3com SuperStack II 3900 User manual

®

http://www.3com.com/

SuperStack

®

II Switch 3900

Getting Started Guide

Part No. 10005622

Published April 1998

3Com Corporation

■

5400 Bayfront Plaza

■

Santa Clara, California

■

95052-8145

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 of any kind,

either implied or expressed, including, but not limited to, the implied

warranties of merchantability 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.

UNITED STATES GOVERNMENT LEGENDS

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.

EMISSIONS COMPLIANCE STATEMENTS FOR CLASS A PRODUCTS

United States — Federal Communications Commission Notice

This equipment has been tested and found to comply with the limits for a

Class A digital device, pursuant to Part 15 of the FCC Rules. These limits

are designed to provide responsible protection against harmful

interference when the equipment is operated in a commercial environment.

This equipment generates, uses, and can radiate radio frequency energy

and, if not installed and used in accordance with the instruction manual,

may cause harmful interference to radio communications. Operation of this

equipment in a residential area is likely to cause harmful interference, in

which case the user will be required to correct the interference at his or her

own expense.

Canada — Emissions Requirements

This Class A digital apparatus meets all requirements of the Canadian

Interference-Causing Equipment Regulations.

Cet appareil numérique de la classe A respecte toutes les exigences du

Règlement sur le matériel brouilleur du Canada.

Japan — VCCI Class A Compliance

This is a Class A product based on the standard of the Voluntary Control

Council for Interference by Information Technology Equipment (VCCI). If

this equipment is used in a domestic environment, radio disturbance may

arise. When such trouble occurs, the user may be required to take

corrective actions.

EMC DIRECTIVE COMPLIANCE

This equipment was tested and found to conform to the Council Directive

89/336/EEC for electromagnetic compatibility. Conformity with this

Directive is based upon compliance with the following harmonized

standards:

EN 55022 Limits and Methods of Measurement of Radio Interference

EN 50082-1 Electromagnetic Compatibility Generic Immunity Standard:

Residential, Commercial, and Light Industry

Warning

:

This is a Class A product. In a domestic environment, this

product may cause radio interference, in which case you may be required

to take adequate measures.

LOW VOLTAGE DIRECTIVE COMPLIANCE

This equipment was tested and found to conform to the Council Directive

72/23/EEC for safety of electrical equipment. Conformity with this Directive

is based upon compliance with the following harmonized standard:

EN 60950 Safety of Information Technology Equipment

UK GENERAL APPROVAL STATEMENT

This equipment is manufactured to the international Safety Standard

EN60950 and is approved in the UK under the General Approval Number

NS/G/12345/J/100003 for indirect connection to the public

telecommunication network.

AUSTRALIAN EMC FRAMEWORKS COMPLIANCE

This product conforms to the EMC Frameworks and meets the Class A

limits of AS3548.

TRADEMARKS

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, SuperStack, and Transcend are registered

trademarks of 3Com Corporation. 3ComFacts is a service mark of 3Com

Corporation.

IBM and NetView AIX are registered trademarks of International Business

Machines Corporation. Apple, AppleTalk, and Macintosh are trademarks of

Apple Computer, Inc. Ultrajet is a trademark of Chemtronics. CompuServe

is a registered trademark of CompuServe, Inc. MS-DOS and Windows are

registered trademarks of Microsoft Corporation. HP and OpenView are

registered trademarks of Hewlett-Packard Co. SunNet Manager, SunOS,

and OpenWindows are trademarks of Sun Microsystems, Inc. Microswabs

and Texwipe are registered trademarks of Texwipe. Liqui-Tool is a trademark

of Triangle Tool Group. UNIX is a registered trademark in the United States

and other countries, licensed exclusively through X/Open Company.

All other company and product names may be trademarks of the respective

companies with which they are associated.

C

ONTENTS

A

BOUT

T

HIS

G

UIDE

Introduction 1

Finding Speciﬁc Information in This Guide 1

Conventions 2

SuperStack II Switch 3900 Documentation 3

Paper Documents 3

Documents on CD-ROM 4

Related Publications 4

Documentation Comments 4

Year 2000 Compliance 5

1

S

WITCH

3900 S

YSTEM

AND

S

ETUP

O

VERVIEW

Switch 3900 Intelligent Switch 1-1

System Overview — 24-Port Front Panel 1-2

System Overview — 36-Port Front Panel 1-3

System Overview — Back Panel of Both Models 1-4

System Features and Beneﬁts 1-5

System Management 1-5

Optional Gigabit Ethernet Modules 1-6

Network Conﬁguration Example 1-6

Providing Dedicated Links for Fast Ethernet 1-6

Network Conﬁguration Sample 1-7

2

I

NSTALLING

THE

S

YSTEM

Before You Begin 2-1

Installing the System on a Table Top or in a Free-Standing

Stack 2-2

Installing the System in a Distribution Rack 2-3

Preparing the System and Rack 2-3

Mounting the System into a Distribution Rack 2-5

3

C

ABLING

S

WITCH

3900 P

ORTS

Overview of Cabling 3-1

Fiber Safety Precautions 3-1

Fast Ethernet Ports 3-2

Cabling 10/100BASE-TX (RJ-45) Ports 3-2

10/100BASE-TX (RJ-45) Connector Pin Assignments 3-3

Gigabit Ethernet Ports 3-4

Cabling Gigabit Ethernet Ports 3-4

Cabling the Console Port 3-5

Console Port Pin Assignments 3-7

4

S

YSTEM

P

OWER

U

P

Power Options 4-1

AC Power Cord 4-1

Optional Advanced Redundant Power System 4-1

Optional Uninterruptible Power System 4-1

Power Up 4-2

To Power the Switch 3900 with the RPS 4-2

To Power the Switch 3900 from the Wall

Receptacle 4-2

Power-up Diagnostics 4-2

System Diagnostics 4-3

Power LED Activity 4-3

Fault LED Activity 4-3

Ethernet Port Diagnostics 4-3

Packet LED Activity 4-3

Status LED Activity 4-3

System and Port Status LEDs 4-4

System Checks 4-5

Next Step: Software Conﬁguration 4-5

5

Q

UICK

S

ETUP

FOR

M

ANAGEMENT

A

CCESS

About Switch 3900 System Management 5-1

How Do You Want to Manage the System? 5-1

Terminal Connection 5-2

Modem Connection 5-2

IP Management Interface 5-2

Initial Management Access 5-2

Setting the Console Port Baud 5-3

Conﬁguring the IP Interface 5-3

6

T

ROUBLESHOOTING

THE

S

YSTEM

Getting Additional Help 6-1

Diagnosing Problems 6-1

Power Failures 6-1

Abnormal LED Activity 6-1

Cleaning Dirty Fiber Optic Ports and Connectors 6-4

A

S

YSTEM

S

PECIFICATIONS

B

S

ITE

R

EQUIREMENTS

AND

S

AFETY

C

ODES

General Safety Requirements B-1

Wiring Closet Recommendations B-1

Distribution Rack Requirements B-2

Protective Grounding for the Rack B-2

Space Requirements for the Rack B-2

Mechanical Requirements for the Rack B-3

Building and Electrical Codes B-4

Building Codes B-4

Electrical Codes B-5

C

T

ECHNICAL

S

UPPORT

Online Technical Services C-1

World Wide Web Site C-1

3Com FTP Site C-1

3Com Bulletin Board Service C-1

Access by Analog Modem C-2

Access by Digital Modem C-2

3ComFacts Automated Fax Service C-2

Support from Your Network Supplier C-2

Support from 3Com C-3

Returning Products for Repair C-4

INDEX

3C

OM

C

ORPORATION

L

IMITED

W

ARRANTY

A

BOUT

T

HIS

G

UIDE

Introduction

Your

SuperStack II Switch 3900 Getting Started Guide

provides all the information that you need to set up

your SuperStack

®

II Switch 3900 system and get it

operating in your network. This guide provides an

overview of your system and step-by-step procedures

for planning your conﬁguration, installing your

system, cabling, powering up, conﬁguring, and

troubleshooting. When you are ready to conﬁgure

your SuperStack II Switch 3900 system, see the

Administration Guide

on the Documentation CD.

If the information in the Software Installation and

Release Notes that are shipped with your Switch 3900

system differs from the information in this guide,

follow the instructions in the Release Notes.

This guide is intended for the system or network

administrator who is responsible for installing and

managing network hardware. It assumes that you

have a working knowledge of local area network

(LAN) operations, but it does not assume prior

knowledge of 3Com’s Switch 3900 high-performance

networking equipment.

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

Finding Speciﬁc Information in This Guide

This table shows where to ﬁnd speciﬁc information.

For information on Turn to

Best ways to use the Switch

3900 system

“System Features and Beneﬁts”

on page 1-5

The front and back panels “System Overview — 24-Port

Front Panel” starting on page 1-2

Site requirements and other

issues to consider before

installing your Switch 3900

system

“General Safety Requirements” on

page B-1

Installing the system on a table

or in a distribution rack

“Installing the System on a Table

Top or in a Free-Standing Stack”

starting on page 2-2 and

“Installing the System in a

Distribution Rack” on page 2-3

Cabling rules and pin

assignments:

■

Fast Ethernet ports “Fast Ethernet Ports” on page 3-2

■

Gigabit Ethernet ports “Gigabit Ethernet Ports” on

page 3-4

■

Console port “Cabling the Console Port” on

page 3-5 and “Console Port Pin

Assignments” on page 3-7

Checking system power-up

diagnostics and LEDs

“Power Up” on page 4-2

(continued)

2

A

BOUT

T

HIS

G

UIDE

Conventions

Table 1 and Table 2 list conventions that are used

throughout this guide.

Deciding how to manage your

system

“How Do You Want to Manage

the System?” on page 5-1

Setting the Console port baud “Setting the Console Port Baud”

on page 5-3

Conﬁguring the IP management

interface

“Conﬁguring the IP Interface” on

page 5-3

Troubleshooting hardware and

software problems

“Diagnosing Problems” on

page 6-1

Complying with environmental

and compliance speciﬁcations

Appendix A: System Speciﬁcations

Checking your site for

environmental and safety

considerations

Appendix B: Site Requirements

and Safety Codes

Getting help from your network

supplier or 3Com

Appendix C: Technical Support

Table 1

Notice Icons

Icon Type Description

Information

Note

Information that describes important

features or instructions

Caution Information that alerts you to potential loss

of data or damage to an application,

system, or device

Warning Information that alerts you to potential

personal injury

For information on Turn to

Table 2

Text Conventions

Convention Description

Screen

displays

This typeface represents information as it

appears on the screen.

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 update the system software, enter the

following command:

system softwareUpdate

This guide always gives the full form of a

command in uppercase and lowercase letters.

However, you can abbreviate commands by

entering the fewest letters in each command

that identify a unique command. Commands

are not case sensitive.

The words

“enter”

and “type”

When you see the word “enter” in this guide,

you must type something, and then press Return

or Enter. Do not press Return or Enter when an

instruction simply says “type.”

Keyboard key

names

If you must press two or more keys

simultaneously, the key names are linked with a

plus sign (+). Example:

Press Ctrl+Alt+Del

Words in

italics

Italics are used to:

■

Emphasize a point.

■

Denote a new term at the place where it is

defined in the text.

■

Identify menu names, menu commands, and

software button names. Examples:

From the

Help

menu, select

Contents

.

Click

OK

.

SuperStack II Switch 3900 Documentation

3

SuperStack II Switch 3900 Documentation

The following documents comprise the SuperStack II

Switch 3900 documentation set. Documents are

shipped with your system in one of two forms:

■

Paper documents that are shipped with your

system or with optional components. They are

listed in the next section.

■

SuperStack II 3900 and 9300 Documentation CD

with online versions of the paper documents

To order a paper copy of a document that you see on

the compact disc, or to order additional compact

discs, contact your sales representative.

Paper Documents

These documents are shipped with your SuperStack II

Switch 3900 system:

■

SuperStack II Switch 3900 and 9300 Unpacking

Instructions

How to unpack your Switch 3900 system. Also, an

inventory list of items that are shipped with your

system.

■

SuperStack II Switch 3900 and 9300 Software

Installation and Release Notes

All of the new features, system issues, known

problems, and software corrections for the

software release. It also describes any changes to

the Switch 3900 system’s documentation.

■

SuperStack II Switch 3900 and 9300 Quick

Installation Guide

How to perform a quick installation of your

system. For more details on installation, see the

SuperStack II Switch 3900 Getting Started Guide

.

■

SuperStack II Switch 3900 Getting Started Guide

All the procedures necessary for getting your

system up and running, including information on

installing, cabling, powering up, conﬁguring, and

troubleshooting the system.

■

SuperStack II Switch 3900 and 9300 Command

Quick Reference Card

All of the Administration Console switching

commands for the Switch 3900. For complete

descriptions, see the

Administration Guide

.

These documents are shipped with optional devices:

■

1000BASE-SX/1000BASE-LX Gigabit Ethernet

Module Installation Guide

How to install the optional Gigabit Ethernet

module.

■

SuperStack II Switch Advanced RPS User Guide

How to install the Advanced Redundant Power

Supply (RPS) and how to use it to provide

redundant and resilient power supplies for the

Switch 3900.

■

SuperStack II Switch Advanced RPS ‘Y’ Cable

Type 2 User Guide

How to install the Y cable with the Advanced

Redundant Power Supply (RPS) to provide fully

redundant capabilities.

4

A

BOUT

T

HIS

G

UIDE

Documents on CD-ROM

The compact disc that comes with your system

contains these documents:

■

Online versions of the paper documents that are

shipped with your system and its components

■

SuperStack II Switch 3900 and 9300

Administration Guide

How to use the Administration Console and the

management tasks that you can perform using it.

Related Publications

Depending on how you install and manage your

system, several related documents can provide helpful

information:

■

SNMP Network Manager documents

The Switch 3900 uses SNMP (Simple Network

Management Protocol), which can be accessed by

a remote network management application. 3Com

has network management applications for a

variety of platforms. Contact your supplier for

current product information. Each network

management application includes a guide that

explains how to manage your system.

If you are using network management software

from another vendor, refer to the sections of the

product’s documentation that describe how to

manage SNMP devices.

■

SNMP documents

3Com recommends these books for easy-to-read

descriptions of SNMP:

■

Marshall T. Rose.

The Simple Book: An

Introduction to Networking Management.

Englewood Cliffs, NJ: Prentice-Hall; 1996.

■ “Introduction to SNMP” Self-Study Guide.

Order from 3Com: Part Number 3CS-350A.

■ Telnet documents

To manage the Switch 3900 system over a TCP/IP

network using telnet, see the documentation that

is supplied with your telnet application.

Documentation Comments

Your suggestions are very important to us. They help

us make our documentation more useful to you.

Please send e-mail comments about this guide to:

[email protected]

Please include the following information when

commenting:

■ Document title

■ Document part number (found on front or back

page of document)

■ Page number (if appropriate)

Example:

SuperStack II Switch 3900 Getting Started Guide

Part Number 10005622

Page 2-5 (chapter 2, page 5)

Year 2000 Compliance 5

Year 2000 Compliance

For information on Year 2000 compliance and 3Com

products, visit the 3Com Year 2000 Web page:

http://www.3com.com/products/yr2000.html

1

SWITCH 3900 SYSTEM AND SETUP OVERVIEW

This chapter contains:

■ An overview of 3Com’s SuperStack

®

II Switch 3900

and how it provides solutions for your network

■ A description of the major features and

components of the system

■ A network conﬁguration example

Switch 3900 Intelligent Switch

The Switch 3900 is the ideal product for network

managers who want to migrate from existing

switched 10 Mb networks to switched 100 Mb or

who need to deliver faster access to servers.

The Switch 3900 provides superior workgroup and

departmental switching performance with the added

ﬂexibility of multiple Gigabit Ethernet links and server

connections.

The SuperStack II Switch 3900 family delivers full line

rate, nonblocking switching between 10/100 Mb

links and 1000 Mb Gigabit Ethernet links.

The Switch 3900 family consists of two models:

■ 3C39024 — The 24-port 10/100BASE-TX switch,

with up to three Gigabit Ethernet links. See

Figure 1-1.

■ 3C39036 — The 36-port 10/100BASE-TX switch,

with up to three Gigabit Ethernet links. See

Figure 1-2.

Both versions of the Switch 3900 provide:

■ One built-in Gigabit Ethernet multimode ﬁber

(MMF) link (1000BASE-SX)

■ Expansion slots on the back panel (see Figure 1-3)

that can hold one or two of these optional Gigabit

Ethernet modules:

■ Model 3C39001 — 1000BASE-SX for

multimode ﬁber (MMF)

■ Model 3C39002 — 1000BASE-LX for

single-mode ﬁber (SMF)

The cables for all Gigabit Ethernet ports use laser

transmission and have SC connectors.

See “Optional Gigabit Ethernet Modules” on

page 1-6 for more information.

1-2 CHAPTER 1: SWITCH 3900 SYSTEM AND SETUP OVERVIEW

System Overview — 24-Port Front Panel

Figure 1-1 Front Panel of the 24-Port SuperStack II Switch 3900

Ethernet Ports

Provide 24 10/100BASE-TX

(RJ-45) Ethernet ports

System and Port LEDs

Provide information about

the system and each port

14

15

16

17

13 18 19

20

21 22 23 24

14

15

16

17

13 18 19

20

21 22 23

10

106 7

8

9

Status

1x

6x

12x

7x

13x

18x

24x

19x

green = enabled, link OK

flashing green = disabled, link OK

off = link fail

Power Fault

10/100 BASE - TX

2

31

11 124

5

6 7

8

9

2

31

11 124

5

24

Pckt

Stat

Pckt

Stat

Super Stack II Switch 3900

System Overview — 36-Port Front Panel 1-3

System Overview — 36-Port Front Panel

v

Figure 1-2 Front Panel of the 36-Port SuperStack II Switch 3900

Status

1x

6x

12x

7x

13x

18x

24x

19x

25x

30x

36x

31x

green = enabled, link OK

flashing green = disabled, link OK

off = link fail

Power Fault

10/100 BASE - TX

Pckt

Stat

Pckt

Stat

Pckt

Stat

2

31 10 11 124

5

6 7

8

9

2

31 10 11 124

5

6 7

8

9

14

15

16

17

13 18 19

20

21 22 23 24

14

15

16

17

13 18 19

20

21 22 23 24

26

27

28

29

25 30 31

32

33 34 35 36

26

27

28

29

25 30 31

32

33 34 35 36

Super Stack II Switch 3900

Ethernet Ports

Provide 36 10/100BASE-TX

(RJ-45) Ethernet ports

System and Port LEDs

Provide information about

the system and each port

1-4 CHAPTER 1: SWITCH 3900 SYSTEM AND SETUP OVERVIEW

System Overview — Back Panel of Both Models

Figure 1-3 Back Panel of the 24-Port and 36-Port SuperStack II Switch 3900

Power Receptacle

Console Port

Allows you to connect a workstation or modem to

the Switch 3900 system for management access

1000 Base SX

Pckt

Stat

Console

RPS Connector

Connects to the Optional

Redundant Power System

Optional Gigabit Ethernet Slots

Allow you to add additional

Gigabit Ethernet modules

Fixed Gigabit Ethernet Port

Provides a 1000BASE-SX link

Gigabit Ethernet Port LEDs

Provide information on the

port status and activity

System Features and Beneﬁts 1-5

System Features and Beneﬁts

The Switch 3900 is part of 3Com’s SuperStack family.

To combine diverse technologies as your network

grows, install the Switch 3900 in a SuperStack

network.

Some key features of the SuperStack II Switch 3900

system:

■ High-density Gigabit Ethernet and Fast Ethernet

conﬁgurations

The Switch 3900 has 24 or 36 Fast Ethernet ports

and up to three Gigabit Ethernet links.

■ Autonegotiation support

The Switch 3900 supports 10BASE-T/100BASE-TX

and full-duplex and half-duplex autonegotiation

on all front panel ports.

■ Multiple-link trunking for Gigabit Ethernet and

Fast Ethernet links

You can choose the performance level of links

between switches, even scaling beyond one

Gigabit.

■ IGMP Snooping

The Switch 3900 conserves the network

bandwidth that is consumed by audio and video

applications by keeping IP multicast trafﬁc isolated

to speciﬁc ports.

■ Trunking links, Spanning Tree, and Advanced

Redundant Power Supply (RPS) support

The Switch 3900 protects against cable and

equipment failures with Spanning Tree Protocol

and trunking links. The optional RPS protects

against power interruptions for fault-tolerant

networks.

■ Manageability

The Switch 3900 provides full support for VLANs,

Fast IP, and RMON Version 1, as well as a roving

analysis port through SNMP management.

System Management

Switch 3900 systems include integrated management

to provide fault tolerance and maximum network

availability. This management is accessible in two

ways:

■ Switch 3900 Administration Console

■ Standard network managers based on SNMP, such

as 3Com’s Transcendware, Sun’s SunNet Manager,

HP OpenView, and IBM’s NetView AIX applications

1-6 CHAPTER 1: SWITCH 3900 SYSTEM AND SETUP OVERVIEW

Optional Gigabit Ethernet Modules

The Switch 3900 back panel has two expansion slots

that can hold optional Gigabit Ethernet modules.

These modules are available in the following

conﬁgurations:

■ 1000BASE-SX Module — Multimode ﬁber with

paired SC connectors. It supports links of up to

260 meters (852 feet) over 62.5-micron multimode

ﬁber or up to 525 meters (1722 feet) over

50-micron multimode ﬁber.

■ 1000BASE-LX Module — Single-mode ﬁber with

paired SC connectors. It supports links of up to 3.0

kilometers (1.86 miles) over 8-micron to 10-micron

single-mode ﬁber.

The modules have the same physical conﬁguration

and are installed in the same way.

For more information about installing and using the

optional Gigabit Ethernet modules, see the

1000BASE-SX/1000BASE-LX Gigabit Ethernet Module

Installation Guide that is on the Documentation CD

and shipped with either module.

Network Conﬁguration Example

This section describes one way to place the Switch

3900 in your network to alleviate trafﬁc congestion.

Providing Dedicated Links for Fast Ethernet

The rapid deployment of Fast Ethernet has increased

bandwidth demand many times over, not only by

supporting 100 Mb connections on the network but

also by placing demands on the servers to manage

the trafﬁc coming through those connections.

Figure 1-4 shows how the Switch 3900 provides

direct 100 Mb links to devices on the network

through its Fast Ethernet ports and up to three

dedicated Gigabit links to your network’s servers.

In this sample conﬁguration, the Switch 3900 can

provide up to 36 clients on your network with a

dedicated 100 Mb link and can multiplex the client

trafﬁc for Gigabit-speed access to the servers. (You

can use one port on the Switch 3900 for in-band

management as well as for network trafﬁc.)

Network Conﬁguration Sample 1-7

Network Conﬁguration Sample

Figure 1-4 SuperStack II Switch 3900 Provides Dedicated Fast Ethernet Links

36-Port SuperStack

®

II Switch 3900

Switched Gigabit

server farm

Switched 100 Mb

desktop systems

Status

1x

6x

12x

7x

13x

18x

24x

19x

25x

30x

36x

31x

green = enabled, link OK

flashing green = disabled, link OK

off = link fail

FaultPower

10/100 BASE - TX

2

31 10

11 124

5

6 7

8

9

2

31 10

11 124

5

6 7

8

9

14

15

16

17

13 18 19

20

21 22

23 24

14

15

16

17

13 18 19

20

21 22

23 24

26

27

28

29

25 30 31

32

33 34

35 36

26

27

28

29

25 30 31

32

33 34

35 36

Pckt

Stat

Pckt

Stat

Pckt

Stat

Super Stack II Switch 3900

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3com SuperStack II 3900 User manual

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