Accton Technology FAST ETHERHUB-12S User Manual

Fast EtherHub-12s

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Installation Manual

Fast EtherHub-12s

Smart

Fast Ethernet Hub

with 12 100BASE-TX Ports

Copyright (c) 1997 by Accton Technology Corporation. All rights reserved.

No part of this document may be copied or reproduced in any form or by any means without the
prior written consent of Accton Technology Corporation.

Accton makes no warranties with respect to this documentation and disclaims any implied
warranties of merchantability, quality, or fitness for any particular purpose. The information in this
document is subject to change without notice. Accton reserves the right to make revisions to this
publication without obligation to notify any person or entity of any such changes.

Before operating this product, please review the statements on electomagnetic emission
interference and safety compliance in Appendix D.

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No. 1 Creation Road III,
Science-based Industrial Park
Hsinchu 300, Taiwan, R.O.C.
Phone: [phone]
FAX: [phone]
BBS: 886-3-5770-654
Internet: [e-mail]

Accton, EtherHub and SmartWatch are trademarks or registered trademarks of Accton Technology
Corporation. Other trademarks or brand names mentioned herein are trademarks or registered
trademarks of their respective companies.

EH3012-TX
150114-101
E0197-R02

86$+HDGTXDUWHUV

1962 Zanker Road
San Jose, CA 95112
Phone: [phone]
FAX: [phone]
BBS: 408-452-8828
FAST FAX: [phone]

Package Contents

Carefully unpack the contents of the package and verify them against the
checklist given below.

Package Checklist

æ Fast EtherHub-12s (Model No. EH3012-TX)
æ AC power cord (optional)
æ Four rubber foot pads
æ Installation manual
æ Warranty registration card

Please inform your dealer immediately should there be any wrong, missing, or
damaged parts.

If possible, retain the carton, including the original packing materials. Use
them again to repack the unit in case there is a need to return it for repair.

To qualify for product updates and product warranty registration, fill in the

Owner Registration Card and return it to Accton Technology Corporation.

Package Contents i

Quick Installation

The Fast EtherHub-12s is a Class II repeater. It contains 12 100BASE-TX Fast
Ethernet ports. The smart design built into the front display panel provides a
friendly interface that simplifies installation and network troubleshooting. If
you are already familiar with basic network operations, you should be able to
install this hub as described below:

1. Unpack the Fast EtherHub-12s.

2. Find a location close to the network devices you need to connect, and within

easy reach of an electrical outlet.

3. Mount the hub on a desktop or any other flat surface. If you are installing

multiple hubs, you can stack them on top of each other (after attaching the
foot pads), or install them in an standard EIA 19-inch rack.

4. Connect any devices that use a standard network interface to the RJ-45

(MDI-X) station ports (e.g., a workstation, server or router). Use 100
Category 5 STP or UTP cable to connect to the hub, and be sure the length
of any twisted-pair connection does not exceed 100 meters. Refer to Chapter
3 for sample configurations.

To cascade to another hub or switch, run straight-through twisted-pair cable

from the (12MDI) daisy-chain port on this hub to any (MDI-X) station port
on the other device (or vice versa). Refer to Figure 3.2. If necessary, you
can also cascade between two station ports using crossover cable. However,
be sure not to exceed the maximum length between end nodes. Assuming
that the maximum cable length is used for end-node connections (i.e., 100
meters), then the inter-hub cabling should be limited to 5 meters. However,
if you need to extend this length of inter-hub cabling beyond 5 meters, then

W

Quick Installation iii

Fast EtherHub-12s User’s Guide

first calculate the maximum length permitted between each pair of end nodes
as described in Chapter 2 under the section on

Precise Cable Length Budgeting.

5. Verify network communications by ensuring that -

• you have made all the necessary connections

• you can access any connected resources

• the hub’s indicators are functioning properly

If you encounter any problems in installing the Fast EtherHub, refer to Chapter 2
for a detailed description of installation procedures, Chapter 3 for sample
configurations, or Appendix A for help in troubleshooting.

Note: Refer to Chapter 2 for a more detailed description of calculating the maximum cable
length permitted between two end nodes for Fast Ethernet.

iv Quick Installation

About this Guide

This guide is designed for the experienced network installer. It describes how

to install and operate Accton’s Fast EtherHub-12s. After reading this manual,
you should be able to use the front display panel and configure options to
manage all your network connections.

This manual covers the following topics:
Chapter 1 -

Brief description of Fast Ethernet, followed by a description of this hub and a
summary of its important features and specifications.

Chapter 2 ­Installing a Fast EtherHub and making basic network connections.

Chapter 3 ­Shows sample network configurations for a local area network.

Chapter 4 ­Detailed description of indicator panel and ports.

Appendices ­Troubleshooting, cable assignments, and product specifications.

Product Overview

Installing the System

Configuring the Network

Hardware Reference

About this Guide v

Contents

Chapter 1: Product Overview................................................. 1-1

Introduction to Fast Ethernet.....................................................................................1-1

Accton’s Fast EtherHub-12s......................................................................................1-1

Basic Features ...........................................................................................................1-2

Chapter 2: Installing the System............................................ 2-1

Pre-Installation Requirements ...................................................................................2-1

Connecting the Hub System......................................................................................2-2

Making a Connection via an MDI-X Station Port ................................................2-2

Making a Connection via the MDI Daisy-Chain Port...........................................2-3

Simplified Cable Length Constraints..............................................................2-4

Precise Cable Length Budgeting.....................................................................2-4

Providing Power to the EtherHub..............................................................................2-5

Verifying Port Status.................................................................................................2-6

Verifying System Operation......................................................................................2-6

Chapter 3: Configuring the Network......................................3-1

Stand-Alone...............................................................................................................3-1

Connecting Multiple Hubs ........................................................................................3-1

Using the RJ-45 Daisy-Chain Port........................................................................3-2

Precies Guidelines for Configuring Multiple Hubs ..............................................3-3

Chapter 4: Hardware Reference.............................................4-1

Front Panel ...............................................................................................................4-1

Indicators..............................................................................................................4-1

Fan Alert.........................................................................................................4-2

Power Status ...................................................................................................4-2

Statistical Display for System Performance....................................................4-3

Port Status Display..........................................................................................4-4

RJ-45 Ethernet Ports.............................................................................................4-5

Rear Panel ...............................................................................................................4-6

Power Socket........................................................................................................4-6

Contents vii

Fast EtherHub-12s User’s Guide

Appendix A: Troubleshooting................................................A-1

Diagnosing Hub Indicators........................................................................................A-1

System Diagnostics ...................................................................................................A-2

Power and Cooling Problems ...............................................................................A-2

Installation............................................................................................................A-2

Physical Configuration.........................................................................................A-3

Hub Integrity ........................................................................................................A-3

Ap p e ndix B: P ort and C a ble A s s ignmen t s.............................B-1

RJ-45 Port ...............................................................................................................B-1

Appendix C: Specifications....................................................C-1

Product Specifications...............................................................................................C-1

Appendix D: Regulatory Standards Compliance.................. D-1

EMI Certification ......................................................................................................D-1

FCC Class B Certification....................................................................................D-1

Voluntary Control Council for Interference (VCCI-2).........................................D-2

European Community Immunity Requirements....................................................D-3

CE Mark Declaration of Conformance (for EMI and Safety)...............................D-3

Safety Compliance.....................................................................................................D-4

Underwriters Laboratories Inc..............................................................................D-4

Sicherheitshinweise..............................................................................................D-5

Appendix E: Product Support Services ................................E-1

Product Registration..................................................................................................E-1

Problem Report .........................................................................................................E-1

Hardware Repair Service...........................................................................................E-1

Bulletin Board Service (BBS) ...................................................................................E-2

Interactive Fast Fax (U.S.A. office) ..........................................................................E-2

Technical Support .....................................................................................................E-3

viii Contents

Fast EtherHub-12s User’s Guide

Limited Warranty.......................................................................................................E-4

Customer Remedies..............................................................................................E-4

Return Process......................................................................................................E-5

Accton Offices...........................................................................................................E-6

Ordering Information ................................................................................................E-6

Glossary
Index

List of Figures

Figure 3.1 Stand-Alone Configuration....................................................................3-1

Figure 3.2 Multiple Hub Configuration Using the Daisy-Chain Port......................3-2

Figure 3.3 Cabling Limits for Multiple Hub Configuration.....................................3-4

Figure 4.1 Front Panel.............................................................................................4-1

Figure 4.2 Indicators ...............................................................................................4-2

Figure 4.3 Rear Panel ..............................................................................................4-6

Figure B-1 RJ-45 Connector (on the Hub Side) .......................................................B-1

List of Tables

Table B-1 RJ-45 Pin Assignments............................................................................B-1

Contents ix

Chapter 1: Product Overview

Introduction to Fast Ethernet

Standard 10 Mbps Ethernet has served well for past generations of 286 and
386 machines performing simple file transfers. However, with the inevitable
growth in corporate network size and the introduction of fully-functional 32-bit
PC architectures, and operating systems running complex applications, 10 Mbps
Ethernet has become a serious bottleneck.

With the recent flood of choices for upgrading media bandwidth, 100 Mbps
Fast Ethernet has become the most popular choice because of its low cost,
compatibility with existing Ethernet applications, and the fact that it can run on
top of an installed base of twisted-pair cabling. Fast Ethernet can be easily
integrated into an existing 10 Mbps Ethernet environment with no need for
protocol translation or changes to network software.

Accton’s Fast EtherHub-12s

The Fast EtherHub-12s includes 12 100BASE-TX Ethernet ports. It provides a
friendly design that simplifies installation and network troubleshooting. The
SmartWatch
well as Partition, Link and Traffic LEDs to ease network management.

TM

indicator panel includes Utilization and Collision rate LEDs, as

The Fast EtherHub-12s can be used to relieve common network congestion,
regardless of whether it is caused by too many stations contending for limited
bandwidth or by a server that is supporting too many users. It can significantly
improve access both to key servers and to the network backbone. This hub not
only delivers a vast improvement in network response time, but helps you
maintain outstanding performance as your user community continues to grow.

Product Overview 1-1

Fast EtherHub-12s User’s Guide

Basic Features

• Transmits data at 100 Mbps for demanding applications

• Conforms to the IEEE 802.3u repeater specification for 100BASE-TX

• Provides 12 RJ-45 100BASE-TX station ports (using MDI-X wiring)

• Port 12 can serve as an MDI-X station port (for connection to network

devices such as workstations or servers) or as an MDI daisy-chain port (for

connection to network devices such as hubs or switches), eliminating the

need for crossover cables

• Supports 100Ω Category 5 shielded or unshielded cable (STP or UTP)

• Friendly design that monitors network utilization, collisions, link and port

partition status

• LED indicator panel including Utilization and Collision rate indicators for

reporting hub activity and facilitating problem diagnosis

• Automatically partitions bad ports to protect the network system

• Automatic polarity detection and correction permits automatic adjustment

for wiring errors

• Plug-and-play operation

• An Alert LED that shows if the fan has failed

The Fast EtherHub-12s also supports the following basic system safeguards:

• This hub features automatic partitioning and reconnection, jabber lockup

protection, and automatic polarity detection for network cabling.

1-2 Product Overview

Fast EtherHub-12s User’s Guide

• With automatic partitioning and reconnection, any port is automatically

isolated if excessive collisions occur on it. When the condition is corrected,

the port is automatically reconnected.

• With the jabber lock-up function, the hub automatically stops transmission

of abnormal Ethernet frames that may cause data loss for all network users.

(Jabber refers to abnormal Ethernet frames which are much too long and

may come from a malfunctioning Ethernet card.)

• With automatic polarity detection, the hub recognizes and adjusts for

attached cable assemblies which may be wired with incorrect polarity on the

receive pair.

Product Overview 1-3

Chapter 2: Installing the System

This chapter provides information on installing the Fast EtherHub-12s, estab­lishing network connections, and configuring the system. You may install this
hub on any level surface (e.g., a table or shelf) or in a standard EIA equipment
rack. However, please take note of the following minimum site requirements
before you begin.

Pre-Installation Requirements

Before you start actual hardware installation, make sure you can provide the
right operating environment, including power requirements, sufficient physical
space, and proximity to other network devices that are to be connected. Verify
the following installation requirements:

• Power requirements: 100 to 240 VAC (± 10%) at 50 to 60 Hz (± 3Hz). The

hub’s power supply automatically adjusts to the input voltage level.

• The EtherHub should be located in a cool dry place, with at least 10 cm. of

space at the front and back for ventilation.

• Place the hub out of direct sunlight, and away from heat sources or areas

with a high amount of electromagnetic interference.

• Check if network cables and connectors needed for installation are available.

• Find a suitable location at the center of the devices you want to link, and

near a power outlet

Installing the System 2-1

Fast EtherHub-12s User’s Guide

Connecting the Hub System

This hub is a Fast Ethernet repeater for 100BASE-TX networks. The
EtherHub-12s has 12 RJ-45 station ports, of which Port 12 can serve as either a

station port or a daisy-chain port (depending on the port’s switch setting ). The
station ports allow you to make connections to dev ices such as a work station,
server or router. You can also cascade to another compatible hub or switch by
connecting an MDI port on one device (e.g., port
MDI-X port on the other device. Or you can cascade from an MDI port on
another device to any MDI-X port on this hub. See Figure 4.1.

Making a Connection via an MDI-X Station Port

You can connect an RJ-45 station port on the hub to any device that uses a
standard network interface such as a workstation or server, or also to a network
interconnection device such as a router (depending on the port type
implemented).

1. Prepare the network devices you wish to network. Make sure you have

installed suitable 100BASE-TX network interface cards for making a

connection to any of the hub’s station ports. You also need to prepare

straight-through shielded or unshielded twisted-pair cables with RJ-45 plugs

at both ends. Use 100

2. Connect one end of the cable to the RJ-45 port of the network interface card

(or comparable port type) on the device you are attaching to the hub, and the

other end to any available (MDI-X) station port on the hub. When inserting

an RJ-45 plug, be sure the tab on the plug clicks into position to ensure that it

is properly seated. Using the hub in a stand-alone configuration, you can

network up to 12 nodes.

I

Notes:

Do not plug a phone jack connector into the RJ-45 port. This may damage the hub.
Use only twisted-pair cables with RJ-45 connectors that conform with FCC standards.

1. When connecting to station Port 12, set the port selection switch to M DI-X .

2. Make sure each twisted-pair cable does not exceed 100 meters.

W Categ o r y 5 cable f o r a l l connections.

12MDI on this hub) to an

2-2 Installing the System

Fast EtherHub-12s User’s Guide

Making a Connection via the MDI Daisy-Chain Port

1. To make a direct connection to another compatible repeater or switch, use the

12MDI daisy-chain port. When connecting to this port, remember to set the

port selection switch

MDI.

2. Prepare straight-through shielded or unshielded twisted-pair cables with

RJ-45 plugs at both ends. Use 100

W Category 5 cable for all connections.

Connect one end of the cable to Port 12MDI on this hub, and the other end to

a standard MDI-X station port on the other device. When inserting an RJ-45

plug, be sure the tab on the plug clicks into position to ensure that it is

properly seated.

Notes:

1. When connecting to Port 12MD I, set the port selection switch to M D I.

2. Make sure the length of twisted-pair cable does not exceed 100 meters.

3. To connect to another hub or switch, you may also run straight-through
twisted-pair cabling from a station port on this hub to a crossover port on
another device. However, if you must connect to another device via station
ports at both ends of the cable, use crossover cabling.

Distance Limit for Fast Ethernet Cabling

There are two common ways to calculate maximum cable length. The first

way, which is refered to as the “Simplified Cable Length Constraints” method
assumes that the maximum permissible cable length is used to connect various
end-node devices (such as workstations or servers) to the hub. A more careful
method of calculating maximum cable length, referred to as the “Precise Length
Budgeting” method, requires you to measure the exact cable length for each
pair of nodes that need to communicate, and to provide the signal delay time for
each hub in your system. Both of these methods are described in this section.

Installing the System 2-3