3Com 5108M-TP User Manual

®
ONline Ethernet 10BASE-T
Module
User’s Guide
Document Number 17-00141-3
Printed March 1995
Model Number: 5108M-TP
3Com Co rporation 118 Turnpike Road
U.S.A.
(508) 46 0- 8900
FAX (508) 460-8950
Federal Communications Comm ission Notice
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 i s operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to rad io communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case you must correct the interference at your own expense.
Canadian Emissions Requirements
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet apparei l numérique de la classe A respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
VDE Class B Compl ianc e
Hiermit wird bescheinigt, dass der 5108M-TP in Üebereinstimmung mit den Bestimmungen der Vfg 243/1991 funkentstöert ist.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses Geraetes angezeigt und die Berechtigung zur Üeberprüefung der Serie auf Einhaltung der Bestimmungen eingeräeumt.
Einhaltung mit betreffenden Bestimmugen kommt darauf an, dass geschirmte Ausfuehrungen gebraucht werden. Fuer die Beschaffung richtiger Ausfuehrungen ist der Betreiber verantwortlich.
This is to certify that the 5108M-TP is shielded against radio interference in accordance with the provisions of Vfg 243/1991.
The German Postal Services have been advised that this equipment is being placed on the market and that they have been given the right to inspect the series for compliance with regulations.
Compliance with applicable regulations depends on the use of shielded cables. The user is responsible for procuring the appropriate cables.
EN55022/CISPR22 Com p lian ce
This equipment conforms to the Class A emissions limits for a digital device as defin ed by EN55022 (CISPR22).
VCCI Class 1 Compliance
This equipment is in the 1st Class category (information equipment to be used in commercial or industrial areas) and conforms to the
standards set by the V oluntary Control Council for Inter fere nce by Information Technology Equipment aimed at preventing radio interference in commercial or industrial areas.
Consequently, when the equipment is used in a residential area or in an adjacent area, r adio interferenc e may be caused to radio and TV receivers, and so on.
Read the instructions for correct handling.
UK General Approval Statem en t
The ONcore Switching Hub, ONline System Concentrator, and ONsemble StackSyste m Hub are manufactur ed to the International Safety Standard EN 60950 and are approve d in the UK under the Genera l Approval Number NS/G/12345/J/100003 for indirect connection to the public telecommunication network.
Disclaimer
The information in this document is subject to change without notice and should not be construed as a commitment by 3Com Corporation. 3Com Corporation assumes no responsibility for any errors that may appear in this document.
Copyright Statement
©
1995, by Chipcom Corporation, a subsidiary of 3Com Corporation. Printed in U.S.A. All rights reserved. 3Com is a registere d trade mark of 3Com Corporat ion. ONcore is a registered trademark of Chipcom Corporation. The information contained herein is the exclusive and confidential property of 3Com Corporation. No part of this manual may be disclosed or reproduced in whole or in part without permission from 3Com Corporation.
Trademarks
Because of the nature of this material, numerous hardware and software products are mentioned by name. In most, if not all cases, these product names are claimed as trademarks by the companies that manufacture the products. It is not our intent to claim these names or tradem arks as our own.
Artel, Chipcom, Ethermo d em, Galactica, ONcore, ORnet, StarBridge, and Tr iChannel are reg ister e d tra demark s of C hipcom Corporation.
Chipcom OpenHub, G-Man, LANsentry, MultiProbe, ONdemand, ONline, ONsemble, PowerRing, SL2000, SL3000, SL4000, StackJack, StackSystem, and SwitchCentral are trademarks of Chipcom Corporation.
The Chipcom Multichannel Architecture Communications System is registered under U.S. Patent Number 5,301,303.
DEC, DECnet, the Dig ital l ogo, DELNI, POLYCENTE R, VAX , VT100, and VT220 are trademarks of Digital Equipment Corporation.
IBM is a registered trademark of Interna tional Business Machines. NetView is a trademark of International Business Machi nes.
ii ONline Ethernet 10BASE-T Module User’s Guide
XNS is a trade mark a nd Ethernet is a r egistered trademark of Xerox Corporation.
3ComFacts, Ask 3Com, CardFacts, NetFacts, and CardBoard are service marks of 3Com Corporation.
3Com, LANplex, BoundaryRouting, LanScanner, LinkBuilder, NETBuilder, NETBuilderII, ParallelTasking, ViewBuilder, EtherDisk, Etherl\Link, Ether Link Plus, EtherLink II, T ok enLink, T okenLink Plus, and TokenDisk are registered trademarks of 3Com Corporation.
3ComLaser Library, 3TECH, CacheCard, FDDILink, FMS, NetProbe, SmartAgent, Star-Tek, and Transcend are trademarks of 3Com Corporation.
CompuServe is a registered trademark of CompuServe, Inc. 3Com registered trademarks are registered in the United Stat es,
and may or may not be register ed i n other countrie s. Other brand and product names may be reg istered tradema rks or trademark s of their respective holders.
Restricte d Righ ts
Use, duplication, or disclosure by the Government is s ubject to restrictions as set forth in subparagraph (c)(1) (ii) of the Rights in Technical Data and Compu ter Software clause at DFARS 252.227-7013.
Printed on recycled paper.
ONline Ethernet 10BASE-T Module User’s Guide iii
iv ONline Ethernet 10BASE-T Module User’s Guide
How to Use This Guide
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii i
Structure of This Guid e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiv
Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Related D ocuments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvi
3Com Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii
Chapter 1 — Introduction
The ONline Ethernet 10BASE-T Module . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Dip Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Dip Switch SW1 (Port Status) . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Dip Switch SW3 (Crossover Mode, Channel Select, Squelch) . . . . 1-6
Dip Switch SW6 (Link Integrity ) . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Related Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -10
LED and Channel Verification . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
The ONline Ethernet Network Management Mod ule . . . . . . . . . 1 -11
Contents
Chapter 2 — Designing and Expanding the Network
Understanding th e General Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Basic Network Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
LAN Equivalence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Fiber Backbone, Twisted Pair To-The-Desk . . . . . . . . . . . . . . . . . . . . . . . 2-7
Fiber Backbone, Twisted Pair To-The-Desk Example . . . . . . . . . . . 2-8
Twisted Pair Backbone, Twisted Pair To-The-Desk . . . . . . . . . . . . . . . . . 2-11
Redundant Links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -12
Patch Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
ONline Ethernet 10BASE-T Module User’s Guide v
Chapter 3 — Installing and Operating the Modu le
Precautionary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Chapter 4 — Troubleshooting
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Troubleshooting W ith the Status LEDs . . . . . . . . . . . . . . . . . . . . . . . 4-1
Troubleshooting W ith the Activity LEDs . . . . . . . . . . . . . . . . . . . . . . 4-5
Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Appendix A — Specifications
ONline Ethernet 10BA S E-T Module Spec ific ations . . . . . . . . . . . . . . . . . . A-1
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Environmental Spec ific ation s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2
Mechanical Specificatio ns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2
Twisted Pair Connectors and Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Twisted Pair Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3
Twisted Pair Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Connecting Twi sted P air Cable s . . . . . . . . . . . . . . . . . . . . . . . . .A-5
Appendix B — Technical Support
On-line Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Email Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
World Wide Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Support from Your Netw ork Sup plier . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Support from 3Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Returning Produ cts for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Accessing the 3Com MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
3Com Technical Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5
Index
vi ONline Ethernet 10BA SE-T Module User’s Guide
Figures
Figure 1-1. 10BASE-T Module Faceplate and ONline
Figure 1-2. 10BA S E-T Module and Dip Switc h Lo catio ns . . . . . . . . . . 1-5
Figure 2-1. Sample Conf iguration Distance Calculation . . . . . . . . . . . 2-9
Figure 2-2. Unshielded Twisted Pair Network . . . . . . . . . . . . . . . . . 2-11
Figure 2-3. Redundant Tw isted Pair Conf igu ration . . . . . . . . . . . . . 2-12
Figure 3-1. Installing a 10BA SE-T Modu l e . . . . . . . . . . . . . . . . . . . . . 3-3
Figure 3-2. 10BA S E-T Module Cable Co nn ectio n . . . . . . . . . . . . . . . 3-4
Figure A-1. RJ45 Connecto r Pin-out s . . . . . . . . . . . . . . . . . . . . . . . . .A-4
System Concentrato r . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
ONline Ethernet 10BASE-T Module User’s Guide vii
viii ONline Ethernet 10BASE-T Module User’s Guide
Tables
Table 1-1. Interpretation of the 10BASE-T Modu le LEDs . . . . . . . . . . 1-4
Table 1-2. Dip Switch SW1 Settings and Interpret ations . . . . . . . . . . 1-6
Table 1-3. Dip Switch SW3 Settings for Switches 1 and 4. . . . . . . . . 1-7
Table 1-4. Dip Switch SW3 Settings and Interpretation s for
Switches 2 and 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Table 1-5. Dip Switch SW6 Settings and Interpret ations . . . . . . . . . 1-10
Table 1-6. Channel Check Codes . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -11
Table 2-1. Seven Basic Network Rules. . . . . . . . . . . . . . . . . . . . . . . . 2-3
Table 2-2. LAN Produc t Equi valent Distance s . . . . . . . . . . . . . . . . . . 2-6
Table 2-3. Maximum Link Distance on Twisted Pair. . . . . . . . . . . . . 2-10
Table 4-1. Troubleshooting With the Port Status LEDs . . . . . . . . . . . 4-2
Table 4-2. Troubleshooting With the Port Activ ity L EDs . . . . . . . . . . . 4-5
ONline Ethernet 10BASE-T Module User’s Guide ix
The ONline™ Ethernet 10BASE-T Module User’s Guide describes the features, indicators, and installation procedures for the O Nline Ethernet 10BASE-T Module. Information on troubleshooting and diagnostics is included for verifying operation. This guide also contains a configuration section which will be helpful when you plan your netwo rk configuration.

Audience

This guide is intended for the following people at your site:
How to Use This Guide
Network manager or administrator Hardware installer
ONline Ethernet 10BASE-T Module User’s Guide xi

Structure of This Guide

This guide contains the following chapters: Chapter 1, Introducti on –Introduces the principal features of the ONline
Ethernet 10BASE-T Module and provides views and descriptions of the front panel and the dip switches on the module.
Chapter 2, Designing and Expanding the Network – Shows and explains examples of possible network configurations using the ONline System Concentrator and the ONline Ethernet 10BA SE- T M od ule. These examples include both shielded and unshielded twisted pair configurations.
Chapter 3, Install ing and Operating the Module – Provides illustrated procedures for installing the 10BASE-T Module into the ONline System Concentrator.
Chapter 4, Troubleshooting –Provides help in isolating and correcting problems that may arise during the installation process and during normal operation.
Appendix A, Specifications – Provides electrical, environmental, and mechanical specifications, as well as other information for the module.
Appendix B, Technical Support – Lists the various methods for contacting the 3Com technical suppor t organization and for accessing other product support services.
Index
xii ONline Ethernet 10BASE-T Module Us er’s Guide

Document Conventions

The following document conventions are used in this manual:
Convention Indicates Example
Courier text User input In the Agent Information Form,
System output After pressing the Apply
enter MIS in the New Contact field.
button, the system displays the message Transmi tt in g da ta .
Bold command string
Italic text in braces User-substituted
Capitalized text in plain brackets
Italics Text emphasis,
Path names Before you begin, read the
identifiers
Keyboard entry by the user
document titles
readme.txt file located in /usr/snm/agents.
Use the following command to show port details:
SHOW PORT {
Type your password and press [ENTER].
Ensure that you press the Apply button after you add the new search parameters.
slot
.all} VERBOSE
ONline Ethernet 10BASE-T Module User’s Guide xiii
Convention Indicates Example
Note: A Note. The
Caution: A Caution. A
Warning: A Warning. A

Related Documents

This section provides in formation on supporting documentation, including:
3Com Documents
information is important
condition may damage software or hardware
condition may threaten personal safety
Note: Use STP lobe cables for your system.
Caution: Do not put your installation diskettes on a magnetic surfac e. This may damage the diskettes.
Warning: Wear eye protection when performin g these maintenance procedures.
Reference Documents
xiv ONline Ethernet 10BASE-T Module User’s Guide

3Com Documents

The following documents provide additional information on 3Com products:
17-Slot ONlin e System Concen trator Ins tallatio n and O pera tion Guide – Explains how to install, operate, and manage the 3Com ONline
17-Slot System Concentrator (Models 5017C-LS and 5017C with load sharing).
6-Slot ONline System Concentrator Installation and Operation Guide – Explains ho w to install, operate, and manage the 3Com ONline
6-Slot System Concentrator. ONline Ethernet Management Module Installation and Operation Guide
Describes how to install the ONline Ethernet Network Management Module in the ONline System Concentrator and explains the LEDs on th e module faceplate. This guide also provides instructions for connecting a terminal to the module and describes the man agement commands necessary to perform management tasks on the concentrator and on remote devices.
ONline Management Commands Guid e – Provides an alph abetized reference resource describing all ONline management commands.
For a complete list of 3Com documents, contact your 3Com representative.

Reference Documents

The following documents supply related background information:
Case, J., Fedor, M., Scoffstall, M., and J. Davin, The Simple Network Management Protocol, RFC 115 7 , University of Tennessee at Knoxville,
Performance Systems International and the MIT Laboratory for Computer Science, May 1990.
Rose, M., and K. McCloghrie, Structure and Identification of Management Information for TCP/IP-based Internets, RFC 1155,
Performance Systems International and Hughes LAN Systems, May 1990.
ONline Ethernet 10BASE-T Module User’s Guide xv
Introduction
1
This chapter describes the features, indicators, and dip switch settings on the ONline™ Ethernet 10BASE-T Module.

The ONline Ethernet 10BASE-T Module

The ONline™ Ethernet 10BA SE-T Modu le is an eight-port IEEE 802.3 repeater module that complies with the 10BASE-T standard. This module works with the 3Com ONline System Concentrator using both unshielded and shielded twisted pair wiring. The ONline 10BASE-T Module provides the following features and benefits:
supports up to 150 meter link distances on 22 gauge wire, up to 125
meters on 24 gauge wire, and up to 100 meters on 26 gauge wire
supports up to 200 meter link distance on IBM Type 1 cabling complies fully with the 10BASE-T standard features “hot swap” capability so that you can install or remove the
module wit hout having to power down the concentr at or
The 10BASE-T Mod ule works with both unshielded and shielded twisted pair wire. A single module can support any mix of shielded and unshielded twisted pair connections. For example, ports 1, 2, and 6 can be unshielded
Introduction 1 - 1
twisted pair connections while ports 3, 4, 5, and 7 are shielded twisted pair connections.
In addition to complying with the 10BASE-T standard, each port provides support for features that are beyond the scope of the 10BASE-T standard:
Before installing the Ethernet 10BASE-T Module, read the ONline System
Concentrator In stallation and Operation G uide.

Indicators

The 10BASE-T Module has eight Activity and eight Status LEDs on the front panel that indicate the state of each port on the module. Figure 1-1 shows the locations of these indicators and T able 1-1 describes how to read them.
supports shielded twisted pair cable allows Low Squelch level (which significantly increases achievable link
distances)
allows Link Integrity to be disabled (which allows connection to some
equipment which does not conform to the 10BASE-T standard)
1 - 2 ONline Ethernet 10BASE-T Module User’s Guide
Figure 1-1. 10BASE-T Module Faceplate and ONline
System Concentrator
Introduction 1 - 3
Table 1-1. Interpretation of the 10BASE-T Module LEDs
LED Name Color State Indicates
Activity (Ports 1-8)
Status (Ports 1-8)
yellow Off No packets are received on
the segment.
On Constant activity on the
segment.
Blinking Normal activity on the
segment.
green Off Port disabled.
On Port enabled and Link
Integrity is functional. 1 blink Link Integrity error. 2 blink s Jabber error or port
partition ing. Timed blinks (LED
is on for 10 seconds, blinks off for 400 msecs)
Link Integrity disabled for
this active port.

Dip Switches

The 10BASE-T Mod ule has three dip switches located on the module:
8-switch dip switch (SW1) 4-switch dip switch (SW3) 8-switch dip switch (SW6)
1 - 4 ONline Ethernet 10BASE-T Module User’s Guide
Configure the switches to th e settings you want if different than the default values. (Refer to Table 1-2, T able 1-3, T able 1-4, and T able 1-5 for an explanation of the dip switch settings.) Figure 1-2 shows the location of the dip switches.
Figure 1-2. 10BASE-T Module and Dip Switch Locations

Dip Switch SW1 (Port Status)

The eight switches on dip switch SW1 allow you to enable or disable each of the eight ports. The switches are labeled 1 through 8 and correspond to the respective eight ports. The Off position disables the port and the On position enables the port. The switch settings are initially configured in the
Introduction 1 - 5
On position, therefore, all ports are initially enabled. T able 1-2 describes the settings and functions for switches 1 through 8.
Table 1-2. Dip Switch SW 1 Settings and Interpretations
Switch Function
Factory Default
Switch Setting
Off On
1 - 8 Enable/disable port enable disable enable
If you have an ONline Ethernet Network Management Module installed in your concentrator , you can remotely override these switch settings. Refer to the ON line Ethernet Network Management Module Installation and Operation Guide for informatio n on remotely managing the ports.
Dip Switch SW3 (Crossover Mode, Channel Select, Squelch)
The four switches on dip switch SW3 allow you to:
set port 8 to uncrossed mode select a channel for the module set the Squelch level to high (normal) or low (sensitive)
The switches are labeled 1 through 4 and the settings affect all eight ports. Switch 1 allows you to enable or disable crossover mode for port 8. The channel is initially configured for channel 1 (default) and Squelch level is initially configured for high (default). The following sections explain the crossover, channel selection, and Squelch mode.
If you have an ONline Ethernet Network Management Module installed in your concentrator, you can remotely overri de these switch settings.
1 - 6 ONline Ethernet 10BASE-T Module User’s Guide
Table 1-3 explains crossover mode and squelch mode switch settings and the sections following the table explain these features in more detail. The channel selection switches are discussed in Table 1-4.
Table 1-3. Dip Switch SW 3 Settings for Switches 1 and 4
Switch Function
1 Enable/disable
crossover mode for port 8 only
4 Squelch mode high low high
Crossover Mode Switch
All eight ports on the 10BASE-T Module are internally crossed over as per 10BASE-T standard. This enables the 10BASE-T Module to be connected to a 10BASE-T Transceiver. Port 8, however, can be uncrossed using the crossover mode switch to connect the 10BASE-T Module directly to another 10BASE-T Module without the need for an external crossover adapter . One port must be crossed over and the other port (port 8) must be uncrossed when connecting a 10BASE-T Module to another 10BASE-T Module. If both ports are crossed, you must use an external crossover adapter to provide a proper connection.
The Off position disables crossover mode (uncrosses) and the On position enables crossover mode (default), therefore, port eight is initially crossed over .
Factory Default
enable disable
Switch Setting Off On
(uncrossed)
enable (crossed)
Squelch Mode Switch
The Squelch mode switch allows you to set the Squelch level to high (normal) or low (sensitive). The On position sets the Squelch level to high (default). The High Squelch level conforms to the proposed 10BASE-T standard. In general, 3Com recommends using Hig h Squelch.
Introduction 1 - 7
The Off position sets the Squelch level to low. When the Squelch level is set to low , the ports are able to r eceive weaker signals. Note that Low Squelch mode does not conform to the 10BASE-T standard. If you change the module's Squelch level to low, you must change the 10BASE-T T ransceiver Squelch level to low also. Refer to the ONlin e Ethern et 10BASE-T Transceiver Installation Guide for information on setting the transceiver Squelch level.
On unshielded twisted pair cable, setting the Squelch level to low increases the achievable link distance by approximately 25% to 50%, but with the added risk of losing packets to impulse noise. Do not use Low Squelch mode if your network should experience too many illegally short packets (runts). This problem will occur if there is significant external noise ar ound the link.
Setting the Squelch level to low in conjunction with shielded twisted pair wiring increases the achievable link distan ce without sacrificing noise immunity. Thus, there is no real drawback in using Low Squelch on shielded twisted pair.
To gain the extended link distance achieved by using Low Squelch mode, you must use qualified data grade shielded twisted pair cable or qualified high performance unshielded cable. IBM Ty pe 1 shielded cable (with an appropriate RJ45 to Type 1 connector), among others, meets this requirement. If you are unsure of the grade of twisted pair cable to use, set the Squelch level to high, or call 3Com for a list of qualified cables to use in extended distance applicat ions.
Channel Select Switch Settings
The ONline Ethernet 10BASE-T Module is equipped with the technology to work with the ON line System Concentrator's uniqu e TriChannel™ architecture. This feature allows you to assign the module to any of three channels (or none) on the ONline System Concentrator backplane. Refer to Chapter 1 in the ONline System Concentrator Installation and Operation Guide for a co mplete discussion of ONline's TriChannel architecture.
The channel select switch settings (switches 2 and 3) on dip switch SW3 let you select a channel. Switches 2 and 3 are factory set to On, therefore, the
1 - 8 ONline Ethernet 10BASE-T Module User’s Guide
10BASE-T Mod ule is initially configured to channel 1. To recon figure the module to a different channel, refer to the information in Table 1-4.
Table 1-4. Dip Switch SW3 Settings and Interpretations for
Switches 2 and 3
Switch 2 Switch 3 Channel Selection
Switch Setting On On 1 (default)
On Of f 2 Off On 3 Off Off Isolated (module
operates independent of any channel)
If you have an ONline Ethernet Network Management Module installed in your concentrator, you can remotely overri de these switch settings.

Dip Switch SW6 (Link Integrity)

The eight switches on dip switch SW6 allow you to enable or disable Link Integrity for each port. The switches are labeled 1 through 8 and correspond to the eight ports. The On position enables Link Integrity for each port (default) and the Off position disables Link Integrity for each port. The switch settin gs are init ially configured in the On posi tion, therefore, all eight ports have Link Integrity enabled, as per the 10BASE-T standard.
In general, you should enable Link Integrity . To conform to the 10BASE-T standard, for example, a connection requires Link Integrity to be enabled. Y o u must disable Link Integrity to connect to older equipment which does not conform to the 10BASE-T standard. Link Integrity must either be enabled at both ends of the link or disabled at both ends or the module will report a Link Integrity error.
Introduction 1 - 9
If you enable a port and disable Link Integrity, the Status LED is on for 10 seconds and blinks off for 400 msecs to indicate that Link Integrity is disabled.
Table 1-5 lists the settings and functions for switches 1 through 8.
Table 1-5. Dip Switch SW 6 Settings and Interpretations
Switch Function
1 - 8 Enable/disable link integrity enable disable enable
If you have an ONline Ethernet Network Management Module installed in your Concentrator, you can remotely override these switch settings.

Related Features

The following sections describe functions which allow you to:
check the module's channel assignment and LED functionality remotely manage the 10BASE-T Module

LED and Channel Verification

The ONline Controller Module is equipped with an LED/Channel Check button on the front panel. The LED/Channel Check button has two functions: it causes all LEDs in all modules in the concentrator to light and it causes each module to identify the channel to which it is assigned. When you activate this button, it causes all module LEDs to light for approximately five seconds. Any LED that does not light is defectiv e.
Factory Default
Switch Setting
Off On
After the five seconds elapse, the diagnostic continues with a channel check of all modules. This channel check causes each module's Status LEDs to blink a number of times corresponding to the channel to which it is
1 - 10 ONline Ethernet 10BASE-T Module User’s Guide
assigned. The channel check sequence repeats five times. T able 1-6 explains the channel check codes.
Table 1-6. Channel Check Codes
LED Stat e Channe l Co n figuration
1 Blink Module is config ured for channel 1 2 Blinks Module is configured for channel 2 3 Blinks Module is configured for channel 3 Off Isolated (module operates independent of any
channel)
The LED/Channel Check button and the Controller Module are explained in more detail in the ONline Controller Module Installation Guide.

The ONline Ethernet Network Management Module

The ONline Network Manag ement Module provides remote network management capabilities for the ONline System Con centrator and its modules. The Management Module can also remotely override the following dip switch settings of the 10BASE-T Modu le:
enable/disable each port
(SET PORT 6.5 MODE ENABLE)
enable/disable Link Integrity for each port
(SET PORT 3.2 LINK_INTEGRITY ENABLE)
set Squelch to high level o r low level per port
(SET PORT 5.1 SQUELCH LOW)
enable/disable crossover mode for port 8
(SET MODULE 5 CROSSOVER DISABLE)
Introduction 1 - 11
change channel selectio n (per module)
(SET MODULE 4 CHANNEL 2)
The ONline Ethernet Management Module allows you to set redundancy between the ports. Refer to Redundant Links in Chapter 2 for an example of setting redundancy between concentrators using 10BA SE-T Modules.
Refer to the ONline Ethernet Network Management Module In st allation and Operation Guide for additional information on the Network Management features.
1 - 12 ONline Ethernet 10BASE-T Module User’s Guide
2
Designing and Expanding the Network
This appendix con tains configuration information that will help you to design your network. Install all equipment using only approved cables for proper operation. Refer to Appendix A in the T wisted Pair Connectors and Cables section for in formation on twisted pair connector and cab le requiremen ts.
This appendix describ es how to configu re you r network with the O Nline System Concentrator and the ONline Ether net 10BASE-T Module. It also provides examples of alternative network cabling structures and rules for configuring Ethernet networks. There are five sections:
Network Diamet er Calculations: General Rules Fiber Backbone, Twisted Pair To-The-Desk Twisted Pair Backbon e, Twisted Pair To-The-Desk Redundant Links Patch Panels
Designing and Ex panding the Network 2 - 1

Understandi ng the General Rules

As part of your network design, it is important to consider your netwo rk size. For instance, is the network (end-to-end) 100 meters, 1000 meters, 4000 meters, or more? What are your plans for expansion? Y our answers play a role in how you configure your network. For exam ple, once the network expands beyond a certain size, you need to add a bridge or other internetw orking device.
This section describes general rules for configuring an Ethernet network using fiber as the backbone medium. It also provides rules to ensure that your network configuration conforms to distance limitations imposed by Ethernet and networking equipment.
This section includes:
Basic Network Rules LAN Equivalence

Basic Network Rules

This section outlines the basic network rules and 3Com recommendations for these rules. For more hardware-specific information on the 10-Port module, refer to Appendix A.
2 - 2 ONline Ethernet 10BASE-T Module User’s Guide
T able 2-1 outlines the seven basic rules to keep in mind when you construct your network.
Table 2-1. Seven Basic Network Rules
Rule Definition Recommendations/Notes
1 If possible, use
10BASE-FB as the backbone medium.
2 Wire the backbone in
a star topology to isolate faults.
3 The maximum Fiber
Ethernet network diameter is 4200 meters of fiber cable.
Use 62.5 micron cable to conform with the IEEE 10BA SE-F and upcoming ANSI FDDI standards.
Use ST-type connect ors. Make sure to lay extra fiber cables.
The extra cost is small and you will find you need them as your network grows.
The star topology conforms to FDDI wiring as well -- ju st make sure to run at least two fiber strands to every backbone connection.
The 4200 meters is the maximum distance between any two transceivers on the network.
The 4200 meters does not include the transceiver cable (that is, drop or patch cable) that connects a device with an external transceiver. T ransceiver cables can extend up to 50 meters. Thus, total network diameter can be as much as 4300 meters (4200 m + 2 * 50 m) between any two nodes.
Designing and Ex panding the Network 2 - 3
Table 2-1. Seven Basic Network Rules (Continued)
Rule Definition Recommendations/Notes
4 Certain LAN devices
on the network shrink the maximum Fib er Ethernet network diameter to less than 4200 meters.
5 Assume that one
meter of coaxial or twisted pair is equal to one meter of fiber cable.
Many LAN products delay the signal that goes through them. This is known as equivalent distance. Every microsecond delay reduces the maximum link distance . In fact, every microsecond delay shrinks the network diameter by approximately 200 meters of fiber cable. Table 2-2 lists the Equivalent Distances for other 3Com products.
This is a conservative rule of thumb. For example, the actual equivalence is about 1.1 meters of coaxial for every meter of fiber. For simplicity, assume one meter.
2 - 4 ONline Ethernet 10BASE-T Module User’s Guide
Table 2-1. Seven Basic Network Rules (Continued)
Rule Definition Recommendations/Notes
6 The fiber link distances
must not exceed the limits imposed by the optical power budget.
7 When in doubt, use a
bridge.
In general, on 62.5 micron cable, you can go up to 4000 meters point-to-point using the ONcore or ONline Fiber Modules. If you have poor quality cable or cross many patch panels, you may have to sacrifice some distance .
Some older Ethernet fiber optic products are less powerful than ONcore Fiber Module optics. So when connecting to these products, remember that the least powerful device determines the maximum point-to-point distance.
If you are not certain if you have exceeded allowable network distances, use a bridge to extend the network.
Designing and Ex panding the Network 2 - 5

LAN Equivalence

LAN equivalenc e is the sum of both the incoming and outgoing module port signals. Different modules, however, have different equivalent distances. Table 2-2 lists the LAN product equivalent distances.
Table 2-2. LAN Product Equivalent Distances
LAN Product
ONcore Ethernet 10-Port 10BASE-FB Module 190
Incoming sig nal to fiber port 140 Outgoing signal from fiber port 50
ONcore Ethernet 10BASE-T Module 585
Incoming signal to TP port 420 Outgoing signal from TP port 165
ONline Ethernet 10BASE-T M odules 585
Incoming signal to TP port 420 Outgoing signal from TP port 165
ONline Ethernet Fiber or 10BASE-FB Modules 190
Incoming sig nal to fiber port 140 Outgoing signal from fiber port 50
ONline Ethernet FOIRL Module 560
Equivalent
Distance (meters)
Incoming sig nal to fiber port 330
Outgoing signal from fiber port 230 ONline Ethernet Transceiver Module 0 10BASE-FB Star Coupler (8 or 14 port) 26 180
2 - 6 ONline Ethernet 10BASE-T Module User’s Guide
Table 2-2. LAN Product Equivalent Distances (Continued)
LAN Pr o duct
ONline Ethernet BNC Module 900
Incoming signal to BNC port 450 Outgoing signal from BNC por t 450
ONline Ethernet Repeater Module 800
Incoming signal to AUI port 600 Outgoing signal from AUI port 200
IEEE Repeater 800
Distance (m eters)

Fiber Backbo n e, Twisted Pair To-The-Desk

When you confi gure a netwo rk with unshielded or shielded twisted pair cabling to-the-desk and fiber for the backbone, there are only three additional rules you need to be aware of:
Equivalent
There can be no more than eight 10BASE-T Modules (5108M-TP) in
the path between any two transceivers due to Ethernet's four -repeater rule (each 10 BASE-T Module counts as a 1/2 repeater). You must add a bridge if you have more than eig ht 10BASE-T Modules serially connected.
There is an equivalent fiber distance for the ONline Fiber Modules
(see Rule 4). The equivalent is: – 140 meters for signals that externally enter a Fiber Module
port
50 meters for signals that internally enter a Fiber Module
via the ONline Concentrator backplane
Designing and Ex panding the Network 2 - 7
There is an equivalent fiber distance for the 10BASE-T Modules (see
Rule 4). The equivalence is: – 420 meters for signals that externally enter a 10BASE-T
Module port
165 meters for signals that internally enter a 10BASE-T
Module via the ONline Concentrator backplane
Thus, for every pair of 10BASE-T Modules that a signal goes through, ther e is a fiber equivalent distance of 585 meters (420 m + 165 m = 585 m). This is also true if a signal makes a r oundtrip through a single 10BASE-T Module, i.e., enters a 10BASE-T port externally and exits through another port on the same 10BASE-T Module. This counts as 585 meters of fiber equivalent distance, and as a full repeater.

Fiber Backbone, Twisted Pair To-The-Desk Example

In the sample configuration shown in Figure 2-1, we determine if the transceivers are within legal Ethern et limits. This example is applicable to both unshielded and shielded twisted pair cables. Note that 22 gauge unshielded twisted pair cable is used to connect 10BASE-T Transceivers to the 10BASE-T Modules in the concentrators.
The first step is to identify the two transceivers that are likely to be the greatest fiber equivalent distance apart. In this case, they are 10BASE-T Transceivers A and B.
2 - 8 ONline Ethernet 10BASE-T Module User’s Guide
.
Figure 2-1. Sample Configuration Distance Calculation
Use the following steps to determine whether your network configuration is legal:
1. Begin with 4.2 km (4200 m) since th is is the maximum networ k diameter for a pure fiber network (Rule 3).
2. Subtract 100 m for t he signal exiting the Fiber Modules in concentrators A and C (2 * 50) and 280 m for the signal entering the Fiber Modules in concentrators C and B (2 * 140) as explained in Rule 4 and defined in Table 2-2.
3. Subtract 420 m of fiber equivalent distance for the signal entering the 10BASE-T Module in concentrator A and 165 m for the signal exiting the 10BASE-T Mod ule in concentrator B (Rule 4).
4. Subtract all cable lengths between the two transceivers and if t h e result is greater than zero, the configuration is within legal Ethernet limits (Rule 5).
Designing and Ex panding the Network 2 - 9
For the configuration shown in F igure 2-1 to work, the fiber equivalent distance between transceiver A and transceiver B must be less than 4200 meters. As you can see in the calculation, there are still 1510 meters left for expansion in this configuration.
Be aware that the link from a 10BASE-T Module to a 10BASE-T T ransceiver should not exceed the distances as defined in Table 2-3. In th is example, the link cannot exceed 150 meters, using the 10BASE-T standard High Squelch mode and 22 gauge wire.
Table 2-3. Maximum Link Distance on Twisted Pair
Cable Gauge Support s Link Distances Up To:
Unshielded T wisted Pair: 10BASE-T
22 (.6mm) 150m 200m 24 (.5mm) 125m 150m
Shielded Twisted Pair: IBM Type 1
22 (.6mm) 200m 300m
In areas of low noise, the Squelch level can be low ered to accept weaker signals. (Low Squelch does not con form to the 10BASE-T standard.) This allows the acceptable link distance to increase to 200 meters. The 10BASE-T standard limits link distance to approximately 200 m eters (equivalent to 1
µsec of delay) on unshielded twisted pair.
10BASE-T signaling can also be used on shielded twisted pair even though the standard does not include shielded twisted pair in its specificat ion. Since external noise does not affect signals on shielded twisted pair , there is no restriction in using the Low Squelch level. Using Low Squelch on shielded twisted pair allows link distances of up to 300 meters. Nevertheless, 3Com recommends that you always use the High Squelch setting except in situat ions where the link distance exceeds 200 meters.
High Squelch Low Squelch
High Squelch Low Squelch
2 - 10 ONline Ethernet 10BASE-T Module User’s Guide

Twisted Pair B ackb one, Twisted Pair To -Th e-Des k

In constructing a twisted pair backbone, one additional configuration rule must be considered:
There can be no more than eight 10BASE-T Modules in the path
between any two transceivers due to the Ethernet four -repeater rule (each 10BASE-T Module counts as a 1/2 repeater). Y ou must add a bridge if you have more than eight 10BASE-T Modules serially connected.
The configuration in Figure 2-2 illustrates a possible unshielded twisted pair network using 2 2 gauge cable.
Figure 2-2. Unshielded T wiste d Pair Network
Note that when connecting two concentrators with twisted pair cable, use port 8 on one of the 10BASE-T Modules and disable crossover mode for that port. This allows a direct connec tion to another 10BASE-T Mod ule without the need for an intervening adapter. (Refer to Dip Switch SW3 (Crossover Mode, Channel Select, Squelch) in Chapter 1 for information on crossover mode and the crosso ver mode switch setting. )
Designing and Expanding the Network 2 - 11
While there is no fiber in this configuration, the fiber equivalent distance can be calculated a s follow s :
Total link distance: 150 m + 100 m + 100 m + 50 m + 20 m = 420 m Total equivalent distance of 10BASE-T Modules:
4 * 420 m + 4 * 165 m = 2340 m (signal externally enters four 10BASE-T Modules: 4 * 420 m) (signal enters four 10BASE-T Modules from the backplane: 4 * 165 m)
Total equivalent distance: 420 m + 2340 m = 2760 m
Since the total equivalent distance (2760 m) is less than 4200 meters, this is a legitimate configuration.
Note that if shielded twisted pair cabling is used, each link in the network could run up to 300 meters using Low Squelch (refer to Dip Switch SW3 (Crossover Mode, Channel Select, Squelch) in Chapter 1 for information on Squelch levels and the Squelch d ip switch setting). Low Squelch is acceptable for all shielded twisted pair applications since external noise is not a problem.

Redundan t Lin ks

You can implement twisted pair link redundancy between ONline System Concentrators using Network Management. Figure 2-3 below shows an example of a redundant configuration between concentrators using 10BASE-T Modules.
Figure 2-3. Redundant Twisted Pair Configuration
2 - 12 ONline Ethernet 10BASE-T Module User’s Guide
To set redundancy between two 10BASE-T Modules, connect two links between the modules. The redundant link must be connected to a port on the same 10BASE-T Module as the primary link. Use a crossover adapter between each link unless you choose to uncross port 8 on one of the modules to make the connection. Refer to Chapter 1 for inf ormation on using crossover mode. Then use the SET PORT <slot.port> MOD E REDUNDANT <slot.port> command to specify which port is the primary link and which is the backup link.
Note: If the 10BASE-T Modules are powered down, and then
brought back up without the Ethernet Man agement Module present, a network loop could occur. To prevent a potential failure, 3Com advises that you disable the Port Enable dip switch setting for the backup port on one of the 10BASE-T Modules.
Once redundancy is con figured, a switchover will occur under three conditions: a link failure; port partition; or a jabber condit ion. The switchover occurs when the primary link fails . (Note that in the unlikely event of a partial break in the link, a switchover may not occur. In this situation, use Netwo rk Management to manually swit ch over the ports.)
Once the switchover occurs, and the primary link becomes operational, a switch-over back to the primary link happens automatically if the cause of the original switchover was a link failure. If a jabber condition causes the switchover , the link will not automatically switch back to the primary once the problem is resolved. In this case, use Network Management to manually switch back to the primary link.
Refer to the ONline Ethern et Network Management Module Installation and Operation Guide for information on setting redundan cy between 10BASE-T Module ports.
Designing and Expanding the Network 2 - 13

Patch Panels

Patch panels weaken signals, thereby reducing achievable link distanc es. 3Com includes the use of one patch panel in the 150 meter link distance calculation. However, each additional patch panel in the link reduces the 150 meter link distance by approximately 10 meters.
In the example in Figure 2-2, if two patch panels were used between the top right PC and the top right concentrator, the link distance of 150 meters would have to be shortened to 140 meters. This is because the maximum allowable link distance on 22 gauge wire using 10BASE-T signaling with two intervening patch panels is 150 meters minus approximately 10 meters.
Note that a patch panel installed b etween the bottom right PC and the bottom left concentrator would not affect the link since it is only 20 meters.
2 - 14 ONline Ethernet 10BASE-T Module User’s Guide
Installing and Operating the Module
3
This chapter describes the precautionary, unpacking, and installation procedures for the Ethernet 10BASE-T Module.

Precautionary Procedures

Electrostatic discharge (ESD) can damage static-sensitive devices on circuit boards. Follow these precautions when you handle the 10BASE-T Module.
Do not remove the board from its anti-static shielding bag until you
are ready to inspect it.
Handle the board by the faceplate.
Use proper gr ounding techniques when you install the 10BASE-T Module. These techniques include using a foot strap and grounded mat or wearing a grounded static discharge wrist strap. An alternate method is to touch the grounded rack or other source of ground just before you handle the module.
Installing and Operating the Module 3 - 1

Unpacking Procedures

Use the following procedure when unpacking your 10BASE-T Module.
1. Verify that the 10BASE-T Module is the correct model by matching the model number listed on the side of the shipping cart on to the model number you ordered (5108M-TP).
Note that the product model number printed on the shipping box differs from the model number on the product. The model number on the shipping box contains the prefix ’3C9’.
2. Remove the 10BASE-T Module from the shipping carton.
3. Remove the module from the anti-static shielding bag and inspect it for damage. Always handle the 10BASE-T Module by the faceplate being careful not to touch the components.
If the module appears to be damaged, replace it in the anti-static shielding bag, return it to the shipping carton, and contact your local supplier .
3Com suggests you keep the shipping carton and anti-static shielding bag in which your module was shipped in case you later want to repackage the module for storage or shipment.
We also suggest that you record the serial number of your 10BASE-T Module. We have provided a log for this and other information specific to your modules under the Slot Usage Chart in Appendix B of the ONline
System Concentrator Installation and Operation Guide.

Installatio n Procedures

Y ou do not need to power down the ONline System Concentrator to install the 10BASE-T Module. Y ou can insert the module while the concentrator is operating (called a hot insertion). Follow t he steps below to install the 10BASE-T Module.
3 - 2 ONline Ethernet 10BASE-T Module User’s Guide
1. Set the dip switches on the board to the settings you want, if different than the default values. (Refer to Table 1- 2 , Table 1- 3 , T able 1-4, and T able 1-5 for an explanation of the dip switch settings.)
2. Locate a blank slot in the concentrator. If there is no blank slot, you must remove a blank panel on the concentrator to expose a slot for the 10BASE-T Module.
3. Insert the module into the board guides at the top and bottom of the slot and slide it into the concentrator . Make sure the connecto r is well seated into the backplane of the concentrator.
Figure 3-1 shows the installation of the 10BASE-T Module.
Figure 3-1. Installing a 10BASE-T Module
Installing and Operating the Module 3 - 3
4. Fasten the spring-loaded screws on the front of the 10BASE-T Module face-plate to the concentrator with your fingers (do not overtighten).
5. Attach the twisted pair cable to the port on the fro nt of the 10BASE-T Module as shown in Figure 3-2. Then attach the other end of the cable to another 10BASE-T Mod ule, a 10BASE-T Transceiver, or a 10BASE-T Adapter Ca rd.
Figure 3-2 shows a cable attached to the 10BASE-T Module.
Figure 3-2. 10BASE-T Module Cable Connection
3 - 4 ONline Ethernet 10BASE-T Module User’s Guide

Troubleshooting

4
This chapter describes troubleshooting procedures for the ONline Ethernet 10BASE-T Module. Information on troubleshooting will assist you in verifying operation. Typical fault conditions are addressed in this chapter.
Troubleshooting
Diagnostic features are covered in Table 1-1 on page 1-4. Table 4-1 and Table 4-2 in this chapter cover fault conditions and troubleshooting suggestions for the 10BASE-T Module. This chapter is divided into the following parts:
Troubleshooting With the Port Status LEDs Troubleshooting With the Activity LEDs Technical Assistance
Troubleshooting 4 - 1

Troubleshooting With the Status LEDs

A blinking Port Status ind icator may be a sign that the port detects a potential problem. Once a port detects a problem, you can further analyze the problem by counting the number of blinks. Table 4-1 provides troubleshooting suggestions for each of the blinking sequences.
Table 4-1. Troubleshooting With the Port Status LEDs
LED State Indication
Off Port
Disabled
Possibl e Problem
Port disabled Enable port. 10BASE-T
Module not powered
Broken LED Press the LED/Channel
Bad 10BASE-T Module
Troubleshooting
Suggestions
Check the Controller Module Power LEDs.
Check button on the Controller Module.
Replace module.
4 - 2 ONline Ethernet 10BASE-T Module User’s Guide
Table 4-1. Troubleshooting With the Port Status LEDs (Continued)
LED State Indication
1 Blink Link
Integrity Error
Possibl e Problem
Cable no t connected
Cable broken Check cable with cable
Cable too long Try a shorter cable. Remote
connection has Link Integrity disabled
Weak or no signal - link distance too long
Troubleshooting
Suggestions
Connect cable.
tester. Repair or replace cable.
Enable Link Integrity at remote connection or if the remote link does not have Link Integrity, disable Link Integrity at local connection.
Change Squelch level from high to low (low setting does not conform to the
10BASE-T standard). Bad port Try another port. Device attached
to transceiver at other end is not powered on
This is not a problem.
Troubleshooting 4 - 3
Table 4-1. Troubleshooting With the Port Status LEDs (Continued)
LED State Indication
2 Blinks Port
Partitioning
Jabber condition
Timed Blinks (LED is on f or 10 seconds, blinks off for 40 0 msecs)
Link Integrity Disabled
Possibl e Problem
Faulty cable Check cable with cable
Network overloaded
Transceiver attached to the port is jabbering or has DTE jabber
None This is not a problem.
Troubleshooting
Suggestions
tester. Repair or replace
cable.
Reassign users to
another channel to
balance the load.
Try another port or
replace module.
You may want Link
Integrity disabled .
4 - 4 ONline Ethernet 10BASE-T Module User’s Guide

Troubleshooting With the Activity LEDs

There may be situations where a port's Activity LED may not light. Use the troubleshooting suggestions in Table 4-2 to help isolate why this has occurred.
Table 4-2. Troubleshooting With the Port Activity LEDs
LED Name
Activity (Ports 1 - 8)
LED
State
Off There is no traffic
Possible Problem
received from the segme nt (normal)
The port is disabled Check the port enable dip
The power is off Check the Controller
The Activity LED has burnt ou t
The 10BASE-T Module port is faulty
The module connection to the backplane is bad
Troubleshooting
Solutions
None.
switch setting.
Module Power LEDs. Press the LED/Channel
Check button on the Controller Module.
Connect the cable to a different port.
Reinsert the 10BASE-T Module. If this fails, try another concentrator slot.
The 10BASE-T Module i s faulty
Try a different 10BASE-T Module.
Troubleshooting 4 - 5

Technical Assistance

Y ou can receive assistance for installing and troubleshooting the 10BASE-T Module by calling either your 3Com reseller or 3Com T echnical Support. Be prepared to supply a representative with the following information:
Description of the problem Steps you have tak en to try and correct the problem Type and softw a re version of the ONline network management
module being used
Version of software installed on your 10BASE-T Module Status of the front panel LEDs Configuration of your concentrator
(you may find it helpful to refer to the Slot Usage Chart in Appendix B of the ONline System Concentrator Installation and Operation Guide for a record of this information)
Reber to Appendix B for instructions on c ontacting Technical Support for your product .
4 - 6 ONline Ethernet 10BASE-T Module User’s Guide
Specifications
A

ONline Ethe r net 10BASE-T Modul e Spec ifi cati ons

This appendix lists specifications for the 10BASE-T Module. There are five subsections:
Electrical Specifications Environmental Speci fications Mechanical Spec ifications General Specifications Twisted Pair Connectors and Cables

Electrical Specifications

Backplane Interface: 96-pin edge connector, compatible with the 3Com ONline System Concentrators.
Power Requirements: 1.75 A for 5V Fuse: 4.0 Amps Fast blow Watts: 8.75
Specifications A - 1

Environmental Specifications

Operating Temperature: 0° to 50° C (32° to 122° F) Storage Temperature: -30° to 65° C (-22° to 149° F) Humidity: less than 95%, non-conden sing BTU/hr: 30

Mechanical Specification s

Dimensions : 1.0" W x 10.25" L x 8.5" H
(2.54 cm x 26.04 cm x 21.6 cm)
Weight: 1.25 lb. (0.57 kg.)

General Specifications

Data Rate: 10 Mbps (million bits per second) Data modulation : Manchester Diagnostic modulation: Link Integrity pulse Collision detection: 100% deterministic Maximum number of nodes: 1024 Configuration rules: supports IEEE 802.3 controllers and IEEE 802.3
repeaters Jabber Protectio n: 6.5 milliseconds Port Connectors: Shielded 8-pin modular telephone jack, compatible with
an unshielded connector Cabling: 22, 24 , or 26 AWG un shielded or shielded twisted pair cable Cable differential impedance: 85 ohms to 150 ohms over 1 to 16 MHz band
A - 2 ONline Ethernet 10BASE-T Module User’s Guide
Cable propagation velocity: >.585c Host Interface: 3Com ONline System Concentrator bus interface standard Installation Att achment: Two thumbscrews on the mounting bracket

Twisted Pair C on necto rs an d Cabl es

There are many types of cables and connectors that you can u se to link your 10BASE-T Module to your network. These cables and connectors are explained in the following sections. Use this information to ensure that the cables and connecting hardware meet requirements. For proper operation, use only approved cables when yo u install all equipment. This section is divided into the following parts:
Twisted Pair Co nnectors Twisted Pair Cables

Twisted Pair Connectors

The IEEE 802.3 10BASE-T standard for pin-outs must be used. The following cable standard must be used. 10BASE-T uses 2 pairs of wire: pins 1 & 2 and pins 3 & 6. If the pairs are not configured this way, the connection will not work properly. Datagrade cable should have the following pin pairings:
pins 4 and 5 are pair 1 pins 3 and 6 are pair 2 pins 1 and 2 are pair 3 pins 7 and 8 are pair 4
Specifications A - 3
Refer to Figure A-1 for an example of this connector and the cable pin-outs.
Pair 2
W-G G W-O BL W-BL
Figure A-1. RJ45 C onnector Pin-outs
Some installations may have 50-pin Telco connectors at the wiring closet. We recommend using a patch panel that converts from 50-pin to RJ45-type connectors. This allows direct connection to the ONline Ethernet 10BASE-T Module in your ONline System Concentrator.

Twisted Pair Cables

The cables that are supported must meet the following qu alifications:
Pair 3 Pair4
1 2 3 4 5 6 7 8
Pair 1
O BRW-BR
Jack Positions
22, 24, or 26 gauge twisted pair cable 80 to 150 ohm impedance minimum of 2 pairs
Usually, a pair on a twisted pair cable is designated by a solid color wire twisted with a striped wire with the same color.
A - 4 ONline Ethernet 10BASE-T Module User’s Guide

Connecting Twisted Pair Cables

We recommend that you connect cables first at the active concentrator location, and co nnect transceivers second. Refer to the ONline System Concentrator Installation and Operation Guide for more information about the ONline System Concentrator conn ections.
Specifications A - 5
B
Technical Support
3Com provides easy access to technical support information through a variety of services. This appendix describes the following services:
On-line Technical Support Support from Your Network Supplier Support from 3Com Returning Products for Repair Accessing the 3Com MIB 3Com Technical Public at ions

On-line Technical Sup port

3Com offers world wide product support through the following on-line systems:
Email Technical Service World Wide Web Site
Technical Support B - 1

Email Technical Support

Y ou can contact the Integrated Systems Division (formerly Chipcom) on the Internet fo r technical support using the e-mail address techsupp@chipcom.com.

World Wide Web Site

You can access the latest networking information on the 3Com World Wide Web site by entering our URL into your Internet browser:
http://www.3Com.com/
This service features news and information about 3Com products, customer service and support, the 3Com latest news releas es, selected articles from 3TECH™, the 3Com award-winning technical journ al, and more.
You can contact the Integrated Systems Division on the World Wide Web by entering our URL into your Internet browser:
http://www.chipcom.com/
There are links between both WWW pages to view information from all 3Com divisio n s.

Support from Your Network Supplier

If additional assistance is required, contact your network supplier. Many suppliers are authorized 3Com service partners who are qualified to provide a variety of services, including network planning, installation, hardware maintenance, application training, and support services.
B - 2 ONline Ethernet 10BASE-T Module User’s Guide
When you contact your network supplier for assistance, have the following information ready:
Diagnostic error messages A list of system hardware and sof tware, inclu ding revision levels Details about recent configuration changes, if applicable
If you are unable to contact your network supplier, see the following section on h ow to contact 3Com.

Support from 3Com

If you are unable to receive support from your network supplier, technical support contracts are available from 3Com.
For direct access to customer service for Integrated Systems Division products in:
U.S.A. and Canada - call (800) 724-2447 Asia Pacific - call (508) 787-5151 Europe - Refer to the table below. For European countries not listed,
call 31 30 60 299 00.
Country Telephone Number Country Telephone Number Belgium 0800 71429 Netherlands 06 0227788 Denmark 800 17309 Norway 800 11376 Finland 0800 113153 Spain 900 983125 Franc e 05 917959 Sweden 020 795482 Germany 0130 821502 U.K. 0800 966197 Ireland 1 800 553117 U.S. 800 876-3266 Italy 1678 79489
Technical Support B - 3
For access to customer service for all 3Com products, call (800) 876-3266. You can also contact the Integrated Systems Division (ISD) on the Internet
by using the e-mail address techsupp@chipcom.com.

Return i ng P roducts fo r Repa ir

A product sent directly to 3Com for repair must first be assigned a Return Materials Authorization (RMA) number. A product sent to 3Com without an RMA number will be returned to the sender unopened, at the sender’s expense.
To obtain an RMA number for In tegrated Systems Divi si on products (formerly Chipcom), use the following numbers.
Country Telephone Number Fax Number U.S. and Canada (800) 724-2447 (508) 787-3400 Europe (44) (1442) 275860 No Fax Asia Pacific (508) 787-5296 (508) 787-3400

Accessing the 3Com MIB

The 3Com Management Information Base (MIB) for the Integrated Systems Division describe s commands that enable you to manage 3Com SNMP-based products. The MIB is available over the Internet on an anonymous FTP server. Up dates to these MIBs are released as new 3Com products are introduced.
To access Internet versions:
1. FTP to ftp.chipcom.com (151.104.9.65).
2. Enter the login n ame anonymous.
B - 4 ONline Ethernet 10BASE-T Module User’s Guide
3. Enter your full Internet e-mail address as the password (for example, jdoe@company.com).
4. Change to the mib or schema directory using the cd /pub/mibs or cd /pub/ mi bs /s ch em as command.
5. To view the 3Com MIB, OID, or schema entries, enter the dir command.
To pause the display, press [CTRL-S]. To continue the display, press [CTRL-Q].
6. Copy the MIB, OID, or schema files to your current directory using the appropriate command (for example, get chipcom.mib).
7. To exit the F TP session, invoke the quit command.

3Com Te chn ic al Pub lic atio ns

If you have comments or questions on 3Com Integrated Systems Division T echnical Publications documents, please contact the T echnical Publications group by FAX (508) 229-1551.
Technical Support B - 5
Index
Numerics
3Com Bulletin Board Service (3ComBBS), B-3
A
Audience of Manu al, xi
B
Backbone
Fiber Medium
bulletin board service, B-3
, 2-2
C
Cable Types
Shielded Twisted Pair Unshielded Twisted Pair, 1-1
Cabling
Connectors Fiber Backbone, 2-7, 2-8, 2-1 0 Redundant Links, 2-13 Twisted Pair Backbone, 2-11 Twisted Pair Connections, 2-10 Wire Types, A-4
Configuration Rules
Fiber Backbone
Configuration Rules
Fiber Backbone General, 2-2, 2-3, 2-5 Twisted Pair Backbone, 2-11, 2-12
, A-3, A-4
, 1-1
, 2-9
, 2-7, 2-8
D
Dip Switch Settings
Channel Select Crossover Mode, 1-6, 1-7 Link Integrity, 1-9, 1-1 0 Port Status, 1-5 Squelch Mode, 1-7, 1-8
Dip Switches, 1-4
, 1-8, 1-9
F
FCC notice, ii Features, 1-1, 1-2 Fiber Link Distances, 2-5 Front Panel Indicators
Activity LEDs Status Indicators, 1-2 Status LEDs, 1-4
, 1-2, 1-4
I
Installation
Cabling Installing The M odule, 3-3, 3-4
, 3-4
L
LAN Product Equivalent Distances, 2-6 Link Distances
Configuration Rules
, 1-1
Index 1
M
U
MIB, B-4
N
network supplier support, B-2
O
ONline Controller Mo dule, 1-10 ONline Ethernet Management Module, 1-11,
1-12
on-line technical service s, B-1
P
Patch Panels, 2-14
R
Redundancy, 2-13 returning products for repair, B-4
S
Shielded Twisted Pair, 2-10, 2-1 2 SNMP Commands, B-4 Star Topology, 2-3
Unshielded Twisted Pair, 2-8, 2-10, 2-11
V
VDE compliance, ii
W
Wire Types, 1-1
T
Technical Assistanc e, 4-6 Technical Support, 4-6, B-1 Troubleshooting
Port Activity LEDs Port Status LEDs, 4-1, 4-3, 4-4 Technical Assistanc e, 4-6
Twisted Pair
, A-4, A-5
Cables Connections, A-5 Connectors, A-3, A-4
2 Index
, 4-5
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