3Com 100 TX User manual

®
L
INK
B
UILDER
®
FMS
™
100-TX H
UB
U
SER
G
UIDE
A member of the 3Com LinkBuilder FMS family
Part No.09-0889-000
Published March 1996

ii
3Com Corporation
■
5400 Bayfront Plaza
■
Santa Clara,California
■
95052-8145
© 3Com Corporation,1996.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 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 of any kind,either implied or expressed,including,but not limited to,the
implied warranties of merchantability 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.
UNITED STATES GOVERNMENT LEGENDS:
If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the
following restricted rights:
For units of the Department of Defense:
Restricted Rights Legend: Use,duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1) (ii) for
restricted Rights in Technical Data and Computer Software clause at 48 C.F.R.52.227-7013.3Com Corporation,5400 Bayfront Plaza,Santa Clara,
California 95052-8145.
For civilian agencies:
Restricted Rights Legend: Use,reproduction or disclosure is subject to restrictions set forth in subparagraph (a) through (d) of the Commercial
Computer Software - Restricted Rights Clause at 48 C.F.R.52.227-19 and the limitations set forth in 3Com Corporation’s standard commercial
agreement for the software.Unpublished rights reserved under the copyright laws of the United States.
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.If you are
unable to locate a copy,please contact 3Com and a copy will be provided to you.
Unless otherwise indicated,3Com registered trademarks are registered in the United States and may or may not be registered in other countries.
3Com, LinkBuilder, and EtherLink are registered trademarks of 3Com Corporation.3TECH, FMS, and SuperStack are trademarks of 3Com
Corporation.3ComFacts is a service mark of 3Com Corporation.CompuServe is a trademark of CompuServe,Incorporated.
Other brand and product names may be registered trademarks or trademarks of their respective holders.3Com registered trademarks are
registered in the United States and may or may not be registered in other countries.
Guide written by John Jeter.Edited by Nancy Kurahashi.Technical illustration by Tim Buckreus.Production by Becky Whitmer.

iii
C
ONTENTS
A
BOUT
T
HIS
G
UIDE
Introduction 1
How to UseThis Guide 1
Conventions 2
1
I
NTRODUCTION
General Description 1-1
Management Unit 1-3
Hub Functions 1-4
2
I
NSTALLING THE
FMS 100-TX H
UB
Unpacking the Hub 2-1
Positioning the Hub 2-2
Installing the Hub 2-2
Rack Mounting 2-3
Desktop Placement 2-5
Installing the Transceiver Interface Modules 2-5
Using the Redundant Power System 2-7
Replacing the Fuse 2-9
3
M
AKING
FMS 100-TX H
UB
C
ONNECTIONS
Making Network Connections 3-1
Hub to Node 3-2
Hub-to-Hub Interconnection 3-4
Hub to
Management Unit 3-5
Hub to Backbone 3-6

iv
Using Transceiver Interface Modules 3-6
Considerations for Multisegmented Networks 3-7
Classification of Repeaters 3-9
Class I Repeaters 3-9
Class II Repeaters 3-10
LED Descriptions 3-11
Status LEDs 3-11
Operation LEDs 3-12
Unit Digital Display 3-12
Power-Up Disabled Option Switch 3-13
4 C
ABLING
Transceiver Interface Module Cabling Requirements 4-2
Topology Rules 4-2
Hub to ConnectedWorkstations 4-2
One Class I Repeater 4-3
A
S PECIFICATIONS
Hub Specifications A-1
B
T
ECHNICAL
S
UPPORT
On-line Technical Services B-1
3Com Bulletin Board Service B-1
Access by Modem B-1
Access by ISDN B-2
World Wide Web Site B-2
3ComForum on CompuServe B-2
3ComFacts Automated Fax Service B-3
Support fromYour Network Supplier B-3
Support from 3Com B-4
Returning Products for Repair B-4
G
LOSSARY

v
I
NDEX
L
IMITED
W
ARRANTY
FCC C
LASS
A V
ERIFICATION
S
TATEMENT
CISPR A C
OMPLIANCE
CE N
OTICE

vi

vii
F
IGURES
1-1 Front Panel of LinkBuilder FMS 100-TX Hub 1-2
1-2 Rear Panel of LinkBuilder FMS 100-TX Hub 1-2
2-1 Attaching a Bracket for Rack Mounting 2-3
2-2 Rack Mounting a Single Hub 2-3
2-3 Installing a Hub Stack in a Rack 2-4
2-4 Attaching a Bracket for Desktop Placement 2-5
2-5 Transceiver Interface Modules 2-6
2-6 Connecting the Redundant Power System to Four Hubs 2-8
2-7 Opening the Fuse-holder in the AC Receptacle Assembly 2-9
2-8 Removing the Fuse 2-10
3-1 LinkBuilder FMS 100-TX Hub Supporting 11 Users and a Server 3-2
3-2 Pin Assignments for Straight-Through Cabling 3-3
3-3 RJ-45 Connector Pin Assignments 3-3
3-4 Interconnecting Two Hubs 3-4
3-5 Connecting a Hub Stack to a Management Unit 3-5
3-6 Connecting Hubs to the Network Backbone 3-6
3-7 10 and 100 Mbps Collision Domains Connected by a Switching Hub 3-8
3-8 Class I Hub 3-9
3-9 Class II Hubs 3-10
3-10 LED Indicators 3-11
3-11 Unit Digital Display 3-12
3-12 Power-Up Disabled Option Switch 3-13
4-1 Connecting the Hub to a Workstation 4-2
4-2 Connecting the Hub in a Network Span of 260.8 Meters 4-3
4-3 Using an Internetworking Device to Extend the Network Span 4-4

viii
T
ABLES
1-1 Supported IEEE 802.3 Repeater Functions 1-4
2-1 Transceiver Interface Modules 2-5
3-1 LinkBuilder FMS 100-TX Hub Network Connections 3-1
3-2 Port LEDs 3-11
3-3 Hub Operation LEDs 3-12
3-4 Settings on Power-Up Disabled Option Switch 3-13
4-1 Maximum Network Collision Domain Diameters 4-1

A
BOUT
T
HIS
G
UIDE
Introduction This guide describes how to mount the 3Com
®
LinkBuilder
®
FMS
™
100-TX Hub
in a rack,install the hub on the network,and interpret the hub’s front panel
LEDs.It also describes,in general terms,the functioning of the hub in a Fast
Ethernet network environment.
How to Use This
Guide
The following table shows where to find specific information in this guide.
If you are looking for: Turn to:
General information about the hub Chapter 1
Instructions for mounting the hub Chapter 2
Instructions for connecting the hub to the network Chapter 3
Information about interpreting LEDs Chapter 3
Information about the hub’s transceiver interface modules Chapter 3
Information about cabling requirements Chapter 4
Information on hub specifications Appendix A
Information about 3Com’s technical support services Appendix B

2 A
BOUT
T
HIS
G
UIDE
Conventions
The following table lists the notice icons that are used throughout this guide.
Icon Type Description
Information Note Information notes call attention to important features or
instructions.
Caution Cautions alert you to personal safety risk, system damage,
or loss of data.
Warning Warnings alert you to the risk of severe personal injury.