Trendnet TE100-DS24 User Manual

TE100-DM/DS Series
Dual-Speed Hub
User’s Guide

Rev. 01 (May, 1998)

6012-0165001

Printed In Taiwan

RECYCLABLE

Wichtige Sicherheitshinweise

1. Bitte lesen Sie sich diese Hinweise sorgf? tig durch.

2. Heben Sie diese Anleitung f? den sp? ern Gebrauch auf.

3. Vor jedem Reinigen ist das Ger? vom Stromnetz zu trennen. Vervenden Sie keine Fl? sig­oder Aerosolreiniger. Am besten dient ein angefeuchtetes Tuch zur Reinigung.

4. Um eine Besch? igung des Ger? es zu vermeiden sollten Sie nur Zubeh? teile verwenden,
die vom Hersteller zugelassen sind.

5. Das Ger? is vor Feuchtigkeit zu sch? zen.

6. Bei der Aufstellung des Ger? es ist auf sichern Stand zu achten. Ein Kippen oder Fallen k?
nte Verletzungen hervorrufen. Verwenden Sie nur sichere Standorte und beachten Sie die
Aufstellhinweise des Herstellers.

7. Die Bel? tungs? fnungen dienen zur Luftzirkulation die das Ger? vor ? erhitzung sch? zt.
Sorgen Sie daf? , daß diese ? fnungen nicht abgedeckt werden.

8. Beachten Sie beim Anschluß an das Stromnetz die Anschlu? erte.

9. Die Netzanschlu? teckdose muß aus Gr? den der elektrischen Sicherheit einen
Schutzleiterkontakt haben.

10. Verlegen Sie die Netzanschlu? eitung so, daß niemand dar? er fallen kann. Es sollete auch
nichts auf der Leitung abgestellt werden.

11. Alle Hinweise und Warnungen die sich am Ger? en befinden sind zu beachten.

12. Wird das Ger? ? er einen l? geren Zeitraum nicht benutzt, sollten Sie es vom Stromnetz
trennen. Somit wird im Falle einer ? erspannung eine Besch? igung vermieden.

13. Durch die L? tungs? fnungen d? fen niemals Gegenst ? de oder Fl? sigkeiten in das Ger?
gelangen. Dies k? nte einen Brand bzw. Elektrischen Schlag ausl? en.

14. ? fnen Sie niemals das Ger? . Das Ger? darf aus Gr? den der elektrischen Sicherheit nur
von authorisiertem Servicepersonal ge? fnet werden.

15. Wenn folgende Situationen auftreten ist das Ger? vom Stromnetz zu trennen und von einer
qualifizierten Servicestelle zu ? erpr? en:

a– Netzkabel oder Netzstecker sint besch? igt.
b– Fl? sigkeit ist in das Ger? eingedrungen.
c– Das Ger? war Feuchtigkeit ausgesetzt.
d– Wenn das Ger? nicht der Bedienungsanleitung ensprechend funktioniert oder Sie mit

Hilfe dieser Anleitung keine Verbesserung erzielen.
e– Das Ger? ist gefallen und/oder das Geh? se ist besch? igt.
f– Wenn das Ger? deutliche Anzeichen eines Defektes aufweist.

ii

16. Bei Reparaturen d? fen nur Orginalersatzteile bzw. den Orginalteilen entsprechende Teile
verwendet werden. Der Einsatz von ungeeigneten Ersatzteilen kann eine weitere Besch?
igung hervorrufen.

17. Wenden Sie sich mit allen Fragen die Service und Repartur betreffen an Ihren
Servicepartner. Somit stellen Sie die Betriebssicherheit des Ger? es sicher.

iii

Trademarks

Contents subject to change without prior notice.
All trademarks belong to their respective proprietors.

Copyright Statement

No part of this publication may be reproduced in any form or by any
means or used to make any derivative such as translation, transfor­mation, or adaptation without permission from the manufacturer, as
stipulated by the United States Copyright Act of 1976.

FCC Warning

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 reasonable 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 this user’s guide, 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 own expense.

CE Mark Warning

This is a Class A product. In a domestic environment, this product
may cause radio interference in which case the user may be required
to take adequate measures.

VCCI A Warning

iv

v

TABLE OF C ONTENTS

ABOUT THIS GUIDE.................................................................xi

Models Covered........................................................................xi

Conventions .............................................................................xi

Overview of the User's Guide ..................................................xii

CHAPTER 1 : INTRODUCTION.....................................................1

Product Description..................................................................1

Product Features......................................................................2

Dual-Speed Ethernet Hub..........................................................4

Technology Overview ................................................................4

100BASE-TX Technology Overview............................................5

100Mbps Fast Ethernet Introduction.........................................................5

Cables and Connectors...................................................................................6

Topology.............................................................................................................6

Network Diameter...........................................................................................7

Hub Types.........................................................................................................7

CHAPTER 2 : UNPACKING AND SETUP......................................9

Unpacking ................................................................................9

Identifying External Components ............................................ 10

Front Panel.....................................................................................................10

Rear Panel.......................................................................................................12

Installing the Hub ...................................................................13

About This Guide vi

Installation.....................................................................................................13

Rack Mounting...............................................................................................14

Replacing the Power Supply .................................................... 15

CHAPTER 3 : UNDERSTANDING INDICATORS ..........................17

Hub State Indicators............................................................... 18

Module Indicators (SLOT1 & 2) .............................................. 19

Port State Indicators .............................................................. 20

SNMP Indicator ..................................................................... 21

Port Speed Indicators ............................................................. 21

Console Port Indicator (CON).................................................. 22

CHAPTER 4 : MAKING CONNECTIONS.....................................23

Hub Cascad ing/Building a Stack ............................................23

Connectivity Rules.................................................................. 25

The Diagnostic Port................................................................ 26

Diagnostic Port Connection.........................................................................26

Hub to End-Station Connection............................................... 27

Hub-to-Hub Uplink ................................................................. 29

Optional Module Connections ..................................................31

Module Installation......................................................................................31

Switch Module................................................................................................32

Fiber Optic Module.......................................................................................33

Fast Ethernet Module..................................................................................34

CHAPTER 5 : MASTER HUB SETUP AND MANAGEMENT.........37

Navigation and Conventions ................................................... 38

In-Band Setup Instructions..................................................... 39

vii

Dual-Speed Stackable Hubs User’s Guide

Backup Master Function ......................................................... 40

Segmenting Hubs.................................................................... 41

Logging in to the Hub Console ................................................ 43

Logging In ........................................................................................................43

Changing Your Password.............................................................................45

Setting Up the Master Hub ..................................................... 47

TCP/IP Settings .............................................................................................47

Out-of-Band Management and Console Settings ..................................49

Software Update on Boot.............................................................................50

SNMP Information........................................................................................52

SNMP Traps...................................................................................................53

SNMP Security (Community Names)......................................................55

Adding and Deleting Users .........................................................................56

Primary/Backup Master..............................................................................58

Hub Stack Management.......................................................... 59

Controlling Hubs in the Hub Stack...........................................................59

Controlling Individual Ports.......................................................................62

Monitoring the Hub Stack....................................................... 64

Displaying Port and Group Statistics.......................................................64

Displaying Segment Statistics...................................................................68

Node Trackin g................................................................................................70

Per-Port Intrusion Security.........................................................................71

Bridge Information........................................................................................71

Resetting the Hub................................................................... 72

System Reset..................................................................................................73

Factory Reset..................................................................................................74

APPENDIX A : CABLES AND CONNECTORS ............................75

100BASE-TX Ethernet Cable and Connectors........................... 75

Crossover Cables .....................................................................76

Diagnostic Port Specifications................................................. 77

RS-232 (DB9) Pin Specification.................................................................77

viii

APPENDIX B : BOOT CONFIGURATION FILE...........................79

APPENDIX C : SPECIFICATIONS ..............................................83

General................................................................................... 83

Hub-to-Hub Cascading............................................................ 84

LED Indicators....................................................................... 84

Environmental and Physical ................................................... 84

APPENDIX D : GLOSSARY .......................................................87

INDEX.........................................................................................96

ix

0 A BOUT THIS GUIDE

This guide discusses how to install and use the TE100-DM/DS series
dual-speed, managed/unmanaged, stackable Ethernet/ Fast Ethernet
Hubs.

Models Covered

Unmanaged Models: TE100-DS16, TE100-DS16X, TE100-DS24,
TE100-DS24X.

Managed Models: TE100-DM16, TE100-DM16X, TE100-DM24,
TE100-DM24X.

All “X” models include a switch module in Slot 1 of the rear panel.
All “M” models are intelligent (that is, “managed”) hubs capable of
managing an entire hub stack.

The model numbers also indicate how many ports a particular hub
has, thus: DM16/DS16 hubs have 16 ports and DM24/ DS24 hubs
have 24 ports.

Conventions

References in this manual to the TE100-DS16, TE100-DS16X,
TE100-DS24, TE100-DS24X; TE100-DM16, TE100-DM16X, TE100­DM24, and TE100-DM24X hubs are frequently written simply as
“hub” or “hubs” where the text applies to all models. Model numbers

About This Guide xi

Dual-Speed Stackable Hubs User’s Guide

xii

are normally used only to differentiate between them where neces­sary.

At points in this document, master models are differentiated by re­ferring to, “TE100-DM/DS series master hubs.”

Unless differentiated by model number or other specific reference, all
information applies to all models.

Overview of the User’s Guide

? ?Chapter 1, Introduction. Provides information on Fast

Ethernet networks, and introduces the features of the TE100­DM/DS series hubs.

? ?Chapter 2, Unpacking and Setup. Helps you get started in

setting up the hub.

? ?Chapter 3, Understanding Indicators. Describes all LED in-

dicators on the hub’s front panel. Understanding these
indicators is essential to effectively using the hub.

? ?Chapter 4, Making Connections. Provides information on

connecting to the hub’s twisted-pair and console ports, stack­ing hubs, and linking with other 100BASE-TX hubs.

? ?Chapter 5, Master Hub Setup and Management. Provides

information on using the management agent built into master
models in the DH series.

? ?Appendix A, Cables and Connectors. Provides specifications

on the cables and connectors used with the hubs.

? ?Appendix B, Boot Configuration File. Describes the TE100-

DM/DS series master hub boot configuration file.

About This Guide

xiii

? ?Appendix C, Specifications. Lists the hubs’ specifications.
? ?Appendix D, Glossary. Provides the meaning for some net-

working terms used in this manual.

About This Guide

1

1 INTRODUCTION

This chapter introduces the TE100-DM/DS series dual-speed stack­able hubs, as well as giving some background information about the
technology the hubs use.

Product Description

The TE100-DM/DS series dual-speed stackable Ethernet/Fast
Ethernet hubs are designed to allow easy migration and integration
between 10Mbps Ethernet and 100Mbps Fast Ethernet, while provid­ing manageability and flexibility in cable connections.

The TE100-DM/DS hubs can operate with either IEEE 802.3
10BASE-T connections (twisted-pair Ethernet operating at 10 meg a­bits per second), or IEEE 802.3u 100BASE-TX connections (twisted­pair Fast Ethernet operating at 100 megabits per second). All of the
twisted-pair ports support NWay auto-negotiation, allowing the hub
to automatically detect the speed of a network connection. This
means you can connect all of your Ethernet and Fast Ethernet hosts
to a TE100-DM/DS series hub stack, without any rewiring required
when a host is upgraded from 10Mbps to 100Mbps.

The TE100-DM/DS series hubs, available in 16-port and 24-port
models, can be stacked with up to five hubs in a stack. A stack of
five 24-port hubs gives a total of 120 Ethernet or Fast Ethernet ports.

Introduction 1

Dual-Speed Stackable Hubs User’s Guide

A TE100-DM/DS series hub stack operates as a Class II Fast
Ethernet repeater, allowing it to be linked to another Class II Fast
Ethernet stack in the same collision domain.

In the basic configuration, the 10Mbps and 100Mbps segments are
separate and do not intercommunicate. An optional switch module
(included with the TE100-DS16X, TE100-DS24X, TE100-DM16X, and
TE100-DM24X) can be installed in any hub in the stack, making it
possible to transparently bridge between the 10Mbps and 100Mbps
segments. In a managed hub stack, more than one switch module
can be used to provide redundancy if the two modules are both in the
primary master hub segment.

Other add-in modules are also available, providing switched
100BASE-TX, or switched 100BASE-FX connections. TE100-DM/DS
series hubs each have two slots for accepting slide-in modules.

Product Features

The list below highlights the features and specifications of the
TE100-DM/DS series hubs.

? ?Compatible with the IEEE 802.3 10BASE-T Ethernet and

802.3u 100BASE-TX Fast Ethernet industry standards for in­teroperability with other Ethernet/Fast Ethernet network
devices.

? ?Ethernet connections support Category 3 or better twisted-pair

cables.

? ?Fast Ethernet connections support both shielded twisted pair

and Category 5 unshielded twisted-pair cables.

? ?Fast Ethernet connections support a maximum distance of 100

meters from end-station to hub, and a total network diameter
of 205 meters.

Introduction 2

? ?Sixteen (TE100-DS16, TE100-DS16X, TE100-DM16, TE100-

DM16X) or twenty-four (TE100-DS24, TE100-DS24X, TE100­DM24, TE100-DM24X) NWay RJ-45 ports for connecting sta­tions to the network.

? ?Full hub stack and network management provided via a

SNMP management agent (TE100-DM16, TE100-DM16X,
TE100-DM24, TE100-DM24X).

? ?An optional slide-in switch module allows bridging between

10Mbps and 100Mbps segments. Only one switch module is
needed per stack, but managed hub stacks can make use of
additional switch modules for redu ndancy.

? ?LED indicators for power, collisions, link, network activity,

partitioning status, disable, operating speed (10 or 100Mbps)
and network utilization .

? ?Digital hub ID number front panel display.
? ?Auto-partition protection.
? ?Data collision detection and handling.
? ?Preamble regeneration, signal re-timing.
? ?Two proprietary daisy-chain ports for cascading up to five hubs

to form one logical hub; management provided via a master
hub.

? ?Standby backup master capability when two master model

hubs are present within a single stack.

? ?Uplink port allows easy linking of two Fast Ethernet hub

stacks to further expand your network.

? ?Standard-size (19”, 1.25U height), rack mountable
? ?Built-in, removable power supply, replaceable without opening

the hub. Power supply is easily removed and replaced. Auto-

Introduction 3

Dual-Speed Stackable Hubs User’s Guide

4

matic voltage selection (100V to 240V, 50 or 60Hz) without
fuses to change or a voltage switch to set.

? ?Optional slide-in modules: Switch, 100BASE-TX, and

100BASE-FX (see Chapter 4 : Making Connections).

Dual-Speed Ethernet Hub
Technology Overview

Dual-speed Ethernet hubs have been developed to make it simpler to
plan networks containing both 10Mbps Ethernet and 100Mbps Fast
Ethernet technologies, especially when network hosts are being
gradually migrated to new Fast Ethernet connections.

10Mbps Repeater

100Mbps Repeater

NWay Detection

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps
Ethernet

Station

10Mbps

Ethernet

Station

100Mbps

Ethernet

Station

A dual-speed hub is actually two repeaters in one enclosure. The
10Mbps repeater receives Ethernet transmissions from any of its
ports, and retransmits them to all other ports operating at 10Mbps.
Similarly, the 100Mbps repeater retransmits Fast Ethernet trans­missions from ports operating at 100Mbps to all other ports operating
at the same speed.

Introduction

If there is a switch module, or a TE100-DS16X, TE100-DM16X,
TE100-DS24X or TE100-DM24X hub presents in the stack, then the
switch module serves as a bridge between the two indepen dent seg­ments.

10Mbps Repeater

100Mbps Repeater

NWay Detection

TE100-DSM

Switch

Module

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps
Ethernet

Station

10Mbps
Ethernet

Station

100Mbps

Ethernet

Station

100BASE-TX Technology Overview

100Mbps Fast Ethernet Introduction

Computers today have become increasingly powerful, with the capa­bility to accommodate very sophisticated applications such as
multimedia applications, video-conferencing, and CAD/CAM. To util­ize these technologically advanced applications more efficiently, there
is also a growing demand for faster networks that can handle heavy
network traffic.

Recognizing this need for greater bandwidth and lower latency, a
variety of technologies such as FDDI, ATM, and Fast Ethernet
(100Mbps) have been adopted by many vendors. Fast Ethernet tec h­nology stands out as the most inexpensive and smoothest migration

Introduction 5

Dual-Speed Stackable Hubs User’s Guide

path for existing 10Mbps Ethernet users in part because it doesn’t
require a protocol translation when sharing data with 10Mbps
Ethernet.

Fast Ethernet is a relatively new standard specified by the IEEE

802.3 LAN committee. It is an extension of the 10Mbps Ethernet
standard with the ability to transmit and receive data at 100Mbps,
while maintaining the CSMA/CD Ethernet protocol. Since Fast
Ethernet is compatible with all 10Mbps Ethernet environments, it
provides a straightforward upgrade without wasting the company’s
existing investment in hardware, software, and trained personnel.

Cables and Connectors

Category 5 unshielded twisted-pair (UTP) cables and shielded
twisted-pair (STP) cables are both supported. Category 5 UTP cable
uses the same RJ-45 connector used with 10BASE-T, wired in the
same configuration.

Topology

A Fast Ethernet workgroup is configured in a star topology and is
built around a maximum of two repeaters. Each workgroup forms a
separate LAN (also known as a segment or collision domain), and
these workgroups can be easily interconnected through switches,
bridges, or routers to form one LAN large enough to encompass a
high-rise building or campus environment. Recent innovations in
LAN hub technology such as stackable hubs, coupled with the de­creasing cost of switches, bridges, and routers, allow the design of
low-cost, efficient Fast Ethernet workgroups and enterprise LANs.

The following factors strongly influence the architecture of Fast
Ethernet networks:

Introduction 6

?? The EIA/TIA 568 Wiring Standard imposes a 100 meter limit

on horizontal runs of twisted-pair cables; that is, connections
from the wiring closet to the end-station.

?? Fast Ethernet’s increased operational speed reduces the

maximum distance between all elemen ts of the LAN (see be­low).

?? The EIA/TIA 568 Wiring Standard does not support the use of

coaxial cables for horizontal wiring.

Network Diameter

Network diameter, which is the distance between two end-stations in
the same collision domain, is the primary difference between tradi­tional Ethernet and Fast Ethernet. Due to the increased speed in
Fast Ethernet and adherence to the EIA/TIA 568 wiring rules, the
network diameter of a Fast Ethernet collision domain is limited to
205 meters; in contrast, the maximum 10BASE-T Ethernet collision
domain diameter can be up to 500 meters.

Hub Types

Unlike 10BASE-T hubs which are all functionally identical, Fast
Ethernet hubs are divided into two distinct types: Class I and Class
II. A Class I hub repeats all incoming signals on one port to the
other ports by first translating them to digital signals and then re­translating them back to line signals. These translations are
necessary when connecting various network media to the same colli­sion domain, such as when combining two wire-pair 100BASE-TX
media with four wire-pair 100BASE-T4 media. Only one Class I hub
can exist within the same collision domain, thus this type of hub
cannot be directly inter-linked. A Class II repeater, on the other
hand, immediately repeats all incoming line signals on one port to
the other ports; no translations are performed. This type of hub con­nects identical media within the same collision domain; for example,

Introduction 7

Dual-Speed Stackable Hubs User’s Guide

TX to TX. At most, two Class II hubs can exist within the same col­lision domain.

As mentioned earlier, stackable Class II hubs can be used to increase
the number of available nodes in a collision domain. An entire hub
stack counts as a single repeater. TE100-DM/DS series hubs are
Class II devices.

Introduction 8

2

2 U NPACKING AND

S ETUP

This chapter provides information on the unpacking and initial in­stallation of your hub stack.

Unpacking

Open the shipping carton of your hub and carefully unpack the con­tents. The carton should contain the following items:

? ?One dual-speed stackable hub
? ?One AC power cord, suitable for your area’s electrical power

connections

? ?One daisy-chain cable
? ?Four rubber feet to be used for shock cushioning
? ?Six screws and two mounting brackets
? ?Management module diskette (master models only)
? ?This User’s Guide

Unpacking and Setup 9

Dual-Speed Stackable Hubs User’s Guide

Inspect the hub and all accompanying items. If any item is damaged
or missing, report the problem to your dealer.

Identifying External Components

This section identifies all the major external components of the hub.
Both the front and the rear panels are shown, followed by a descrip­tion of each panel feature. The indicator panel is described in detail
in the next chapter.

Front Panel

TE100-DM24 / TE100-DM24X Front Panel

TE100-DS24 / TE100-DS24X Front Panel

TE100-DM16 / TE100-DM16X Front Panel

TE100-DS16 / TE100-DS16X Front Panel

Unpacking and Setup 10

? ?LED Indicator Panel
Refer to the next chapter, Understanding Indicators, for detailed

information about each of the hub’s LED indicators.

? ?Twisted-Pair Ports
Use any of these ports to connect stations to the hub. The ports

are MDI-X Nway ports, which means you can use ordinary
straight-through twisted-pair cable to connect the hub to PCs,
workstations, or servers through these ports, and the speed of the
connection will be detected automatically. If you need to connect
to another device with MDI-X ports such as another hub or an
Ethernet switch, you should use a crossover cable, or connect us­ing the Uplink port (described below). For more information
about crossover connection, see the Crossover Cables section on
page 76.

? ?Uplink Port
The Up-link port is an MDI port, which means you can connect

the hub (or hub stack) to another device with MDI-X ports using
an ordinary straight-through cable, making a crossover cable un­necessary.

Port 1 and the Up-link port are the same logical port, except

their pin-outs are different. Do not use both Port 1 and the
Up-link port at the same time.

Unpacking and Setup 11

Dual-Speed Stackable Hubs User’s Guide

Rear Panel

(Note that the figure shows the rear panel for “Master” model.)
? ?Module Slots
Used to install module options for various kinds of additional con-

nections, as well as the switching 10Mbps/100Mbps bridge
module. (In the TE100-DS16X, TE100-DM16X, TE100-DS24X
and TE100-DM24X, module slot 1 is already occupied by the
“switch module” which is standard on these models.)

? ?Daisy-Chain IN Port
When cascading a set of stackable dual-speed hubs, this port

should be connected to the Daisy-Chain OUT port of the prev ious
hub in the stack (usually placed immediately above it). A cascade
of five hubs can be created in this way. The first and last hubs in
the stack use only one of the daisy-chain ports, while the others
use both.

? ?Daisy-Chain OUT Port
Works in conjunction with the Daisy-Chain IN Port (see above).

Connect this port to the Daisy-Chain IN Port of the next hub in

Unpacking and Setup 12

the stack (usually placed immediately below it), using the en­closed daisy-chain cable.

? ?Diagnostic (Console) Port -- Master Models Only
This 9-pin serial connector is used for connecting a console to the

TE100-DM/DS series master hubs for out-of-band management of
this particular hub or the entire stack.

? ?Fan
Provides air circulation and heat dissipation. Be sure to leave

adequate space at the rear of the unit for proper ventilation.

? ?AC Power Connector
For the power cord.

Installing the Hub

Installation

The site where you install the hub stack may greatly affect its per­formance. When installing, consider the following pointers:

? ?Install the hub stack in a fairly cool and dry place. See Ap-

pendix D, Specifications, for the acceptable temperature and
humidity operating ranges.

? ?Install the hub stack in a site free from strong electromagnetic

field generators (such as motors), vibration, dust, and direct
exposure to sunlight.

Unpacking and Setup 13

Dual-Speed Stackable Hubs User’s Guide

14

? ?Leave at least 10cm of space at the front and rear of the hub

for ventilation. For more information see, “Environmental and
Physical” on page 84.

? ?Install the hub on a sturdy, level surface that can support its

weight, or in an EIA standard-size equipment rack. For in­formation on rack installation, see the next section, Rack
Mounting.

When installing the hub stack on a level surface, attach the rubber
feet to the bottom of each device. The rubber feet cushion the hub
and protect the hub case from scratching.

Rack Mounting

The hub can be mounted in an EIA standard-size, 19-inch rack,
which can be placed in a wiring closet with other equipment. Attach
the mounting brackets at the hub’s front panel (one on each side),

and secure them with the pr ovided screws.

Then, use screws provided with the equipment rack to mount each
hub in the rack.

Unpacking and Setup

Replacing the Power Supply

The hub comes with a removable power supply for easy replacement.
In the unlikely event that the power supply fails or is damaged, fol­low the steps below to replace it:

1. Disconnect the power cord from the AC outlet.

2. Disconnect the power cord from its connector on the rear of the

hub.

3. Using a Phillips screwdriver, remove the screws securing the

power supply to release the unit.

4. Remove the power supply by sliding it out the rear of the chas-

sis. Do not plug in the power supply when it is outside the
chassis! Doing so could cause personal injury or damage to the
power supply.

Unpacking and Setup 15

Dual-Speed Stackable Hubs User’s Guide

5. Slide the replacement power supply into the chassis, engaging

the connector carefully.

6. Attach the power cord to the connector of the power supply and

connect the other end of the power cord to the AC supply
source.

Unpacking and Setup 16