3Com 3848, 3812, 3824 User Manual

SuperStack®3 Switch 3812, Switch 3824, and
Switch 3848

Getting Started Guide

3C17401
3C17400
3CR17402-91

http://www.3com.com/

Part No. DUA1740-0AAA03 Rev. 01
Published September 2004

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

Copyright © 2004, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced
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If you are a United States government agency, then this documentation and the software described herein are
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All technical data and computer software are commercial in nature and developed solely at private expense.
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CONTENTS

ABOUT THIS GUIDE

Conventions 8
Related Documentation 9
Accessing Online Documentation 9
Documentation Comments 10

1 INTRODUCING THE SUPERSTACK 3 SWITCH 3812,

S

WITCH 3824, AND SWITCH 3848

About the Switch 12

Summary of Hardware Features 12

Switch — Front View Detail 13

10BASE-T/
100BASE-TX/
1000BASE-T Ports 14

Dual Personality SFP Ports 14
Console Port 14
LEDs 15

Switch — Rear View Detail 16

Power Socket 17
Redundant Power System Socket (Switch 3848 only) 17

Default Settings 17

2 INSTALLING THE SWITCH

Package Contents 20
Choosing a Suitable Site 20
Rack-mounting 21
Placing Units On Top of Each Other 22
The Power-up Sequence 23

Powering-up the Switch 23
Checking for Correct Operation of LEDs 23

Connecting a Redundant Power Supply (Switch 3848 only) 23
Choosing the Correct Cables 24

SFP Operation 25

Approved SFP Transceivers 25
Inserting an SFP Transceiver 25
Removing an SFP Transceiver 27

3 SETTING UP FOR MANAGEMENT

Setting Up Overview 30

IP Configuration 31
Preparing for Management 32

Manually Configuring IP Information 32

Connecting to the Console Port 32

Viewing Automatically Configured IP Information 36

Using 3Com Network Supervisor 36
Connecting to the Console Port 36

Methods of Managing a Switch 39

Command Line Interface Management 39
Web Interface Management 40
SNMP Management 40

Setting Up Command Line Interface Management 40

CLI Management via the Console Port 41
CLI Management over the Network 41

Setting Up Web Interface Management 42

Pre-requisites 42
Web Management Over the Network 43

Setting Up SNMP Management 43

Pre-requisites 43

Default Users and Passwords 44

Changing Default Passwords 44

4 PROBLEM SOLVING

Solving Problems Indicated by LEDs 46
Solving Hardware Problems 47
Solving Communication Problems 49
Solving Software Upgrade Problems 50

A SAFETY INFORMATION

Important Safety Information 52
L’information de Sécurité Importante 54
Wichtige Sicherheitsinformationen 56
Power Cord Set — Japan 57

B PIN-OUTS

Null Modem Cable 59
PC-AT Serial Cable 60
Modem Cable 61
RJ-45 Pin Assignments 61

C TECHNICAL SPECIFICATIONS

Switch 3812, Switch 3824, and Switch 3848 63

D OBTAINING SUPPORT FOR YOUR PRODUCT

Register Your Product to Gain Service Benefits 65
Purchase Value-Added Services 65
Troubleshoot Online 65
Access Software Downloads 66
Contact Us 66
Telephone Technical Support and Repair 66

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

This guide provides all the information you need to install and use 3Com®

®

SuperStack

3 Switch 3812 (3C17401), Switch 3824 (3C17400), or

Switch 3848 (3CR17402-91) in its default state.

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).

Please refer to the CD-ROM that accompanies your Switch for the
following:

■ Management Interface Reference Guide — an online guide which

gives you detailed information on how to use the web interface and
command line interface to manage the Switch.

■ Other documentation relating to the 3Com SuperStack 3

Switch 3812, Switch 3824, or Switch 3848.

■ 3Com Network Supervisor — a powerful network management tool

for small to medium enterprise networks.

■ A number of other useful applications.

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.

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/

8 ABOUT THIS GUIDE

Conventions Ta bl e 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

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.

Related Documentation 9

Related Documentation

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

■ Management Quick Reference Guide

This guide contains:

■ a list of software features supported by each Switch.

■ a summary of the web interface and command line interface

commands for the Switch.

■ Release Notes

These notes provide information about the current software release,
including new features, modifications, and known problems.

■ 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.

■ 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.

Accessing Online Documentation

There are other publications you may find useful:

■ Documentation accompanying the SFP Transceivers.

■ Documentation accompanying 3Com Network Supervisor. This is

supplied on the CD-ROM that accompanies the Switch.

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

■ Switch Implementation Guide (PDF format).

■ Switch Management Interface Reference Guide (HTML format).

■ Other documentation relating to the Switch 3812, Switch 3824, or

Switch 3848 (PDF format).

10 ABOUT THIS GUIDE

To access the online documentation from the CD-ROM:

1 Insert the CD-ROM into the relevant 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/referenceguide

on the CD-ROM. The documentation is accessed using the index.htm
file.

■ The PDF Implementation Guide is stored in the

Docs/implementation directory of the CD-ROM.

3Com recommends that you copy the Docs/referenceguide
directory as a whole to maintain the structure of the files.

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:

[e-mail]

Please include the following information when commenting: Document
title, Document part number (on the title page) and Page number (if
appropriate).

Example:

Part Number DUA1740-0AAA03
SuperStack 3 Switch 3812, Switch 3824, and Switch 3848 Getting
Started Guide
Page 10

1

INTRODUCING THE SUPERSTACK 3
S

WITCH 3812, SWITCH 3824, AND
WITCH 3848

S

This chapter contains introductory information about the Switch 3812,
Switch 3824, and Switch 3848 and how they can be used in your
network. It covers summary information about the hardware and the
following topics:

■ About the Switch

■ Switch — Front View Detail

■ Switch — Rear View Detail

■ Default Settings

12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848

About the Switch The Switch 3812, Switch 3824 and Switch 3848 units are

10/100/1000 Mbps Ethernet Switches which consist of either:

■ 12 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports (Switch 3812) or

■ 24 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports (Switch 3824) or

■ 48 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports (Switch 3848)

and:

■ Four SFP ports

The highest four numbered RJ-45 ports are combination ports. When an
SFP module is inserted it has priority over the 10/100/1000 port of the
same number (9–12 on the Switch 3812, 21–24 on the Switch 3824, and
45-48 on the Switch 3848).

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

Summary of

Hardware Features

Ta bl e 3

summarizes the hardware features that are supported by the

Switch 3812, Switch 3824, and Switch 3848.

Tab le 3 Hardware features

Feature Switch 3812, Switch 3824, and Switch 3848

MAC Addresses Up to 16,000 supported

Forwarding Modes Store and Forward

Auto-negotiation Supported on all ports

Auto MDI/MDIX Supported on all 10/100/1000 ports

Duplex Modes Half and full duplex on all 10/100/1000 ports when

SFP Gigabit Ethernet
Ports

Flow Control Supported on all ports

Traffic Prioritization Supported (IEEE Std 802.1D, 1998 Edition)

Fast Ethernet and
Gigabit Ethernet Ports

running at 10 Mbps or 100 Mbps.

Supports fiber Gigabit Ethernet short-wave (SX),
long-wave (LX) and long-haul (LH70) transceivers in any
combination

Eight traffic queues per port

Auto-negotiating 10BASE-T/100BASE-TX/1000BASE-T
and SFP ports

Switch — Front
View Detail

Switch — Front View Detail 13

Feature Switch 3812, Switch 3824, and Switch 3848

RPS Support Connects to SuperStack 3 Advanced Redundant Power

System (ARPS). (Switch 3848 only)

Mounting 19-inch rack or stand-alone mounting

Figure 1 Switch 3812 — front view

Figure 2 Switch 3824 — front view

14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848

Figure 3 Switch 3848 — front view

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/

1000BASE-T Ports

Dual Personality SFP

Ports

The 10BASE-T/100BASE-TX/1000BASE-T ports have RJ-45 connectors and
are configured as Auto MDIX (cross-over).

The default state for these ports is auto-negotiation enabled, where the
speed, duplex and flow control modes of a link are automatically
detected to provide the highest available bandwidth with the link partner.

Alternatively, auto-negotiation can be disabled. These ports can be
manually configured to 10 Mbps half duplex, 100 Mbps half duplex,
10 Mbps full duplex or 100 Mbps full duplex. It is not possible to
manually configure a 1000 Mbps link as auto-negotiation is mandatory in
the 1000 Mbps standard. If auto-negotiation is disabled, Auto MDIX
cannot function and the ports are fixed as MDIX (cross-over) mode.

If auto-negotiation is disabled on a 1000 Mbps port, the speed will drop
to the highest available speed. By default this is 100 Mbps.

The four Dual Personality SFP (Small Form Factor Pluggable) ports support
fiber Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul
(LH70) transceivers in any combination. This offers you the flexibility of

Switch — Front View Detail 15

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 SFP ports are capable of auto-negotiating flow control. 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 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. The Switch 3812 and Switch 3824 have
a DB-9 serial connector and need a serial cable to connect to your PC.
The Switch 3848 has an RJ-45 serial port and is supplied with an RJ-45 to
DB-9 cable.

The standard null modem cable is set to autobaud (up to a maximum of
19,200 baud), 8 data bits, no parity and 1 stop bit.

LEDs Ta bl e 4

status according to color. For information on using the LEDs for problem
solving, see “

Tab le 4 LED behavior

LED Color Indicates

Port Status/Packet LEDs

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

Checking for Correct Operation of LEDs” on page 23.

Green A high speed (1000 Mbps) link is present, and the port

is enabled.

Green flashing A high speed (1000 Mbps) link is present and active.

Yellow A low speed (10/100 Mbps) link is present, and the

port is enabled.

Yellow flashing A low speed (10/100 Mbps) link is present and active.

Green for one
second, Amber
for one second,
then OFF until
operational.

Alternate yellow
then green
flashing (fast)

Alternate yellow
then green
flashing

POST in operation, all LEDs perform a one second lamp
test.

A port has failed a loop back test during POST.

A link is present but the port has been disabled.

16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848

LED Color Indicates

Off No link is present.

Power LED (Switch 3812 and Switch 3824)

Green The Switch is powered-up and operating normally.

Red The Switch has a fault with the Power Supply Unit.

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

with the Power Supply Unit.

Self Test LED (Switch 3812 and Switch 3824)

Green flashing There is a test in progress.

Green All tests have been passed and the Switch is ready for

Red A fault has occurred.

Red flashing An internal fan has failed.

Off The unit is booting-up.

Power/Self Test LED (Switch 3848 only)

Green The Switch is powered-up and operating normally.

Green flashing The Switch is either downloading software or is

Yellow The Switch is faulty.

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

Fault LED (Switch 3848 only)

Red The Switch and/or the PSU are above critical

Off The Switch and PSU are below critical temperature.

use.

initializing (which includes running a Power On Self
Test).

with the Power Supply unit.

temperature but below critical shut down temperature.
Fans are operating normally.

One or more fans have failed.

Switch — Rear View
Detail

Figure 4 Switch 3812 and Switch 3824 — rear view

Power Socket

Default Settings 17

Figure 5 Switch 3848 — rear view

Redundant Power System Socket

Power Socket Each Power Supply automatically adjusts its power setting to any power

voltage in the range 100-240 VAC.

Redundant Power

System Socket

(Switch 3848 only)

To protect against internal power supply failure, you can use this socket
to connect the Switch to a SuperStack 3 Advanced Redundant Power
System. See “
on page 23

Connecting a Redundant Power Supply (Switch 3848 only)”

.

Default Settings Ta bl e 5 shows the default settings for the Switch 3812, Switch 3824 and

Switch 3848. If you initialize one of the Switch units, it is returned to
these defaults.

Tab le 5 Default Settings

Feature Switch 3812, Switch 3824, or Switch 3848

Port Status Enabled

Port Speed Auto-negotiated

Duplex Mode Auto-negotiated

Flow Control Disabled

Broadcast Storm Control Enabled

Threshold: 3000 broadcast frames per second

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

(VLAN 1)

Multicast Filtering IGMP filtering enabled

Rapid Spanning Tree Protocol Enabled

Link Aggregation Control
Protocol (LACP)

Spanning Tree Protocol Enabled

Smart Auto-sensing Enabled

Disabled per port

18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3812, SWITCH 3824, AND SWITCH 3848

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 Gateway

2

INSTALLING THE SWITCH

This chapter contains the information you need to install and set up the
Switch 3812, Switch 3824, or Switch 3848. 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

WARNING: Safety Information. Before installing or removing any
components from the Switch 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 de Switch 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 Schalter entfernen oder den Schalter hinzufügen oder
Instandhaltungsarbeiten verrichten, lesen Sie die
Sicherheitsanweisungen, die in Anhang A in diesem Handbuch
aufgeführt sind.

20 CHAPTER 2: INSTALLING THE SWITCH

Package Contents ■ Switch unit

■ CD-ROM

■ This Guide

■ Management Quick Reference Guide

■ Release Notes

■ Warranty Flyer

■ Power Cord

■ 2 x securing brackets

■ 4 x screws (Switch 3812 and Switch 3824)

■ 8 x screws (Switch 3848)

■ 4 x rubber feet

■ RJ45 to DB9 converter cable (Switch 3848 only)

Choosing a Suitable Site

The Switch is suited for use in an internal wiring closet, a network room,
or telecommunications room, where it can be mounted in a standard
19-inch equipment rack, or free-standing.

CAUTION: Ensure that the ventilation holes are not obstructed.

The Switch 3848 is fitted with high speed fans that have a high audible
output while running at full speed. The Switch is designed to reduce the
fan speed shortly after power on (if thermal conditions allow) which will
also reduce the fan noise generated.

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
25 mm (1 in.) clearance.

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

Rack-mounting 21

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 Switch is situated away from sources of conductive (electrical)

dust, for example laser printers.

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

■ 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.

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

the units are free-standing.

Rack-mounting The Switch 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.

CAUTION: If you use a shelf or support ensure that it will not obstruct
the air flow through the side panels of the Switch.

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 securing bracket over the mounting holes on one side of the

Switch, as shown in Figure 6

.

3 Insert the screws and tighten with a suitable screwdriver.

22 CHAPTER 2: INSTALLING THE SWITCH

Figure 6 Fitting a bracket for rack-mounting

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

Placing Units On Top of Each Other

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.

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 Switch and Hub units,
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 pads supplied. Apply the pads to the underside of
each Switch, sticking one in the marked area at each corner. Place the
Switch units on top of each other.

The Power-up Sequence 23

The Power-up Sequence

Powering-up the

Switch

Checking for Correct

Operation of LEDs

The following sections describe how to get your Switch 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 1 minute.

During the Power On Self Test, all ports on the Switch are disabled and
the LEDs light in a rapid sequence.

When the POST has completed, check the Unit Status to make sure that
your Switch is operating correctly. Ta bl e 6

shows possible colors for the

LED.

Tab le 6 Unit Status Colors

Color State

Green The Switch is powered-up and operating normally.

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

Off The Switch is not receiving power.

Connecting a

Redundant Power

Supply (Switch 3848

only)

If there is evidence of a problem, see “Solving Problems Indicated by

LEDs” on page 46 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.

You can connect a SuperStack 3 Advance Redundant Power System to
the Switch 3848. This unit, which is also known as RPS, is designed to
maintain the power to your Switch if a power supply failure occurs.

For normal redundancy, the unit requires a Type 3 Power Module (part
number 3C16075)

24 CHAPTER 2: INSTALLING THE SWITCH

For full redundancy, the unit requires two Type 3 Power Modules
combined using a Type 3 Y-Cable (part number 3C16077).

WARNING: If you are connecting the Switch to a Type 3 Power Module,
read the Safety Information section in the Type 3 Power Module User
Guide.

CAUTION: The Switch can only use a SuperStack Advance Redundant
Power System output.

Choosing the Correct

Cables

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 Ta bl e 7

.

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 7 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)

✓ ✕

✓ ✕

✕ ✓

SFP Operation 25

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.

SFP Operation The following sections 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 SFP transceivers is correct at the time of
publication.

■ 3CSFP91 SFP (SX)

■ 3CSFP92 SFP (LX)

■ 3CSFP97 SFP (LH70)

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-SX, 1000BASE-LX or 1000BASE-LH70:

■ 1000BASE-SX SFP transceiver

Use this transceiver to connect the Switch directly to a multimode
fiber-optic cable.

■ 1000BASE-LX SFP transceiver

26 CHAPTER 2: INSTALLING THE SWITCH

■ 1000BASE-LH70 SFP transceiver

If the SFP transceiver is faulty, it will not operate within the Switch. See

“Solving Hardware Problems”

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).

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

Use this transceiver to connect the Switch directly to a single-mode
fiber-optic cable.

on page 47.

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.

CAUTION: The dual personality ports on the Switch enable you to
activate an RJ-45 port or an SFP port or a mixture of both. Taking the
Switch 3848 as an example, you can activate the RJ-45 ports 45 and 46
and the SFP ports 47 and 48 at the same time. If you try to activate the
same dual personality RJ-45 port and SFP port (for example, RJ-45 port 45
and SFP port 45 at the same time), the SFP port will take priority.

SFP Operation 27

Figure 7 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 15 for more information.

Removing an SFP

Transceiver

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.

28 CHAPTER 2: INSTALLING THE SWITCH

3

SETTING UP FOR MANAGEMENT

Your Switch can operate in its default state, that is, you can install it and
it will work straight away (plug-and-play). However, to make full use of
the features offered by the Switch, and to change and monitor the way it
works, you have to access the management software that resides on the
Switch. This is known as managing the Switch.

Managing the Switch can help you to improve the efficiency of the
Switch and therefore the overall performance of your network.

This chapter explains the initial set up of the Switch and the different
methods of accessing the management software to manage a Switch. It
covers the following topics:

■ Setting Up Overview

■ Manually Configuring IP Information

■ Viewing Automatically Configured IP Information

■ Methods of Managing a Switch

■ Setting Up Command Line Interface Management

■ Setting Up Web Interface Management

■ Setting Up SNMP Management

■ Default Users and Passwords

30 CHAPTER 3: SETTING UP FOR MANAGEMENT

Setting Up Overview

This section gives an overview of what you need to do to get your Switch
set up and ready for management when it is in its default state. The
whole setup process is summarized in Figure 8

. Detailed procedural steps

are contained in the sections that follow. In brief, you need to:

■ Configure IP information manually for your Switch or view the

automatically configured IP information

■ Prepare for your chosen method of management

Figure 8 Initial Switch Setup and Management Flow diagram

Power Up the Switch.

Plug and Play Setup

How do you want to connect to the Switch?

Connect to a front

panel port and use the

Web Interface or

Initial IP Information Se tup

Command Line Interface.

See page 32

Yes

Connect to the console

port and use the

Command Line

IP Information is automatic ally configured.

Interface.

See page 32

See page 31

Do you want to manually

configure the IP information?

Use 3Com Network

No

How do you want to view the aut omatically

configured IP information?

Supervisor (3NS).

See page 36

Connect to the console

port and use the

Command Line

Interface.

See page 36

Feature Management

Connect via the

console port.

Command Line Interface

See

page 41

How do you want to manage your Switch? See page 39

SNMP

See page 43

Connect over the

network via Telnet.

See page 41

Web Interface

Connect over the

network.

See

page 43

Setting Up Overview 31

CAUTION: To protect your Switch from unauthorized access, you must
change all three default passwords as soon as possible, even if you do not
intend to actively manage your Switch. For more information on default
users and changing default passwords, see “Default Users and

Passwords” on page 44.

IP Configuration You can use one of the following methods to allocate IP information to

your Switch (essential if you wish to manage your Switch across the
network).

Manual IP Configuration

You can choose to configure the IP information yourself. The Switch
remembers the information that you enter until you change it again or
set the configuration method to Automatic.

You should use the Manual IP configuration method if:

■ you do not have a DHCP server on your network, or

■ you want to remove the risk of the IP address ever changing, or

■ your DHCP server does not allow you to allocate static IP addresses.

(Static IP addresses are necessary to ensure that the Switch is always
allocated the same IP information.)

For most installations, 3Com recommends that you configure the Switch
IP information manually. This makes management simpler and more
reliable as it is not dependent on a DHCP server, and eliminates the risk of
the IP address changing.

If you wish to manually enter IP information for your Switch, work
through the “Manually Configuring IP Information”

section on page 32.

Automatic IP Configuration

By default the Switch tries to configure itself with IP information without
requesting user intervention. It tries to obtain an IP address from a DHCP
server on the network.

It may take up to 5 minutes for your Switch to obtain an IP address after
it has been powered up.

When using automatic IP configuration it is important that the IP address
of the Switch is static, otherwise you will not know what the IP address is
and it will be difficult to manage. Most DHCP servers allow static IP

32 CHAPTER 3: SETTING UP FOR MANAGEMENT

addresses to be configured so that you know what IP address will be
allocated to the Switch. Refer to the documentation that accompanies
your DHCP server.

For a detailed description of how automatic IP configuration operates,
please refer to the Implementation Guide on the CD-ROM that
accompanies your Switch or on the 3Com Web site.

You should use the automatic IP configuration method if:

■ your network uses DHCP to allocate IP information, or

■ flexibility is needed. If the Switch is re-deployed onto a different

subnet, it will automatically reconfigure itself with an appropriate IP
address, instead of you having to manually reconfigure the Switch.

If you use the automatic IP configuration method, you need to discover
the automatically allocated IP information before you can begin
management. Work through the “Viewing Automatically Configured IP

Information” section on page 36.

Preparing for

Management

Manually Configuring IP Information

Connecting to the

Console Port

Once your Switch’s initial set up is complete you can set up your chosen
management method as described in “Methods of Managing a Switch”
on page 39

.

For detailed information about the specific web interface operations and
command line interface commands and problem solving, refer to the
“Management Interface Reference Guide” on the CD-ROM that is
supplied with the Switch or on the 3Com Web site.

You can manually configure the Switch IP information in the following
way:

■ Connecting to the console port — connect a workstation using a

console cable to the console port of the Switch. You can then
manually enter IP information using the command line interface (CLI).

To set up your Switch manually you can alternatively make a connection
to the console port (this example describes a local connection to the
console port, rather than a remote one via a modem). You can do this
whilst the Switch is offline, that is, before you connect the Switch to a
network, or whilst the Switch is online, that is, connected to a network.

Manually Configuring IP Information 33

Pre-requisites

■ A workstation with terminal emulation software installed, such as

Microsoft Hyperterminal. This software allows you to communicate
with the Switch via the console port directly, or through a modem.

■ Documentation supplied with the terminal emulation software.

■ A suitable cable:

■ An RJ-45 to DB9 converter cable (Switch 3848 only).

■ A standard null modem cable — if you are connecting directly to

the console port, or

■ A standard modem cable — if you are connecting to the console

port using a modem.

You can find pin-out diagrams for the cables in Appendix B

■ You need to have the following so that you can manually set up the

on page 59.

Switch with IP information:

■ IP address

■ subnet mask

■ default gateway

Connecting the Workstation to the Switch

1 Connect the workstation to the console port using a standard null

modem cable (Switch 3812 and Switch 3824) or an RJ-45 to DB9
converter cable and a standard null modem cable (Switch 3848) as
shown in Figure 9

Figure 9 Connecting a workstation to the Switch via the console port

Workstation

(with terminal emulation

software installed)

(Switch 3848 shown).

Standard Null Modem Cable

Switch

RJ-45 to DB9 Converter Cable

Console Port

Connection

34 CHAPTER 3: SETTING UP FOR MANAGEMENT

To connect the cable:

a Switch 3812 and Switch 3824: Insert one end of the null modem

cable into the console port of the Switch.
Switch 3848: Insert the RJ-45 end of the RJ-45 to DB9 converter cable
into the console port of the Switch.

b Switch 3848 only: Connect the null modem cable to the DB9 end of

the converter cable.

c All Switches: Connect the other end of the null modem cable to one

of the serial ports (also known as a COM port) on your workstation.

2 Open your terminal emulation software and configure the COM port

settings to which you have connected the cable. The settings should be
set to match the default settings for the Switch, which are:

■ 19,200 baud

■ 8 data bits

■ no parity

■ 1 stop bit

■ no hardware flow control

Refer to the documentation that accompanies the terminal emulation
software for more information.

Setting Up the Switch with IP Information

You are now ready to manually set up the Switch with IP information
using the command line interface.

1 The command line interface login sequence begins as soon as the Switch

detects a connection to its console port.

If the login prompt does not begin immediately, press Return a few times
until it starts.

2 At the login and password prompts, enter admin as your user name and

press Return at the password prompt. If you have logged on correctly, the
top-level menu of the command line interface is displayed as shown in
the example in Figure 10

.

Manually Configuring IP Information 35

Figure 10 Example top-level command line interface menu

3 At the Select menu option prompt you can either:

■ enter the protocol ip basicConfig command. At the Enter

configuration method prompt enter manual. The screen

prompts you to enter IP information.

or

■ enter the gettingStarted command. At the Enter

configuration method prompt enter manual. The screen

prompts you to enter IP information.

4 Enter the IP address, subnet mask, and gateway IP address for the Switch.

The screen displays a summary of the information entered.

If using the gettingStarted command you will then be prompted to
enter system information, change passwords, and then given the option
to carry out advanced configuration.

The initial set up of your Switch is now complete and the Switch is ready
for you to set up your chosen management method. See “Methods of

Managing a Switch” on page 39.

If you do not intend to use the command line interface via the console
port to manage the Switch, you can logout, disconnect the serial cable
and close the terminal emulator software.

36 CHAPTER 3: SETTING UP FOR MANAGEMENT

Viewing Automatically Configured IP Information

Using 3Com Network

Supervisor

If you allow the Switch to automatically configure its own IP information
you need to discover and view the IP information before you can begin to
manage the Switch. You can discover the IP information in two ways:

■ Using 3Com Network Supervisor — this application will auto-discover

the Switch and display the automatically allocated IP information
assigned to the Switch.

■ Connecting to the Console Port — connect a workstation using a

console cable to the console port of the Switch. You can then view the
IP information automatically assigned to the Switch using the
command line interface (CLI).

You can use the 3Com Network Supervisor application provided on the
CD-ROM that accompanies your Switch to discover the automatically
allocated IP information.

1 Connect your Switch to the network.

2 Power-up the Switch and wait for two minutes.

3 Launch 3Com Network Supervisor and run the Auto-discovery wizard.

3Com Network Supervisor will auto-discover the new Switch and display
the IP information that has been automatically allocated to the Switch.

Most DHCP servers allow static IP addresses to be configured so that you
know what IP address the Switch will be given. Refer to the
documentation that accompanies your DHCP server.

Connecting to the

Console Port

If your network does not have a DHCP server, the workstation running
3Com Network Supervisor must be on the same subnet as the Switch,
because Auto-IP addresses are non-routable.

Alternatively, you can view the automatically configured IP information
via the command line interface (CLI) through a connection to the console
port. (This example describes a local connection to the console port,
rather than a remote one via a modem.)

Pre-requisites

■ A workstation with terminal emulation software installed, such as

Microsoft Hyperterminal. This software allows you to communicate
with the Switch via the console port directly, or through a modem.

■ Documentation supplied with the terminal emulation software.

Viewing Automatically Configured IP Information 37

■ A suitable cable:

■ A standard null modem cable — if you are connecting directly to

the console port, or

■ A standard modem cable — if you are connecting to the console

port using a modem.

■ An RJ-45 to DB9 converter cable. (Switch 3848 only)

You can find pin-out diagrams for the above cables in Appendix B

page 59

■ A Category 5 twisted pair Ethernet cable with RJ-45 connectors to

.

on

connect your Switch to the network.

Connecting the Workstation to the Switch

1 Connect the workstation to the console port using an RJ-45 to DB9

converter cable and a standard null modem cable as shown in Figure 11

Figure 11 Connecting a workstation to the Switch via the console port

Workstation

(with terminal emulation

software installed)

Standard Null Modem Cable

RJ-45 to DB9 Converter Cable

Switch

Console Port

Connection

To connect the cable:

a Insert the RJ-45 end of the RJ-45 to DB9 converter cable into the

console port.

b Connect the null modem cable to the DB9 end of the converter cable.
c Connect the other end of the null modem cable to one of the serial

ports (also known as a COM port) on your workstation.

.

2 Open your terminal emulation software and configure the COM port

settings to which you have connected the cable. The settings should be
set to match the default settings for the Switch, which are:

■ 19,200 baud

■ 8 data bits

■ no parity

■ 1 stop bit

38 CHAPTER 3: SETTING UP FOR MANAGEMENT

■ no hardware flow control

Refer to the documentation that accompanies the terminal emulation
software for more information.

Viewing IP Information via the Console Port

You are now ready to view the automatically allocated IP information
using the command line interface.

1 Connect your Switch to the network using an Ethernet cable. As soon as

a network connection is made the Switch begins the automatic IP
configuration process.

The automatic IP configuration process usually completes within one
minute.

2 The command line interface login sequence begins as soon as the Switch

detects a connection to its console port.

If the login prompt does not begin immediately, press Return a few times
until it starts.

3 At the login and password prompts, enter admin as your user name and

press Return at the password prompt. If you have logged on correctly, the
top-level menu of the command line interface is displayed as shown in
the example in Figure 12

.

Figure 12 Example top-level command line interface menu

4 At the Select menu option prompt enter the protocol ip

interface summary command. A summary of the automatically
allocated IP information is displayed. Make a note of the IP Address.

Methods of Managing a Switch 39

h

The initial set up of your Switch is now complete and the Switch is ready
for you to set up your chosen management method. See “Methods of

Managing a Switch” on page 39.

If you do not intend to use the command line interface via the console
port to manage the Switch, you can disconnect the serial cable and close
the terminal emulator software.

Methods of Managing a Switch

Command Line

Interface

Management

Once you have completed the initial set up of your Switch, you can
decide how you wish to manage the Switch. You can use one of the
following methods:

■ Command line interface management

■ Web interface management

■ SNMP management

Each Switch has a command line interface (CLI) that allows you to
manage the Switch from a workstation, either locally via a console port
connection (see Figure 13

Figure 13 CLI management via the console port

Workstation

(with terminal emulation

software installed)

Standard Null Modem Cable

Figure 14 CLI management over the network

), or remotely over the network (see Figure 14).

Switch

Console Port

Connection

RJ-45 to DB9 Converter Cable

Workstation

Connect over Network

via Telnet

Refer to “Setting Up Command Line Interface Management” on

page 40

.

Switc

40 CHAPTER 3: SETTING UP FOR MANAGEMENT

Web Interface

Management

Each Switch has an internal set of web pages that allow you to manage
the Switch using a Web browser remotely over an IP network (see

Figure 15

Figure 15 Web interface management over the network

).

Workstation

Connect over Network

via web browser

Switch

Refer to “Setting Up Web Interface Management” on page 42.

SNMP Management You can manage a Switch using any network management workstation

running the Simple Network Management Protocol (SNMP) as shown in

Figure 16

. For example, you can use the 3Com Network Supervisor

software that is provided on the CD-ROM that accompanies your Switch.

Figure 16 SNMP management over the network

Setting Up Command Line Interface Management

SNMP Network Management

Workstation

Connect over Network

using SNMP

Switch

Refer to “Setting Up SNMP Management” on page 43.

This section describes how you can set up command line interface
management using a local console port connection or over the network.

Setting Up Command Line Interface Management 41

CLI Management via

the Console Port

CLI Management over

the Network

To manage a Switch using the command line interface via the local
console port connection:

1 Ensure you have connected your workstation to the console port correctly

as described in “Connecting to the Console Port”

on page 32.

2 Your Switch is now ready to continue being managed and/or configured

through the CLI via its console port.

To manage a Switch using the command line interface over a network
using Telnet:

1 Ensure you have already set up the Switch with IP information as

described in “Setting Up Overview”

on page 30.

2 Check that you have the IP protocol correctly installed on your

management workstation. You can check this by trying to browse the
World Wide Web. If you can browse, the IP protocol is installed.

3 Check you can communicate with the Switch by entering a ping

command at the DOS prompt in the following format:

c:\ ping xxx.xxx.xxx.xxx

(where xxx.xxx.xxx.xxx is the IP address of the Switch)

If you get an error message, check that your IP information has been
entered correctly and the Switch is powered up.

4 To open a Telnet session via the DOS prompt, enter the IP address of the

Switch that you wish to manage in the following format:

>telnet xxx.xxx.xxx.xxx

(where xxx.xxx.xxx.xxx is the IP address of the Switch)

If opening a Telnet session via third party software you will need to enter
the IP address in the format suitable for that software.

5 At the login and password prompts, enter admin as your user name and

press Return at the password prompt (or the password of your choice if
you have already modified the default passwords).

If the login prompt does not display immediately, press Return a few
times until it starts.

6 If you have logged on correctly, the top-level menu of the command line

interface for the Switch you wish to manage is displayed as shown in

Figure 10

on page 35.

42 CHAPTER 3: SETTING UP FOR MANAGEMENT

Setting Up Web Interface Management

Pre-requisites

Netscape 4.76

Netscape 6.2

Internet Explorer

5.0, 5.5 and 6.0

This section describes how you can set up web interface management
over the network.

■ Ensure you have already set up the Switch with IP information as

described in “Setting Up Overview”

■ Ensure that the Switch is connected to the network using a Category

on page 30.

5 twisted pair Ethernet cable with RJ-45 connectors.

■ A suitable Web browser.

Choosing a Browser

To display the web interface correctly, use one of the following Web
browser and platform combinations:

Tab le 8 Supported Web Browsers and Platforms

Windows NT 4Windows

Windows 95 Windows 98

2000

Windows XP

✓ ✓ ✓ ✓ ✓ ✓

✕ ✓ ✓ ✓ ✓ ✕

✓ ✓ ✓ ✓ ✓ ✕

Solaris

2.6

For the browser to operate the web interface correctly, JavaScript and
Cascading Style Sheets must be enabled on your browser. These features
are enabled on a browser by default. You will only need to enable them if
you have changed your browser settings.

To enable style sheets in Netscape Navigator 4.76 on Solaris 2.6, open
Netscape Navigator and select Edit > Preferences > Fonts. Select the Use
document-specified fonts, including Dynamic Fonts radio button. You
should also set the font sizes as follows:

■ Variable Width Font - Size 10.0

■ Fixed Width Font - Size 12.0

This ensures that the text spacing is correct. Finally in the Advanced
category ensure that Enable JavaScript and Enable style sheets are
checked.

Setting Up SNMP Management 43

Web Management

Over the Network

To manage a Switch using the web interface over an IP network:

1 Check that you have the IP protocol correctly installed on your

management workstation. You can check this by trying to browse the
World Wide Web. If you can browse, the IP protocol is installed.

2 Check you can communicate with the Switch by entering a ping

command at the DOS prompt in the following format:

c:\ ping xxx.xxx.xxx.xxx

(where xxx.xxx.xxx.xxx is the IP address of the Switch)

If you get an error message, check that your IP information has been
entered correctly and the Switch is powered up.

3 Open your web browser and enter the IP address of the Switch that you

wish to manage in the URL locator, for example, in the following format:

http://xxx.xxx.xxx.xxx

4 At the login and password prompts, enter admin as your user name and

press Return at the password prompt (or the password of your choice if
you have already modified the default passwords).

5 Click on the Device View button to display the web management options.

Setting Up SNMP Management

Pre-requisites

Any network management application running the Simple Network
Management Protocol (SNMP) can manage a Switch if:

■ The correct Management Information Bases (MIBs) are installed on the

management workstation.

■ The management workstation is connected to the Switch using a port

on the management VLAN (VLAN 1 by default). By default, all ports
on the Switch are in VLAN 1.

You can use the 3Com Network Supervisor application that is provided on
the CD-ROM that accompanies your Switch to provide SNMP
management for your Switch. If you use 3Com Network Supervisor it
automatically loads the correct MIBs and necessary files onto your
workstation.

■ Documentation supplied with the SNMP network management

application software.

44 CHAPTER 3: SETTING UP FOR MANAGEMENT

To manage your Switch using an SNMP network management
application, you need to specify SNMP community strings for the users
defined on the Switch. You can do this using the command line interface
system management snmp community command — refer to the
command line interface section of the “Management Interface Reference
Guide” for more information.

Default Users and Passwords

If you intend to manage the Switch using the web interface or the
command line interface, or to change the default passwords, you need to
log in with a valid user name and password. The Switch has three default
user names, and each user name has a different password and level of
access. These default users are listed in Tab le 9

.

CAUTION: To protect your Switch from unauthorized access, you must
change all three default passwords as soon as possible, even if you do not
intend to actively manage your Switch

Tab le 9 Default Users

User
Name

monitor monitor monitor — the user can view all manageable parameters,

manager manager manager — the user can access and change the

admin (no

Default
Password

password)

Access Level

except special/security features, but cannot change any
manageable parameters.

operational parameters but not special/security features

security — the user can access and change all manageable
parameters

Use the admin default user name (no password) to login and carry out
initial Switch setup.

Changing Default

Passwords

You can change the default passwords using either:

■ The gettingStarted command on the CLI, or

■ The security device user modify command on the CLI, or

■ The Security > Device > User > Modify operation on the web interface.

For more information about default users and passwords, refer to the
“Management Interface Reference Guide” on the Switch CD-ROM.

4

PROBLEM SOLVING

This chapter helps you to diagnose and solve problems you may have
with the operation of your Switch. There is also an explanation of IP
addressing.

The topics covered are:

■ Solving Problems Indicated by LEDs

■ Solving Hardware Problems

■ Solving Communication Problems

■ Solving Software Upgrade Problems

If you experience a problem that is not listed here, it may be included in
the support section of the Switch Management Interface Reference
Guide on the CD-ROM that accompanies your Switch.

For Technical Support information, see Appendix D

.

46 CHAPTER 4: PROBLEM SOLVING

Solving Problems Indicated by LEDs

If the LEDs on the Switch indicate a problem, refer to the list of suggested
solutions below.

The Power or Power/Self Test LED does not light

Check that the power cable is firmly connected to the Switch and to the
supply outlet. If the connection is secure and there is still no power, you
may have a faulty power cord or an internal fault. Check the power cord
by:

■ Testing it in another device

■ Connecting a working power cord to the ‘problem’ device

Then contact your supplier for advice.

On powering up, the Power/Self Test LED lights yellow for about ten
seconds after which it starts flashing green (Switch 3848 only).

On powering-up, the Self Test LED lights red (Switch 3812 and
Switch 3824) or Power/Self Test LED remains yellow (Switch 3848)

This indicates one of the following:

■ A port has failed and has been automatically disabled. You can verify

this by checking that the Port Status LED is flashing Green/Yellow
(fast). This could be due to a loop back failure. If a port fails the Switch
passes its Power On Self Test and continues to operate normally.

■ An internal fan has malfunctioned. If a fan has stopped spinning,

power off the unit and check the air vents for obstructions. If this
situation occurs, the fault LED will light red (Switch 3848 only).

■ The internal PSU has failed and power is being supplied by an external

Redundant Power Supply (RPS). Although the Switch has a fault it will
continue to operate normally.

On Powering up, the Power/Self Test LED lights yellow for about ten
seconds after which it starts flashing green. This is normal and does not
indicate any of the above conditions. (Switch 3848 only)

A Port Status LED is flashing green/yellow

The port has failed and has been automatically disabled. The Switch
passes its Power On Self Test and continues to operate normally, even if
one or more ports are disabled.

Solving Hardware Problems 47

A link is connected and yet the Port Status LED for the port does
not light

Check that:

■ The Switch and the device at the other end of the link (or cable) are

connected securely.

■ The devices at both ends of the link are powered-up

■ The quality of cable is satisfactory

■ Auto-negotiation settings are the same at both ends.

Auto-negotiation problems will occur with 10BASE-T, 100BASE-TX or
1000BASE-T where auto-negotiation is disabled and incorrect cables
are being used (cross-over or straight).

Solving Hardware Problems

In the rare event of your Switch unit experiencing a hardware failure,
refer to the list of suggested solutions below.

A fan failure warning message is received

Your Switch has a fan monitoring system that will generate fan failure
warning messages. Fan failure could potentially reduce the lifetime of the
Switch. The monitoring system polls the fan status at periodic intervals
while the unit is powered up.

Should one or more fans fail within the Switch, a warning message will
be generated in the following ways:

■ RMON Trap — if configured, an RMON trap is generated and sent to

the management workstation.

■ Command Line Interface — an indication of a general hardware

failure is provided through the Top level menu displayed when logging
on to the CLI. For more detailed information about the failure select
the system summary command.

■ Web Interface — an indication of fan failure is provided through the

Device Summary table for the specific unit. In addition all Summary
tables turn red to indicate the fan failure. The device mimic will also
display red flashing fan icons.

For further information about RMON, refer to “Chapter 7: Status
Monitoring and Statistics” in the Switch Implementation Guide supplied
in PDF format on the CD-ROM that accompanies the Switch.

48 CHAPTER 4: PROBLEM SOLVING

If a fan failure warning message is generated:

1 Power off the unit.

2 Check that the air vents are not obstructed.

3 Power cycle the unit. To do this, remove and reconnect the AC mains

supply.

4 If a fan fail trap is still received, return the unit.

An SNMP thermal shutdown trap and email is received

1 Power off the unit.

2 Check that the air vents are not obstructed.

3 Check that the ambient temperatures and environmental conditions meet

those specified in Appendix C

4 Power cycle the unit. If a further thermal shutdown trap is received,

return the unit.

Unit fails or SNMP thermal shutdown trap is received

1 Power cycle the unit. To do this, remove and reconnect the AC mains

supply.

.

2 Check the command line interface (system summary command) to

determine whether a thermal shutdown has occurred.

3 If no, return the unit:

If yes, check that:

■ The air vents are not obstructed.

■ The ambient temperatures and environmental conditions meet those

specified in Appendix C

.

4 Power cycle the unit. If a further thermal shutdown occurs, and all

environmental conditions are satisfactory, return the unit to 3Com.

Solving Communication Problems 49

Error message indicating that the SFP transceiver is invalid

The Switch has identified that the SFP does not meet the minimum
requirements for the Switch and has disabled the port. To correct this
problem, completely remove the SFP and replace it with a 3Com
approved SFP. See ““Approved SFP Transceivers”

on page 26.

Error message indicating that the SFP transceiver is faulty

To correct this problem, completely remove the SFP and then reinsert it.
Alternatively, insert another identical SFP. If the problem persists, contact
3Com Technical Support.

Solving Communication Problems

If you experience communication problems with the Switch, ensure that:

■ The Switch IP address has been configured.

■ If the Switch is separated from your management application by a

router, ensure that the default gateway IP address within the Switch is
the same as the IP address of the router.

■ The Switch’s IP address has been entered correctly in your network

management application (for example 3Com Network Supervisor).

The following is an brief overview of IP addressing, and how to obtain a
registered IP address.

IP Addressing

To be managed correctly, each device on your network (for example a
Switch or Hub) must have a unique IP address. IP addresses have the
format n.n.n.n where n is a decimal number between 0 and 255. An
example IP address is 192.168.100.8.

The IP address is split into two parts:

■ The first part (‘192.168.100’ in the example) identifies the network on

which the device resides

■ The second part (‘.8’ in the example) identifies the device within the

network

The natural subnet mask for this example is 255.255.255.0.

If your network has a connection to the external IP network, that is, you
access the Internet, you must apply for a registered IP address.

50 CHAPTER 4: PROBLEM SOLVING

How do you obtain a registered IP Address?

The IP registration system ensures that every IP address used is unique; if
you do not have a registered IP address, you may be using an identical
address to someone else and your network will not operate correctly.

InterNIC Registration Services is the organization responsible for
supplying registered IP addresses. The following contact information is
correct at time of publication:

World Wide Web site: http://www.internic.net

If your IP network is internal to your organization only, that is, you do not
access the Internet, you may use any arbitrary IP address as long as it is
not being used by another device on your network. 3Com suggests you
use addresses in the range 192.168.0.0 to 192.168.255.255 with a
subnet mask of 255.255.255.0.

These suggested IP addresses are part of a group of IP addresses that
have been set aside specially for use ‘in house’ only.

Solving Software Upgrade Problems

You can upgrade the management software of the Switch by using the
System > Control > Software Upgrade operation in the Web Interface, or
the system control softwareUpgrade command in the
command line interface.

For details on these options, refer to the Management Interface
Reference Guide supplied in HTML format on the CD-ROM that
accompanies your Switch.

If you have problems with your software upgrade, refer to the Problem
Solving section in the Management Interface Reference Guide.

A

SAFETY INFORMATION

You must read the following safety information before carrying out any
installation or removal of components, or any maintenance procedures
on the Switch 3812, Switch 3824, or Switch 3848.

WARNING: Warnings contain directions that you must follow for your
personal safety. Follow all directions carefully.
You must read the following safety information carefully before you
install or remove the unit.

AVERTISSEMENT: Les avertissements présentent des consignes que vous
devez respecter pour garantir votre sécurité personnelle. Vous devez
respecter attentivement toutes les consignes.
Nous vous demandons de lire attentivement les consignes suivantes de
sécurité avant d’installer ou de retirer l’appareil.

VORSICHT: Vorsicht enthalten Anweisungen, die Sie zu Ihrer eigenen
Sicherheit befolgen müssen. Alle Anweisungen sind sorgfältig zu
befolgen.
Sie müssen die folgenden Sicherheitsinformationen’ sorgfältig
durchlesen, bevor Sie das Gerät installieren oder ausbauen.

Alle Verfahren die in dieser Anleitung beschrieben werden gelten für alle
Modelle, sofern nicht anders angegeben. Wo eine Vorgehensweise für
die Schalter 3812, Schalter 3824, und Schalter 3848 gilt wird nur der
Begriff Schalter verwendet.

Diese Anleitung ist für Netzwerkadministratoren vorgesehen, die für die
Installation und das Einstellen von Netzwerkkomponenten verantwortlich
sind; Erfahrung im Umgang mit LANs (Local Area Networks) wird
vorausgesetzt.

52 APPENDIX A: SAFETY INFORMATION

Important Safety Information

WARNING: Installation and removal of the unit must be carried out by
qualified personnel only.

WARNING: If installing a Switch in a stack with SuperStack
are narrower, the deeper units must be installed below the narrower
units.

WARNING: The unit must be earthed (grounded).

WARNING: Connect the unit to an earthed power supply to ensure

compliance with safety standards.

WARNING: Power Cord Set:
This must be approved for the country where it is used:

®

3 units that

U.S.A. and
Canada

■ The cord set must be UL-approved and CSA certified.

■ The minimum specification for the flexible cord is:

No. 18 AWG
Type SV or SJ
3-conductor

■ The cord set must have a rated current capacity of at least

10A.

■ The attachment plug must be an earth-grounding type

with a NEMA 5-15P (15A, 125V) or NEMA 6-15P (15A,
250V) configuration.

United
Kingdom only

■ The supply plug must comply with BS1363 (3-pin 13 amp)

and be fitted with a 5A fuse which complies with BS1362.

■ The mains cord must be <HAR> or <BASEC> marked and

be of type H03VVF3GO.75 (minimum).

Europe only: ■ The supply plug must comply with CEE 7/7 (“SCHUKO”).

■ The mains cord must be <HAR> or <BASEC> marked and

be of type H03VVF3GO.75 (minimum).

Denmark ■ The supply plug must comply with section 107-2-D1,

standard DK2-1a or DK2-5a.

Switzerland ■ The supply plug must comply with SEV/ASE 1011.

WARNING: The appliance coupler (the connector to the unit and not the
wall plug) must have a configuration for mating with an EN60320/IEC320
appliance inlet.

Important Safety Information 53

WARNING: The socket outlet must be near to the unit and easily
accessible. You can only remove power from the unit by disconnecting
the power cord from the outlet.

WARNING: This unit operates under SELV (Safety Extra Low Voltage)
conditions according to IEC 60950. The conditions are only maintained if
the equipment to which it is connected also operates under SELV
conditions.

WARNING: France and Peru only:

†

This unit cannot be powered from IT

supplies. If your supplies are of IT
type, this unit must be powered by 230V (2P+T) via an isolation
transformer ratio 1:1, with the secondary connection point labelled
Neutral, connected directly to earth (ground).

†

Impédance à la terre.

WARNING: U.K. only:
If connecting a modem to the console port of the Switch, only use a
modem which is suitable for connection to the telecommunications
system.

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.

WARNING: Fiber Optic ports - Optical Safety

Never look at the transmit laser while it is powered-up. Never look
directly at the fiber ports and fiber cable ends when they are
powered-up.

WARNING: Use of controls or adjustments of performance or
procedures other than those specified herein may result in hazardous
laser emissions.

54 APPENDIX A: SAFETY INFORMATION

L’information de Sécurité Importante

AVERTISSEMENT: L'installation et la dépose de ce groupe doivent être
confiés à un personnel qualifié.

AVERTISSEMENT: Si vous superposez un switch plus etroit que ceux qui
sont sur une pile, if fallait entasser ce switch au dessous des autres.

AVERTISSEMENT: Vous devez mettre l’appareil à la terre (à la masse) ce
groupe.

AVERTISSEMENT: Brancher l’unité à une source de courant mise à la
terre pour assurer la conformité aux normes de sécurité.

AVERTISSEMENT: Cordon électrique:
Il doit être agréé ans le pays d'utilisation:

Etats-Unis et
Canada

Danemark ■ La prise mâle d'alimentation doit respecter la section 107-2

Europe ■ La prise secteur doit être conforme aux normes CEE 7/7

Suisse ■ La prise mâle d'alimentation doit respecter la norme SEV/ASE

■ Le cordon doit avoir reçu l'homologation des UL et un

certificat de la CSA

■ Le cordon souple doit respecter, à titre minimum, les

spécifications suivantes :

■ calibre 18 AWG

■ type SV ou SJ

■ à 3 conducteurs

■ Le cordon doit être en mesure d'acheminer un courant

nominal d'au moins 10 A

■ La prise femelle de branchement doit être du type à mise à la

terre (mise à la masse) et respecter la configuration NEMA
5-15P (15 A, 125 V) ou NEMA 6-15P (15 A, 250 V)

D1 de la norme DK2 1a ou DK2 5a

(“SCHKO”)

■ LE cordon secteur doit porter la mention <HAR> ou

<BASEC> et doit être de type HO3VVF3GO.75 (minimum).

1011

AVERTISSEMENT: Le coupleur d'appareil (le connecteur du groupe et
non pas la prise murale) doit respecter une configuration qui permet un
branchement sur une entrée d'appareil EN60320/CEI 320.

L’information de Sécurité Importante 55

AVERTISSEMENT: La prise secteur doit se trouver à proximité de
l’appareil et son accès doit être facile. Vous ne pouvez mettre l’appareil
hors circuit qu'en débranchant son cordon électrique au niveau de cette
prise.

AVERTISSEMENT: L’appareil fonctionne à une tension extrêmement
basse de sécurité qui est conforme à la norme CEI 60950. Ces conditions
ne sont maintenues que si l'équipement auquel il est raccordé fonctionne
dans les mêmes conditions.

AVERTISSEMENT: France et Pérou uniquement:
Ce groupe ne peut pas être alimenté par un dispositif à impédance à la
terre. Si vos alimentations sont du type impédance à la terre, ce groupe
doit être alimenté par une tension de 230 V (2 P+T) par le biais d'un
transformateur d'isolement à rapport 1:1, avec un point secondaire de
connexion portant l'appellation Neutre et avec raccordement direct à la
terre (masse).

AVERTISSEMENT: Points d’accès RJ-45. Ceux-ci sont protégés par des
prises de données. Ils ne peuvent pas être utilisés comme prises de
téléphone conventionnelles standard, ni pour la connection de l’unité à
un réseau téléphonique central privé ou public. Raccorder seulement
connecteurs de données RJ-45, systèmes de réseaux de téléphonie ou
téléphones de réseaux à ces prises.

Il est possible de raccorder des câbles protégés ou non protégés avec des
jacks protégés ou non protégés à ces prises de données.

AVERTISSEMENT: Ports pour fibres optiques – sécurité sur le plan
optique

Ne regardez jamais le laser tant qu'il est sous tension. Ne regardez jamais
directement le port à fibres optiques et les embouts de câbles à fibres
optiques tant qu'ils sont sous tension.

AVERTISSEMENT: L'utilisation de contrôles, de réglages de
performances ou de procédures autres que ceux qui sont spécifiés au sein

56 APPENDIX A: SAFETY INFORMATION

du présent document risquent d'entraîner l'exposition à des
rayonnements laser dangereux.

Wichtige Sicherheitsinformationen

VORSICHT: Die Installation und der Ausbau des Geräts darf nur durch
Fachpersonal erfolgen.

VORSICHT: Wenn Sie einen Schalter zusammen mit kleineren Einheiten
in einem Stack aufstellen, muss die tiefste Einheit unterhalb der kleineren
Einheiten aufgestellt werden.

VORSICHT: Das Gerät muß geerdet sein.

VORSICHT: Das Gerät muß an eine geerdete Steckdose angeschlossen

werden, die europäische Sicherheitsnormen erfüllt.

VORSICHT: Der Anschlußkabelsatz muß mit den Bestimmungen des
Landes übereinstimmen, in dem er verwendet werden soll.

VORSICHT: Der Gerätestecker (der Anschluß an das Gerät, nicht der
Wandsteckdosenstecker) muß eine passende Konfiguration für einen
Geräteeingang gemäß EN60320/IEC320 haben.

VORSICHT: Die Netzsteckdose muß in der Nähe des Geräts und leicht
zugänglich sein. Die Stromversorgung des Geräts kann nur durch
Herausziehen des Gerätenetzkabels aus der Netzsteckdose unterbrochen
werden.

VORSICHT: Europe

■ Das Netzkabel muß vom Typ HO3VVF3GO.75 (Mindestanforderung)

sein und die Aufschrift <HAR> oder <BASEC> tragen.

■ Der Netzstecker muß die Norm CEE 7/7 erfüllen (”SCHUKO”).

VORSICHT: Der Betrieb dieses Geräts erfolgt unter den
SELV-Bedingungen (Sicherheitskleinstspannung) gemäß IEC 60950. Diese
Bedingungen sind nur gegeben, wenn auch die an das Gerät
angeschlossenen Geräte unter SELV-Bedingungen betrieben werden.

Power Cord Set — Japan 57

VORSICHT: RJ-45-Porte. Diese Porte sind geschützte Datensteckdosen.
Sie dürfen weder wie normale traditionelle Telefonsteckdosen noch für
die Verbindung der Einheit mit einem traditionellem privatem oder
öffentlichem Telefonnetzwerk gebraucht werden. Nur
RJ-45-Datenanscluße, Telefonnetzsysteme or Netztelefone an diese
Steckdosen anschließen.

Entweder geschützte oder ungeschützte Buchsen dürfen an diese
Datensteckdosen angeschlossen werden.

VORSICHT: Faseroptikanschlüsse – Optische Sicherheit

Niemals ein Übertragungslaser betrachten, während dieses eingeschaltet
ist. Niemals direkt auf die Faseransnchlüsse und auf die Faserkabelenden
schauen, während diese eingeschaltet sind.

Power Cord Set —
Japan

VORSICHT: Die Verwendung von Steuerelementen oder die Anpassung
von Leistungen und Verfahren in anderer als der hierin genannten Weise
kann zu gefährlichen Laseremissionen führen.

58 APPENDIX A: SAFETY INFORMATION

PIN-OUTS

B

Null Modem Cable Figure 17 9-pin to RS-232 25-pin (Switch 3812 and Switch 3824)

Figure 18 RJ-45 to RS-232 25-pin (Switch 3848)

60 APPENDIX B: PIN-OUTS

PC-AT Serial Cable Figure 19 9-pin to 9-pin (Switch 3812 and Switch 3824)

Figure 20 RJ-45 to 9-pin (Switch 3848)

Modem Cable 61

Modem Cable Figure 21 9-pin to RS-232 25-pin (Switch 3812 and Switch 3824)

Figure 22 RJ-45 to RS-232 25-pin (Switch 3848)

RJ-45 Pin Assignments

Pin assignments are identical for 10/100 and 1000 RJ-45 connectors.

Table 10 Pin assignments

Pin Number 10/100 1000

Ports configured as MDI

1 Transmit Data + Bidirectional Data A+

2 Transmit Data - Bidirectional Data A-

3 Receive Data + Bidirectional Data B+

4 Not assigned Bidirectional Data C+

62 APPENDIX B: PIN-OUTS

Pin Number 10/100 1000

5 Not assigned Bidirectional Data C-

6 Receive Data – Bidirectional Data B-

7 Not assigned Bidirectional Data D+

8 Not assigned Bidirectional Data D-

Table 11 Pin assignments

Pin Number 10/100 1000

Ports configured as MDIX

1 Receive Data + Bidirectional Data B+

2 Receive Data - Bidirectional Data B-

3 Transmit Data + Bidirectional Data A+

4 Not assigned Bidirectional Data D+

5 Not assigned Bidirectional Data D-

6 Transmit Data - Bidirectional Data A-

7 Not assigned Bidirectional Data C+

8 Not assigned Bidirectional Data C-

TECHNICAL SPECIFICATIONS

C

Switch 3812, Switch 3824, and Switch 3848

Physical Dimensions

Switch 3812 and Switch 3824 Height: 43.6 mm (1.72 in) x Width: 440 mm (17.3 in.) x Depth: 325 mm (12.8 in.).

Weight: 3.7 kg (8.2 lb) (Switch 3812), 4.0 kg (8.8 lb) (Switch 3824).

Switch 3848 Height: 43.6 mm (1.72 in) x Width: 440 mm (17.3 in.) x Depth: 415 mm (16.3 in.).

Environmental Requirements

Operating Temperature 0 ° to 40 °C (32 ° to 104 °F)

Storage Temperature –10 ° to +70 °C (14 ° to 158 °F)

Operating Humidity 10–95% relative humidity, non-condensing

Standards EN60068 to 3Com schedule (package testing: paras 2.1, 2.2, 2.30 and 2.32.

Safety

Agency Certifications UL 60950, EN60950, CSA 22.2 No. 60950, IEC 60950, IEC825-1, EN60825-1

EMC

Emissions CISPRR 22 Class A, EN55022 Class A, FCC Part 15 Subpart B Class A,

Immunity EN 55024

Power Consumption

Switch 3812 53 W maximum

Switch 3824 82 W maximum

Switch 3848 150 W maximum

Heat Dissipation

Switch 3812 181 BTU/hour maximum

Switch 3824 280 BTU/hour maximum

Switch 3848 511 BTU/hour maximum

Power Supply

AC Line Frequency 50/60 Hz

Weight: 5.0 kg (11.0 lbs).

Operational testing: paras 2.1, 2.2, 2.30 and 2.13.

ICES-003 Class A, VCCI Class A, EN61000-3-2, EN61000-3-3

64 APPENDIX C: TECHNICAL SPECIFICATIONS

Input Voltage Options 100–240 VAC

Current Rating 0.44 A maximum (Switch 3812)

0.69 A maximum (Switch 3824)

1.25 A maximum (Switch 3848)

D

OBTAINING SUPPORT FOR YOUR PRODUCT

Register Your Product to Gain Service Benefits

Purchase Value-Added Services

Troubleshoot Online

To take advantage of warranty and other service benefits, you must first
register your product at
services are based on accounts that you create or have authorization to
access. First time users must apply for a user name and password that
provides access to a number of eSupport features including Product
Registration, Repair Services, and Service Request.

To enhance response times or extend warranty benefits, contact 3Com or
your authorized 3Com reseller. Value-added services can include 24x7
telephone technical support, software upgrades, onsite assistance or
advance hardware replacement. Experienced engineers are available to
manage your installation with minimal disruption to your network. Expert
assessment and implementation services are offered to fill resource gaps
and ensure the success of your networking projects. More information on
3Com Extended Warranty and Professional Services is available at

http://www.3com.com/

Contact your authorized 3Com reseller or 3Com for additional product
and support information.

You will find support tools posted on the 3Com web site at

http://www.3com.com/

http://eSupport.3com.com/. 3Com eSupport

■ 3Com Knowledgebase helps you troubleshoot 3Com products. This

query-based interactive tool is located at

http://knowledgebase.3com.com and contains thousands of

technical solutions written by 3Com support engineers.

66 APPENDIX D: OBTAINING SUPPORT FOR YOUR PRODUCT

■ Connection Assistant helps you install, configure and troubleshoot

3Com desktop and server NICs, wireless cards and Bluetooth devices.
This diagnostic software is located at:

http://www.3com.com/prodforms/software/connection_assistan
t/ca_thankyou.html

Access Software Downloads

Software Updates are the bug fix / maintenance releases for the version

of software initially purchased with the product. In order to access these
Software Updates you must first register your product on the 3Com web
site at

http://eSupport.3com.com/.

First time users will need to apply for a user name and password. A link to
software downloads can be found at
under the Product Support heading at

http://eSupport.3com.com/, or

http://www.3com.com/

Software Upgrades are the software releases that follow the software
version included with your original product. In order to access upgrades
and related documentation you must first purchase a service contract
from 3Com or your reseller.

Contact Us 3Com offers telephone, e-mail and internet access to technical support

and repair services. To access these services for your region, use the
appropriate telephone number, URL or e-mail address from the list below.
You will find a current directory of support telephone numbers posted on

http://csoweb4.3com.com/contactus/

Telephone Technical Support and Repair

the 3Com web site at

To obtain telephone support as part of your warranty and other service
benefits, you must first register your product at

http://eSupport.3com.com/

When you contact 3Com for assistance, please have the following
information ready:

■ Product model name, part number, and serial number

■ A list of system hardware and software, including revision level

■ Diagnostic error messages

■ Details about recent configuration changes, if applicable

Telephone Technical Support and Repair 67

To send a product directly to 3Com for repair, you must first obtain a
return authorization number (RMA). Products sent to 3Com, without
authorization numbers clearly marked on the outside of the package, will
be returned to the sender unopened, at the sender’s expense. If your
product is registered and under warranty, you can obtain an RMA
number online at

http://eSupport.3com.com/. First time users will

need to apply for a user name and password.

Telephone numbers are correct at the time of publication. Find a current
directory of support telephone numbers posted on the 3Com web site at

http://csoweb4.3com.com/contactus/

Country Telephone Number Country Telephone Number

Asia, Pacific Rim Telephone Technical Support and Repair

Australia
Hong Kong
India

Indonesia
Japan

Malaysia
New Zealand
Pakistan

You can also obtain support in this region using the following e-mail: [e-mail]

Or request a repair authorization number (RMA) by fax using this number: + 65 543 6348

Europe, Middle East, and Africa Telephone Technical Support and Repair

From anywhere in these
regions, call:

From the following countries, you may use the numbers shown:

Austria
Belgium
Denmark
Finland
France
Germany
Hungary
Ireland
Israel
Italy

You can also obtain support in this region using the following URL:

http://emea.3com.com/support/email.html

1 800 678 515
800 933 486
[phone] or
000800 650 1111
001 803 61009
00531 616 439 or
03 3507 5984
1800 801 777
0800 446 398
[phone]

[phone]

01 7956 7124
070 700 770
7010 7289
01080 2783
0825 809 622
01805 404 747
06800 12813
1407 3387
1800 945 3794
199 161346

Philippines

P. R . of C h in a
Singapore
S. Korea
Ta iw a n
Thailand

Luxembourg
Netherlands
Norway
Poland
Portugal
South Africa
Spain
Sweden
Switzerland
U.K.

1235 61 266 2602 or
1800 1 888 9469
800 810 3033
800 6161 463
080 333 3308
00801 611 261
001 800 611 2000

342 0808128
0900 777 7737
815 33 047
00800 441 1357
707 200 123
0800 995 014
9 021 60455
07711 14453
08488 50112
0870 241 3901

68 APPENDIX D: OBTAINING SUPPORT FOR YOUR PRODUCT

Country Telephone Number Country Telephone Number

Latin America Telephone Technical Support and Repair

Antigua
Argentina
Aruba
Bahamas
Barbados
Belize
Bermuda
Bonaire
Brazil
Cayman
Chile
Colombia
Costa Rica
Curacao
Ecuador
Dominican Republic

You can also obtain support in this region using the following:

Spanish speakers, enter the URL:

http://lat.3com.com/lat/support/form.html

Portuguese speakers, enter the URL:

http://lat.3com.com/br/support/form.html

English speakers in Latin America should send e-mail to:

[e-mail]

1 800 988 2112
0 810 444 3COM
1 800 998 2112
1 800 998 2112
1 800 998 2112
52 5 201 0010
1 800 998 2112
1 800 998 2112
0800 13 3COM
1 800 998 2112
AT&T [phone]
AT&T [phone]
AT&T [phone]
1 800 998 2112
AT&T [phone]
AT&T [phone]

Guatemala
Haiti
Honduras
Jamaica
Martinique
Mexico
Nicaragua
Panama
Paraguay
Peru
Puerto Rico
Salvador
Trinidad and Tobago
Uruguay
Venezuela
Virgin Islands

AT&T [phone]
57 1 657 0888
AT&T [phone]
1 800 998 2112
571 657 0888
01 800 849CARE
AT&T [phone]
AT&T [phone]
54 11 4894 1888
AT&T [phone]
1 800 998 2112
AT&T [phone]
1 800 998 2112
AT&T [phone]
AT&T [phone]
57 1 657 0888

US and Canada Telephone Technical Support and Repair

1 800 876 3266

INDEX 69

INDEX

A

access levels of default users 44
automatic setup 36

3Com Network Supervisor 36
console port 36

C

cable

10/100/1000 24

pin-outs 59
CD-ROM 9
command line interface

management 39
console port 14
conventions

notice icons, About This Guide 8

text, About This Guide 8
cross-over configuration 24

D

default

settings 17

users 44

L

LEDs 15
logging in as a default user 44

M

management

methods 39
preparing for 32
setting up 29, 30

manual setup

console port 32
MDI configuration 24
MDIX configuration 24

P

passwords

of default users 44
pin assignments

modem cable 61

null modem cable 59

RJ45 61

serial cable 60
pin-outs 59
ports

10/100/100 14
power socket 17
powering-up the Switch 23
problem solving 45

communication problems 49

hardware problems 47

IP addressing 47

LEDs 46

F

factory defaults 17

H

hardware features 12

I

installing the Switch 19

prerequisites 21

IP addressing

registered 50

IP configuration 31

R

rack mounting a Switch 21
redundant power system socket 17

S

safety information

English 52

French 54

German 56
SFP

Operation 25

transceivers 25
Simple Network Management Protocol. See SNMP
SNMP 43
SNMP management 40

70 INDEX

setting up 43
specifications, system 63
straight-through configuration 24
Switch

automatic setup 36

dimensions 63

features 12

installation 19, 21

powering-up 23

rack mounting 21

size 63

weight 63
system specifications 63

T

troubleshooting 45

W

web interface management 40

setting up 42

REGULATORY NOTICES

FCC STATEMENT This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to

part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference to radio communications, in which case the user will be required to
correct the interference at their own expense.

INFORMATION TO THE USER If this equipment does cause interference to radio or television reception, which can be determined by

turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of
the following measures:

■ Reorient the receiving antenna.

■ Relocate the equipment with respect to the receiver.

■ Move the equipment away from the receiver.

■ Plug the equipment into a different outlet so that equipment and receiver are on different branch circuits.

If necessary, the user should consult the dealer or an experienced radio/television technician for additional
suggestions. The user may find the following booklet prepared by the Federal Communications Commission
helpful:

How to Identify and Resolve Radio-TV Interference Problems

This booklet is available from the U.S. Government Printing Office, Washington, DC 20402, Stock No.
004-000-00345-4.

In order to meet FCC emissions limits, this equipment must be used only with cables which comply with IEEE

802.3.

CSA STATEMENT This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment

Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur
du Canada.

CE STATEMENTS (EUROPE) This product complies with the European Low Voltage Directive 73/23/EEC and EMC Directive 89/336/EEC as

amended by European Directive 93/68/EEC.

Warning: This is a class A product. In a domestic environment this product may cause radio interference in
which case the user may be required to take adequate measures.

You must only insert a 3Com approved SFP transceiver into the Switch. These are listed in the "Approved SFP
Transceivers" section of the Getting Started Guide.

VCCI STATEMENT