Trendnet TE100-DX16 User Manual

TE100-DX8

TE100-DX16

Ethernet/Fast Ethernet

Dual-Speed Stackable Hub

User’s Guide

TRENDware International, Inc.

Rev. 01 (May 1998)

6ETHFE16..01

Printed In Taiwan

RECYCLABLE

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FCC Warning

This equipment has been tested and found to comply with the
regulations 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

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TABLE OF CONTENTS

0 ABOUT THIS GUIDE.......................................................... VI

Conventions ...................................................................................vi

Overview of the User’s Guide........................................................vi

1 INTRODUCTION .................................................................1

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

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

Dual-Speed Ethernet Hub Technology Overview .........................4

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

Introduction to 100-Mbps Fast Ethernet.............................................. 5

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

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

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

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

2 UNPACKING AND SETUP....................................................9

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

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

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

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

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

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

Rack Mounting..................................................................................... 13

Connecting the Power Supply......................................................14

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Dual-Speed Stackable Hub User’s Guide

3 UNDERSTANDING INDICATORS .........................................15

Hub State Indicators....................................................................16

SW Enable Indicator....................................................................16

Port Speed Indicators...................................................................17

Port Status Indicators..................................................................17

4 MAKING CONNECTIONS................................................... 19

Creating a Stack...........................................................................19

Connectivity Rules........................................................................20

Hub-to-end-node Connections......................................................21

Uplink Connection .......................................................................23

5 CABLES AND CONNECTORS.............................................27

100BASE-TX Fast Ethernet Cables and Connectors .................27

Crossover Cables ..........................................................................28

6 SPECIFICATIONS.............................................................31

General..........................................................................................31

Daisy-chain Specifications ..........................................................32

LED Indicators.............................................................................32

Environmental and Physical.......................................................32

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0 ABOUT THIS GUIDE

This guide discusses how to install and use your Ethernet/Fast
Ethernet dual-speed stackable hub.

Conventions

As used in this guide, the term hub, unless otherwise noted, refers
to the eight- or sixteen-port Ethernet/Fast Ethernet dual-speed
stackable hub with which this guide was packaged, or to another
hub in the same product family.

Overview of the User’s Guide

♦ Chapter 1, Introduction. Provides information on Fast

Ethernet networks and introduces your hub’s features.

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

setting up the hub.

♦ Chapter 3, Understanding Indicators. Describes all LED

indicators 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 ports, stacking hubs,
and uplinking hubs together.

About this Guide

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Dual-Speed Stackable Hub User’s Guide

i

♦ Appendix A, Cables and Connectors. Provides specifications

on the cables and connectors used with the hub.

♦ Appendix B, Specifications. Lists the hub’s specifications.

About this Guide

vi

Dual-Speed Stackable Hub User’s Guide

1

1 INTRODUCTION

This chapter introduces your hub and gives some background
information about the technology the hub uses.

Product Description

Your Ethernet/Fast Ethernet dual-speed stackable hub is designed
to allow easy integration and migration between 10-Mbps
Ethernet and 100-Mbps Fast Ethernet.

The hub can operate with both IEEE 802.3 10BASE-T connections
(twisted-pair Ethernet operating at 10 megabits per second) and
IEEE 802.3u 100BASE-TX connections (twisted-pair Fast
Ethernet operating at 100 megabits per second). All of the twisted­pair 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 your hub (or to a stack of hubs in the same product
family) without any rewiring required when a host is upgraded
from 10 Mbps to 100 Mbps.

Hubs in this family can be purchased with or without a built-in
switching circuit to allow communication between network end
nodes operating at different speeds. If your hub has a SW Enable
indicator on its front panel, it has such a switching circuit. On a

Introduction

1

2

hub that does not have such a switching circuit, only end nodes
operating at the same speed (10 or 100 Mbps) can communicate
with each other (unless the hub is stacked with a hub that does
have such a switching circuit—see below).

Your hub has eight or sixteen twisted-pair ports and can be
stacked together with other hubs in the same product family to a
maximum of five hubs in a stack. A stack of five sixteen-port hubs
gives a total of eighty Ethernet or Fast Ethernet ports. (Stacking
is also referred to as daisy-chaining).

As long as a stack contains at least one hub with a built-in
switching circuit, 10-Mbps Ethernet nodes will be able to
communicate with 100-Mbps Fast Ethernet nodes and vice versa,
regardless of which hub in the stack any node is attached to. Note
that if two or more hubs in a stack have switching circuits built in,
only one hub’s switching circuit will be enabled; any other
switching circuits in the stack will automatically be disabled, and
only one hub’s SW Enable indicator will shine. This is to allow
intercommunication without the danger of a signal loop forming.

Because it conforms to the standards for both Ethernet and Class
II Fast Ethernet repeaters, your hub (or a stack of hubs in the
same product family) can also be “uplinked” together with a
similarly conformant hub or hub stack to expand the network still
further. The uplink connection will carry both 10- and 100-Mbps
network signals.

Product Features

The list below highlights your hub’s features and specifications:

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

802.3u 100BASE-TX Fast Ethernet industry standards for

Introduction

Dual-Speed Stackable Hub User’s Guide

3

interoperability with other Ethernet and 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.

♦ Eight or sixteen NWay ports per hub for connecting stations

to the network.

♦ Hubs with built-in switching circuitry (shown by the

presence of a SW Enable indicator on the front panel)
automatically transfer packets between Ethernet and Fast
Ethernet connections, allowing communication between end
nodes operating at different speeds.

♦ LED indicators for power, 10-Mbps collision, 100-Mbps

collision, connection speed, port status, and (on hubs with
built-in switching circuitry only) switching circuitry status.

♦ Auto-partitioning for network protection.

♦ Data collision detection and handling.

♦ Preamble regeneration and signal retiming.

♦ Daisy-chaining ports for interconnecting up to five hubs to

form one logical hub.

♦ Uplink jack for easy linking of two hubs or hub stacks (or of

a hub to a stack) to further expand the network.

♦ Optional brackets for mounting in a standard 19-inch

equipment rack.

♦ Internal auto-adjusting power supply (100 to 240V, 50 or

60HZ).

Introduction

4

Dual-Speed Ethernet Hub
Technology Overview

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

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

10Mbps Repeate r

100Mbps Repeater

NWay Detection

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps
Ethernet

Station

10Mbps
Ethernet

Station

100Mbps

Ethernet

Station

If there is a switching circuit in the hub (or in any hub in a stack),
the switching circuit will serve as a bridge between the two
repeaters.

Introduction

5

Switching

Circuit

Dual-Speed Stackable Hub User’s Guide

10Mbps Repeater

100Mbps Repeater

NWay Detection

RJ-45 Ports

100Mbps

Ethernet

Station

100Mbps

Ethernet

Station

10Mbps
Ethernet

Station

10Mbps
Ethernet

Station

100Mbps

Ethernet

Station

100BASE-TX Technology Overview

Introduction to 100-Mbps Fast Ethernet

Computers today have become increasingly powerful, with the
capability to accommodate very sophisticated uses 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
(100 Mbps) have been adopted by many vendors. Fast Ethernet
technology stands out as the most inexpensive and smoothest
migration path for existing 10-Mbps Ethernet users in part
because it doesn’t require a protocol translation when sharing
data with 10-Mbps Ethernet.

Introduction

6

Fast Ethernet is a relatively new standard specified by the IEEE

802.3 LAN committee. It is an extension of the 10-Mbps Ethernet
standard with the ability to transmit and receive data at 100
Mbps, while maintaining the CSMA/CD Ethernet protocol. Since
Fast Ethernet is compatible with all 10-Mbps 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) and shielded twisted­pair (STP) cables are both supported. Category 5 UTP cables use
the same RJ-45 connector used with 10BASE-T, wired in the same
manner.

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 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:

• 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.

Introduction

Dual-Speed Stackable Hub User’s Guide

7

• Fast Ethernet’s increased operational speed reduces the
maximum distance between all elements of the LAN (see
below).

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 a collision domain; thus, one hub
of this type cannot be directly uplinked to another. 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, 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. Hubs in this series
are Class II devices.

Introduction

Dual-Speed Stackable Hub User’s Guide

2

2 UNPACKING AND

SETUP

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 Ethernet/Fast Ethernet dual-speed stackable hub

♦ One AC power cord, suitable for your area’s electrical power

connections

♦ One daisy-chaining cable

♦ Four rubber feet to be used for cushioning

♦ This User’s Guide

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

Unpacking and Setup

9

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Identifying External Components

This section identifies all the major external components of the
hub. Both the front and 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

The figure below shows the front panels of all hubs in the product
family that includes your hub. The two at the top are sixteen-port
units, the first with a built-in switching circuit and the second
without such a circuit; the two at the bottom are eight-port units,
the first with and the second without a built-in switching circuit.
Identify your own hub’s front panel in the figure before going on.

Unpacking and Setup

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Dual-Speed Stackable Hub User’s Guide

♦ LED Indicator Panel

Refer to the next chapter, Understanding Indicators, for

detailed information about each of the hub’s LED indicators.

♦ Twisted-pair Jacks

Use these jacks to connect stations to the hub. These are MDI-

X (Medium-Dependent Interface, Cross-wired) jacks, which
means you can use ordinary straight-through twisted-pair
cables to connect user machines and servers to the hub through
them. If you need to connect another device with an MDI-X
jack, such as another hub or an Ethernet switch, you should
use a crossover cable, or make the connection using the Uplink
jack (described below). For more information about crossover
connections, see the section entitled Crossover Cables on page

28.

♦ Uplink Jack

The Uplink jack is an MDI-II jack, which means you can connect

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

The port 1 1X jack and the Uplink jack are really the same port,

except that their pinouts are different. Do not use both the
port 1 1X jack and the Uplink jack at the same time.

Unpacking and Setup

11

2

Rear Panel

♦ Daisy Chain IN Port

When stacking your hub with one to four other hubs in the

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

♦ Daisy Chain OUT Port

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

♦ Fan

Provides air circulation and heat dissipation.

♦ AC Power Connector

For the power cord.

Unpacking and Setup

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Dual-Speed Stackable Hub User’s Guide

3

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

Appendix B, 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.

♦ Leave at least 10 cm of space at the front and rear of the

hub for ventilation.

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

its weight. 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
scratches.

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. For
information about the ETH-700I Rack Mounting Brackets, consult
your computer hardware dealer. If you already possess the
brackets, attach the mounting brackets at the hub’s front panel
(one on each side), and secure them with the provided screws.

Unpacking and Setup

1

4

Then, use screws provided with the equipment rack to mount each
hub in the rack. Follow the directions provided by the rack
manufacturer.

Connecting the Power Supply

Power is supplied to the stackable Fast Ethernet hub through an
AC power cord. The AC power input voltage ranges from 100 to
240 VAC. A power cord is included with the device.

Unpacking and Setup

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Dual-Speed Stackable Hub User’s Guide

5

3

3 UNDERSTANDING

INDICATORS

Before connecting network devices to the hub, take a few minutes
to look over this section and familiarize yourself with the front
panel LED indicators of your dual-speed hub, depicted below.

Sixteen-port hub with built­in switching circuit

Understanding Indicators

Sixteen-port hub without
switching circuit

Eight-port hub with built-in
switching circuit

Eight-port hub without
switching circuit

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6

Hub State Indicators

♦ Power Indicator

This indicator shines green when the hub is receiving power;

otherwise, it is off.

♦ Collision—10M and Collision—100M Indicators

These indicators indicate data collisions on the respective 10-

Mbps Ethernet or 100-Mbps Fast Ethernet segments of the
hub. (If several hubs are stacked or uplinked together, all of
them should detect and indicate the same collision, since
collisions span the entire network segment.) Whenever a
collision is detected, the respective collision indicator will
briefly blink amber.

SW Enable Indicator

The SW Enable indicator shows the presence of an active
switching circuit in the hub. This indicator is not present on hubs
that do not have such a switching circuit.

A switching circuit transfers signals between 10-Mbps and 100­Mbps network segments. If a stack contains more than one hub
with a built-in switching circuit, only one hub’s SW Enable
indicator will shine; the other hubs’ switching circuits will
automatically be disabled to prevent signal loops.

If a hub with a switching circuit is used alone (that is, not in a
stack), its SW Enable indicator will shine all the time, even if all
devices connected to the hub operate at the same speed.

Understanding Indicators

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Dual-Speed Stackable Hub User’s Guide

7

Port Speed Indicators

There is a port speed indicator for each of the hub’s twisted-pair
ports. A port’s speed indicator should shine green when a
100BASE-TX device is connected to the port, and remain dark if
the port is unconnected or if a 10BASE-T device is connected.

Port Status Indicators

There is one port status indicator for each of the hub’s twisted-pair
ports. When a good link to a powered-up but idle device is detected
on a port, the port’s status indicator shines steadily. When packets
are received from the device, the indicator blinks off and on.

If a powered-up device is connected to a port and the port’s status
indicator is unlit, the most probable cause is a cabling or
connection problem (for example, wrong cable type or bad contact)
or a device malfunction.

Understanding Indicators

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Dual-Speed Stackable Hub User’s Guide

4

4 MAKING

CONNECTIONS

This chapter discusses how to create a stack, connect end nodes,
and uplink two hubs (or two stacks, or a hub and a stack) together.

Creating a Stack

You can stack as many as five hubs together using the daisy­chaining ports to form one logical hub. In this configuration, the
interconnected hubs constitute a single logical unit providing a
maximum of 80 twisted-pair ports.

Never connect or disconnect a daisy-chaining cable while the
power is on to the hub or to any other hub in the stack. Always

turn off power to the entire stack before adding or
removing a hub or hubs.

Use the supplied daisy-chaining cable to connect the Daisy Chain
OUT port on the rear panel of one hub to the Daisy Chain IN port

on the hub below it, as shown in the figure below. Repeat this
procedure for each hub to be included in the stack. Note that the
first hub’s Daisy Chain IN port and the last hub’s Daisy Chain
OUT port must be left unconnected.

Making Connections

19

0

If any hub in the stack is equipped with a built-in switching
circuit, network end nodes operating at different speeds will be
able to intercommunicate; otherwise they will not. If more than
one hub in the stack has a switching circuit, only one hub’s SW
Enable indicator will light up, and that hub will provide
10-Mbps/100-Mbps intercommunication capability for all end
nodes connected to the stack.

Connectivity Rules

Ethernet (10-Mbps) networks have the following connectivity
rules:

♦ The maximum length of a twisted-pair cable segment is 100

meters. Cabling should be Category 3 or better.

Making Connections

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Dual-Speed Stackable Hub User’s Guide

♦ Between any two end-stations in a collision domain, there

may be up to five cable segments and four intermediate
repeaters (hubs, hub stacks, or other repeaters).

♦ If there is a path between any two end-stations containing

five segments and four repeaters, then at least two of the
cable segments must be point-to-point link segments (e.g.,
10BASE-T or 10BASE-FL), while the remaining segments
may be populated segments (that is, they can be 10BASE-2
or 10BASE-5 segments with end nodes attached).

Fast Ethernet (100-Mbps) networks have the following
connectivity rules:

♦ The maximum length of a twisted-pair segment (that is, the

distance between a port on the hub and an addressable
network device such as an end-station computer, server, or
Fast Ethernet switch) is 100 meters. All cabling should be
certified as Category 5 or higher UTP or equivalent (for
example, Type 1 STP with RJ-45 plugs).

♦ The maximum diameter of a collision domain is 205 meters

using two Class II hubs (or two hub stacks, or one hub and
one stack) uplinked together.

♦ Between any two end-stations in a collision domain, there

may be up to three cable segments and two Class II hubs (or
two hub stacks, or one hub and one stack).

Hub-to-end-node Connections

After the hub is properly installed, it can support up to eight or
sixteen end-node connections.

Making Connections

21

2

Each Fast Ethernet connection requires either a Category 5 UTP
cable or a Type 1 STP cable. These cables can be up to 100 meters
long.

Each Ethernet connection requires a Category 3 or better UTP
cable. It is recommended that you use Category 5 cabling for all
connections in order to make it easier to transition all stations to
100 Mbps.

You can connect any combination of end-station computers,
servers, and other addressable network devices to the twisted-pair
ports using straight-through twisted-pair cables. Do not use
crossover cables. The following figure illustrates the pin
assignments for a straight-through cable:

When connecting an end-station computer or a server, the system
being connected should have an Ethernet or Fast Ethernet
network interface card with a twisted-pair port. The following
figure shows typical connections between the hub and end nodes:

Making Connections

2

3

Uplink Connection

Dual-Speed Stackable Hub User’s Guide

You can “uplink” two hubs (or two hub stacks, or a hub and a
stack) to each other using either (a) any two numbered X-type
jacks or (b) a numbered X-type jack and an Uplink jack. (In the
discussion that follows, the word hub should be taken to mean a
hub, or a stack of hubs, in the same product family as your dual­speed Ethernet/Fast Ethernet stackable hub.)

Uplinking hubs using X-type jacks requires a crossover twisted­pair cable; uplinking hubs using an X-type jack and an Uplink jack
requires an ordinary straight-through twisted-pair cable. Inside
the hub, the Uplink and 1X jacks are wired to the same circuitry
(they are just wired to it in different ways), so you must never use
the 1X jack and the Uplink jack at the same time.

Making Connections

2

4

When you uplink two hubs together, the maximum distance
between any two end nodes in a collision domain is 205 meters. If
both hubs have maximum-length (100-meter) connections to end
nodes (even if there is only one such connection on each hub), the
hub-to-hub uplink connection will be limited to 5 meters.
However, if the longest hub-to-end-node connection is less than
100 meters, the uplink connection can be longer than 5 meters,
provided that the 205-meter total network diameter rule is
followed.

The following table describes different methods of linking hubs:

HUB PORT
USED

Normal Switch or

Uplink

DEVICE PORT

TYPE

Non-

Hub

Uplink

CABLE TO USE

Crossover (X)

Straight-through (||)

Network end node Straight-through (||)

Uplink Switch or

Hub

Uplink

Non­Uplink

Straight-through (||)

Crossover (X)

Network end node Crossover (X)

A crossover cable is a twisted-pair cable in which the wires have
been crossed. The figure below shows the pin assignments for an
Ethernet or Fast Ethernet crossover cable:

Making Connections

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Dual-Speed Stackable Hub User’s Guide

5

NOTE: The port 1 1X jack shares its circuitry with the

Uplink jack. If you connect a hub to the Up­link jack, do not use the port 1 1X jack.

Making Connections

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Dual-Speed Stackable Hub User’s Guide

7

A

5 CABLES AND

CONNECTORS

100BASE-TX Fast Ethernet Cables
and Connectors

♦ Cable characteristics: Category 5 unshielded twisted-pair or

EIA/TIA-568 compliant, 100-ohm shielded twisted-pair data
cable with 0.4 to 0.6 mm (22 to 26 AWG) wires in two or four
twisted pairs (only two pairs—that is, four wires—are used
for 100BASE-TX).

♦ Maximum segment length: 100 meters

♦ Maximum network diameter: 205 meters

♦ Connectors: RJ-45

Cables and Connectors

2

Straight Twisted-Pair Cable Pinouts

Contact MDI-X Signal MDI-II Signal

1 RD+ (receive) TD+ (transmit)
2 RD- (receive) TD- (transmit)
3 TD+ (transmit) RD+ (receive)
4 Not used Not used
5 Not used Not used
6 TD- (transmit) RD- (receive)
7 Not used Not used
8 Not used Not used

Crossover Cables

When making an uplink connection between one hub and another
(or between a hub and a switch or bridge) using X-type jacks at
both ends, you must use a crossover cable. In a crossover cable,
two pairs of wires are switched at one end. Carry out the following
steps to create a crossover twisted-pair cable:

1. Leave one end of the cable as-is, with the wiring on the

RJ-45 connector unchanged. The wiring needs to be
modified at one end only.

28 Cables and Connectors

Dual-Speed Stackable Hub User’s Guide

2. At the other end of the cable, connect wires 1 and 2 to

contacts 3 and 6, respectively. Likewise, connect wires 3 and
6 to contacts 1 and 2. Refer to the following diagram:

Cables and Connectors

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Dual-Speed Stackable Hub User’s Guide

B

6 SPECIFICATIONS

General

Standards: IEEE 802.3 10BASE-T Ethernet repeater, IEEE

802.3u 100BASE-TX Fast Ethernet repeater
(Class II); ANSI X3T9.5 twisted-pair transceiver

Topology: Star

Protocol: CSMA/CD

Network Data Transfer Rate: Fast Ethernet, 100 Mbps;

Ethernet, 10 Mbps

Number of Ports: 8 or 16, all dual-speed (10/100 Mbps)

Network Media: Ethernet: Category 3 or better UTP cable,

maximum length 100 meters; Fast Ethernet:
Category 5 UTP/STP, 100-ohm twisted-pair
(maximum length 100 meters) for hub-to­station links; Cat 5 UTP, 100-ohm UTP/STP
(maximum length 5 meters) for hub-to-hub
linking

Specifications

31

2

Daisy-chain Specifications

Number of Daisy-chained Hubs: Maximum five hubs per stack

Daisy-chain Connectors: Two D-type receptacles

Daisy-chain Cable: Proprietary cable with integral D-type

connectors (included)

LED Indicators

Hub Status: Power, 10 Mbps collision, 100 Mbps collision. Hubs

with built-in switching circuit have SW Enable
indicator.

Port Status (per port): Speed (10/100 Mbps), connection status

Environmental and Physical

Power Supply: 100 to 240 VAC, 50 or 60 Hz internal universal

power supply

Power Consumption: 8-port hubs: maximum 13.5 watts

16-port hubs: maximum 24 watts

Dimensions (W × H × D): 324 × 44.5 × 231 mm

(12.76 × 1.75 × 9.1 inches)

Weight: 2.6 kg (5.73 lb.)

Operating Temperature: -10 to 55°C

Specifications

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Dual-Speed Stackable Hub User’s Guide

3

Storage Temperature: -25 to 55°C

Humidity: 5% to 95% (non-condensing)

DC Fan: 40 × 40 × 10 mm

Emissions: FCC Class A, CE, VCCI Class A

Safety: UL, CSA, CE Mark

Specifications

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