3Com 3CR17661-91, 3CR17662-91, 3CR17660-91 User Manual

3Com® Switch 4200G Family

Getting Started Guide

4200G 12-Port (3CR17660-91) 4200G 24-Port (3CR17661-91) 4200G 48-Port (3CR17662-91)

www.3Com.com

Part No. 10014914 Rev. AA Published July 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.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation 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.

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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.

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DOWNLOAD THE LATEST

SOFTWARE AND DOCUMENTATION FOR YOUR 3COM SWITCH

Thank you for purchasing a 3Com Switch 4200G Family switch. As part of our commitment to bringing you the most capable and dependable network equipment, 3Com offers free software maintenance updates and documentation updates on our website.

To obtain the most up-to-date operating software and user documentation for the Switch 4200G, point your web browser to: www.3Com.com/4200G and select the “Support and Registration” link.

Please note that you must register your 3Com switch to receive the software upgrade. To register, point your web browser to

eSupport.3Com.com.

DOWNLOAD THE LATEST SOFTWARE AND DOCUMENTATION

FOR YOUR 3COM SWITCH

ABOUT THIS GUIDE

Before You Start 9

Release Notes 9

About Your CD-ROM 9 Conventions 10 Related Documentation 11

Accessing Online Documentation 11 Documentation Comments 12

1 INTRODUCING THE SWITCH 4200G FAMILY

About the Switch 4200G 14

Summary of Hardware Features 14 Switch 4200G—Front View Detail 15

10/100/1000BASE-T Ports 16

1000BASE-X SFP Ports 17

Console Port 17

Unit Status Display 17

LEDs 18 Switch 4200G — Rear View Detail 19

Power Socket 19

10 Gbps Interface Slots 19 Default Settings 20

6 CONTENTS

2 INSTALLING THE SWITCH

Package Contents 22 Choosing a Suitable Site 22 Rack-mounting 23 Placing Units On Top of Each Other 25 The Power-up Sequence 25

Powering-up the Switch 4200G 25 Checking for Correct Operation of LEDs 25

SFP Operation 26

Approved SFP Transceivers 26 Inserting an SFP Transceiver 26 Removing an SFP Transceiver 28

Choosing the Correct Cables 28

Choosing the Correct Cables for the Switch 4200G 29

3 SETTING UP FOR MANAGEMENT

Methods of Managing a Switch 32

Command Line Interface Management 32 Command Line Interface Management using SSH 33 Web Interface Management 33 SNMP Management 33

Setting Up Overview 34

IP Configuration 36 Preparing for Management 37

Manually Configuring IP Information 37

Connecting to the Console Port 38 Connecting to a Front Panel Port 41

Viewing Automatically Configured IP Information 44

Using 3Com Network Director 44 Connecting to the Console Port 45

Setting Up Command Line Interface Management 46

User Interface Overview 46 CLI Management using the Console Port 46

CLI Management over the Network 46 Setting Up Command Line Interface Management using SSH 47 Setting Up Web Interface Management 48

Prerequisites 48 Web Management Over the Network 49

Setting Up SNMP Management V1 or V2 50

Prerequisites 50 Default Users and Passwords 50 Configuration Conversion Utility 51

4 PROBLEM SOLVING

Solving Problems Indicated by LEDs 54 Solving Hardware Problems 55 Solving Communication Problems 57

5 UPGRADING SOFTWARE

Upgrade methods 59 Upgrading from the Command Line Interface 60

Check Flash Space Available 60

Backup Switch Software 61

Upgrade Using TFTP 61

Upgrade Using FTP (via network port) 63

XModem (using the console cable) 65 Upgrading from the Bootrom Interface 66

Introduction 66

TFTP 68

FTP 6 8

XModem 69 Upgrading the Bootrom 70

Bootrom Upgrade using TFTP 71

Bootrom Upgrade using FTP 71

Bootrom Upgrade using XModem 72

CONTENTS 7

8 CONTENTS

A SAFETY INFORMATION

Power Cord Set—Japan 76 Important Safety Information 76 L’information de Sécurité Importante 78 Wichtige Sicherheitsinformationen 81 Información de Seguridad Importante 82 Importanti Informazioni di Sicurezza 84 Ważne informacje o zabezpieczeniach 86

B PIN-OUTS

Null Modem Cable 89 PC-AT Serial Cable 89 Modem Cable 90 Ethernet Port RJ-45 Pin Assignments 90

C TECHNICAL SPECIFICATIONS

Switch 4200G 12-Port 93 Switch 4200G 24-Port 94 Switch 4200G (48-Port) 95

D OBTAINING SUPPORT FOR YOUR PRODUCT

Register Your Product 97 Purchase Value-Added Services 97 Troubleshoot Online 98 Access Software Downloads 98 Telephone Technical Support and Repair 98 Contact Us 99

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

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

3Com

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 4200G.

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.

Switch 4200G Family.

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

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

■ Online documentation for the Switch 4200G—refer to Related

Documentation on page 11 for details.

■ A link to 3Com Network Director software.

■ A number of other useful links.

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/

10 ABOUT THIS GUIDE

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

The words “enter” and “type”

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

Words in italics Italics are used to:

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.”

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

Press Ctrl+Alt+Del

■ 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.

Documentation Comments

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 10014914AA Switch 4200G 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.

1 INTRODUCING THE

SWITCH 4200G FAMILY

This chapter contains introductory information about the Switch 4200G 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 4200G

■ Switch 4200G—Front View Detail

■ Switch 4200G — Rear View Detail

■ Default Settings

14 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

About the Switch 4200G

Summary of

Hardware Features

The Switch 4200G Family are mixed media devices which consist of:

■ 12, 24 or 48 10/100/1000BASE-T ports

■ Four 1000BASE-X SFP ports

■ One option module slot for a 10 Gigabit Ethernet port module on the

Switch 4200G 12-Port. Requires an optional XFP.

■ Two option module slots for a 10 Gigabit Ethernet port module on the

Switch 4200G 24-Port and the Switch 4200G 48-Port. Requires an optional XFP.

■ One RJ-45 connector for serial management

The Switch 4200G Family provides high-performance workgroups with a backbone to server connection. You can also add the Switch 4200G

Family to any SuperStack

system as your network grows.

For information about using the software features of the Switch, refer to the “Command Reference Guide” and the “Configuration Guide” on the CD-ROM that accompanies the Switch.

Table 3 summarizes the hardware features that are supported by the Switch 4200G.

Tab le 3 Hardware Features

Feature Switch 4200G

Addresses Up to 8,000 supported

Auto-negotiation Supported on all ports

Forwarding Modes Store and Forward

Duplex Modes Half and full duplex on all front panel ports

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

Flow Control In full duplex operation all ports are supported

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

Ethernet, Fast Ethernet, and Gigabit Ethernet Ports

SFP Ethernet Ports Supports fiber Gigabit Ethernet long-wave (LX),

Auto MDIX is not supported.

Eight traffic queues per port

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

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

Switch 4200G—Front View Detail

Switch 4200G—Front View Detail 15

Tab le 3 Hardware Features (continued)

Feature Switch 4200G

Mounting 19-inch rack or standalone mounting

Clustering Up to 16 units can be linked together (15 members and

1 commander)

Figure 1 Switch 4200G 12-Port—front view

Unit Status

Display

Port Status LEDs

10/100/1000BASE-T

10/100/1000BASE-T Ports

Figure 2 Switch 4200G 24-Port—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

10/100/1000BASE-T

10/100/1000BASE-T Ports

SFP Status

LEDs

Gigabit SFP Ports

SFP Status

LEDs

27/25

Gigabit SFP Ports

Console

Port

Console

Port

28/26

Mode Gr een=Speed Ye llow=Duplex

Mode

Switch

Unit Status

Display

Mode

Switch

Mode Gr een=Speed Ye llow=Duplex

PWR

MOD 1

MOD 2

Mode LED

PWR

MOD 1

MOD 2

Mode LED

Power LED

10Gbps

Interface Slot

LEDs

Power LED

10Gbps

Interface Slot

LEDs

16 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

Figure 3 Switch 4200G 48-Port—front view

Port Status LEDs

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

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

Console Port

Unit Status

Display

Mode

Switch

Mode Green=Speed Yellow=Duplex

51/49

Mode

LED

Power

LED

52/50

PWR

MOD1

10/100/1000BASE-T

Ports

10/100/1000BASE-T Ports

Gigabit SFP

Ports

10Gbps

Interface Slot

LEDs

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.

The Switch 4200G has 12, 24 or 48 auto-negotiating 10BASE-T/100BASE-TX ports configured as Auto MDIX (crossover). When auto-negotiation is enabled these ports automatically operate in MDI or MDIX mode as needed. 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 effectively doubles the potential throughput of a link.

These ports require either straight-through or cross-over Category 5 cables with RJ-45 connectors at each end. The maximum UTP cable length is 100 m (328 ft) over Category 5 cable.

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

Switch 4200G—Front View Detail 17

1000BASE-X SFP Ports SFP (Small Form Factor Pluggable) ports support fiber Gigabit Ethernet

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 or to create a high capacity aggregated link backbone connection.

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.

Unit Status Display The Status Display is a seven segment display visible on the front of the

Switch. The Status Display indicates switch status conditions such as the unit number, POST test ID, and software upgrade information. In the unlikely event of a hardware fault occurring, the Status Display may be used to help diagnose the problem. For information on using the Status Display for problem solving, see “Solving Problems Indicated by LEDs” on page 54.

Tab le 4 Status Display

Display Mode LED Color Description

Digit (1–9) Mode LED flashing green POST (power-on startup tests) running.

Digit (0–8) Mode LED flashing red POST failure. Digit indicates ID of failed test.

0 POST test OK

1 CPU error

2 Switch chip error

3 RAM error

4 Flash error

5 Port error

6 PHY error

7 Packet memory error

8 CPLD error

18 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

Tab le 4 Status Display (continued)

Display Mode LED Color Description

Rotating bar segment Mode LED flashing green Software download in progress.

Flashing “F” Mode LED steady red Fan failure detected.

Flashing “t” Mode LED flashing red Switch is too hot; temperature is critical.

“C” Mode LED green or yellow Switch is clustered Commander unit.

“c” Mode LED green or yellow Switch is clustered Candidate unit.

“S” Mode LED green or yellow Switch is clustered Slave unit.

“1” Mode LED green or yellow Switch is un-clustered.

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 54.

Tab le 5 LED Behavior

LED Color Indicates

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

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

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

10/100/1000BASE-T Port LEDs

Speed Green A high speed (1000 Mbps) link is present, blinking off for

Yellow A low speed link is present, blinking off for every packet

Yellow Flashing The port has failed POST.

Off No link is present.

Activity, or Stack Status and Activity.

Activity, or Stack Activity.

every packet received or transmitted.

received or transmitted.

Switch 4200G — Rear View Detail 19

Tab le 5 LED Behavior (continued)

LED Color Indicates

Duplex 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.

1000BASE-X Port SFP Port LEDs

Speed Green A high speed (1000 Mbps) link is present.

Yellow Flashing Port failed POST.

Off No link is present.

Duplex 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 4200G — Rear View Detail

AC Power Input

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

10 Gbps Interface

Slots

Figure 4 Switch 4200G—rear view

MOD 1

10Gbps Interface

Slot 1

MOD 2

10Gbps Interface

Slot 2

in the range 100–240 VAC.

The MOD 1 and MOD 2 interface slots accept the 10 Gbps SFP modules.

20 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

Default Settings Table 6 shows the default settings for the Switch 4200G Family.

Tab le 6 Default Settings

Feature Switch 4200G

Automatic IP Configuration Enabled

Port Status Enabled

Port Speed Auto-negotiated

Duplex Mode Auto-negotiated

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 Fixed as VLAN 1 on 4200G units. Can be any

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

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

Port Security Disabled per port

Configuration Save and Restore

VLAN for 4200G units.

Disabled per port

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

Disabled

2 INSTALLING THE SWITCH

This chapter contains the information you need to install and set up the Switch 4200G. It covers the following topics:

■ Package Contents

■ Choosing a Suitable Site

■ Rack-mounting

■ Placing Units On Top of Each Other

■ The Power-up Sequence

■ SFP Operation

■ Choosing the Correct Cables

WARNING: Safety Information. Before installing or removing any components from the Switch 4200G 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 4200G 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 4200G entfernen oder dem Switch 4200G 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 4200G o de realizar tareas de mantenimiento, debe leer la información de seguridad facilitada en el Apéndice A de esta guía del usuario.

22 CHAPTER 2: INSTALLING THE SWITCH

AVVERTENZA: Informazioni di sicurezza. Prima di installare o rimuovere qualsiasi componente dal Switch 4200G 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

■ Power Cord

Choosing a Suitable Site

■ Console Cable (RJ-45)

■ 2 x Mounting brackets

■ 4 x Screws

■ 4 x Rubber feet

The Switch is suited for use either free standing on a desktop, or mounted in a standard 19-inch equipment rack (for example, 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.

Rack-mounting 23

■ 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 four 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.

Rack-mounting The Switch 4200G is 1 rack unit (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:

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 5.

You can also rack mount your Switch using the mounting holes at the rear of the Switch.

24 CHAPTER 2: INSTALLING THE SWITCH

Figure 5 Fitting a 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 step 2 and step 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.

7 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.

Placing Units On Top of Each Other 25

Placing Units On Top of Each Other

The Power-up Sequence

Powering-up the

Switch 4200G

If the Switch units are free-standing, up to four units can be placed one on top of the other. If you are mixing a variety of 3Com equipment, the smaller units must be positioned at the top.

If you are placing Switch units one on top of the other, you must use the self-adhesive rubber feet supplied. Apply the feet to the underside of each Switch, sticking one in the marked area at each corner. Place the Switch units on top of each other, ensuring that the feet of the upper unit sit fully on the lower unit.

The following sections describe how to get your Switch 4200G powered-up and ready for operation.

Use the following sequence of steps to power-up the Switch.

1 Plug the power cord into the power socket at the rear of the Switch.

2 Plug the other end of the power cord into your power outlet.

The Switch powers-up and runs through its Power On Self Test (POST), which takes approximately one minute.

Checking for Correct

Operation of LEDs

During the Power On Self Test, all ports on the Switch are disabled and the LEDs light. The PWR LED will flash green during the POST.

When the POST has completed, check the PWR LED to make sure that your Switch is operating correctly. Table 7 shows possible colors for the LED.

Tab le 7 PWR LED Colors

Color State

Green The Switch is powered-up and operating normally.

Red The Switch has failed its Power On Self Test (POST).

Yellow flashing Some ports have failed POST

Off The Switch is not receiving power.

* In this event you can still use the Switch using the remaining ports that have passed the

POST.

26 CHAPTER 2: INSTALLING THE SWITCH

If there is evidence of a problem, see “Solving Problems Indicated by LEDs” on page 54 for a list of suggested solutions.

CAUTION: The Switch has no ON/OFF switch; the only method of connecting or disconnecting mains power is by connecting or disconnecting the power cord.

SFP Operation The following section describes how to insert an SFP transceiver into an

SFP port.

SFP transceivers are hot-insertable and hot-swappable. You can remove them from and insert them into any SFP port without having to power down the Switch.

Approved SFP

Transceivers

Inserting an SFP

Transceiver

The following list of approved Gigabit Ethernet SFP transceivers is correct at the time of publication.

■ 3CSFP92 SFP (1000BASE-LX)

■ 3CSFP97 SFP (1000BASE-LH70)

■ 3CSFP93 SFP (1000BASE-T)

To access the latest list of approved SFP transceivers for the Switch on the 3Com Corporation World Wide Web site, enter this URL into your internet browser:

http://www.3com.com

To be recognized as valid, the SFP transceiver must have the following characteristics:

■ 1000BASE-LX SFP transceiver

Use this transceiver to connect Gigabit Ethernet SFP ports on the Switch directly to a single-mode fiber-optic cable or to multimode fiber using a conditioned launch cable.

■ 1000BASE-LH70 SFP transceiver

Use this transceiver to connect Gigabit Ethernet SFP ports on the Switch directly to a single-mode fiber-optic cable.

SFP Operation 27

■ 1000BASE-T SFP transceiver

This transceiver uses Category 5 copper cabling with RJ-45 connectors

and supports segment lengths of up to 100 m (328 ft).

If the SFP transceiver is faulty, it will not operate within the Switch. See “Solving Hardware Problems” on page 55.

3Com recommends that you only use SFPs supplied by 3Com. If the SFP transceiver is invalid it will not be recognized by the Switch.

Use the following sequence of steps to activate the SFP ports:

1 The SFP transceiver is keyed and there is only one way in which it can be

installed correctly. It is not necessary to power-down your Switch.

2 Hold the transceiver so that the connector is toward you and the product

label is visible. Ensure the wire release lever is closed (in the upright position).

3 Gently slide the transceiver into the SFP port until it clicks. If the

transceiver does not click into place, remove it, turn it over and re-insert.

4 Remove the plastic protective cover if fitted.

Figure 6 Inserting an SFP Transceiver

Product label

Suitable port on host Switch

5 Use and appropriate cable to connect the transceiver to a suitable device.

6 Check the LEDs on the front of the Switch to ensure that it is operating

correctly. Refer to “LEDs” on page 18 for more information.

28 CHAPTER 2: INSTALLING THE SWITCH

Removing an SFP

Transceiver

Choosing the Correct Cables

If you wish to remove the transceiver (it is not necessary to power-down your Switch):

1 Disconnect the cable from the transceiver.

2 Move the wire release lever downwards until it is pointing toward you.

3 Pull the wire release lever toward you to release the catch mechanism;

the transceiver will then easily slide out.

All of the ports on the Switch are Auto-MDIX, that is they have a cross-over capability. These ports can automatically detect whether to operate in MDI or MDIX mode. Therefore you can make a connection to one of the ports with a straight-through (MDI) or a cross-over cable (MDIX).

The Auto-MDIX feature only operates when auto-negotiation is enabled.

If auto-negotiation is disabled, all the Switch ports are configured as MDIX (cross-over). If you want to make a connection to another MDIX port, you need a cross-over cable. Many ports on workstations and servers are configured as MDI (straight-through). If you want to make a connection to an MDI port, you need to use a standard straight-through cable. See Table 8.

3Com recommends that you use at least Category 5 twisted pair cable—the maximum segment length for this type of cable is 100 m (328 ft.).

Tab le 8 Cables required to connect the Switch to other devices if auto-negotiation is disabled

Cross-over Cable Straight-through Cable

Switch to Switch (MDIX to MDIX)

Switch to Hub (MDIX to MDIX)

Switch to PC (NIC) (MDIX to MDI)

✓ ✕

✕ ✓

Choosing the Correct Cables 29

CAUTION: If you want to install the Switch using a Category 5E or Category 6 cable, 3Com recommends that you briefly connect the cable to a grounded port before connecting network equipment. If you do not, the cable’s Electrostatic Discharge (ESD) may damage the Switch's port.

You can create a grounded port by connecting all wires at one end of a UTP cable to an earth ground point, and the other end to a female RJ-45 connector located, for example, on a Switch rack or patch panel. The RJ-45 connector is now a grounded port.

3Com recommends that you use Category 5 twisted pair cable—the maximum segment length for this type of cable is 100 m (328 ft).

Choosing the Correct

Cables for the

Switch 4200G

All of the ports on the front of the Switch 4200G 28-Port are 100BASE-FX MT-RJ multi-mode ports. The MT-RJ port is a small form factor fiber-optic port with the transmit and receive fibers in the same cable. Unlike many fiber-optic systems, only one MT-RJ cable is needed to connect two MT-RJ ports together.

To connect a front panel port to another 100BASE-FX MT-RJ multi-mode port, or to a patch panel, a single MT-RJ multi-mode pinless jumper cable is required. Since standard MT-RJ cables are cross-over cables, no Auto-MDIX sensing is required. The maximum cable length is 2 kilometers (1.24 miles).

CAUTION: Do not connect pinned MT-RJ connectors into any port on the Switch 4200G as this may damage the unit. The ports have locator pins fitted and are designed for standard (pinless) connectors.

To connect a front panel port to a 100BASE-FX single mode port, or to a port that does not have an MT-RJ connector, an adaptor will be required. It is not possible to connect a front panel port to a 1000BASE-FX port.

30 CHAPTER 2: INSTALLING THE SWITCH

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