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

3Com® Switch 4200G Family

Getting Started Guide

4200G 12-Port (3CR17660-91)

4200G 24-Port (3CR17661-91)

4200G 48-Port (3CR17662-91)

www.3Com.com

Part No. 10014914 Rev. AA

Published July 2006

3Com Corporation

350 Campus Drive

Marlborough,

MA 01752-3064

Copyright © 2006, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

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

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

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

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 and the 3Com logo are registered trademarks of 3Com Corporation.

ntel and Pentium are registered trademarks of Intel Corporation. Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of Novell, Inc. UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company, Ltd.

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

ENVIRONMENTAL STATEMENT

It is the policy of 3Com Corporation to be environmentally friendly in all operations. To uphold our policy, we are committed to:

Establishing environmental performance standards that comply with national legislation and regulations.

Conserving energy, materials and natural resources in all operations.

Reducing the waste generated by all operations. Ensuring that all waste conforms to recognized environmental standards. Maximizing the recyclable and reusable content of all products.

Ensuring that all products can be recycled, reused and disposed of safely.

Ensuring that all products are labelled according to recognized environmental standards.

Improving our environmental record on a continual basis.

End of Life Statement

3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components.

Regulated Materials Statement

3Com products do not contain any hazardous or ozone-depleting material.

Environmental Statement about the Documentation

The documentation for this product is printed on paper that comes from sustainable, managed forests; it is fully biodegradable and recyclable, and is completely chlorine-free. The varnish is environmentally friendly, and the inks are vegetable-based with a low heavy-metal content.

DOWNLOAD THE LATEST

SOFTWARE AND DOCUMENTATION

FOR YOUR 3COM SWITCH

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

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

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

CONTENTS

DOWNLOAD THE LATEST SOFTWARE AND DOCUMENTATION

FOR YOUR 3COM SWITCH

ABOUT THIS GUIDE

	Before You Start	9
	Release Notes	9
	About Your CD-ROM			9
	Conventions 10
	Related Documentation		11
	Accessing Online Documentation				11
	Documentation Comments			12
1 INTRODUCING THE SWITCH 4200G FAMILY
	About the Switch 4200G			14
	Summary of Hardware Features				14
	Switch 4200G—Front View Detail				15
	10/100/1000BASE-T Ports 16
	1000BASE-X SFP Ports			17
	Console Port	17
	Unit Status Display		17
	LEDs 18
	Switch 4200G — Rear View Detail				19
	Power Socket	19
	10 Gbps Interface Slots			19
	Default Settings	20

6 CONTENTS

2 INSTALLING THE SWITCH

	Package Contents		22
	Choosing a Suitable Site			22
	Rack-mounting	23
	Placing Units On Top of Each Other					25
	The Power-up Sequence			25
	Powering-up the Switch 4200G					25
	Checking for Correct Operation of LEDs							25
	SFP Operation	26
	Approved SFP Transceivers				26
	Inserting an SFP Transceiver				26
	Removing an SFP Transceiver				28
	Choosing the Correct Cables				28
	Choosing the Correct Cables for the Switch 4200G									29
3 SETTING UP FOR MANAGEMENT
	Methods of Managing a Switch				32
	Command Line Interface Management							32
	Command Line Interface Management using SSH									33
	Web Interface Management				33
	SNMP Management 33
	Setting Up Overview		34
	IP Configuration		36
	Preparing for Management				37
	Manually Configuring IP Information					37
	Connecting to the Console Port					38
	Connecting to a Front Panel Port					41
	Viewing Automatically Configured IP Information								44
	Using 3Com Network Director					44
	Connecting to the Console Port					45
	Setting Up Command Line Interface Management								46
	User Interface Overview			46
	CLI Management using the Console Port							46
	CLI Management over the Network						46
	Setting Up Command Line Interface Management using SSH 47
	Setting Up Web Interface Management						48

CONTENTS 7

	Prerequisites	48
	Web Management Over the Network					49
	Setting Up SNMP Management V1 or V2					50
	Prerequisites	50
	Default Users and Passwords			50
	Configuration Conversion Utility				51
4	PROBLEM SOLVING
	Solving Problems Indicated by LEDs				54
	Solving Hardware Problems			55
	Solving Communication Problems				57
5	UPGRADING SOFTWARE
	Upgrade methods		59
	Upgrading from the Command Line Interface 60
	Check Flash Space Available 60
	Backup Switch Software			61
	Upgrade Using TFTP		61

Upgrade Using FTP (via network port) 63

XModem (using the console cable)				65
Upgrading from the Bootrom Interface				66
Introduction		66
TFTP	68
FTP	68
XModem		69
Upgrading the Bootrom 70
Bootrom Upgrade using TFTP			71
Bootrom Upgrade using FTP			71
Bootrom Upgrade using XModem				72

8 CONTENTS

A	SAFETY INFORMATION
	Power Cord Set—Japan		76
	Important Safety Information			76
	L’information de Sécurité Importante				78
	Wichtige Sicherheitsinformationen 81
	Información de Seguridad Importante				82
	Importanti Informazioni di Sicurezza				84
	Ważne informacje o zabezpieczeniach				86
B	PIN-OUTS
	Null Modem Cable	89
	PC-AT Serial Cable	89
	Modem Cable 90
	Ethernet Port RJ-45 Pin Assignments				90
C	TECHNICAL SPECIFICATIONS
	Switch 4200G 12-Port		93
	Switch 4200G 24-Port		94
	Switch 4200G (48-Port)		95
D	OBTAINING SUPPORT FOR YOUR PRODUCT
	Register Your Product		97
	Purchase Value-Added Services			97
	Troubleshoot Online	98
	Access Software Downloads			98

Telephone Technical Support and Repair 98

Contact Us 99

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

This guide provides all the information you need to install and use the 3Com® Switch 4200G Family.

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

Before You Start This section contains information about the documents and CD-ROM that accompany your Switch 4200G.

Release Notes The Release Notes provide important information about the current software release, including new features, modifications, and known problems. You should read the Release Notes before installing the Switch in your network.

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

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

■Online documentation for the Switch 4200G—refer to Related Documentation on page 11 for details.

■A link to 3Com Network Director software.

■A number of other useful links.

Most user guides and Release Notes are available in Adobe Acrobat

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

World Wide Web site:

http://www.3com.com/

10 ABOUT THIS GUIDE

Conventions	Table 1 and Table 2 list conventions that are used throughout this guide.
	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 IP information, enter the following command:
				display ip interface br
	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
	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

11

Related	In addition to this guide, Switch 4200G documentation set includes the
Documentation	following:
	■ Switch 4200G Configuration 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.
	■ Switch 4200G Quick Reference Guide
	This guide contains:
	■ a list of the features supported by the Switch.
	■ a summary of the command line interface commands for the
	Switch. This guide is also available under the Help button on the
	web interface.
	■ Switch 4200G Command 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 PDF 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. The
	Release Notes are supplied in hard copy with your Switch.
Accessing Online To access the documentation on the CD-ROM supplied with your Switch,
Documentation	do the following:

1Insert 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 using the root directory and copy the files from the CD-ROM to a suitable directory.

■The PDF Command Reference Guide is stored in the Docs directory on the CD-ROM.

■The PDF Configuration Guide is stored in the Docs directory of the CD-ROM.

12 ABOUT THIS GUIDE

Documentation	Your suggestions are very important to us. They will help make our
Comments	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)
	■ Page number (if appropriate)
	Example:
	Part Number 10014914AA
	Switch 4200G Family Getting Started Guide
	Page 21
	Please note that we can only respond to comments and questions about
	3Com product documentation at this e-mail address. Questions related to
	technical support or sales should be directed in the first instance to your
	network supplier.

1	INTRODUCING THE
	SWITCH 4200G FAMILY

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

■About the Switch 4200G

■Switch 4200G—Front View Detail

■Switch 4200G — Rear View Detail

■Default Settings

14 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

About the Switch 4200G

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

■12, 24 or 48 10/100/1000BASE-T ports

■Four 1000BASE-X SFP ports

■One option module slot for a 10 Gigabit Ethernet port module on the Switch 4200G 12-Port. Requires an optional XFP.

■Two option module slots for a 10 Gigabit Ethernet port module on the Switch 4200G 24-Port and the Switch 4200G 48-Port. Requires an optional XFP.

■One RJ-45 connector for serial management

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

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

Summary of Table 3 summarizes the hardware features that are supported by the

Hardware Features Switch 4200G.

Table 3 Hardware Features

Feature	Switch 4200G
Addresses	Up to 8,000 supported
Auto-negotiation	Supported on all ports
Forwarding Modes	Store and Forward
Duplex Modes	Half and full duplex on all front panel ports
Auto MDI/MDIX	Supported on all ports. If fiber SFP transceivers are used,
	Auto MDIX is not supported.
Flow Control	In full duplex operation all ports are supported
Traffic Prioritization	Supported (using the IEEE Std 802.ID, 1998 Edition):
	Eight traffic queues per port
Ethernet, Fast	Auto-negotiating 10/100/1000BASE-T ports
Ethernet, and Gigabit
Ethernet Ports
SFP Ethernet Ports	Supports fiber Gigabit Ethernet long-wave (LX),
	long-haul (LH70) and copper (T) transceivers in any
	combination.

Switch 4200G—Front View Detail 15

Table 3 Hardware Features (continued)

Feature	Switch 4200G
Mounting	19-inch rack or standalone mounting
Clustering	Up to 16 units can be linked together (15 members and
	1 commander)

Switch 4200G—Front View

Detail	Figure 1 Switch 4200G 12-Port—front view
		Unit Status
		Display
Port Status LEDs	SFP Status Console		Power LED
	LEDs	Port
			PWR
		Mode	MOD 1
		Green=Speed
		Yellow=Duplex
			MOD 2
10/100/1000BASE-T
10/100/1000BASE-T Ports	Gigabit SFP Ports	Mode	Mode LED	10Gbps
		Switch		Interface Slot

LEDs

Figure 2 Switch 4200G 24-Port—front view

Unit Status

Display

Port Status LEDs	SFP Status	Console	Power LED
	LEDs	Port

Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps	Duplex: Green = Full Duplex, Yellow = Half Duplex	Power: Green = Delivering Power, Yellow = Fault, Flashing Green = Over Budget
		25	26	27/25	28/26	PWR
					Mode	MOD 1
					Green=Speed
					Yellow=Duplex
						MOD 2
	10/100/1000BASE-T

10/100/1000BASE-T Ports	Gigabit SFP Ports	Mode	Mode LED	10Gbps
		Switch		Interface Slot
				LEDs

16 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

Figure 3 Switch 4200G 48-Port—front view

			Unit Status
				Display
							Mode
	Console Port						Switch
Port Status LEDs							Mode	Power
							LED	LED

Speed:Green = 100Mbps, Yellow = 10Mbps	Duplex:Green = Full Duplex, Yellow = Half Duplex	Power:Green = Deliverng Power. Yellow=Fault, Flashing Green=Over Budget		Mode
				Green=Speed
				Yellow=Duplex
		49	50	51/49	52/50
					PWR
					MOD1
					MOD1

10/100/1000BASE-T Ports	Gigabit SFP	10Gbps
	Ports	Interface Slot
		LEDs

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

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

10/100/1000BASE-T The Switch 4200G has 12, 24 or 48 auto-negotiating

Ports 10BASE-T/100BASE-TX ports configured as Auto MDIX (crossover). When auto-negotiation is enabled these ports automatically operate in MDI or MDIX mode as needed. These ports provide 10/100/1000 Mbps full-duplex connections to other Gigabit Ethernet devices. Full-duplex allows packets to be transmitted and received simultaneously which effectively doubles the potential throughput of a link.

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

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

Switch 4200G—Front View Detail 17

1000BASE-X SFP Ports SFP (Small Form Factor Pluggable) ports support fiber Gigabit Ethernet long-wave (LX), long-haul (LH70) and copper (T) SFP Transceivers in any combination. This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high capacity aggregated link backbone connection.

The default state for these ports is auto-negotiation enabled, where the speed, duplex and flow control modes are negotiated. As the speed and duplex modes are fixed by the media type, only the flow control is negotiated with the link partner. Alternatively, auto-negotiation can be disabled (except 1000BASE-T which auto-negotiation is mandatory) and the flow control setting can be manually configured.

Console Port The console port allows you to connect a terminal and perform remote or local out-of-band management. As the console port on the Switch is an RJ-45 port, you will need to connect an RJ-45 to DB9 converter cable to a standard null modem cable in order to connect a terminal.

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

Table 4 Status Display

Display	Mode LED Color	Description
Digit (1–9)	Mode LED flashing green	POST (power-on startup tests) running.
Digit (0–8)	Mode LED flashing red	POST failure. Digit indicates ID of failed test.
		0	POST test OK
		1	CPU error
		2	Switch chip error
		3	RAM error
		4	Flash error
		5	Port error
		6	PHY error
		7	Packet memory error
		8	CPLD error

18 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

Table 4 Status Display (continued)

Display	Mode LED Color	Description
Rotating bar segment	Mode LED flashing green	Software download in progress.
Flashing “F”	Mode LED steady red	Fan failure detected.
Flashing “t”	Mode LED flashing red	Switch is too hot; temperature is critical.
“C”	Mode LED green or yellow	Switch is clustered Commander unit.
“c”	Mode LED green or yellow	Switch is clustered Candidate unit.
“S”	Mode LED green or yellow	Switch is clustered Slave unit.
“1”	Mode LED green or yellow	Switch is un-clustered.

LEDs Table 5 lists LEDs visible on the front of the Switch, and how to read their status. For information on using the LEDs for problem solving, see “Solving Problems Indicated by LEDs” on page 54.

Table 5 LED Behavior

LED	Color	Indicates
PWR LED
	Green	The Switch is powered-up and operating normally.
	Green flashing	Self Test (POST) or Software Download is in progress.
	Yellow flashing	One or more ports have failed POST.
	Red	The Switch has failed its Power On Self Test.
	Off	The Switch is not receiving power or there is a fault with the
		Power Supply Unit.
Mode LED
Speed	Green	10/100 Port Speed and Activity, Gigabit SFP Status and
		Activity, or Stack Status and Activity.
Duplex Yellow		10/100 Duplex and Activity, Gigabit SFP Duplex and
		Activity, or Stack Activity.
10/100/1000BASE-T Port LEDs
Speed	Green	A high speed (1000 Mbps) link is present, blinking off for
		every packet received or transmitted.
	Yellow	A low speed link is present, blinking off for every packet
		received or transmitted.
	Yellow Flashing	The port has failed POST.
	Off	No link is present.

Switch 4200G — Rear View Detail 19

Table 5 LED Behavior (continued)

LED	Color	Indicates
Duplex Green		Full duplex, blinking off for every packet received or
		transmitted.
	Yellow	Half duplex, blinking off for every packet received or
		transmitted.
	Yellow flashing	The port has failed POST.
	Off	No link is present.
1000BASE-X Port SFP Port LEDs
Speed	Green	A high speed (1000 Mbps) link is present.
	Yellow Flashing	Port failed POST.
	Off	No link is present.
Duplex Green		Full duplex packets are being transmitted/received on the
		port.
	Yellow	Half duplex packets are being transmitted/received on the
		port.
	Yellow flashing	Port failed POST.
	Off	No link is present.

Switch 4200G — Figure 4 Switch 4200G—rear view

Rear View Detail

MOD 1

MOD 2

AC Power Input				10Gbps Interface		10Gbps Interface
				Slot 1		Slot 2

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

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

Slots

20 CHAPTER 1: INTRODUCING THE SWITCH 4200G FAMILY

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

Table 6 Default Settings

Feature	Switch 4200G
Automatic IP Configuration	Enabled
Port Status	Enabled
Port Speed	Auto-negotiated
Duplex Mode	Auto-negotiated
Flow Control	Auto-negotiated
Broadcast Storm Control	Enabled
Virtual LANs (VLANs)	All ports belong to the untagged Default VLAN
	(VLAN 1) with IEEE Std 802.1Q-1998 learning
	operational
Management VLAN	Fixed as VLAN 1 on 4200G units. Can be any
	VLAN for 4200G units.
Link Aggregation Control	Disabled per port
Protocol (LACP)
IP Multicast Filtering	Filtering enabled
Rapid Spanning Tree Protocol	Enabled
Fast Start	Enabled on front panel ports
RMON Alarm	Enabled
Traffic Prioritization	All ports prioritize NBX VoIP traffic (LAN and IP).
	All ports set to “best effort” for all other traffic.
Port Security	Disabled per port
Configuration Save and	Disabled
Restore

2	INSTALLING THE SWITCH

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

Switch 4200G. It covers the following topics:

■Package Contents

■Choosing a Suitable Site

■Rack-mounting

■Placing Units On Top of Each Other

■The Power-up Sequence

■SFP Operation

■Choosing the Correct Cables

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

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

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

ADVERTENCIA: Información de seguridad. Antes de instalar o extraer cualquier componente del Switch 4200G o de realizar tareas de mantenimiento, debe leer la información de seguridad facilitada en el Apéndice A de esta guía del usuario.

22 CHAPTER 2: INSTALLING THE SWITCH

AVVERTENZA: Informazioni di sicurezza. Prima di installare o rimuovere qualsiasi componente dal Switch 4200G o di eseguire qualsiasi procedura di manutenzione, leggere le informazioni di sicurezza riportate nell'Appendice A della presente guida per l'utente.

OSTRZEŻENIE: Informacje o zabezpieczeniach. Przed instalacją lub usunięciem jakichkolwiek elementów z product lub przeprowadzeniem prac konserwacyjnych należy zapoznać się z informacjami o bezpieczeństwie zawartymi w Załączniku A niniejszego podręcznika.

Package Contents	■	Switch unit
	■ CD-ROM (includes documentation related to your Switch)
	■ Getting Started Guide (this guide)
	■	Release Notes
	■	Unit Information Labels
	■	Warranty Information
	■	Power Cord
	■ Console Cable (RJ-45)
	■ 2 x Mounting brackets
	■	4 x Screws
	■ 4 x Rubber feet
Choosing a Suitable	The Switch is suited for use either free standing on a desktop, or
Site	mounted in a standard 19-inch equipment rack (for example, in a wiring
	closet or equipment room). A rack-mounting kit containing two
	mounting brackets is supplied with the Switch.

CAUTION: Ensure that the ventilation holes are not obstructed.

When deciding where to position the Switch, ensure that:

■Cabling is located away from:

■sources of electrical noise such as radios, transmitters and broadband amplifiers.

■power lines and fluorescent lighting fixtures

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

Rack-mounting 23

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

■ Air flow is not restricted around the Switch or through the vents in the side of the Switch. 3Com recommends that you provide a minimum of 25mm (1in.) clearance.

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

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

■ The air is as free from dust as possible.

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

■ No more than four Switch units are placed on top of one another, if the units are free-standing.

	■ The Switch is situated away from sources of conductive (electrical)
	dust, for example laser printers.
	■ The AC supply used by the Switch is separate to that used by units
	that generate high levels of AC noise, for example air conditioning
	units and laser printers.
Rack-mounting	The Switch 4200G is 1 rack unit (1U) high and will fit in most standard
	19-inch racks.
	CAUTION: Disconnect all cables from the Switch before continuing.
	Remove all self adhesive pads from the underside of the Switch if they
	have been fitted.
	To rack-mount your Switch:
	1 Place the Switch the right way up on a hard flat surface, with the front
	facing towards you.
	2 Locate a mounting bracket over the mounting holes on one side of the
	front of the Switch, as shown in Figure 5.

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

24 CHAPTER 2: INSTALLING THE SWITCH

Figure 5 Fitting a Bracket for Rack-Mounting

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 step 2 and step 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:

■3Com product name of the Switch

■3Com 3C number of the Switch

■Unique MAC address (Ethernet address) of the Switch

■Serial number of the Switch

You may need this information if you contact 3Com Technical Support.

Placing Units On Top of Each Other 25

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

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

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

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

Switch 4200G

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 one minute.

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

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

Table 7 PWR LED Colors

Color	State
Green	The Switch is powered-up and operating normally.
Red	The Switch has failed its Power On Self Test (POST).
Yellow flashing	Some ports have failed POST*
Off	The Switch is not receiving power.

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

26 CHAPTER 2: INSTALLING THE SWITCH

	If there is evidence of a problem, see “Solving Problems Indicated by
	LEDs” on page 54 for a list of suggested solutions.
	CAUTION: The Switch has no ON/OFF switch; the only method of
	connecting or disconnecting mains power is by connecting or
	disconnecting the power cord.
SFP Operation	The following section describes how to insert an SFP transceiver into an
	SFP port.
	SFP transceivers are hot-insertable and hot-swappable. You can remove
	them from and insert them into any SFP port without having to power
	down the Switch.

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

■3CSFP92 SFP (1000BASE-LX)

■3CSFP97 SFP (1000BASE-LH70)

■3CSFP93 SFP (1000BASE-T)

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

http://www.3com.com

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

■1000BASE-LX SFP transceiver

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

■1000BASE-LH70 SFP transceiver

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

SFP Operation 27

■1000BASE-T SFP transceiver

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

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

“Solving Hardware Problems” on page 55.

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

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

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

3Gently 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.

4Remove the plastic protective cover if fitted.

Figure 6 Inserting an SFP Transceiver

Product label

Suitable port on host Switch

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

6Check the LEDs on the front of the Switch to ensure that it is operating correctly. Refer to “LEDs” on page 18 for more information.

28 CHAPTER 2: INSTALLING THE SWITCH

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

1Disconnect the cable from the transceiver.

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

3Pull the wire release lever toward you to release the catch mechanism; the transceiver will then easily slide out.

Choosing the	All of the ports on the Switch are Auto-MDIX, that is they have a
Correct Cables	cross-over capability. These ports can automatically detect whether to
	operate in MDI or MDIX mode. Therefore you can make a connection to
	one of the ports with a straight-through (MDI) or a cross-over cable
	(MDIX).
	The Auto-MDIX feature only operates when auto-negotiation is enabled.
	If auto-negotiation is disabled, all the Switch ports are configured as
	MDIX (cross-over). If you want to make a connection to another MDIX
	port, you need a cross-over cable. Many ports on workstations and
	servers are configured as MDI (straight-through). If you want to make a
	connection to an MDI port, you need to use a standard straight-through
	cable. See Table 8.
	3Com recommends that you use at least Category 5 twisted pair
	cable—the maximum segment length for this type of cable is 100 m (328
	ft.).

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

Cross-over Cable

Straight-through Cable

Switch to Switch (MDIX to MDIX)

Switch to Hub (MDIX to MDIX)

Switch to PC (NIC) (MDIX to MDI)

Choosing the Correct Cables

29

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

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

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

Choosing the Correct All of the ports on the front of the Switch 4200G 28-Port are Cables for the 100BASE-FX MT-RJ multi-mode ports. The MT-RJ port is a small form

Switch 4200G factor fiber-optic port with the transmit and receive fibers in the same cable. Unlike many fiber-optic systems, only one MT-RJ cable is needed to connect two MT-RJ ports together.

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

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

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

30 CHAPTER 2: INSTALLING THE SWITCH