

Console Port

Unit LED

PWR LED

Mode LED

Duplex:Green = Full Duplex, Yellow = Half DuplexSpeed:Green = 100Mbps, Yellow = 10Mbps

Power:Green = Deliverng Power. Yellow=Fault, Flashing Green=Over Budget

10/100BASE-TX Ports

3CR17572-91 SuperStack 3 Switch 4500 PWR 50-Port

SFP transceivers in last two ports)

1000BASE-X SFP Ports

(Two pairs of Combo Ports

fitted with two 1000BASE-T

Mode Green=Speed Yellow=Duplex Flashing=PoE

51/49

52/50

PWR RPS

RPS LED

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 17

10BASE-T/

100BASE-TX Ports

The Switch 4500 has 24 or 48 auto-negotiating 10BASE-T/100BASE-TX 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.

Gigabit Ports The Switch 4500 26 Port has two 1000BASE-X SFP ports and two

10/100/1000BASE-T ports, which are implemented as dual personality combination ports pairing one 1000BASE-X and one 10/100/1000BASE-T port. Only one port in each pair can be enabled at any one time.

The Switch 4500 50 Port, 50 Port PWR, and 26 Port PWR models each have four 1000BASE-X Small Form Factor Pluggable (SFP) ports. These also are implemented as two pairs of dual personality combination ports. The port pairings of the 26-Port PWR model are: Port 25 with Port 27; Port 26 with Port 28. The port pairings of the 50-Port models are: Port 49 with Port 51; Port 50 with Port 52. Only one port in each pair can be enabled at any one time.

Two 1000BASE-T SFP modules are inlcuded with these switches and can be used for uplinks or stacking using copper Ethernet cabling. While usable in any of the SFP ports, 3Com recommends these SFP modules be installed in the two right-most ports of the switches (27/28 or 51/52).

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.

Console Port The console port allows you to connect a terminal and perform remote or

local out-of-band management. As the console port on the Switch is an RJ-45 port, you will need to connect an RJ-45 to DB9 converter cable to a standard null modem cable in order to connect a terminal.

18 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY

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 68

LEDs Table 5 lists LEDs visible on the front of the Switch, and how to read their

status. For information on using the LEDs for problem solving, see “Solving Problems Indicated by LEDs” on page 68.

Tab le 5 LED Behavior

LED Color Indicates

Unit LED

Green Power On Self Test (POST) is in progress. During POST a the

Green flashing The Switch has failed POST. The Unit LED flashes the

Green flashing ‘f’ There has been a fan failure.

Green flashing ‘t’ The Switch is over temperature and unit temperature is

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

Mode LED (3CR17571-91 and 3CR17572-91 only)

Speed Green 10/100 Port Speed and Activity, 1000 SFP Status and

Duplex Yellow 10/100 Duplex and Activity, 1000 SFP Duplex and Activity,

PoE Red 10/100 Port showing PoE Information

test ID number appears in the Unit LED (seven segment display).

Software download is in progress. During software download, a clockwise cycling bar appears in the Unit LED.

number of the test that has failed.

critical.

Power Supply Unit.

Activity, or Stack Status and Activity.

or Stack Activity

Switch 4500 — Front View Detail 19

LED Color Indicates

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.

20 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY

Switch 4500 — Rear View Detail

Power Socket

100-240V; 50/60Hz; 1A

Power Socket

NULL

100-240V; 50/60Hz; 7.0A

Redundant Power System Socket

Power Socket The Switch automatically adjusts its power setting to any supply voltage

-53 -55V;19.5A

Figure 5 Switch 4500 — rear view

Open Book Warning Labels

Earthing Screw

Figure 6 Switch 4500 PWR - rear view

Open Book Warning Labels

Earthing Screw

in the range 100-240 VAC.

Open Book Warning

Labels

Before installing or removing any components from the Switch 4500 or 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.

Default Settings 21

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

System Socket

Provides supplemental power for PoE ports (up to 15.4w on all ports) and redundant power for powered devices and the Switch itself.

Default Settings Table 6 shows the default settings for the Switch 4500 Family:

Tab le 6 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 Protocol (LACP)

IP Multicast Filtering Filtering enabled

Rapid Spanning Tree Protocol Enabled

Fast Start Enabled on front panel ports

RMON Alarm Enabled

Disabled per port

22 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY

Feature Switch 4500

Traffic Prioritization All ports prioritize NBX VoIP traffic (LAN and IP).

Port Security Disabled per port

Configuration Save and Restore

All ports set to “best effort” for all other traffic.

Disabled

INSTALLING THE SWITCH

This chapter contains the information you need to install and set up the Switch 4500. It covers the following topics:

■ Package Contents

■ Choosing a Suitable Site

■ Rack-mounting

■ Connecting a Redundant Power Supply to your Switch 4500 PWR

■ Placing Units On Top of Each Other

■ The Power-up Sequence

■ SFP Operation

WARNING: Safety Information. Before installing or removing any components from the Switch 4500 or carrying out any maintenance procedures, you must read the safety information provided in Appendix A of this guide.

AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever tout composant du Switch 4500 ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans l'Appendice A de ce guide.

VORSICHT: Sicherheitsinformationen. Bevor Sie Komponenten aus dem Switch 4500 entfernen oder dem Switch 4500 hinzufuegen oder Instandhaltungsarbeiten verrichten, lesen Sie die Sicherheitsanweisungen, die in Appendix A (Anhang A) in diesem Handbuch aufgefuehrt sind.

ADVERTENCIA: Información de seguridad. Antes de instalar o extraer cualquier componente del Switch 4500 o de realizar tareas de mantenimiento, debe leer la información de seguridad facilitada en el Apéndice A de esta guía del usuario.

24 CHAPTER 2: INSTALLING THE SWITCH

AVVERTENZA: Informazioni di sicurezza. Prima di installare o rimuovere qualsiasi componente dal Switch 4500 o di eseguire qualsiasi procedura di manutenzione, leggere le informazioni di sicurezza riportate nell'Appendice A della presente guida per l'utente.

OSTRZEŻENIE: Informacje o zabezpieczeniach. Przed instalacją lub usunięciem jakichkolwiek elementów z product lub przeprowadzeniem prac konserwacyjnych należy zapoznać się z informacjami o bezpieczeństwie zawartymi w Załączniku A niniejszego podręcznika.

Package Contents ■ Switch unit

■ CD-ROM (includes documentation related to your Switch)

■ Getting Started Guide (this guide)

■ Release Notes

■ Unit Information Labels

■ Warranty Information

■ RPS Flyer

■ Power Cord

■ Console Cable (RJ-45)

■ RPS -48V DC Connector and backshell (3CR17571-91 and

3CR17572-91 only)

■ RPS Connector Cable Tie

■ Earthing Lead

■ 2 x Front securing brackets

■ 4 x Screws

■ 2 x Back securing brackets and 2 x Screws (3CR17571-91 and

3CR17572-91 only)

■ 4 x Rubber feet

Choosing a Suitable Site 25

Choosing a Suitable Site

The Switch is suited for use on a desktop, either free standing or mounted in a standard 19-inch equipment rack. Alternatively, the Switch can be mounted in a wiring closet or equipment room. A rack-mounting kit containing two mounting brackets is supplied with the Switch.

CAUTION: Ensure that the ventilation holes are not obstructed.

When deciding where to position the Switch, ensure that:

■ Cabling is located away from:

■ sources of electrical noise such as radios, transmitters and

broadband amplifiers.

■ power lines and fluorescent lighting fixtures

■ The Switch is accessible and cables can be connected easily.

■ Water or moisture cannot enter the case of the Switch.

■ Air flow is not restricted around the Switch or through the vents in the

side of the Switch. 3Com recommends that you provide a minimum of

25mm (1in.) clearance.

■ Air temperature around the Switch does not exceed 40 °C (104 °F).

If the Switch is installed in a 19-inch rack or closed assembly its local air temperature may be greater than room ambient temperature.

■ The air is as free from dust as possible.

■ The unit is installed in a clean, air conditioned environment.

■ No more than eight Switch units are placed on top of one another, if

the units are free-standing.

■ The Switch is situated away from sources of conductive (electrical)

dust, for example laser printers.

■ The AC supply used by the Switch is separate to that used by units

that generate high levels of AC noise, for example air conditioning

units and laser printers.

26 CHAPTER 2: INSTALLING THE SWITCH

Rack-mounting The Switch 4500 is 1U high and will fit in most standard 19-inch racks.

CAUTION: Disconnect all cables from the Switch before continuing. Remove all self adhesive pads from the underside of the Switch if they have been fitted.

To rack-mount your Switch 4500:

1 Place the Switch the right way up on a hard flat surface, with the front

facing towards you.

2 Locate a mounting bracket over the mounting holes on one side of the

front of the Switch, as shown in Figure 7.

Figure 7 Fitting a front bracket for rack-mounting

3 Insert the two screws and tighten with a suitable screwdriver.

You must use the screws supplied with the mounting brackets. Damage caused to the unit by using incorrect screws invalidates your warranty.

4 Repeat steps 2 and 3 for the other side of the Switch.

5 Insert the Switch into the 19-inch rack and secure with suitable screws

(not provided). Ensure that ventilation holes are not obstructed.

6 Connect network cabling.

Rack-mounting 27

Rack Mounting the

Back of your Switch

4500 (PWR only)

To rack mount the back of your Switch 4500 (PWR only):

1 Locate a rear rail bracket over the mounting holes on one side of the rear

of the Switch, as shown in Figure 8.

The bracket has two mounting positions depending on the rack depth. Table 7 shows the correct positions to mount the bracket:

Tab le 7 Rear rail rack mounting points

Distance from Front to Rear Mounting Positions

37cm — 25cm Middle mounting point

43cm — 56cm Rear mounting point

2 Insert the screw and tighten with a suitable screwdriver.

3 Repeat steps 1 and 2 for the other rear securing bracket.

Figure 8 Fitting a rear rail bracket for rack-mounting

4 Insert the Switch into the 19-inch rack and secure with suitable screws

(not provided). Ensure that ventilation holes are not obstructed.

5 Connect network cabling.

28 CHAPTER 2: INSTALLING THE SWITCH

6 Finally, place a unit information label on the unit in an easily accessible

position. The unit information label shows the following:

■ 3Com product name of the Switch

■ 3Com 3C number of the Switch

■ Unique MAC address (Ethernet address) of the Switch.

■ Serial number of the Switch

You may need this information if you contact 3Com Technical Support.

Connecting a Redundant Power Supply to your Switch 4500 PWR

The Switch 4500 PWR 26 and 50 port have a -48V DC Redundant Power Supply socket.

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.

3Com Switches which support -48V DC RPS inputs, that are PoE enabled, 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 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.

Connecting a Redundant Power Supply to your Switch 4500 PWR 29

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 C on page 115.

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 8 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.

30 CHAPTER 2: INSTALLING THE SWITCH

Tab le 8 Switch Power Inputs

Specifying the

Redundant Power

System

Power Input before 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.

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

Power Input after User Intervention

Correct Response

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 dropped depending on their preset priority level.

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.

ports can be added.

3Com’s redundant power solution allows the use of any off-the-shelf

-48V DC RPS that meets the requirements defined in Appendix C on page 115.

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 9 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.

+ 98 hidden pages

3Com 3CR17571-91, 3CR17561-91 Getting Started Manual

Specifications and Main Features

Frequently Asked Questions

User Manual