3Com 3CR17451-91, 3CR17450-91 User Manual
SuperStack® 3 Switch 3870 Family
Getting Started Guide
3CR17450-91
3CR17451-91
http://www.3com.com/
Part No. DUA1745-0AAA02
Published August 2004
3Com Corporation
350 Campus Drive
Marlborough
MA USA 01752-3064
Copyright © 2004, 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, the 3Com logo and SuperStack are registered trademarks of 3Com Corporation.
Intel 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.
IEEE and 802 are registered trademarks of the Institute of Electrical and Electronics Engineers, Inc.
IAll 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.
CONTENTS
ABOUT THIS GUIDE
Conventions 8
Related Documentation 9
Accessing Online Documentation 9
Documentation Comments 10
1 INTRODUCING THE SUPERSTACK 3 SWITCH 3870
About the Switch 3870 12
Summary of Hardware Features 12
Switch 3870 — Front View Detail 13
10BASE-T/
100BASE-TX/
1000BASE-T Ports 14
Dual Personality SFP Ports 14
Console Port 14
LEDs 15
Switch 3870 — Rear View Detail 17
Expansion Module Slot 17
Power Socket 17
Redundant Power System Socket 17
Stacking Cable Ports 17
Default Settings 18
2 INSTALLING THE SWITCH
Package Contents 22
Choosing a Suitable Site 22
Rack-mounting 23
Placing Units On Top of Each Other 24
The Power-up Sequence 25
Powering-up the Switch 3870 25
Checking for Correct Operation of LEDs 25
Connecting a Redundant Power Supply 25
Choosing the Correct Cables 26
SFP Operation 27
Approved SFP Transceivers 27
Inserting an SFP Transceiver 27
Removing an SFP Transceiver 29
3 SETTING UP FOR MANAGEMENT
Setting Up Overview 32
IP Configuration 33
Preparing for Management 34
Manually Configuring IP Information 35
Connecting to the Console Port 35
Viewing Automatically Configured IP Information 38
Using 3Com Network Supervisor 38
Connecting to the Console Port 38
Methods of Managing a Switch 41
Command Line Interface Management 41
Web Interface Management 42
SNMP Management 42
Setting Up Command Line Interface Management 42
CLI Management via the Console Port 43
CLI Management over the Network 43
Setting Up Web Interface Management 44
Pre-requisites 44
Web Management Over the Network 45
Setting Up SNMP Management 45
Pre-requisites 45
Default Users and Passwords 46
Changing Default Passwords 46
4 PROBLEM SOLVING
Solving Problems Indicated by LEDs 48
Solving Hardware Problems 49
Solving Communication Problems 51
Solving Software Upgrade Problems 53
A SAFETY INFORMATION
Power Cord Set — Japan 55
Important Safety Information 56
L’information de Sécurité Importante 58
Wichtige Sicherheitsinformationen 61
B PIN-OUTS
Null Modem Cable 63
PC-AT Serial Cable 63
Modem Cable 64
RJ-45 Pin Assignments 64
C TECHNICAL SPECIFICATIONS
Switch 3870 67
D OBTAINING SUPPORT FOR YOUR PRODUCT
Register Your Product to Gain Service Benefits 69
Purchase Value-Added Services 69
Troubleshoot Online 69
Access Software Downloads 70
Contact Us 70
Telephone Technical Support and Repair 70
INDEX
REGULATORY NOTICES
ABOUT THIS GUIDE
This guide provides all the information you need to install and use 3Com®
®
SuperStack
3 Switch 3870 (24 and 48 port) in its default state.
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).
Please refer to the CD-ROM that accompanies your Switch for the
following:
■ Management Interface Reference Guide — an online guide which
gives you detailed information on how to use the web interface and
command line interface to manage the Switch.
■ Other documentation relating to the 3Com SuperStack 3 Switch
3870.
■ 3Com Network Supervisor — a powerful network management tool
for small to medium enterprise networks.
■ A number of other useful applications.
If the information in the release notes that are shipped with your product
differ from the information in this guide, follow the instructions in the
release notes.
Most user guides and release notes are available in Adobe Acrobat
Reader Portable Document Format (PDF) or HTML on the 3Com
World Wide Web site:
http://www.3com.com/
8 ABOUT THIS GUIDE
Conventions Ta bl e 1 and Tab le 2 list conventions that are used throughout this guide.
Tab le 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.
Tab le 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.
Related Documentation 9
Related Documentation
In addition to this guide, each Switch documentation set includes the
following:
■ Management Quick Reference Guide
This guide contains:
■ a list of software features supported by each Switch.
■ a summary of the web interface and command line interface
commands for the Switch.
■ Release Notes
These notes provide information about the current software release,
including new features, modifications, and known problems.
■ 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.
■ 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.
Accessing Online Documentation
There are other publications you may find useful:
■ Documentation accompanying the Expansion Module.
■ Documentation accompanying the SFP Transceivers.
■ Documentation accompanying 3Com Network Supervisor. This is
supplied on the CD-ROM that accompanies the Switch.
The CD-ROM supplied with your Switch contains the following online
documentation:
■ Switch Implementation Guide (PDF format).
■ Switch Management Interface Reference Guide (HTML format).
■ Other documentation relating to the Switch 3870 (PDF format).
10 ABOUT THIS GUIDE
To access the online documentation from the CD-ROM:
1 Insert the CD-ROM into the relevant 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/referenceguide
on the CD-ROM. The documentation is accessed using the index.htm
file.
■ The PDF Implementation Guide is stored in the
Docs/implementation directory of the CD-ROM.
3Com recommends that you copy the Docs/referenceguide
directory as a whole to maintain the structure of the files.
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:
pddtechpubs_comments@3com.com
Please include the following information when commenting: Document
title, Document part number (on the title page) and Page number (if
appropriate).
Example:
Part Number DUA1745-0AAA01
3Com SuperStack 3 Switch 3870 Getting Started Guide
Page 21
1
INTRODUCING THE SUPERSTACK 3
S
WITCH 3870
This chapter contains introductory information about the Switch 3870
and how it can be used in your network. It covers summary information
about the hardware and the following topics:
■ About the Switch 3870
■ Switch 3870 — Front View Detail
■ Switch 3870 — Rear View Detail
■ Default Settings
12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3870
About the Switch 3870
Summary of
Hardware Features
The Switch 3870 24 port unit is a mixed media device which consists of:
■ 24 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports, of which 4 are
Dual Personality 10/100/1000BASE-T/1000BASE-X SFP ports
■ 4 Dual Personality 10/100/1000BASE-T/1000BASE-X SFP ports
The Switch 3870 48 port unit is a mixed media device which consists of:
■ 48 10BASE-T/100BASE-TX/1000BASE-T RJ-45 ports, of which 4 are
Dual Personality 10/100/1000BASE-T/1000BASE-X SFP ports
■ 4 Dual Personality 10/100/1000BASE-T/1000BASE-X SFP ports
For information about using the software features of the Switch, refer to
the “Switch Management Interface Reference Guide” on the CD-ROM
that accompanies the Switch.
Ta bl e 3
summarizes the hardware features that are supported by the
Switch 3870.
Tab le 3 Hardware features
Feature Switch 3870
MAC Addresses Up to 16,000 supported
Forwarding Modes Store and Forward
Auto-negotiation Supported on all ports
Auto MDI/MDIX Supported on all ports
Duplex Modes Half and full duplex on all ports
SFP Gigabit Ethernet
Ports
Flow Control Supported on all ports
Traffic Prioritization Supported (IEEE Std 802.1D, 1998 Edition)
Fast Ethernet and
Gigabit Ethernet Ports
RPS Support Connects to SuperStack 3 Advanced Redundant Power
Mounting 19-inch rack or stand-alone mounting
Supports fiber Gigabit Ethernet short-wave (SX),
long-wave (LX) and long-haul (LH70) transceivers in any
combination
Eight traffic queues per port
Auto-negotiating 10BASE-T/100BASE-TX/1000BASE-T
and SFP ports
System (ARPS).
Switch 3870 — Front View Detail 13
Switch 3870 —
Figure 1 Switch 3870 (24 ports) — front view
Front View Detail
Port Status LEDs
1 432 5 678 9 10 11 1213 161514 17 18 19 20 21 22 23 24
10/100/1000BASE-T Ports
Figure 2 Switch 3870 (48 ports) — front view
Port Status LEDs
1 432 5 678 9 10 11 1213 161514 17 18 19 20 21 22 23 24 25 282726 29 30 31 32 33 34 35 3637 403938 41 42 43 44 45 46 47 48
Stack Master LEDs
Fault LED
Module Activity LED
1000BASE-X SFP Ports
Stack Master LEDs
Fault LED
Module Activity LED
Stack Status/
Power/Self Test LED
Module Status LED
Power
Fault
Stack
S
Master
P
S
Module
Activity
SuperStack 3 Switch 3870 24-port
21
22 23
Dual Personality
10/100/1000BASE-T/
Stack Status/
Power/Self Test LED
Module Status LED
Fault
Power
Stack
S
Master
Module
S
P
Activity
SuperStack 3 Switch 3870 48-port
45
46 47
Console Port
Unit LED
24
Console Port
Unit LED
48
10/100/1000BASE-T Ports
Dual Personality
10/100/1000BASE-T/
1000BASE-X SFP Ports
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.
14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3870
10BASE-T/
100BASE-TX/
1000BASE-T Ports
Dual Personality SFP
Ports
The 10BASE-T/100BASE-TX/1000BASE-T ports have RJ-45 connectors and
are configured as Auto MDIX (cross-over).
The default state for these ports is auto-negotiation enabled, where the
speed, duplex and flow control modes of a link are automatically
detected to provide the highest available bandwidth with the link partner.
Alternatively, auto-negotiation can be disabled. These ports can be
manually configured to 10 Mbps half duplex, 100 Mbps half duplex,
10 Mbps full duplex or 100 Mbps full duplex. It is not possible to
manually configure a 1000 Mbps link as auto-negotiation is mandatory in
the 1000 Mbps standard. If auto-negotiation is disabled, Auto MDIX
cannot function and the ports are fixed as MDIX (cross-over) mode.
If auto-negotiation is disabled on a 1000 Mbps port, the speed will drop
to the highest available speed. By default this is 100 Mbps.
The 4 Dual Personality SFP (Small Form Factor Pluggable) ports support
fiber Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul
(LH70) 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
negotiated with the link partner. Alternatively, auto-negotiation can be
disabled 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.
The standard null modem cable is set to autobaud (up to a maximum of
19,200 baud), 8 data bits, no parity and 1 stop bit.
Switch 3870 — Front View Detail 15
LEDs Ta bl e 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 “Checking for Correct Operation of LEDs”
Tab le 4 LED behavior
LED Color Indicates
Port Status/Packet LEDs
Green A high speed (1000 Mbps) link is present, and the port
is enabled.
Green flashing A high speed (1000 Mbps) link is present and active.
Yellow A low speed (10/100 Mbps) link is present, and the
Yellow flashing A low speed (10/100 Mbps) link is present and active.
Green for one
second, Amber
for one second,
then OFF until
operational.
Alternate yellow
then green
flashing (fast)
Alternate yellow
then green
flashing
Off No link is present.
Stacking Status LED
Green The uplink/downlink is operating normally.
Yellow One-sided connection (one side of the cable is
Off No stacking link is present.
Stack Master LED
Green Master unit - normal stack operation status.
Yellow Slave unit - normal stack operation status.
Yellow flashing The system is in arbitration/election status.
Off The system is not stacked.
port is enabled.
POST in operation, all LEDs perform a one second lamp
test.
A port has failed a loop back test during POST.
A link is present but the port has been disabled.
connected but the other side is not).
on page 25.
16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3870
LED Color Indicates
Module LEDs
Packet Yellow Packets are being transmitted/received on the port.
Off No packets are being transmitted/received on the port.
Status Green The Module is installed and supported and the Link
Yellow The Module is installed and supported but there is no
Yellow flashing The Module is installed but not supported or has failed
Off The Module is not installed.
Unit LED
Green The Switch is stacked and the position within the stack
Off The Switch is not stacked.
Power/Self Test LED
Green The Switch is powered-up and operating normally.
Green flashing The Switch is either downloading software or is
Yellow The Switch is faulty.
Off The Switch is not receiving power or there is a fault
Fault LED
Red The Switch and/or the PSU and/or the Module are
Off The Switch, PSU and the Module are below critical
Status has been determined.
link or an indeterminate link status.
POST.
is displayed.
initializing (which includes running a Power On Self
Test).
with the Power Supply unit.
above critical temperature but below critical shut down
temperature. Fans are operating normally.
temperature. One or more fans have failed.
Switch 3870 — Rear View Detail 17
Switch 3870 — Rear
View Detail
Power Socket
Redundant Power System Socket
Expansion Module
Slot
Power Socket Each Power Supply automatically adjusts its power setting to any power
Redundant Power
System Socket
Figure 3 Switch 3870 — rear view
Expansion Module Slot
D
O
W
N
Stacking Cable Port (Down)
Stacking Cable Port (Up)
U
P
You can use this slot to install an Expansion Module. Contact your
supplier for further information.
WARNING:
When an Expansion Module is not installed, ensure the
blanking plate is fitted by tightening all screws with a suitable tool.
voltage in the range 100-240 VAC.
To protect against internal power supply failure, you can use this socket
to connect the Switch to a SuperStack 3 Advanced Redundant Power
System. See “Connecting a Redundant Power Supply”
on page 25.
Stacking Cable Ports You can use these ports to connect the following cables:
■ Stacking Cable (3C17462) — which enables you to stack together
two switches up to three rack units apart.
■ Resilient Stacking Cable (3C17463) — which enables you to stack
together two switches up to sixteen rack units apart.
You can stack together any combination of 3870 24 port and 48 port
units, up to a maximum of eight units.
For more information on how to connect a stacking cable to your switch
units, please refer to the Installation Guide that accompanies your cable.
18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3870
Some combinations of stacked 24 and 48 port units restrict the number
of modules supported by the stack. Tab le 5
configurations restrict the number of supported modules:
Tab le 5 Maximum Stack Configurations
Type of Unit Total Units in the Stack Maximum Modules
48 Port 24 Port
0 8 8 8
8 0 8 0
7 1 8 2
7 0 7 4
6 2 8 4
6 1 7 6
6 0 6 6
shows which stack
Default Settings Ta b le 6 shows the default settings for the Switch 3870. If you initialize
one of the Switch units, it is returned to these defaults.
Tab le 6 Default Settings
Feature Switch 3870
Port Status Enabled
Port Speed Auto-negotiated
Duplex Mode Auto-negotiated
Flow Control Auto-negotiated
Broadcast Storm Control Enabled
High threshold: 3000 broadcast frames per
second — Notify and filter
Low threshold: 1500 broadcast frames per
second — Notify and unfilter
Virtual LANs (VLANs) All ports belong to the untagged Default VLAN
(VLAN 1)
Multicast Filtering IGMP filtering enabled
Rapid Spanning Tree Protocol Enabled
Default Settings 19
Feature Switch 3870
Link Aggregation Control
Disabled per port
Protocol (LACP)
Spanning Tree Protocol Enabled
Smart Auto-sensing Enabled
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 Gateway
20 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 3870
2
INSTALLING THE SWITCH
This chapter contains the information you need to install and set up the
Switch 3870. 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
WARNING: Safety Information. Before installing or removing any
components from the Switch 3870 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 de Switch 3870 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 3870 entfernen oder den Switch 3870 hinzufügen oder
Instandhaltungsarbeiten verrichten, lesen Sie die
Sicherheitsanweisungen, die in Anhang A in diesem Handbuch
aufgeführt sind.
22 CHAPTER 2: INSTALLING THE SWITCH
Package Contents ■ Switch unit
■ CD-ROM
■ This Guide
■ Management Quick Reference Guide
■ Release Notes
■ Warranty Flyer
■ Power Cord
■ 2 x securing brackets
■ 8 x screws
■ 4 x rubber feet
■ RJ45 to DB9 converter cable
Choosing a Suitable Site
The Switch 3870 is suited for use in an internal wiring closet, a network
room, or telecommunications room, where it can be mounted in a
standard 19-inch equipment rack, or free-standing.
CAUTION: Ensure that the ventilation holes are not obstructed.
To ensure this product provides optimum performance, high speed fans
are used to provide ventilation. These fans have a high audible output
while running at full speed. The Switch 3870 is designed to reduce the
fan speed shortly after power on (if thermal conditions allow) which will
also reduce the fan noise generated.
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
25 mm (1 in.) clearance.
■ Air temperature around the Switch does not exceed 40 °C (104 °F).
Rack-mounting 23
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.
■ No more than four Switch units are placed on top of one another, if
the units are free-standing.
Rack-mounting The Switch 3870 is 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.
CAUTION: If you use a shelf or support ensure that it will not obstruct
the air flow through the side panels of the Switch.
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 securing bracket over the mounting holes on one side of the
Switch, as shown in Figure 4
.
3 Insert the four screws and tighten with a suitable screwdriver.
Loading...