3COM C17302, C17304, 3C17300 User Manual

SuperStack® 3

Switch 4200 Series Getting Started Guide

3C17300 3C17302 3C17304

http://www.3com.com/

Part No. DUA1730-0AAA02 Published October 2002

3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145

Copyright © 2002, 3Com Technologies. 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 Technologies.

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

3Com Technologies provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

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

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this User Guide.

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

3Com, the 3Com logo and SuperStack are all registered trademarks of 3Com Corporation. Novell and NetWare are registered trademarks of Novell Incorporated. Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated. All other company and product names may be trademarks of the respective companies with which they are

associated.

Environmental Statement

It is a 3Com policy to be environmentally friendly in all operations. This manual is printed on paper that comes from sustainable, managed European forests. The production process for making the pulp has a reduced AOX level (adsorbable organic halogen) resulting in elemental chlorine-free paper.

The paper is fully biodegradable and recyclable.

CONTENTS

ABOUT THIS GUIDE

Conventions 8 Related Documentation 9

Accessing Online Documentation 10 Product Registration 10 Documentation Comments 10

1 INTRODUCING THE

UPERSTACK 3 SWITCH 4200 SERIES

About the Switch 4200 Series 12

Summary of Hardware Features 12 Switch 4200 Series — Front View Detail 13

10BASE-T/ 100BASE-TX Ports 14

10/100/1000BASE-T Ports 14

GBIC Ports 14

LEDs 15 Switch 4200 Series — Rear View Detail 17

Power Socket 17

Redundant Power System Socket 17

Console Port 17 Default Settings 18

2 INSTALLING THE SWITCH

Package Contents 20 Choosing a Suitable Site 20 Rack-mounting 21 Placing Units On Top of Each Other 23 Stacking Units 23 The Power-up Sequence 24

Powering-up the Switch 4200 Series 24

Checking for Correct Operation of LEDs 24 Connecting a Redundant Power System 25 Choosing the Correct Cables 25 Choosing the correct Fiber cables 26

GBIC Operation 27

Approved GBIC Transceivers 27 Inserting a GBIC Transceiver 27

3 SETTING UP FOR MANAGEMENT

Setting Up Overview 32

IP Configuration 33 Preparing for Management 34

Manually Configuring IP Information 35

Connecting to a Front Panel Port 35 Connecting to the Console Port 38

Viewing Automatically Configured IP Information 42

Using 3Com Network Supervisor 42 Connecting to the Console Port 42

Methods of Managing a Switch 45

Command Line Interface Management 45 Web Interface Management 46 SNMP Management 46

Setting Up Command Line Interface Management 47

CLI Management via the Console Port 47 CLI Management over the Network 47

Setting Up Web Interface Management 48

Pre-requisites 48 Web Management Over the Network 49

Setting Up SNMP Management 49

Pre-requisites 50

Default Users and Passwords 50

Changing Default Passwords 50

4 PROBLEM SOLVING

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

Solving Stack Formation Problems 56 Solving Software Upgrade Problems 57

A SAFETY INFORMATION

Important Safety Information 60 L’information de Sécurité Importante 62 Wichtige Sicherheitsinformationen 64

B PIN-OUTS

Null Modem Cable 67 PC-AT Serial Cable 67 Modem Cable 68 RJ-45 Pin Assignments 68 1000BASE-T RJ-45 Pin Assignments 69

C TECHNICAL SPECIFICATIONS

Switch 4226T (3C17300) 71

Switch 4250T (3C17302) 73

Switch 4228G (3C17304) 74

D TECHNICAL SUPPORT

Online Technical Services 75

World Wide Web Site 75

3Com Knowledgebase Web Services 76

3Com FTP Site 76 Support from Your Network Supplier 76 Support from 3Com 77

Internet Support 77

Telephone Support 77 Returning Products for Repair 79

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

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

SuperStack

3 Switch 4200 in its default state.

This guide is intended for use with all Switch 4200 Series models:

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

2 10/100/1000BASE-T ports

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

2 10/100/1000BASE-T ports

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

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

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

The guide is intended for use by network administrators who are responsible for installing and setting up network equipment; consequently, it assumes a basic working knowledge of LANs (Local Area Networks).

If the information in the release notes that are shipped with your product differ from the information in this guide, follow the instructions in the release notes.

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.

Table 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

Warning Information that alerts you to potential personal injury

Table 2 Text Conventions

Convention Description

Screen displays This typeface represents information as it appears on the

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

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

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:

potential damage to an application, system, or device

screen.

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>.

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

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.

Product Registration

Documentation Comments

You can register your SuperStack 3 Switch 4200 on the 3Com Web site:

http://3com.com/register

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 DUA 1730-0AAA0x SuperStack 3 Switch 4200 Series Getting Started Guide Page 21

INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

This chapter contains introductory information about the Switch 4200 Series and how it can be used in your network. It covers summaries of hardware and software features and also the following topics:

■ About the Switch 4200 Series

■ Switch 4200 Series — Front View Detail

■ Switch 4200 Series — Rear View Detail

■ Default Settings

12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

About the Switch 4200 Series

Summary of

Hardware Features

The Switch 4200 Series are stackable 10/100/1000 Mbps devices which consists of:

■ 24 or 48 10BASE-T/100BASE-TX ports

■ 2 10/100/1000BASE-T ports

■ 2 GBIC ports (Switch 4228G only)

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

SuperStack

system as your network grows.

Ta bl e 3 summarizes the hardware features that are supported by the

Switch 4200 Series.

Table 3 Hardware features

Feature Switch 4200 Series Addresses ■ Up to 8000 supported

■ Up to 64 permanent entries

Auto-negotiation ■ Supported on all ports

■ Auto MDI/MDI-X

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

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

Flow Control In full duplex operation all ports are supported Smart Auto-sensing Supported on all ports except GBIC ports which are

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

Ports Gigabit Ethernet Auto-negotiating 10/100/1000BASE-T ports GBIC Auto-negotiating GBIC ports (Switch 4228G only) RPS Support Connects to SuperStack Advanced Redundant

Mounting 19-inch rack or stand-alone mounting

single speed ports. Smart auto-sensing allows auto-negotiating ports to

monitor and detect a high error rate on a link, or a problem in the "physical" interconnection to another port and react accordingly.

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

Power System (ARPS) (3C16071, 3C16071A or 3C16071B)

About the Switch 4200 Series 13

Switch 4200 Series — Front View Detail

153

3262

427

6175

10BASE-T / 100BASE-TX

6295

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

10BASE-T / 100BASE-TX

RJ-45 Ports

Unit LEDs

910221123 12 24

197

Power / Self Test LED

Power/

Self Test

25 / Up

2 3

26 / Down

Alert

Unit

Alert LED

10/100/1000BASE-T

ports

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

RJ-45 Ports

31730

13361235

153814

3C17300 Superstack 3Switch 4226T

3C17302 Superstack 3Switch 4250T

194218

Unit LEDs

234622452144

Power / Self Test LED

Power/ Self Test

Alert

Unit

Alert LED

10/100/1000BASE-T

ports

Down

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

10BASE-T / 100BASE-TX

RJ-45 Ports

Unit LEDs

153

6175

197

910221123 12 24

Alert LED

Power / Self Test LED

Power/

Self Test

25 / Up

Alert

Unit

26 / Down

10/100/1000BASE-T

ports

3C17304 Superstack 3

GBIC ports

Switch 4228G

14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

WARNING: RJ-45 Ports. These are shielded RJ-45 data sockets. They cannot be used as standard traditional telephone sockets, or to connect the unit to a traditional PBX or public telephone network. Only connect RJ-45 data connectors, network telephony systems, or network telephones to these sockets.

Either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets.

10BASE-T/

100BASE-TX Ports

10/100/1000BASE-T

Ports

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

The Switch has 24 or 48 auto-negotiating 10BASE-T/100BASE-TX ports configured as Auto MDIX (cross-over). While auto-negotiation is enabled, these ports can automatically detect whether they need to operate in MDI or MDIX mode. Alternatively, you can manually set these ports to 10BASE-T half duplex, 10BASE-T full duplex, 100BASE-TX half duplex or 100BASE-TX full duplex. The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable.

The Switch has two auto-negotiating 10/100/1000BASE-T ports configured as Auto MDIX (cross-over). While auto-negotiation is enabled, these ports can automatically detect whether they need to operate in MDI or MDIX mode. These ports provide 10/100/1000 Mbps full duplex connections to other Gigabit Ethernet devices. Full duplex allows packets to be transmitted and received simultaneously which, in effect, doubles the potential throughput of a link. These ports require either straight-through or cross-over Category 5 cables with RJ-45 connectors at both ends. The maximum UTP cable length is 100 m (328 ft) over Category 5 cable.

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

The two GBIC ports support Category 5 twisted pair cable and fiber Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul (LH70) GBIC transceivers in any combination. This offers you the flexibility of using GBIC transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high capacity aggregated link backbone connection.

About the Switch 4200 Series 15

Fiber GBIC's.

The default state for these ports is auto-negotiation enabled, where speed, duplex and flow control modes are negotiated. Because the speed and duplex modes are fixed by the media type, only the flow control is negotiated with the link partner. Alternatively, auto-negotiation can be disabled and the flow control setting can be manually configured.

1000BaseT GBIC's

These ports will auto-negotiate to 1000BASE-T, full duplex only. Although it is not possible to disable auto-negotiation it is possible to change the advertised capabilities for flow control support, effectively enabling or disabling flow control.

LEDs Ta ble 4 lists LEDs visible on the front of the Switch, and how to read their

status according to color. For information on using the LEDs for problem solving, see “Solving Problems Indicated by LEDs”

on page 54.

It is not possible to determine the duplex mode from the LEDs. For more detailed information, refer to the “SuperStack

3 Switch Management Interface Reference Guide” on the CD-ROM that is supplied with the Switch.

Table 4 LED behavior

LED Color Indicates Port Status LEDs 10BASE-T/100BASE-TX ports

Green A 100 Mbps link is present and the port is enabled. Green flashing Packets are being transmitted/received on the port. Yellow A 10 Mbps link is present and the port is enabled. Yellow flashing Packets are being transmitted/received on the port. Green / Yellow

alternating Off No link is present.

Port Status LEDs GBIC ports

Green A 1000 Mbps link is present and the port is enabled. Green flashing Packets are being transmitted/received on the port.

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

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

(continued)

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

16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

LED Color Indicates

Green flashing Packets are being transmitted/received on the port. Yellow A 10 or 100 Mbps link is present and the port is enabled. Yellow flashing Packets are being transmitted/received on the port. Green / Yellow

alternating Off No link is present.

Unit LEDs

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

Off The Switch initialization process is not complete.

Power/Self Test LED

Green The Switch is powered-up and operating normally. Green flashing The Switch is either downloading software or is initializing

Yellow The Switch has failed its Power On Self Test.

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

Alert LED

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

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

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

Series units the LED indicates the position of the unit in the stack and that a link is present. Unit LED number 1 can also indicate a stand-alone Switch.

(which includes running a Power On Self Test).

Refer to Chapter 4 Solving Problems Indicated by LEDs.

Power Supply Unit.

Interface to flash.

Interface to be off (Default state).

About the Switch 4200 Series 17

Switch 4200 Series — Rear View Detail

Power Socket

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

Redundant Power

System Socket

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

Figure 4 Switch 4200 Series — rear view

Supply Data Warning Label

Console

(max) 19200,8,1,N

Redundant Power System Socket

Console Port

in the range 90-240 VAC.

To protect against internal power supply failure, you can use this socket to connect a Switch 4200 to a SuperStack Advanced Redundant Power System (RPS). See “Connecting a Redundant Power System”

on page 25.

local out-of-band management. The console port uses a standard null modem cable and is set to auto-baud, 8 data bits, no parity and 1 stop bit.

18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES

Default Settings Ta b le 5 shows the default settings for the Switch 4200 Series:

Table 5 Default Settings

Feature Switch 4200 Series Automatic IP Configuration Enabled Port Status Enabled Port Speed All ports are auto-negotiated Duplex Mode All ports are auto-negotiated Flow Control ■ Enabled in half duplex

■ Auto-negotiated in full duplex

Broadcast Storm Control Enabled Virtual LANs (VLANs) All ports belong to the untagged Default VLAN

IP Multicast Filtering Filtering enabled Rapid Spanning Tree Protocol Fast Start: RMON Alarm Enabled Smart Auto-Sensing Enabled LACP (10/100/1000BASE-T ports and GBIC ports only)

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

(VLAN 1) with 802.1Q learning operational

Enabled Enabled on all ports

Enabled

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

If you initialize a Switch unit by selecting System > Control > Initialize in the Web interface or by entering system control initialize

the Command Line Interface, the following settings are retained to allow you to connect to and manage the Switch:

■ IP Address

■ Subnet Mask

■ Default Router

INSTALLING THE SWITCH

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

■ Package Contents

■ Choosing a Suitable Site

■ Rack-mounting

■ Placing Units On Top of Each Other

■ The Power-up Sequence

■ GBIC Operation

WARNING: Safety Information. Before installing or removing any components from the Switch 4200 Series or carrying out any maintenance procedures, you must read the safety information provided in Appendix A

of this guide.

AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever tout composant du Switch 4200 ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans l'Appendice A de ce guide.

VORSICHT: Sicherheitsinformationen. Bevor Sie Komponenten aus dem Switch 4200 entfernen oder dem Switch 4200 hinzufuegen oder Instandhaltungsarbeiten verrichten, lesen Sie die Sicherheitsanweisungen, die in Appendix A (Anhang A) in diesem Handbuch aufgefuehrt sind.

20 CHAPTER 2: INSTALLING THE SWITCH

Package Contents ■ Switch unit

■ CD-ROM

■ Getting Started Guide (this guide)

■ Management Quick Reference Guide

■ Release Notes

■ Unit Information Labels

■ Warranty Information

■ Power Cord

■ 2 x Mounting brackets

■ 4 x Screws

■ 4 x Rubber feet

Choosing a Suitable Site

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

CAUTION: Ensure that the ventilation holes are not obstructed.

When deciding where to position the Switch, ensure that:

■ Cabling is located away from:

■ sources of electrical noise such as radios, transmitters and

broadband amplifiers.

■ power lines and fluorescent lighting fixtures

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

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

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

side of the Switch. 3Com recommends that you provide a minimum of 25mm (1in.) clearance.

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

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

Rack-mounting 21

■ 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 and laser printers.

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

the units are free-standing.

Rack-mounting The Switch 4200 Series are 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

Switch, as shown in Figure 5

22 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 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. 7 Finally place a unit information label on the unit in an easily accessible

position. The unit information label shows the following:

■ The 3Com product name of the Switch

■ The 3Com 3C number of the Switch

■ The unique MAC address (Ethernet address) of the Switch

■ The serial number of the Switch

You may need this information for fault reporting purposes.

Placing Units On Top of Each Other 23

Placing Units On Top of Each Other

If the Switch units are free-standing, up to eight units can be placed one

on top of the other. If you are mixing a variety of SuperStack

3 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, ensuring that the pads of the upper unit line up with the recesses of the lower unit.

Stacking Units Up to four Switch 4200 Series units can be stacked together and then

treated as a single manageable unit with one IP address. Any combination of Switch 4200 Series units is allowed in a single stack. The units are connected together via the 10/100/1000BASE-T ports on the front of the unit as shown in Figure 6 the port marked with ‘up’ is connected to the port marked with ‘down’ on the unit above. Cable lengths of between 14 cm (5.5 in) and 100 m (328 ft) can be used for stacking.

Figure 6 Stacking example

3262

6295

427

153

31730

6175

197

6175

197

6175

197

910221123 1224

. Starting from the base of the stack,

13361235

Power/

SelfTest

25/ Up

Alert

Unit

Power/

SelfTest

25/ Up

Alert

Unit

Power/

SelfTest

25/ Up

Alert

Unit

153814

26/ Down

194218

3C17304Superstack 3 Switch 4228G

3C17300Superstack 3 Switch 4226T

3C17302Superstack 3 Switch 4250T

234622452144

Power/ SelfTest

Alert

Unit

Down

The unit LEDs will display the unit number in the stack, from 1 at the bottom to 4 at the top.

3Com recommends that when you add a new unit to a stack, you should first initialize it to factory default settings

Stack renumbering occurs when another Switch 4200 Series unit is added to the bottom of an established stack except when the stack is already 4 units high. In this instance the ‘down’ port on the bottom unit of the existing stack will be disabled and its LED will flash green. You will then not be able to use that port again until the link is lost on that port.

24 CHAPTER 2: INSTALLING THE SWITCH

When another Switch 4200 Series unit is added to the top of an established stack, no stack renumbering occurs. If however the unit being added takes the stack height above 4 then the ‘up’ port on the top unit of the existing stack will be disabled and its LED will flash green. You will then not be able to use that port again until the link is lost on that port.

When removing a Switch from a stack, note the following:

■ Removing a Switch 4200 Series unit from the bottom of an existing

stack will cause the remaining stack to renumber.

■ Removing a Switch 4200 Series unit from the middle of an existing

stack will cause the other Switches in the stack to divide into two stacks. Units below the unit removed will not renumber, units above will renumber.

■ Removing a Switch 4200 Series unit from the top of an existing stack

will have no effect on the remaining stack.

If you are having problems, refer to “Solving Stack Formation Problems” on page 56

The Power-up Sequence

Powering-up the

Switch 4200 Series

Checking for Correct

Operation of LEDs

The following sections describe how to get your Switch 4200 Series 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 10 seconds.

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

When the POST has completed, check the Power On Self Test LED t o make sure that your Switch is operating correctly. Ta b le 6

shows possible

colors for the LED.

The Power-up Sequence 25

Table 6 Power/Self Test LED colors

Color State

Green The Switch is powered-up and operating normally. Yellow The Switch has failed its Power On Self Test. Off The Switch is not receiving power.

In addition, check the Unit LEDs on all Switches in the stack. If a Unit LED is off, initialization is not complete. 3Com recommends that you do not use the Switch's management interface until the Unit LED is green.

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

Connecting a

Redundant Power

System

Choosing the Correct

Cables

You can connect a SuperStack Advanced Redundant Power System (3C16071, 3C16071A or 3C16071B) to the Switch. This unit, which is also known as an RPS, is designed to maintain the power to your Switch if a power supply failure occurs.

For normal redundancy, the unit requires one Type 2A Power Module (part number 3C16074A). For full redundancy, the unit requires two type 2A Power Modules combined using a Type 2 Y-Cable (part number 3C16078).

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.

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

All of the ports on the front of the Switch 4200 Series are Auto-MDIX, that is they have a cross-over capability. The port can automatically detect whether it needs to operate in MDI or MDIX mode. Therefore you can make a connection to a port 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

26 CHAPTER 2: INSTALLING THE SWITCH

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 ble 7

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

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 cables 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.

Table 7 Cables required to connect the Switch 4200 Series to other devices if

auto-negotiation is disabled

Choosing the correct

Fiber cables

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)

✓ ✓

✕ ✕

✓

Choose from the following cable options:

■ The 1000BASE-SX ports can be connected to multimode fiber cables

only.

■ The 1000BASE-LX and LH70 GBIC ports use multimode or

single-mode fiber optic cables.

For detailed information on fiber cable specifications, refer to the SuperStack 3 Implementation Guide that accompanies your Switch.

If you wish to connect a 1000BASE-SX MT-RJ port to a fiber port with a different type of connector, for example, SC or ST please contact your network supplier for a suitable patch cable.

+ 58 hidden pages