3com 3C17300 User manual

Category
Network switches
Type
User manual

This manual is also suitable for

http://www.3com.com/
Part No. DUA1730-0AAA02
Published October 2002
SuperStack
®
3
Switch 4200 Series
Getting Started Guide
3C17300
3C17302
3C17304
DUA1730-0AAA02.book Page 1 Thursday, January 23, 2003 12:28 PM
3Com Corporation
5400 Bayfront Plaza
Santa Clara, California
95052-8145
Copyright © 2002, 3Com Technologies. All rights reserved. No part of this documentation may be reproduced
in any form or by any means or used to make any derivative work (such as translation, transformation, or
adaptation) without written permission from 3Com Technologies.
3Com Technologies reserves the right to revise this documentation and to make changes in content from time
to time without obligation on the part of 3Com Technologies to provide notification of such revision or
change.
3Com Technologies provides this documentation without warranty, term, or condition of any kind, either
implied or expressed, including, but not limited to, the implied warranties, terms or conditions of
merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or
changes in the product(s) and/or the program(s) described in this documentation at any time.
If there is any software on removable media described in this documentation, it is furnished under a license
agreement included with the product as a separate document, in the hard copy documentation, or on the
removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy,
please contact 3Com and a copy will be provided to you.
UNITED STATES GOVERNMENT LEGEND
If you are a United States government agency, then this documentation and the software described herein are
provided to you subject to the following:
All technical data and computer software are commercial in nature and developed solely at private expense.
Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or
as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are
provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights
only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable.
You agree not to remove or deface any portion of any legend provided on any licensed program or
documentation contained in, or delivered to you in conjunction with, this User Guide.
Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not
be registered in other countries.
3Com, the 3Com logo and SuperStack are all registered trademarks of 3Com Corporation.
Novell and NetWare are registered trademarks of Novell Incorporated.
Adobe and Acrobat are registered trademarks of Adobe Systems Incorporated.
All other company and product names may be trademarks of the respective companies with which they are
associated.
Environmental Statement
It is a 3Com policy to be environmentally friendly in all operations. This manual is printed on paper that comes
from sustainable, managed European forests. The production process for making the pulp has a reduced AOX
level (adsorbable organic halogen) resulting in elemental chlorine-free paper.
The paper is fully biodegradable and recyclable.
DUA1730-0AAA02.book Page 2 Thursday, January 23, 2003 12:28 PM
CONTENTS
ABOUT THIS GUIDE
Conventions 8
Related Documentation 9
Accessing Online Documentation 10
Product Registration 10
Documentation Comments 10
1 INTRODUCING THE
S
UPERSTACK 3 SWITCH 4200 SERIES
About the Switch 4200 Series 12
Summary of Hardware Features 12
Switch 4200 Series — Front View Detail 13
10BASE-T/ 100BASE-TX Ports 14
10/100/1000BASE-T Ports 14
GBIC Ports 14
LEDs 15
Switch 4200 Series — Rear View Detail 17
Power Socket 17
Redundant Power System Socket 17
Console Port 17
Default Settings 18
2 INSTALLING THE SWITCH
Package Contents 20
Choosing a Suitable Site 20
Rack-mounting 21
Placing Units On Top of Each Other 23
Stacking Units 23
The Power-up Sequence 24
Powering-up the Switch 4200 Series 24
DUA1730-0AAA02.book Page 3 Thursday, January 23, 2003 12:28 PM
Checking for Correct Operation of LEDs 24
Connecting a Redundant Power System 25
Choosing the Correct Cables 25
Choosing the correct Fiber cables 26
GBIC Operation 27
Approved GBIC Transceivers 27
Inserting a GBIC Transceiver 27
3 SETTING UP FOR MANAGEMENT
Setting Up Overview 32
IP Configuration 33
Preparing for Management 34
Manually Configuring IP Information 35
Connecting to a Front Panel Port 35
Connecting to the Console Port 38
Viewing Automatically Configured IP Information 42
Using 3Com Network Supervisor 42
Connecting to the Console Port 42
Methods of Managing a Switch 45
Command Line Interface Management 45
Web Interface Management 46
SNMP Management 46
Setting Up Command Line Interface Management 47
CLI Management via the Console Port 47
CLI Management over the Network 47
Setting Up Web Interface Management 48
Pre-requisites 48
Web Management Over the Network 49
Setting Up SNMP Management 49
Pre-requisites 50
Default Users and Passwords 50
Changing Default Passwords 50
4 PROBLEM SOLVING
Solving Problems Indicated by LEDs 54
Solving Hardware Problems 55
Solving Communication Problems 55
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Solving Stack Formation Problems 56
Solving Software Upgrade Problems 57
A SAFETY INFORMATION
Important Safety Information 60
L’information de Sécurité Importante 62
Wichtige Sicherheitsinformationen 64
B PIN-OUTS
Null Modem Cable 67
PC-AT Serial Cable 67
Modem Cable 68
RJ-45 Pin Assignments 68
1000BASE-T RJ-45 Pin Assignments 69
C TECHNICAL SPECIFICATIONS
Switch 4226T
(3C17300) 71
Switch 4250T
(3C17302) 73
Switch 4228G
(3C17304) 74
D TECHNICAL SUPPORT
Online Technical Services 75
World Wide Web Site 75
3Com Knowledgebase Web Services 76
3Com FTP Site 76
Support from Your Network Supplier 76
Support from 3Com 77
Internet Support 77
Telephone Support 77
Returning Products for Repair 79
DUA1730-0AAA02.book Page 5 Thursday, January 23, 2003 12:28 PM
INDEX
REGULATORY NOTICES
DUA1730-0AAA02.book Page 6 Thursday, January 23, 2003 12:28 PM
ABOUT THIS GUIDE
This guide provides all the information you need to install and use a
SuperStack
®
3 Switch 4200 in its default state.
This guide is intended for use with all Switch 4200 Series models:
Switch 4226T (3C17300) — 24 10BASE-T/100BASE-TX ports,
2 10/100/1000BASE-T ports
Switch 4250T (3C17302) — 48 10BASE-T/100BASE-TX ports,
2 10/100/1000BASE-T ports
Switch 4228G (3C17304) — 24 10BASE-T/100BASE-TX ports,
2 10/100/1000BASE-T ports and 2 GBIC ports
All procedures described in this guide apply to all models except where
stated.
The guide is intended for use by network administrators who are
responsible for installing and setting up network equipment;
consequently, it assumes a basic working knowledge of LANs (Local Area
Networks).
If the information in the release notes that are shipped with your product
differ from the information in this guide, follow the instructions in the
release notes.
Most user guides and release notes are available in Adobe Acrobat
Reader Portable Document Format (PDF) or HTML on the 3Com
World Wide Web site:
http://www.3com.com/
DUA1730-0AAA02.book Page 7 Thursday, January 23, 2003 12:28 PM
8 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 port information, enter the following command:
bridge port detail
The words “enter”
and “type”
When you see the word “enter” in this guide, you must type
something, and then press Return or Enter. Do not press
Return or Enter when an instruction simply says “type.”
Keyboard key names If you must press two or more keys simultaneously, the key
names are linked with a plus sign (+). Example:
Press Ctrl+Alt+Del
Words in italics Italics are used to:
Emphasize a point.
Denote a new term at the place where it is defined in the
text.
Identify menu names, menu commands, and software
button names. Examples:
From the Help menu, select Contents.
Click OK.
DUA1730-0AAA02.book Page 8 Thursday, January 23, 2003 12:28 PM
Related Documentation 9
Related
Documentation
In addition to this guide, each Switch documentation set includes the
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.
There are other publications you may find useful, such as:
Documentation accompanying the Advanced Redundant Power
system.
Documentation accompanying 3Com Network Supervisor. This is
supplied on the CD-ROM that accompanies the Switch.
DUA1730-0AAA02.book Page 9 Thursday, January 23, 2003 12:28 PM
10 ABOUT THIS GUIDE
Accessing Online
Documentation
The CD-ROM supplied with your Switch contains the following online
documentation:
SuperStack 3 Switch Implementation Guide (PDF format)
SuperStack 3 Switch Management Interface Reference Guide (HTML
format)
1 To 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.
2 Select the Documentation section from the contents page.
If the online documentation is to be accessed from a local drive or server,
you will need to access the CD-ROM contents via the root directory and
copy the files from the CD-ROM to a suitable directory.
The HTML Reference Guide is stored in the Docs/reference directory
on the CD-ROM. The documentation is accessed using the
contents.htm file.
The PDF Implementation Guide is 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.
Product
Registration
You can register your SuperStack 3 Switch 4200 on the 3Com Web site:
http://3com.com/register
Documentation
Comments
Your suggestions are very important to us. They will help make our
documentation more useful to you. Please e-mail comments about this
document to 3Com at:
Please include the following information when commenting:
Document title
Document part number (on the title page)
Page number (if appropriate)
Example:
Part Number DUA 1730-0AAA0x
SuperStack 3 Switch 4200 Series Getting Started Guide
Page 21
DUA1730-0AAA02.book Page 10 Thursday, January 23, 2003 12:28 PM
1
INTRODUCING THE
SUPERSTACK 3 SWITCH 4200
SERIES
This chapter contains introductory information about the Switch 4200
Series and how it can be used in your network. It covers summaries of
hardware and software features and also the following topics:
About the Switch 4200 Series
Switch 4200 Series — Front View Detail
Switch 4200 Series — Rear View Detail
Default Settings
DUA1730-0AAA02.book Page 11 Thursday, January 23, 2003 12:28 PM
12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES
About the Switch
4200 Series
The Switch 4200 Series are stackable 10/100/1000 Mbps devices which
consists of:
24 or 48 10BASE-T/100BASE-TX ports
2 10/100/1000BASE-T ports
2 GBIC ports (Switch 4228G only)
The Switch provides high-performance workgroups with a backbone to
server connection. You can also add the Switch 4200 Series to any
SuperStack
®
system as your network grows.
Summary of
Hardware Features
Table 3 summarizes the hardware features that are supported by the
Switch 4200 Series.
Table 3 Hardware features
Feature Switch 4200 Series
Addresses Up to 8000 supported
Up to 64 permanent entries
Auto-negotiation Supported on all ports
Auto MDI/MDI-X
Forwarding Modes Store and Forward
Duplex Modes Half and full duplex on all 10/100 ports. Full duplex
on 1000BASE-T ports and full duplex on GBIC ports
Flow Control In full duplex operation all ports are supported
Smart Auto-sensing Supported on all ports except GBIC ports which are
single speed ports.
Smart auto-sensing allows auto-negotiating ports to
monitor and detect a high error rate on a link, or a
problem in the "physical" interconnection to
another port and react accordingly.
Traffic Prioritization Supported (IEEE 802.ID): 2 queues per port
Ethernet and Fast Ethernet
Ports
Auto-negotiating 10BASE-T/100BASE-TX ports
Gigabit Ethernet Auto-negotiating 10/100/1000BASE-T ports
GBIC Auto-negotiating GBIC ports (Switch 4228G only)
RPS Support Connects to SuperStack Advanced Redundant
Power System (ARPS) (3C16071, 3C16071A or
3C16071B)
Mounting 19-inch rack or stand-alone mounting
DUA1730-0AAA02.book Page 12 Thursday, January 23, 2003 12:28 PM
About the Switch 4200 Series 13
Switch 4200 Series
— Front View
Detail
Figure 1 Switch 4226T (3C17300) — front view
Figure 2 Switch 4250T (3C17302) — front view
Figure 3 Switch 4228G (3C17304) — front view
3C17300 Superstack 3 Switch 4226T
10BASE-T / 100BASE-TX
RJ-45 Ports
Power/
Self Test
Alert
Alert LED
21
91022
11
23 12 24
8
20
1
13
197
18
6
17
5
16
4
153
14
2
10/100/1000BASE-T
ports
26 / Down
25 / Up
Power / Self Test LED
Unit LEDs
1
2
3
4
Unit
3C17302 Superstack 3 Switch 4250T
10BASE-T / 100BASE-TX
RJ-45 Ports
Power / Self Test LED
Alert LED
8
32
1
25
31
7
30
6295
28
427
3
26
2
49
50
16
40
9
33
39
15
38
14
37
13361235
11
34
10
24
48
17
41
47
23462245
21
44
20
43
19
42
18
10/100/1000BASE-T
ports
Unit LEDs
Up
Down
Alert
Power/
Self Test
Unit
1
2
3
4
3C17304 Superstack 3
Switch 4228G
10BASE-T / 100BASE-TX
RJ-45 Ports
Power/
Self Test
Alert
Alert LED
21
91022
11
23 12 24
8
20
1
13
197
18
6
17
5
16
4
153
14
2
10/100/1000BASE-T
ports
26 / Down
25 / Up
Power / Self Test LED
Unit LEDs
1
2
3
4
Unit
GBIC ports
27
28
27
28
DUA1730-0AAA02.book Page 13 Thursday, January 23, 2003 12:28 PM
14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES
WARNING: RJ-45 Ports. These are shielded RJ-45 data sockets. They cannot
be used as standard traditional telephone sockets, or to connect the unit to a
traditional PBX or public telephone network. Only connect RJ-45 data
connectors, network telephony systems, or network telephones to these
sockets.
Either shielded or unshielded data cables with shielded or unshielded
jacks can be connected to these data sockets.
10BASE-T/
100BASE-TX Ports
The Switch has 24 or 48 auto-negotiating 10BASE-T/100BASE-TX ports
configured as Auto MDIX (cross-over). While auto-negotiation is enabled,
these ports can automatically detect whether they need to operate in
MDI or MDIX mode. Alternatively, you can manually set these ports to
10BASE-T half duplex, 10BASE-T full duplex, 100BASE-TX half duplex or
100BASE-TX full duplex. The maximum segment length is 100 m (328 ft)
over Category 5 twisted pair cable.
10/100/1000BASE-T
Ports
The Switch has two auto-negotiating 10/100/1000BASE-T ports
configured as Auto MDIX (cross-over). While auto-negotiation is enabled,
these ports can automatically detect whether they need to operate in
MDI or MDIX mode. These ports provide 10/100/1000 Mbps full duplex
connections to other Gigabit Ethernet devices. Full duplex allows packets
to be transmitted and received simultaneously which, in effect, doubles
the potential throughput of a link. These ports require either
straight-through or cross-over Category 5 cables with RJ-45 connectors at
both ends. The maximum UTP cable length is 100 m (328 ft) over
Category 5 cable.
The 10/100/1000BASE-T ports will auto-negotiate to the appropriate
speed.
GBIC Ports This section applies to the SuperStack 3 Switch 4228G only.
The two GBIC ports support Category 5 twisted pair cable and fiber
Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul (LH70)
GBIC transceivers in any combination. This offers you the flexibility of
using GBIC transceivers to provide connectivity between the Switch and
remote 1000 Mbps workgroups or to create a high capacity aggregated
link backbone connection.
DUA1730-0AAA02.book Page 14 Thursday, January 23, 2003 12:28 PM
About the Switch 4200 Series 15
Fiber GBIC's.
The default state for these ports is auto-negotiation enabled, where
speed, duplex and flow control modes are negotiated. Because the speed
and duplex modes are fixed by the media type, only the flow control is
negotiated with the link partner. Alternatively, auto-negotiation can be
disabled and the flow control setting can be manually configured.
1000BaseT GBIC's
These ports will auto-negotiate to 1000BASE-T, full duplex only. Although
it is not possible to disable auto-negotiation it is possible to change the
advertised capabilities for flow control support, effectively enabling or
disabling flow control.
LEDs 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
alternating
A 10 or 100 Mbps link is present, but the port is disabled.
Off No link is present.
Port Status LEDs GBIC ports
Green A 1000 Mbps link is present and the port is enabled.
Green flashing Packets are being transmitted/received on the port.
Port Status LEDs 10/100/1000BASE-T ports
Green A 1000 Mbps link is present and the port is enabled.
(continued)
DUA1730-0AAA02.book Page 15 Thursday, January 23, 2003 12:28 PM
16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES
Green flashing Packets are being transmitted/received on the port.
Yellow A 10 or 100 Mbps link is present and the port is enabled.
Yellow flashing Packets are being transmitted/received on the port.
Green / Yellow
alternating
A 10, 100 or 1000 Mbps link present but disabled.
Off No link is present.
Unit LEDs
1–4 Green When the Switch forms a stack with other Switch 4200
Series units the LED indicates the position of the unit in the
stack and that a link is present. Unit LED number 1 can also
indicate a stand-alone Switch.
Off The Switch initialization process is not complete.
Power/Self Test LED
Green The Switch is powered-up and operating normally.
Green flashing The Switch is either downloading software or is initializing
(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).
LED Color Indicates
DUA1730-0AAA02.book Page 16 Thursday, January 23, 2003 12:28 PM
About the Switch 4200 Series 17
Switch 4200 Series
— Rear View Detail
Figure 4 Switch 4200 Series — rear view
Power Socket The Switch automatically adjusts its power setting to any supply voltage
in the range 90-240 VAC.
Redundant Power
System Socket
To protect against internal power supply failure, you can use this socket
to connect a Switch 4200 to a SuperStack Advanced Redundant Power
System (RPS). See “Connecting a Redundant Power System”
on page 25.
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.
Power Socket
Console
(max) 19200,8,1,N
Console Port
Supply Data Warning Label
Redundant Power System Socket
DUA1730-0AAA02.book Page 17 Thursday, January 23, 2003 12:28 PM
18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4200 SERIES
Default Settings Table 5 shows the default settings for the Switch 4200 Series:
Table 5 Default Settings
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
Feature Switch 4200 Series
Automatic IP Configuration Enabled
Port Status Enabled
Port Speed All ports are auto-negotiated
Duplex Mode All ports are auto-negotiated
Flow Control Enabled in half duplex
Auto-negotiated in full duplex
Broadcast Storm Control Enabled
Virtual LANs (VLANs) All ports belong to the untagged Default VLAN
(VLAN 1) with 802.1Q learning operational
IP Multicast Filtering Filtering enabled
Rapid Spanning Tree Protocol
Fast Start:
Enabled
Enabled on all ports
RMON Alarm Enabled
Smart Auto-Sensing Enabled
LACP (10/100/1000BASE-T ports and GBIC ports only)
Enabled
Quality of Service (QoS) All ports prioritize NBX VoIP IP.
All ports set to “best effort” for all other traffic.
DUA1730-0AAA02.book Page 18 Thursday, January 23, 2003 12:28 PM
2
INSTALLING THE SWITCH
This chapter contains the information you need to install and set up the
Switch 4200 Series. It covers the following topics:
Package Contents
Choosing a Suitable Site
Rack-mounting
Placing Units On Top of Each Other
The Power-up Sequence
GBIC Operation
WARNING: Safety Information. Before installing or removing any
components from the Switch 4200 Series or carrying out any
maintenance procedures, you must read the safety information provided
in Appendix A
of this guide.
AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever
tout composant du Switch 4200 ou d'entamer une procédure de
maintenance, lisez les informations relatives à la sécurité qui se trouvent
dans l'Appendice A de ce guide.
VORSICHT: Sicherheitsinformationen. Bevor Sie Komponenten aus
dem Switch 4200 entfernen oder dem Switch 4200 hinzufuegen oder
Instandhaltungsarbeiten verrichten, lesen Sie die Sicherheitsanweisungen,
die in Appendix A (Anhang A) in diesem Handbuch aufgefuehrt sind.
DUA1730-0AAA02.book Page 19 Thursday, January 23, 2003 12:28 PM
20 CHAPTER 2: INSTALLING THE SWITCH
Package Contents Switch unit
CD-ROM
Getting Started Guide (this guide)
Management Quick Reference Guide
Release Notes
Unit Information Labels
Warranty Information
Power Cord
2 x Mounting brackets
4 x Screws
4 x Rubber feet
Choosing a Suitable
Site
The Switch is suited for use on a desktop, either free standing or
mounted in a standard 19-inch equipment rack. Alternatively, the Switch
can be mounted in a wiring closet or equipment room, as an aggregator
for other Hubs and Switches. A rack-mounting kit containing two
mounting brackets is supplied with the Switch.
CAUTION: Ensure that the ventilation holes are not obstructed.
When deciding where to position the Switch, ensure that:
Cabling is located away from:
sources of electrical noise such as radios, transmitters and
broadband amplifiers.
power lines and fluorescent lighting fixtures
The Switch is accessible and cables can be connected easily.
Water or moisture cannot enter the case of the Switch.
Air-flow is not restricted around the Switch or through the vents in the
side of the Switch. 3Com recommends that you provide a minimum of
25mm (1in.) clearance.
Air temperature around the Switch does not exceed 40 °C (104 °F).
If the Switch is installed in a 19-inch rack or closed assembly its local air
temperature may be greater than room ambient temperature.
DUA1730-0AAA02.book Page 20 Thursday, January 23, 2003 12:28 PM
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3com 3C17300 User manual

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