3COM SuperStack 3 User Manual 2

SuperStack® 3

Switch 4200 Family

Getting Started Guide

Switch 4200 26-Port (3C17300A)

Switch 4200 50-Port (3C17302A)

Switch 4200 28-Port (3C17304A)

http://www.3com.com/

Part No. DUA1730-0AAA03

Published July 2005

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

Copyright © 2002, 2005 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Technologies.

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

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

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

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

Documentation Comments 10

1INTRODUCING THE

SUPERSTACK 3 SWITCH 4200 FAMILY

	About the Switch 4200 Family			12
	Summary of Hardware Features				12
	Switch 4200 Family — Front View Detail					13
	10BASE-T/ 100BASE-TX Ports				14
	10/100/1000BASE-T Ports			14
	SFP Ports 14
	LEDs 15
	Switch 4200 Family — Rear View Detail					16
	Power Socket	16
	Console Port	16
	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				23
	Stacking Units	23
	The Power-up Sequence		24
	Powering-up the Switch 4200 Family					24
	Checking for Correct Operation of LEDs 24
	SFP Operation	25

	Approved SFP Transceivers				25
	Inserting an SFP Transceiver				26
	Removing an SFP Transceiver				27
	Choosing the Correct Cables				27
	Choosing the Correct Fiber Cables 28
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				51
4 PROBLEM SOLVING
	Solving Problems Indicated by LEDs					54
	Solving Hardware Problems			54
	Solving Communication Problems					55
	Solving Stack Formation Problems					56
	Solving Software Upgrade Problems					56

A	SAFETY INFORMATION
	Important Safety Information 58
	L’information de Sécurité Importante		60
	Wichtige Sicherheitsinformationen		62
	Información de seguridad importante		64
	Importanti informazioni di sicurezza		66
B
	PIN-OUTS
	Null Modem Cable	69
	PC-AT Serial Cable	69
	Modem Cable 70

RJ-45 Pin Assignments 70

C TECHNICAL SPECIFICATIONS

Switch 4200 26-Port (3C17300A) 73

	Switch 4200 50-Port
	(3C17302A)	74
	Switch 4200 28-Port
	(3C17304A)	75
D OBTAINING SUPPORT FOR YOUR PRODUCT
	Register Your Product		77
	Purchase Value-Added Services			77
	Troubleshoot Online		78
	Access Software Downloads			78

Telephone Technical Support and Repair 78

Contact Us 79

REGULATORY NOTICES

INDEX

ABOUT THIS GUIDE

This guide provides all the information you need to install and use a SuperStack® 3 Switch 4200 in its default state.

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

■Switch 4200 26-Port (3C17300A) — 24 10BASE-T/100BASE-TX ports, 2 10/100/1000BASE-T ports

■Switch 4200 50-Port (3C17302A) — 48 10BASE-T/100BASE-TX ports, 2 10/100/1000BASE-T ports

■Switch 4200 28-Port (3C17304A) — 24 10BASE-T/100BASE-TX ports, 2 10/100/1000BASE-T ports and 2 SFP ports

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

For details on the Switch 4226T (3C17300), Switch 4250T (3C17302) and Switch 4228G (3C17304), refer to the following document:

■SuperStack 3 Switch 4200 Family Getting Started Guide (part number DUA1730-0AAA04)

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

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

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

8 ABOUT THIS GUIDE

Most user guides and release notes are available in Adobe Acrobat

Reader Portable Document Format (PDF) or HTML on the 3Com

World Wide Web site:

http://www.3com.com/

Conventions	Table 1 and Table 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
				potential damage to an application, system, or device
		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
			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”		When you see the word “enter” in this guide, you must type
	and “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

Related Documentation

9

Table 2 Text Conventions (continued)

Convention	Description
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	In addition to this guide, each Switch documentation set includes the
Documentation	following:
	■ SuperStack 3 Switch Implementation Guide
	This guide contains information on the features supported by your
	Switch and how they can be used to optimize your network. It is
	supplied in PDF format on the CD-ROM that accompanies the Switch.
	■ SuperStack 3 Switch Management Quick Reference Guide
	This guide contains:
	■ a list of the software features supported by the Switch.
	■ a summary of the web interface and command line interface
	commands for the Switch.
	■ SuperStack 3 Switch Management Interface Reference Guide
	This guide provides detailed information about the web interface and
	command line interface that enable you to manage the Switch. It is
	supplied in HTML format on the CD-ROM that accompanies the
	Switch.
	■ Release Notes
	These notes provide information about the current software release,
	including new features, modifications, and known problems.

10 ABOUT THIS GUIDE

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

■Documentation accompanying 3Com Network Supervisor. You can download 3Com Network Supervisor and supporting documentation from the 3Com Web site at:

www.3com.com/3ns

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

■SuperStack 3 Switch Management Quick Reference Guide (PDF format)

■SuperStack 3 Switch Implementation Guide (PDF format)

■SuperStack 3 Switch Management Interface Reference Guide (HTML format)

1To access the documentation insert the CD-ROM into your CD-ROM drive. If your PC has auto-run enabled, a splash screen will be displayed automatically.

2Select the Documentation section from the contents page.

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

■The HTML Reference Guide is stored in the Docs/reference directory on the CD-ROM. The documentation is accessed using the index.htm file.

■The PDF Quick Reference Guide and PDF Implementation Guide are stored in the Docs/implementation directory of the CD-ROM.

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

1	INTRODUCING THE
	SUPERSTACK 3 SWITCH 4200

FAMILY

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

■About the Switch 4200 Family

■Switch 4200 Family — Front View Detail

■Switch 4200 Family — Rear View Detail

■Default Settings

This Getting Started Guide describes the following units in the Switch 4200 Family:

■Switch 26-Port (3C17300A)

■Switch 50-Port (3C17302A)

■Switch 28-Port (3C17304A)

For details on the Switch 4226T (3C17300), Switch 4250T (3C17302) and Switch 4228G (3C17304), refer to the following document:

■SuperStack 3 Switch 4200 Family Getting Started Guide (part number DUA1730-0AAA04)

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

12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 FAMILY

About the Switch	The Switch 4200 Family are stackable 10/100/1000 Mbps devices which
4200 Family	consist of:
	■ 24 or 48 10BASE-T/100BASE-TX ports
	■	2	10/100/1000BASE-T ports
	■	2	SFP ports (Switch 4200 28-Port only)

The Switch provides high-performance workgroups with a backbone to server connection. You can also add the Switch 4200 Family to any SuperStack® system as your network grows.

Summary of Table 3 summarizes the hardware features that are supported by the Hardware Features Switch 4200 Family.

Table 3 Hardware features

Feature	Switch 4200 Family
Addresses	■ Up to 8000 supported
	■ Up to 64 permanent entries
Auto-negotiation	■ Supported on all ports
	■ Auto MDI/MDI-X
Forwarding Modes	Store and Forward
Duplex Modes	Half and full duplex on all 10/100 ports. Full duplex
	on 1000BASE-T ports and full duplex on SFP ports
Flow Control	In full duplex operation all ports are supported
Smart Auto-sensing	Supported on all ports except SFP ports which are
	single speed ports.
Traffic Prioritization	Supported (IEEE 802.ID): 2 queues per port
Ethernet and Fast Ethernet	Auto-negotiating 10BASE-T/100BASE-TX ports
Ports
Gigabit Ethernet	Auto-negotiating 10/100/1000BASE-T ports
SFP Gigabit Ethernet Ports	Supports fiber Gigabit Ethernet short-wave (SX),
	long-wave (LX), long-haul (LH70) and copper (T)
	transceivers in any combination (Switch 4200
	28-Port only)
Mounting	19-inch rack or stand-alone mounting

About the Switch 4200 Series 13

Switch 4200 Family Figure 1 Switch 4200 26-Port (3C17300A) — front view

— Front View Detail

10BASE-T / 100BASE-TX

RJ-45 Ports

Power / Self Test LED

Unit LEDs

1	13	2	14	3 15	4 16	5 17	6 18	7 19	8 20	9	21	10 22	11 23	3C17300A Superstack 3 Switch 4200 26-Port
														12 24

Power/

Self Test

1	25 / Up	26 / Down
2
3	Alert
4	Unit

Alert LED

10/100/1000BASE-T ports

Figure 2 Switch 4200 50-Port (3C17302A) — front view

10BASE-T / 100BASE-TX

RJ-45 Ports

Unit LEDs

Power / Self Test LED

																																							3C17302A Superstack 3 Switch 4200 50-Port
1	25	2	26	3	27	4	28	5	29	6	30	7	31	8	32	9	33	10	34	11	35	12	36	13	37	14	38	15	39	16	40	17	41	18	42	19	43	20	44	21 45	22 46	23 47	24	48	Power/
																																													Self Test
																																												1
																																												2			Down
																																												3	Alert	Up

4 Unit

49

50

Alert LED

10/100/1000BASE-T ports

Figure 3 Switch 4200 28-Port (3C17304A) — front view

10BASE-T / 100BASE-TX

RJ-45 Ports

Power / Self Test LED

Unit LEDs

1	13	2	14	3 15	4 16	5 17	6 18	7 19	8 20	9	21	10 22	11 23	12 24				3C17304A Superstack 3 Switch 4200 28-Port
															Power/
															Self Test		27
														1	25 / Up	26 / Down	27	28
														2
														3	Alert
														4	Unit		28

Alert LED

10/100/1000BASE-T
ports	SFP Ports

14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 FAMILY

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/ The Switch has 24 or 48 auto-negotiating 10BASE-T/100BASE-TX ports 100BASE-TX Ports configured as Auto MDIX (cross-over). While auto-negotiation is enabled,

these ports can automatically detect whether they need to operate in MDI or MDIX mode. Alternatively, you can manually set these ports to 10BASE-T half duplex, 10BASE-T full duplex, 100BASE-TX half duplex or 100BASE-TX full duplex. The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable.

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

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.

SFP Ports This section applies to the SuperStack 3 Switch 4200 28-Port only.

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

of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high capacity aggregated link backbone connection.

The 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

About the Switch 4200 Series 15

negotiated with the link partner. Alternatively, auto-negotiation can be disabled and the flow control setting can be manually configured.

LEDs Table 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	A 10 or 100 Mbps link is present, but the port is disabled.
	alternating
	Off	No link is present.

Port Status LEDs SFP 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.
	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	A 10, 100 or 1000 Mbps link present but disabled.
	alternating
	Off	No link is present.
Unit LEDs
1–4	Green	When the Switch forms a stack with other Switch 4200
		Family units the LED indicates the position of the unit in the
		stack and that a link is present. Unit LED number 1 can also
		indicate a stand-alone Switch.
	Off	The Switch initialization process is not complete.

16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 FAMILY

LED Color	Indicates
Power/Self Test LED
Green	The Switch is powered-up and operating normally.
Green flashing	The Switch is either downloading software or is initializing
	(which includes running a Power On Self Test).
Yellow	The Switch has failed its Power On Self Test.
	Refer to Chapter 4 Solving Problems Indicated by LEDs.
Off	The Switch is not receiving power or there is a fault with the
	Power Supply Unit.
Alert LED
Green flashing	The Switch Alert LED has been configured via the CLI or Web
	Interface to flash.
Off	The Switch Alert LED has been configured via the CLI or Web
	Interface to be off (Default state).

Switch 4200 Family Figure 4 Switch 4200 Family — rear view

— Rear View Detail

Supply Data Warning Label

Console (max) 19200,8,1,N

Power Socket						Console Port

Power Socket The Switch automatically adjusts its power setting to any supply voltage in the range 100-240 VAC.

Console Port The console port allows you to connect a terminal and perform remote or local out-of-band management. The console port uses a standard null modem cable and is set to auto-baud, 8 data bits, no parity and 1 stop bit.

The Switch 4226T, Switch 4250T and Switch 4228G have a Redundant Power Supply (RPS) connector on the rear panel. Refer to the documentation supplied with these models for details.

About the Switch 4200 Series 17

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

Table 5 Default Settings

Feature	Switch 4200 Family
Automatic IP Configuration	Enabled
Port Status	Enabled
Port Speed	All ports are auto-negotiated, except SFP ports
Duplex Mode	All ports are auto-negotiated, except SFP ports
Flow Control	■ Enabled in half duplex
	■ Auto-negotiated in full duplex
Broadcast Storm Control	Enabled
Virtual LANs (VLANs)	All ports belong to the untagged Default VLAN
	(VLAN 1) with IEEE802.1Q learning operational
IP Multicast Filtering	Filtering enabled
Rapid Spanning Tree Protocol	Enabled
Fast Start	Enabled on all 10/100 Mbps ports
	Disabled on all 1000 Mbps ports
RMON Alarm	Enabled
Smart Auto-Sensing	Enabled
LACP	(10/100/1000BASE-T ports and SFP ports only)
	Disabled
Quality of Service (QoS)	All ports prioritize NBX VoIP IP.
	All ports set to “best effort” for all other traffic.
HOL Protection (QoS)	18 Kb

If you initialize a Switch unit by selecting System > Control > Initialize in the Web interface or by entering system control initialize in the Command Line Interface, the following settings are retained to allow you to connect to and manage the Switch:

■IP Address

■Subnet Mask

■Default Router

18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 FAMILY

2	INSTALLING THE SWITCH

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

■Package Contents

■Choosing a Suitable Site

■Rack-mounting

■Placing Units On Top of Each Other

■The Power-up Sequence

■SFP Operation

■Choosing the Correct Cables

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

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

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

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

AVVERTENZA: Informazioni di sicurezza. Prima di installare o rimuovere qualsiasi componente dal product o di eseguire qualsiasi

20 CHAPTER 2: INSTALLING THE SWITCH

procedura di manutenzione, leggere le informazioni di sicurezza riportate nell'Appendice A della presente guida per l'utente.

Package Contents	■	Switch unit
	■	CD-ROM
	■ Getting Started Guide (this guide)
	■	Release Notes
	■	Unit Information Labels
	■	Warranty Information
	■	Power Cord
	■ 2 x Mounting brackets
	■	4 x Screws
	■ 4 x Rubber feet
Choosing a Suitable	The Switch is suited for use on a desktop, either free standing or
Site	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).

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 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 Family 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

3Insert 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.

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

5Insert the Switch into the 19-inch rack and secure with suitable screws (not provided). Ensure that ventilation holes are not obstructed.

6Connect network cabling.

7Finally 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	If the Switch units are free-standing, up to eight units can be placed one
Top of Each Other	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 feet 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 feet of the upper unit
	line up with the recesses of the lower unit.
Stacking Units	Up to four Switch 4200 Family units can be stacked together and then
	treated as a single manageable unit with one IP address. Any
	combination of Switch 4200 Family 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. Starting from the base of the stack,
	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

1

25

2

26

3

27

4

28

5

29

6

30

7

31

8

32

																						3C17302A Superstack 3 Switch 4200 50-Port
9	33	10	34	11	35	12	36	13	37	14	38	15	39	16	40	17	41	18	42	19	43	20 44	21 45	22 46	23 47	24	48	Power/
																												Self Test
																											1
																											2		Up	Down
																											3	Alert

4 Unit

49

50

1	13	2	14	3 15	4 16	5 17	6 18	7 19	8 20	9	21	10 22	11 23	12 24				3C17304A Superstack 3 Switch 4200 28-Port
															Power/		27
															Self Test
														1	25 / Up	26 / Down	27	28
														2
														3	Alert
														4	Unit		28
1	13	2	14	3 15	4 16	5 17	6 18	7 19	8 20	9	21	10 22	11 23	12 24				3C17304A Superstack 3 Switch 4200 28-Port
															Power/		27
															Self Test		27	28
														1	25 / Up	26 / Down
														2
														3	Alert		28
														4
															Unit

1

13

2

14

3 15

4 16

5 17

6 18

7 19

8 20

9

21

10 22

11 23

12 24

3C17300A Superstack 3 Switch 4200 26-Port

	Power/
	Self Test
1	25 / Up 26 / Down
2
3	Alert
4	Unit

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.

Any Switch 4200 unit can be added to the stack, including the Switch 4226T, the Switch 4250T and the Switch 4228G. You must install the latest software version on all units in the stack.

24 CHAPTER 2: INSTALLING THE SWITCH

Stack renumbering occurs when another Switch 4200 Family 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.

When another Switch 4200 Family 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 Family unit from the bottom of an existing stack will cause the remaining stack to renumber.

■Removing a Switch 4200 Family 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 Family 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	The following sections describe how to get your Switch 4200 Family
Sequence	powered-up and ready for operation.
Powering-up the	Use the following sequence of steps to power-up the Switch.
Switch 4200 Family

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

2Plug 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.

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

SFP Operation 25

When the POST has completed, check the Power On Self Test LED to make sure that your Switch is operating correctly. Table 6 shows possible colors for the LED.

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.
SFP Operation	The following section describes how to insert an SFP transceiver into an
	SFP port on the Switch 4200 28-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 The following list of approved SFP transceivers is correct at the time of

Transceivers publication.

■3CSFP91 SFP (SX)

■3CSFP92 SFP (LX)

■3CSFP93 SFP (T)

■3CSFP97 SFP (LH)

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

26 CHAPTER 2: INSTALLING THE SWITCH

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

■1000BASE-SX SFP transceiver

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

■1000BASE-LX SFP transceiver

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

■1000BASE-LH70 SFP transceiver

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

■1000BASE-T SFP transceiver

This transceiver uses Category 5 copper cabling with RJ-45 connectors and supports segment lengths of up to 100 m (328 ft).

If the SFP transceiver is faulty, it will not operate within the Switch. See “Solving Hardware Problems” on page 49.

Use of non-3Com SFPs is not recommended. 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:

1The 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.

2Hold the transceiver so that the connector is toward you and the product label is visible, as shown in Figure 7. Ensure the wire release lever is closed (in the upright position).

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

CAUTION: SFP transceivers are keyed and can be properly inserted only one way. If the transceiver does not click when you insert it, remove it, turn it over, and reinsert it.

4Remove the plastic protective cover if fitted.

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