3com SuperStack 3C17304 User manual

http://www.3com.com/

Part No. DUA1730-0AAA04

Published July 2005

SuperStack

®

3

Switch 4200 Family

Getting Started Guide

Switch 4226T (3C17300)

Switch 4250T (3C17302)

Switch 4228G (3C17304)

DUA1730-0AAA04.book Page 1 Thursday, November 17, 2005 2:59 PM

3Com Corporation

350 Campus Drive

Marlborough, MA

01752-3064

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 Technologies.

3Com Technologies reserves the right to revise this documentation and to make changes in content from time

to time without obligation on the part of 3Com Technologies to provide notification of such revision or

change.

3Com Technologies provides this documentation without warranty, term, or condition of any kind, either

implied or expressed, including, but not limited to, the implied warranties, terms or conditions of

merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or

changes in the product(s) and/or the program(s) described in this documentation at any time.

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.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are

provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense.

Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or

as a “commercial item” as defined in FAR

2.101(a) and as such is provided with only such rights as are

provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights

only as provided in DFAR 252.227-7015 (Nov

1995) or FAR 52.227-14 (June 1987), whichever is applicable.

You agree not to remove or deface any portion of any legend provided on any licensed program or

documentation contained in, or delivered to you in conjunction with, this User Guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not

be registered in other countries.

3Com, the 3Com logo and SuperStack are all registered trademarks of 3Com Corporation.

Novell and NetWare are registered trademarks of Novell Incorporated.

Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.

All other company and product names may be trademarks of the respective companies with which they are

associated.

Environmental Statement

It is a 3Com policy to be environmentally friendly in all operations. This manual is printed on paper that comes

from sustainable, managed European forests. The production process for making the pulp has a reduced AOX

level (adsorbable organic halogen) resulting in elemental chlorine-free paper.

The paper is fully biodegradable and recyclable.

DUA1730-0AAA04.book Page 2 Thursday, November 17, 2005 2:59 PM

CONTENTS

ABOUT THIS GUIDE

Conventions 8

Related Documentation 9

Accessing Online Documentation 10

1 INTRODUCING THE

SUPERSTACK 3 SWITCH 4200 FAMILY

About the Switch 4200 Family 12

Summary of Hardware Features 12

Switch 4200 Family — Front View Detail 13

10BASE-T/ 100BASE-TX Ports 14

10/100/1000BASE-T Ports 14

GBIC Ports 14

LEDs 15

Switch 4200 Family — Rear View Detail 17

Power Socket 17

Redundant Power System Socket 17

Console Port 17

Default Settings 18

2 INSTALLING THE SWITCH

Package Contents 20

Choosing a Suitable Site 20

Rack-mounting 21

Placing Units On Top of Each Other 23

Stacking Units 23

The Power-up Sequence 24

Powering-up the Switch 4200 Family 24

Checking for Correct Operation of LEDs 24

Connecting a Redundant Power System 25

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Choosing the Correct Cables 25

Choosing the correct Fiber cables 26

GBIC Operation 27

Approved GBIC Transceivers 27

Inserting a GBIC Transceiver 27

3 SETTING UP FOR MANAGEMENT

Setting Up Overview 32

IP Configuration 33

Preparing for Management 34

Manually Configuring IP Information 35

Connecting to a Front Panel Port 35

Connecting to the Console Port 38

Viewing Automatically Configured IP Information 42

Using 3Com Network Supervisor 42

Connecting to the Console Port 42

Methods of Managing a Switch 45

Command Line Interface Management 45

Web Interface Management 46

SNMP Management 46

Setting Up Command Line Interface Management 47

CLI Management via the Console Port 47

CLI Management over the Network 47

Setting Up Web Interface Management 48

Pre-requisites 48

Web Management Over the Network 49

Setting Up SNMP Management 49

Pre-requisites 50

Default Users and Passwords 50

Changing Default Passwords 50

4 PROBLEM SOLVING

Solving Problems Indicated by LEDs 54

Solving Hardware Problems 55

Solving Communication Problems 55

Solving Stack Formation Problems 56

Solving Software Upgrade Problems 57

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A SAFETY INFORMATION

Important Safety Information 60

L’information de Sécurité Importante 62

Wichtige Sicherheitsinformationen 64

B PIN-OUTS

Null Modem Cable 67

PC-AT Serial Cable 67

Modem Cable 68

RJ-45 Pin Assignments 68

C TECHNICAL SPECIFICATIONS

Switch 4226T

(3C17300) 71

Switch 4250T

(3C17302) 73

Switch 4228G

(3C17304) 74

D OBTAINING SUPPORT FOR YOUR PRODUCT

Register Your Product 75

Purchase Value-Added Services 75

Troubleshoot Online 76

Access Software Downloads 76

Telephone Technical Support and Repair 76

Contact Us 77

INDEX

REGULATORY NOTICES

DUA1730-0AAA04.book Page 5 Thursday, November 17, 2005 2:59 PM

DUA1730-0AAA04.book Page 6 Thursday, November 17, 2005 2:59 PM

ABOUT THIS GUIDE

This guide provides all the information you need to install and use a

SuperStack

®

3 Switch 4200 in its default state.

This guide is intended for use with the following Switch 4200 Family

models:

■ Switch 4226T (3C17300) — 24 10BASE-T/100BASE-TX ports,

2

10/100/1000BASE-T ports

■ Switch 4250T (3C17302) — 48 10BASE-T/100BASE-TX ports,

2

10/100/1000BASE-T ports

■ Switch 4228G (3C17304) — 24 10BASE-T/100BASE-TX ports,

2

10/100/1000BASE-T ports and 2 GBIC ports

All procedures described in this guide apply to all models except where

stated.

For details on the Switch 4200 26-Port (3C17300A), Switch 4200 50-Port

(3C17302A) and Switch 4200 28-Port (3C17304A), refer to the following

document:

■ SuperStack 3 Switch 4200 Family Getting Started Guide (part number

DUA1730-0AAA03)

available for download from the 3Com Web site, www.3Com.com.

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 that are shipped with your product

differ from the information in this guide, follow the instructions in the

release notes.

DUA1730-0AAA04.book Page 7 Thursday, November 17, 2005 2:59 PM

8 ABOUT THIS GUIDE

Most 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 Tab le 1 and Tab le 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 port information, enter the following command:

bridge port detail

The words “enter”

and

“type”

When you see the word “enter” in this guide, you must type

something, and then press Return or Enter. Do not press

Return or Enter when an instruction simply says “type.”

Keyboard key names If you must press two or more keys simultaneously, the key

names are linked with a plus sign (+). Example:

Press Ctrl+Alt+Del

DUA1730-0AAA04.book Page 8 Thursday, November 17, 2005 2:59 PM

Related Documentation 9

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

following:

■ SuperStack 3 Switch Implementation 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.

■ SuperStack 3 Switch Management Quick Reference Guide

This guide contains:

■ a list of the software features supported by the Switch.

■ a summary of the web interface and command line interface

commands for the Switch.

■ SuperStack 3 Switch Management Interface 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 HTML 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.

There are other publications you may find useful, such as:

■ Documentation accompanying the Advanced Redundant Power

system.

Words in italics Italics are used to:

■ Emphasize a point.

■ Denote a new term at the place where it is defined in the

text.

■ Identify menu names, menu commands, and software

button names. Examples:

From the Help menu, select Contents.

Click OK.

Table 2 Text Conventions (continued)

Convention Description

DUA1730-0AAA04.book Page 9 Thursday, November 17, 2005 2:59 PM

10 ABOUT THIS GUIDE

■ Documentation accompanying 3Com Network Supervisor. This is

supplied on the CD-ROM that accompanies the Switch.

Accessing Online

Documentation

The CD-ROM supplied with your Switch contains the following online

documentation:

■ SuperStack 3 Switch Management Quick Reference Guide (PDF

format)

■ SuperStack 3 Switch Implementation Guide (PDF format)

■ SuperStack 3 Switch Management Interface Reference Guide (HTML

format)

1 To access the documentation 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 HTML Reference Guide is stored in the Docs/reference directory

on the CD-ROM. The documentation is accessed using the

contents.htm file.

■ The PDF Implementation Guide is stored in the

Docs/implementation directory of the CD-ROM.

3Com recommends that you copy the Docs/reference directory as a

whole to maintain the structure of the files.

DUA1730-0AAA04.book Page 10 Thursday, November 17, 2005 2:59 PM

1

INTRODUCING THE

SUPERSTACK 3 SWITCH 4200

FAMILY

This chapter contains introductory information about the Switch 4200

Family 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 4200 Family

■ Switch 4200 Family — Front View Detail

■ Switch 4200 Family — Rear View Detail

■ Default Settings

This Getting Started Guide describes the following units in the Switch

4200 Family:

■ Switch 4226T (3C17300)

■ Switch 4250T (3C17302)

■ Switch 4228G (3C17304)

For details on the Switch 26-Port (3C17300A), Switch 50-Port

(3C17302A) and Switch 28-Port (3C17304A), refer to the following

document:

■ SuperStack 3 Switch 4200 Family Getting Started Guide (part number

DUA1730-0AAA03)

available for download from the 3Com Web site, www.3Com.com.

DUA1730-0AAA04.book Page 11 Thursday, November 17, 2005 2:59 PM

12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

About the Switch

4200 Family

The Switch 4200 Family are stackable 10/100/1000 Mbps devices which

consists of:

■ 24 or 48 10BASE-T/100BASE-TX ports

■ 2 10/100/1000BASE-T ports

■ 2 GBIC ports (Switch 4228G only)

The Switch provides high-performance workgroups with a backbone to

server connection. You can also add the Switch 4200 Family to any

SuperStack

®

system as your network grows.

Summary of

Hardware Features

Tab le 3 summarizes the hardware features that are supported by the

Switch 4200 Family.

Tab le 3 Hardware features

Feature Switch 4200 Family

Addresses ■ Up to 8000 supported

■ Up to 64 permanent entries

Auto-negotiation ■ Supported on all ports

■ Auto MDI/MDI-X

Forwarding Modes Store and Forward

Duplex Modes Half and full duplex on all 10/100 ports. Full duplex

on 1000BASE-T ports and full duplex on GBIC ports

Flow Control In full duplex operation all ports are supported

Smart Auto-sensing Supported on all ports except GBIC ports which are

single speed ports.

Smart auto-sensing allows auto-negotiating ports to

monitor and detect a high error rate on a link, or a

problem in the "physical" interconnection to

another port and react accordingly.

Traffic Prioritization Supported (IEEE 802.ID): 2 queues per port

Ethernet and Fast Ethernet

Ports

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

Gigabit Ethernet Auto-negotiating 10/100/1000BASE-T ports

GBIC Auto-negotiating GBIC ports (Switch 4228G only)

RPS Support Connects to SuperStack Advanced Redundant

Power System (ARPS) (3C16071, 3C16071A or

3C16071B)

Mounting 19-inch rack or stand-alone mounting

DUA1730-0AAA04.book Page 12 Thursday, November 17, 2005 2:59 PM

About the Switch 4200 Series 13

Switch 4200 Family

— Front View

Detail

Figure 1 Switch 4226T (3C17300) — front view

Figure 2 Switch 4250T (3C17302) — front view

Figure 3 Switch 4228G (3C17304) — front view

3C17300 Superstack 3 Switch 4226T

10BASE-T / 100BASE-TX

RJ-45 Ports

Power/

Self Test

Alert

Alert LED

21

91022

11

23 12 24

8

20

1

13

197

18

6

17

5

16

4

153

14

2

10/100/1000BASE-T

ports

26 / Down

25 / Up

Power / Self Test LED

Unit LEDs

1

2

3

4

Unit

3C17302 Superstack 3 Switch 4250T

10BASE-T / 100BASE-TX

RJ-45 Ports

Power / Self Test LED

Alert LED

8

32

1

25

31

7

30

6295

28

427

3

26

2

49

50

16

40

9

33

39

15

38

14

37

13361235

11

34

10

24

48

17

41

47

23462245

21

44

20

43

19

42

18

10/100/1000BASE-T

ports

Unit LEDs

Up

Down

Alert

Power/

Self Test

Unit

1

2

3

4

3C17304 Superstack 3

Switch 4228G

10BASE-T / 100BASE-TX

RJ-45 Ports

Power/

Self Test

Alert

Alert LED

21

91022

11

23 12 24

8

20

1

13

197

18

6

17

5

16

4

153

14

2

10/100/1000BASE-T

ports

26 / Down

25 / Up

Power / Self Test LED

Unit LEDs

1

2

3

4

Unit

GBIC ports

27

28

27

28

DUA1730-0AAA04.book Page 13 Thursday, November 17, 2005 2:59 PM

14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

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.

10BASE-T/

100BASE-TX Ports

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

configured as Auto MDIX (cross-over). While auto-negotiation is enabled,

these ports can automatically detect whether they need to operate in

MDI or MDIX mode. Alternatively, you can manually set these ports to

10BASE-T half duplex, 10BASE-T full 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.

10/100/1000BASE-T

Ports

The Switch has two auto-negotiating 10/100/1000BASE-T ports

configured as Auto MDIX (cross-over). While auto-negotiation is enabled,

these ports can automatically detect whether they need to operate in

MDI or MDIX mode. These ports provide 10/100/1000

Mbps full duplex

connections to other Gigabit Ethernet devices. Full duplex allows packets

to be transmitted and received simultaneously which, in effect, doubles

the potential throughput of a link. These ports require either

straight-through or cross-over Category

5 cables with RJ-45 connectors at

both ends. The maximum UTP cable length is 100 m (328

ft) over

Category 5 cable.

The 10/100/1000BASE-T ports will auto-negotiate to the appropriate

speed.

GBIC Ports This section applies to the SuperStack 3 Switch 4228G only.

The two GBIC ports support Category 5 twisted pair cable and fiber

Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul (LH70)

GBIC transceivers in any combination. This offers you the flexibility of

using GBIC transceivers to provide connectivity between the Switch and

remote 1000

Mbps workgroups or to create a high capacity aggregated

link backbone connection.

DUA1730-0AAA04.book Page 14 Thursday, November 17, 2005 2:59 PM

About the Switch 4200 Series 15

Fiber GBIC's.

The default state for these ports is auto-negotiation enabled, where

speed, duplex and flow control modes are negotiated. Because 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 and the flow control setting can be manually configured.

1000BASE-T GBIC's

These ports will auto-negotiate to 1000BASE-T, full duplex only. Although

it is not possible to disable auto-negotiation it is possible to change the

advertised capabilities for flow control support, effectively enabling or

disabling flow control.

LEDs Tab le 4 lists LEDs visible on the front of the Switch, and how to read their

status according to color. For information on using the LEDs for problem

solving, see

“Solving Problems Indicated by LEDs” on page 54.

It is not possible to determine the duplex mode from the LEDs. For more

detailed information, refer to the “SuperStack

3 Switch Management

Interface Reference Guide” on the CD-ROM that is supplied with the

Switch.

Tab le 4 LED behavior

LED Color Indicates

Port Status LEDs 10BASE-T/100BASE-TX ports

Green A 100 Mbps link is present and the port is enabled.

Green flashing Packets are being transmitted/received on the port.

Yellow A 10 Mbps link is present and the port is enabled.

Yellow flashing Packets are being transmitted/received on the port.

Green / Yellow

alternating

A 10 or 100 Mbps link is present, but the port is disabled.

Off No link is present.

Port Status LEDs GBIC ports

Green A 1000 Mbps link is present and the port is enabled.

Green flashing Packets are being transmitted/received on the port.

Port Status LEDs 10/100/1000BASE-T ports

Green A 1000 Mbps link is present and the port is enabled.

(continued)

DUA1730-0AAA04.book Page 15 Thursday, November 17, 2005 2:59 PM

16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

Green flashing Packets are being transmitted/received on the port.

Yellow A 10 or 100 Mbps link is present and the port is enabled.

Yellow flashing Packets are being transmitted/received on the port.

Green / Yellow

alternating

A 10, 100 or 1000 Mbps link present but disabled.

Off No link is present.

Unit LEDs

1–4 Green When the Switch forms a stack with other Switch 4200

Family units the LED indicates the position of the unit in the

stack and that a link is present. Unit LED number 1 can also

indicate a stand-alone Switch.

Off The Switch initialization process is not complete.

Power/Self Test LED

Green The Switch is powered-up and operating normally.

Green flashing The Switch is either downloading software or is initializing

(which includes running a Power On Self Test).

Yellow The Switch has failed its Power On Self Test.

Refer to Chapter 4 Solving Problems Indicated by LEDs.

Off The Switch is not receiving power or there is a fault with the

Power Supply Unit.

Alert LED

Green flashing The Switch Alert LED has been configured via the CLI or Web

Interface to flash.

Off The Switch Alert LED has been configured via the CLI or Web

Interface to be off (Default state).

LED Color Indicates

DUA1730-0AAA04.book Page 16 Thursday, November 17, 2005 2:59 PM

About the Switch 4200 Series 17

Switch 4200 Family

— Rear View Detail

Figure 4 Switch 4200 Family — rear view

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

in the range 90-240 VAC.

Redundant Power

System Socket

To protect against internal power supply failure, you can use this socket

to connect a Switch 4200 to a SuperStack Advanced Redundant Power

System (RPS). See

“Connecting a Redundant Power System” on page 25.

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

local out-of-band management. The console port uses a standard null

modem cable and is set to auto-baud, 8 data bits, no parity and 1 stop

bit.

Power Socket

Console

(max) 19200,8,1,N

Console Port

Supply Data Warning Label

Redundant Power System Socket

DUA1730-0AAA04.book Page 17 Thursday, November 17, 2005 2:59 PM

18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

Default Settings Tab le 5 shows the default settings for the Switch 4200 Family:

Tab le 5 Default Settings

If you initialize a Switch unit by selecting System > Control > Initialize in

the Web interface or by entering system control initialize

in

the Command Line Interface, the following settings are retained to allow

you to connect to and manage the Switch:

■ IP Address

■ Subnet Mask

■ Default Router

Feature Switch 4200 Family

Automatic IP Configuration Enabled

Port Status Enabled

Port Speed All ports are auto-negotiated

Duplex Mode All ports are auto-negotiated

Flow Control ■ Enabled in half duplex

■ Auto-negotiated in full duplex

Broadcast Storm Control Enabled

Virtual LANs (VLANs) All ports belong to the untagged Default VLAN

(VLAN

1) with 802.1Q learning operational

IP Multicast Filtering Filtering enabled

Rapid Spanning Tree Protocol

Fast Start:

Enabled

Enabled on all ports

RMON Alarm Enabled

Smart Auto-Sensing Enabled

LACP (10/100/1000BASE-T ports and GBIC ports only)

Enabled

Quality of Service (QoS) All ports prioritize NBX VoIP IP.

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

DUA1730-0AAA04.book Page 18 Thursday, November 17, 2005 2:59 PM

2

INSTALLING THE SWITCH

This chapter contains the information you need to install and set up the

Switch 4200 Family. It covers the following topics:

■ Package Contents

■ Choosing a Suitable Site

■ Rack-mounting

■ Placing Units On Top of Each Other

■ The Power-up Sequence

■ GBIC Operation

WARNING: Safety Information. Before installing or removing any

components from the Switch 4200 Family 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 4200 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 4200 entfernen oder dem Switch 4200 hinzufuegen oder

Instandhaltungsarbeiten verrichten, lesen Sie die Sicherheitsanweisungen,

die in Appendix A (Anhang A) in diesem Handbuch aufgefuehrt sind.

DUA1730-0AAA04.book Page 19 Thursday, November 17, 2005 2:59 PM

20 CHAPTER 2: INSTALLING THE SWITCH

Package Contents ■ Switch unit

■ CD-ROM

■ Getting Started Guide (this guide)

■ Release Notes

■ Unit Information Labels

■ Warranty Information

■ Power Cord

■ 2 x Mounting brackets

■ 4 x Screws

■ 4 x Rubber feet

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, as an aggregator

for other Hubs and Switches. 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.

DUA1730-0AAA04.book Page 20 Thursday, November 17, 2005 2:59 PM

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