®
ONline Ethernet 24-Port
10BASE-T Module
Installation Guide
Document Number 17-00232-3
Printed February 1996
Model Number: 5124M-TPCL
5124M-TP
3Com Corporation
118 Turnpike Road
Southborough, MA 01772-1886
U.S.A.
(508) 460-8900
FAX (508) 460-8950
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Contents
How to Use This Guide
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Structure of This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
3Com Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvii
Reference Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xvii
Chapter 1 — Introduction
Ethernet 24-Port 10BASE-T Module Description . . . . . . . . . . . . . . . . . . . . . .1-1
Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Bank Switching Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Model Number 5124M-TPCL Features . . . . . . . . . . . . . . . . . . . . . . . . . .1-3
Model Number 5124M-TP Features . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Chapter 2 — Designing and Expanding the Network
Understanding the General Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Rules for Configuring a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
LAN Equivalence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6
Choosing a Network Backbone Cabling Structure . . . . . . . . . . . . . . . . . . . .2-7
Building a Network (Star Configuration) . . . . . . . . . . . . . . . . . . . . . . . .2-8
Building a Network (Serial Configuration) . . . . . . . . . . . . . . . . . . . . . . .2-9
24-Port Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10
Fiber Backbone, 10BASE-T To-The-Desk . . . . . . . . . . . . . . . . . . . . . . . .2-10
10BASE-T Backbone, 10BASE-T To-The-Desk . . . . . . . . . . . . . . . . . . . .2-12
Using Patch Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-14
Establishing Fault-Tolerant Configurations . . . . . . . . . . . . . . . . . . . . . . . . .2-14
Setting Port Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15
Configuring Ports for Fault Tolerance . . . . . . . . . . . . . . . . . . . . . .2-15
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Setting Backbone Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-15
Redundant Twisted Pair Backbone . . . . . . . . . . . . . . . . . . . . . . . .2-16
Chapter 3 — Installing and Operating the Module
Precautionary Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Quick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Unpacking Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
Setting the DIP Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
DIP Switch Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5
DIP Switch Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7
Installing the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10
Using 90° Cable Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
Installing the Cable Tie-Wrap Kit . . . . . . . . . . . . . . . . . . . . . . . . . .3-13
Securing 90° Cables to the Module . . . . . . . . . . . . . . . . . . . . . . .3-15
Configuration in a Managed Environment . . . . . . . . . . . . . . . . . . . . . . . .3-17
If Management is Not Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-18
Before Configuring the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Enabling Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Enabling Port Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-19
Enabling Link Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-20
Selecting a Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-20
Enabling Remote Diagnostics Mode . . . . . . . . . . . . . . . . . . . . . . . . . .3-21
Setting the Autopartition Threshold Value . . . . . . . . . . . . . . . . . . . . .3-22
Saving Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23
Showing Module Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23
Show Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-24
Show Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-25
Gathering Network Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27
Selecting the Per-Port Counters Connector . . . . . . . . . . . . . . . . . . . . .3-28
Monitoring the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-29
Verifying LED and Network Assignments . . . . . . . . . . . . . . . . . . . . . . . . .3-32
Using the LED Check Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-32
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Chapter 4 — Troubleshooting
Troubleshooting Using the Port Status and Port Activity LEDs . . . . . . . . . . .4-2
Troubleshooting Using the Port Status LEDs . . . . . . . . . . . . . . . . . . . . .4-2
Troubleshooting Using the Port Activity LEDs . . . . . . . . . . . . . . . . . . . .4-4
Technical Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4
Appendix A — Specifications
General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
Power Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Twisted Pair Cable and Connector Specifications . . . . . . . . . . . . . . . . . . . . A-5
Twisted Pair Cable Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Twisted Pair Connector Specifications . . . . . . . . . . . . . . . . . . . . . . . . . A-7
RJ-45 Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7
50-Pin Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
Connecting Twisted Pair Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
Appendix B — Technical Support
On-line Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1
Email Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2
World Wide Web Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2
Support from Your Network Supplier . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-2
Support from 3Com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-3
Returning Products for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4
Accessing the 3Com MIB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4
3Com Technical Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5
Index
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Figures
Figure 1-1.
Typical 24-Port Module Configuration . . . . . . . . . . . . . . . . .1-5
Star-Wiring Configuration . . . . . . . . . . . . . . . . . . . . . . . . . .2-8
Serial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-9
Figure 2-1.
Figure 2-2.
Figure 2-3.
Sample Configuration Distance Calculation Using
24-Port Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11
Figure 2-4.
Figure 2-5.
Unshielded Twisted Pair Network Using 24-Port Modules .2-13
Redundant Twisted Pair Configuration Using 24-Port
Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16
Figure 3-1.
Model 5124M-TPCL and Model 5124M-TP DIP Switch
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6
Figure 3-2.
Figure 3-3.
Installing a 24-Port Module (Model Number 5124M-TPCL) 3-11
24-Port Module Cable Connection
(Model Number 5124M-TPCL) . . . . . . . . . . . . . . . . . . . . .3-12
Figure 3-4.
Figure 3-5.
Attaching the Tie-Wrap Bracket to the Module . . . . . . . . .3-14
Attaching Cables With 90° Connectors
(Model Number 5124M-TPCL) . . . . . . . . . . . . . . . . . . . .3-15
Figure 3-6.
Figure 3-7.
Attaching Cables With 90° Connectors . . . . . . . . . . . . . . .3-16
24-Port Module Faceplate and ONline System
Concentrator (Model Number 5124M-TPCL) . . . . . . . . . . .3-29
Figure 3-8.
24-Port Module Faceplate and ONline System
Concentrator (Model Number 5124M-TP) . . . . . . . . . . . . .3-30
Figure A-1.
Figure A-2.
24-Port Module RJ-45 Connector Pinouts . . . . . . . . . . . . . A-8
50-Pin Male and Female Connectors . . . . . . . . . . . . . . . . . A-9
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Tables
Table 2-1.
Seven Basic Network Rules . . . . . . . . . . . . . . . . . . . . . . . . .2-3
LAN Product Equivalent Distances . . . . . . . . . . . . . . . . . . . .2-6
Procedures for Completing Installation . . . . . . . . . . . . . . . .3-2
DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
Channel (Network) Select DIP Switch Settings . . . . . . . . . . .3-9
24-Port Module LED Interpretations. . . . . . . . . . . . . . . . . .3-31
Network Check Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33
Troubleshooting Using the Port Status LEDs. . . . . . . . . . . . .4-2
Troubleshooting Using the Port Activity LEDs. . . . . . . . . . . .4-4
24-Port Module General Specifications. . . . . . . . . . . . . . . . A-2
24-Port Module Power Specifications. . . . . . . . . . . . . . . . . A-3
24-Port Module Fuse Specifications . . . . . . . . . . . . . . . . . . A-4
24-Port Module Environmental Specifications. . . . . . . . . . . A-4
24-Port Module Mechanical Specifications . . . . . . . . . . . . . A-5
IBM Twisted Pair Cable Specifications . . . . . . . . . . . . . . . . A-6
50-Pin Cable Pinouts and Port Assignments . . . . . . . . . . . A-10
Table 2-2.
Table 3-1.
Table 3-2.
Table 3-3.
Table 3-4.
Table 3-5.
Table 4-1.
Table 4-2.
Table A-1.
Table A-2.
Table A-3.
Table A-4.
Table A-5.
Table A-6.
Table A-7.
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How to Use This Guide
This guide tells you how to install and operate the 3Com ONline™ Ethernet
24-Port 10BASE-T Module for the ONline System Concentrator. It also
includes information on monitoring this module using an ONline network
management module. An appendix explains cabling guidelines and options
for this module.
Audience
This guide is intended for the following people at your site:
❑ Network manager or administrator
❑ Hardware installer
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Structure of This Guide
This guide contains the following chapters:
Chapter 1, Introduction – Introduces the functions and features of the
ONline Ethernet 24-Port 10BASE-T Module.
Chapter 2, Designing and Expanding the Netw ork – Shows possible
network configurations using the ONline System Concentrator and the
ONline Ethernet 24-Port Module.
Chapter 3, Installing and Operating the Module – Provides illustrated
procedures for installing the 24-Port Module into the ONline System
Concentrator. Also shows front panel LEDs and dip switches on the
module and describes network management commands.
Chapter 4, Troubleshooting – Provides help in isolating and correcting
problems that may arise when installing or operating this module.
Appendix A, Specifications – Provides electrical, environmental, and
mechanical specifications, plus information on 50-pin Telco-type
connectors, RJ-45 connectors, and twisted pair cables.
Appendix B, Technical Support – Lists the various methods for
contacting the 3Com technical support organization and for accessing
other product support services.
Index
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Document Conventions
The following document conventions are used in this manual:
Convention
Courier text
Indicates
User input
Example
In the Agent Information Form,
enter MISin the New Contact
field.
System output
Path names
After pressing the Apply
button, the system displays
the message
Transmitting data.
Bold command
string
Before you begin, read the
readme.txt file located in
/ usr/ snm/ agents.
Italic text in braces
User-substituted Use the following command to
identifiers
show port details:
SHOW PORT {slot.all} VERBOSE
Capitalized text in
plain brackets
Keyboard entry Type your password and press
by the user
[ENTER].
Italics
Text emphasis,
Ensure that you press the Apply
document titles button after you add the new
search parameters.
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Convention
Note:
Indicates
Example
A Note. The
information is
important
Note: Use STP lobe
cables for your system.
Caution: A Caution. A
condition may
damage
Caution: Do not put
your installation
diskettes on a
software or
hardware
magnetic surface.
This may damage the
diskettes.
Warning: A Warning. A
condition may
Warning: Wear eye
protection when
performing these
maintenance
threaten
personal safety
procedures.
Related Documents
This section provides information on supporting documentation, including:
❑ 3Com Documents
❑ Reference Documents
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3Com Documents
The following documents provide additional information on 3Com
products:
17-Slot ONline System Concentrator Installation and Operation
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 how 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 Management Module in the
ONline System Concentrator and explains the LEDs on the module
faceplate. This guide also provides instructions for connecting a terminal to
the module and describes the management commands necessary to
perform management tasks on the concentrator and on remote devices.
ONline Management Commands Guide – Provides an alphabetized
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 1157, 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.
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Introduction
1
This chapter introduces you to the 3Com ONline™ Ethernet 24-Port
10BASE-T Modules (Model Numbers 5124M-TPCL and 5124M-TP). The
modules are referenced throughout this guide as the 24-Port Module.
You can install both versions of the 24-Port Module in all 3Com ONline
®
System Concentrator and ONcore Switching Hub models.
This chapter contains the following sections:
❑ Ethernet 24-Port 10BASE-T Module Description
❑ Theory of Operation
Ethernet 24-Port 10BASE-T Module Description
This section describes:
❑ Module Features
❑ Model Number 5124M-TPCL Features
❑ Model Number 5124M-TP Features
Introduction 1 - 1
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The ONline Ethernet 24-Port Module is an IEEE 802.3 repeater module that
complies with the 10BASE-T standard. It connects up to 24 devices (PCs,
terminals, printers, modems) to the ONline System Concentrator.
The 24-Port Module (Model Number 5124M-TPCL and Model Number
5124M-TP) is a bank switching module. Bank switching is the assignment of
a group of 12 consecutive ports to a single network, or to an isolated
network.
Note: You cannot assign individual ports on the 5124M-TPCL and
the 5124M-TP modules to different networks.
Module Features
The ONline Ethernet 24-Port 10BASE-T Module:
❑ Is an IEEE 802.3 repeater module that complies with the 10BASE-T
standard.
❑ Connects up to 24 devices (PCs, terminals, printers, modems) to the
3Com ONline System Concentrator or ONcore Switching Hub.
❑ Provides high port density at a low cost per port.
❑ Supports up to 100 meters on 10BASE-T-compliant unshielded twisted
pair (UTP) or shielded twisted pair (STP) wiring.
❑ Features “hot swap” capability so that you can install or remove the
module without having to power down the concentrator.
❑ Provides bank-switching capability.
❑ Provides a user-selectable autopartition threshold for flexibility in
dealing with collision-related network slowdowns.
❑ Allows you to disable Link Integrity so you can connect to equipment
that does not conform to the 10BASE-T standard.
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❑ Is designed with all ports internally crossed over, as required by the
10BASE-T standard. This enables you to connect the 24-Port Module
to a 10BASE-T transceiver without using an external crossover
adapter.
Bank Switching Capability
Bank switching is the assignment of a group of twelve consecutive ports to
a single network, or to an isolated network.
In an unmanaged concentrator you can use DIP switches to:
❑ Assign all module ports to an Ethernet network or to an isolated
network
❑ Assign port groups 1 through 12 or 13 through 24 to different
Ethernet or isolated networks
In a managed concentrator you can use network management commands
to assign the following port “groups” to any of three backplane networks,
or to either of two isolated networks:
❑ Ports 1 through 12
❑ Ports 13 through 24
❑ All ports on the module
Model Number 5124M-TPCL Features
Model Number 5124M-TPCL permits you to connect groups of 12
consecutive 10BASE-T-compliant module ports using:
❑ Two 50-pin Telco connectors (one connector attached to 12 ports)
❑ Two 25-pair 10BASE-T cables or two 12-leg “hydra” cables (one cable
per 12 ports)
Introduction 1 - 3
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Model Number 5124M-TP Features
Model Number 5124M-TP permits you to connect individual
10BASE-T-compliant ports using 24 RJ-45 connectors (one connector per
port). The RJ-45 connectors provide direct connections to 10BASE-T cables
(one cable per connected port).
Theory of Operation
ONline Ethernet 24-Port 10BASE-T Modules incorporate repeaters and
twisted pair transceivers that receive and restore amplitude to incoming
signals. 24-Port Module repeaters restore phase and frequency.
Repeated signals:
❑ Synchronize to the system clock
❑ Enter on the TriChannel® backplane of the ONline System
Concentrator.
Outgoing signals from the TriChannel backplane are:
❑ Sent directly to transceivers
❑ Transmitted to twisted pair link segments by the transceivers
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Figure 1-1 shows a 24-Port Module (Model Number 5124M-TPCL) connected
to nodes by means of bundled 25-pair or 12-leg hydra cables and patch
panels.
Concentrator
End Nodes
Patch Panels
Figure 1-1. Typical 24-Port Module Configuration
Introduction 1 - 5
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Designing and
Expanding the Network
2
This chapter contains configuration information to help you design your
network. It describes how to configure networks using the ONline System
Concentrator and ONline Ethernet 24-Port 10BASE-T Modules. It also
provides examples of network cabling structures and Ethernet network
cabling solutions.
This chapter contains the following sections:
❑ Understanding the General Rules
❑ Choosing a Network Backbone Cabling Structure
❑ 24-Port Module Configurations
❑ Using Patch Panels
❑ Establishing Fault-Tolerant Configurations
Note: To ensure proper operation of your network, install all
equipment using only approved cables. Refer to Appendix
A for information on cable requirements.
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Understanding the General Rules
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. Use these guidelines for building
your network.
Refer to the sections that follow for specific rules for:
❑ Determining maximum 24-Port Module fiber link distances
❑ Connecting various horizontal media types (10BASE-FB, twisted pair)
to a 10BASE-FB backbone
❑ Examples of recommended fault-tolerant configurations
This section describes:
❑ Rules for Configuring a Network
❑ Calculating Equivalent Fiber Distances
Rules for Configuring a Network
This section outlines seven basic network rules and 3Com
recommendations for building an Ethernet network.
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For more hardware-specific information on the 24-Port Module, refer to
Appendix A.
Table 2-1. Seven Basic Network Rules
Rule
Definition
Recommendations/ Notes
1
If possible, use
10BASE-FB as the
backbone medium.
Use 62.5 micron cable to conform
with the IEEE 10BASE-F and
upcoming ANSI FDDI standards.
Use ST-type connectors.
2
Wire the backbone in
a star topology to
isolate faults.
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 -- just make
sure to run at least two fiber
strands to every backbone
connection.
3
The maximum Fiber
Ethernet network
diameter is 4200
The 4200 meters is the maximum
distance between any two
transceivers on the network.
meters of fiber cable.
The 4200 meters does not include
the transceiver cable (that is, drop
or patch cable) that connects a
device with an external
transceiver. Transceiver 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.
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Table 2-1. Seven Basic Network Rules (Continued)
Rule
Definition
Recommendations/ Notes
4
Certain LAN devices
Many LAN products delay the signal
on the network shrink that goes through them. This is
the maximum Fiber
Ethernet network
diameter to less than
4200 meters.
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.
5
Assume that one
This is a conservative rule. For
meter of coaxial or
example, the actual equivalence is
twisted pair is equal to about 1.1 meters of coaxial for
one meter of fiber
cable.
every meter of fiber. For simplicity,
assume one meter.
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Table 2-1. Seven Basic Network Rules (Continued)
Rule
Definition
Recommendations/ Notes
6
The fiber link distances In general, on 62.5 micron cable,
must not exceed the
limits imposed by the
you can go up to 4000 meters
point-to-point using the ONcore or
optical power budget. 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.
7
When in doubt, use a
bridge.
If you are not certain if you have
exceeded allowable network
distances, use a bridge to extend
the network.
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LAN Equivalence
LAN equivalence 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
Equivalent
LAN Product
Distance (meters)
ONcore Ethernet 10-Port 10BASE-FB Module
Incoming signal to fiber port
190
140
50
Outgoing signal from fiber port
ONcore Ethernet 10BASE-T Module
Incoming signal to TP port
585
420
165
585
420
165
190
140
50
Outgoing signal from TP port
ONline Ethernet 10BASE-T Modules
Incoming signal to TP port
Outgoing signal from TP port
ONline Ethernet Fiber or 10BASE-FB Modules
Incoming signal to fiber port
Outgoing signal from fiber port
ONline Ethernet FOIRL Module
Incoming signal to fiber port
560
330
230
0
Outgoing signal from fiber port
ONline Ethernet Transceiver Module
ORnet Star Coupler (8 or 14 port) 26
180
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Table 2-2. LAN Product Equivalent Distances (Continued)
Equivalent
Distance (meters)
LAN Product
ONline Ethernet BNC Module
Incoming signal to BNC port
Outgoing signal from BNC port
ONline Ethernet Repeater Module
Incoming signal to AUI port
Outgoing signal from AUI port
IEEE Repeater
900
450
450
800
600
200
800
Choosing a Network Backbone Cabling Structure
Because of fiber's long-distance capabilities and immunity to noise, 3Com
strongly recommends using fiber as the backbone.
This section describes:
❑ Building a Network (Star Configuration)
❑ Building a Network (Serial Configuration)
You can implement either of these configuration topologies when
connecting your network backbone using 10BASE-FB modules installed in
an ONline System Concentrator.
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Building a Network (Star Configuration)
Wire your network in a star configuration using an ONline System
Concentrator as the central point in the network. Wiring in a star
❑ Faults in the cable plant affect only a piece of the network.
❑ You can easily expand the size of your network.
Figure 2-1 shows 10BASE-T and 10BASE-FB modules installed in a star-wired
network.
Figure 2-1. Star-Wiring Configuration
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Use a serial configuration for smaller diameter networks that are not
expected to grow. Serial configurations reduce the overall network
diameter by 190 meters for each concentrator in any path.
Figure 2-2 shows 10BASE-FB modules installed in a network using a serial
configuration.
Figure 2-2. Serial Configuration
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24-Port Module Configurations
This section describes how to define total network size based on the limits
of IEEE 802.3 collision detection. This section also describes how to
construct a network consisting of a Fiber Backbone and 10BASE-T
unshielded twisted pair connections to-the-desk.
This section describes:
❑ Fiber Backbone, 10BASE-T To-The-Desk
❑ 10BASE-T Backbone, 10BASE-T To-The-Desk
Fiber Backbone, 10BASE-T To-The-Desk
Be aware of the following additional rules for configuring a network:
❑ The four-repeater rule in Ethernet limits the number of 10BASE-T
modules between any two transceivers. The path from the TP port to
the backplane counts as 1/2 of a repeater and the path from the
backplane to the TP port counts as 1/2 of a repeater. You must add
a bridge if the path from one transceiver to another exceeds the
four-repeater rule.
❑ The equivalent fiber distance for 10BASE-T modules is defined as
follows:
–
420 meters for signals that externally enter a 10BASE-T
module port
–
165 meters for signals that internally enter a 10BASE-T
module through the ONline concentrator backplane
For each pair of 10BASE-T modules that a signal goes through, there is an
equivalent fiber distance of 585 meters (420 m + 165 m =585 m). In
addition, if a signal makes a roundtrip through a 10BASE-T Module (that is,
enters a 10BASE-T port externally and exits through another port on the
same 10BASE-T module), that counts as 585 meters of equivalent fiber
distance, and as a full repeater.
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Example: Sample Configuration Distance Calculation
Use the following example to determine if the 10BASE-T transceivers in
Figure 2-3 are within legal Ethernet limits. Identify the two transceivers
that are likely to be the greatest fiber equivalent distance apart. In
Figure 2-3, they are 10BASE-T transceivers A and B.
Figure 2-3 shows 24-Port Modules installed in each of three concentrators.
Figure 2-3. Sample Configuration Distance Calculation Using
24-Port Modules
To determine if your network configuration is legal:
1. Use 4200 m as the maximum network diameter for a pure fiber
network as defined by the 802.3 specification.
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2. Calculate the equivalent distances for each concentrator, and
subtract the total from 4200.
3. Subtract all cable lengths between the two transceivers and if the
result is greater than zero, the configuration is within legal Ethernet
limits.
For the configuration shown in Figure 2-3 to work, ensure the equivalent
fiber distance between Transceiver A and Transceiver B is less than 4200
meters.
As shown in the calculation, there are still 1510 meters left for expansion in
this configuration. Therefore, this configuration is legal.
10BASE-T Backbone, 10BASE-T To-The-Desk
In constructing a twisted pair backbone:
❑ Ensure there are no more than eight 10BASE-T modules in the path
between any two transceivers (Ethernet four-repeater rule). Each
10BASE-T module counts as 1/2 of a repeater unless the signal goes
in one port and out another port on the same module. In that case,
❑ Add a bridge if you have more than eight 10BASE-T modules serially
connected. Each bridge creates a subnetwork. Each subnetwork can
have its own 4200 meter network diameter.
Figure 2-4 shows a possible unshielded twisted pair network using 24-Port
Modules and 24-gauge cable.
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Figure 2-4. Unshielded Twisted Pair Network Using 24-Port Modules
The equivalent fiber distance can be calculated as follows:
Total link distance: 100 m + 100 m + 100 m + 50 m + 20 m = 370 m
Total equivalent distance of the 24-Port Modules:
4 * 420 m + 4 * 165 m = 2340 m
(signal externally enters 4 Twisted Pair Modules: 4 * 420 m)
(signal internally enters 4 Twisted Pair Modules from the backplane: 4 *
165 m)
Note: All 3Com 10BASE-T modules (8-Port 10BASE-T Module,
50-Pin 10BASE-T Module, or the 24-Port 10BASE-T Modules)
fall under these same rules.
Total equivalent distance: 370 m + 2340 m = 2710 m
Because the total equivalent distance (2710 m) is less than 4200 meters, this
configuration is legal.
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Using Patch Panels
Patch panels weaken signals that pass through them, thereby reducing
achievable link distances. 3Com assumes the use of one patch panel in the
100 meter link distance calculations specified in this installation guide. Each
additional patch panel in the link reduces the 100 meter link distance by
approximately 10 meters.
In Figure 2-4:
❑ If two patch panels were used between the top right PC and the top
right concentrator, the link distance of 100 meters would have to be
shortened to 90 meters.
❑ The link distance would have to be shortened to 90 meters because
the maximum allowable link distance on 24-gauge wire using
10BASE-T signaling with two intervening patch panels is 100 meters
minus approximately 10 meters.
❑ A patch panel installed between the bottom right PC and the bottom
left concentrator would not affect the link because it is only 20
meters away.
Establishing Fault-Tolerant Configurations
You can establish fault tolerance for any port on the 24-Port Module, for
selected portions of the network backbone, or for the entire network
backbone.
This section describes:
❑ Setting Port Redundancy
❑ Setting Backbone Redundancy
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Setting Port Redundancy
When you enable redundancy between two ports, the ports are
automatically enabled. Once port redundancy is enabled:
❑ Port 1 is the primary link, which passes data.
❑ Port 2 is the redundant link, which does not pass data in either
direction. However, the link is monitored for any failures (the Port
Status LED indicates any problems).
Configuring Ports for Fault Tolerance
You can configure the 24-Port Module ports in one of three different ways:
❑ Normal Configuration - All ports operate as independent cable
ports.
❑ Flexible Redundant Configuration - You can arbitrarily assign
primary and backup ports to any pair of ports. You can configure
this mode only through the advanced management commands
provided with the Ethernet Management Module Version v3.0 or
later.
❑ Normal and Redundant Configuration - You can enable
redundancy between one set of ports and have the remaining ports
operate as independent ports.
Setting Backbone Redundancy
For maximum backbone tolerance, connect both the primary and backup
ports back to the central concentrator (refer to Figure 2-5). This
configuration allows the backup port to automatically take over if the
primary link fails.
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Redundant Twisted Pair Backbone
You can implement twisted pair link redundancy between ONline System
Concentrators using network management.
Figure 2-5 shows an example of a redundant configuration between
concentrators using 24-Port Modules.
Figure 2-5. Redundant Twisted Pair Configuration Using 24-Port
Modules
To set link redundancy between two 24-Port Modules (refer to Figure 2-5):
1. Connect one port on the 24-Port Module installed in the concentrator
on the left to a corresponding port on the 24-Port Module installed in
the concentrator on the right.
2. Connect the second port on the 24-Port Module installed in the
concentrator on the left to a corresponding port on the 24-Port
Module installed in the concentrator on the right.
Note: Use a crossover adapter between each link because the
links are designed to be connected to station ports, not to
other lobe ports.
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3. Use the SET PORT MODE REDUNDANT network management
command to specify which port is the primary link and which is the
backup link.
Note: If the 24-Port Modules are powered down, and then
brought back up without a 3Com network management
module present, a network loop may occur. To prevent
possibe network failure, set the DIP switch for the backup
port to disable.
Once redundancy is configured, a switchover occurs under two conditions:
❑ Link failure
❑ Port partition
The switchover occurs when the primary link fails.
A switchover back to the primary link happens automatically once the
problem is resolved.
Refer to the appropriate network management module installation and
operation guide for information on setting redundancy between 24-Port
Module ports.
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Installing and
Operating the Module
3
This chapter describes installation procedures for the ONline Ethernet
24-Port 10BASE-T Modules (Model Number 5124M-TPCL and Model Number
5124M-TP).
This chapter contains the following sections:
❑ Precautionary Procedures
❑ Quick Installation
❑ Unpacking Procedures
❑ Setting the DIP Switches
❑ Installing the Module
❑ Configuration in a Managed Environment
❑ Saving Module Configurations
❑ Showing Module Configurations
❑ Gathering Network Statistics
❑ Monitoring the Front Panel
❑ Verifying LED and Network Assignments
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Precautionary Procedures
Electrostatic discharge (ESD) can damage static-sensitive devices on circuit
boards. Follow these precautions when you handle the 24-Port Module.
❑ Do not remove the board from its antistatic shielding bag until you
are ready to inspect or install it.
❑ Handle the board by the faceplate only.
❑ Use proper grounding techniques when you install the 24-Port
Module. These techniques include:
–
–
Using a foot strap and grounded mat or wearing a
grounded static discharge wrist strap.
Touching the grounded rack or other source of ground
just before you handle a 24-Port Module.
Quick Installation
Table 3-1 outlines the steps for installing your module. If you are familiar
with installing ONline modules, you may want to use this table as a
checklist. Otherwise, consult the remainder of this chapter.
Table 3-1. Procedures for Completing Installation
Step
Procedure
Section Title
1
Verify that your network complies
with the basic rules for network
design.
Chapter 2, Designing
and Expanding the
Network
2
Unpack the module.
Chapter 3, Unpacking
Procedures section
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Table 3-1. Procedures for Completing Installation
Step
Procedure
Section Title
3
If you do not have a management
module installed in the concentrator,
configure the DIP switch settings to
your specifications.
Chapter 3, Setting the
DIP Switches section
4
If you have Model Number
Chapter 3, Installing
5124M-TPCL, insert the module into a the Module section
single open slot in the concentrator
and tighten the faceplate screws.
If you have Model Number 5124M-TP,
insert the module into two
consecutive empty slots in the
concentrator and tighten the faceplate
screws.
5
6
7
Establish connections from the 24-Port Chapter 3, Installing
Module to devices or to a 10BASE-T
transceiver using the appropriate
connectors and cabling.
the Module section
If you have a management module
Chapter 3,
installed in the concentrator, configure Configuring the
the module using the management
commands.
Module section
Verify LED status for normal
operation.
Chapter 3, Verifying
LED and Network
Assignments section
Note: To correct problems, consult
the troubleshooting techniques in
Chapter 4.
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Unpacking Procedures
When unpacking your 24-Port Module:
1. Verify that the 24-Port Module is the model you ordered by checking
the model number listed on the side of the shipping carton (Model
Number 5124M-TPCL or Model Number 5124M-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 module from the shipping carton.
3. Remove the module from the antistatic shielding bag and inspect it
for damage. If the module appears to be damaged, replace it in the
antistatic shielding bag, return it to the shipping carton, and contact
your local supplier.
4. Keep the shipping carton and antistatic shielding bag in which your
module was shipped for repackaging the module for storage or
shipment.
5. Record the serial number of your 24-Port Module. A log for this and
other information specific to your modules is included in the ONline
System Concentrator Installation and Operation Guide, Appendix B,
Slot Usage Chart.
Setting the DIP Switches
This section describes:
❑ DIP Switch Overview
❑ DIP Switch Description
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DIP Switch Overview
The 24-Port Module has a single switch located on the module. This switch
contains 10 DIP switches that let you:
❑ Assign 12-ports on each 50-pin connector to a network (Model
Number 5124M-TPCL)
❑ Assign 12 ports on each Double Stack RJ-45 connector to a
network(Model 5124M-TP)
❑ Enable or disable all ports on each connector
❑ Establish Link Integrity for each connector (or group of 12 ports)
❑ Isolate all ports on one connector (or group of 12 ports)
❑ Isolate all ports on both connectors. This setting isolates the module
from the backplane.
Note: All DIP switch settings on the 24-Port Module are ignored if
an ONline management module (EMM Version v3.2 or later
[for Model Number 5124M-TPCL] EMM Version v4.3 or later
[for Model Numbner 5124M-TP]) is already installed in the
concentrator. 3Com recommends that you use network
management commands to configure the module instead
of the DIP switches. To override management and
configure the module to DIP switch settings in a managed
hub, enter the SET DEVICE DIP_CONFIGURATION
command.
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Figure 3-1 shows the location of the DIP switch component on the 24-Port
Module.
Figure 3-1. Model 5124M-TPCL and Model 5124M-TP DIP Switch
Location
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DIP Switch Description
DIP switches are labeled 1 through 10 (refer to Figure 3-1). DIP switches 1
through 4 enable features for connector 1 (CONN 1). DIP switches 5
through 8 enable features for connector 2 (CONN 2). DIP switch 9 isolates
all ports (both connectors) from the backplane, or 12 ports on either
connector. Modules or ports set to the same network communicate with
each other.
Note: The DIP switch label on the module circuit board refers to
the backplane connection as “channel” (CH). This is the
“network” setting.
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Tables 3-2 and 3-3 describe DIP switch settings. For a complete definition
of each DIP switch function, refer to the section Configuring the Module
later in this chapter.
Table 3-2. DIP Switch Settings
DIP
Switch
Factory
Default
DIP Switch Setting
Label
Function
Off
On
1
2
CH SEL0
CHSEL1
Select
Connector 1
Network
See Table 3-3.
3
4
PORT EN Enable/DisableC Enable
onnector 1 Ports
Disable
Disable
Enable
Enable
LI EN
Enable/Disable
Connector 1
Link Integrity
Enable
5
6
CH SEL 0 Select
Connector 2
Network
See Table 3-3.
CH SEL 1
7
8
PORT EN Enable/Disable
Connector 2
Enable
Enable
One
Disable
Enable
Enable
One
Ports
LI EN
Enable/Disable
Connector 2
Link Integrity
Disable
Both
9
ISO SEP Isolate
One/Both
Connectors
10
Not
None
Used
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The channel select switch settings (switches 1 and 2 for connector 1, and
switches 5 and 6 for connector 2) let you select a channel for each
connector. To reconfigure the module to a different channel, refer to the
information in Table 3-3.
Table 3-3. Channel (Network) Select DIP Sw itch Settings
DIP Switch
DIP Switch
Setting (CONN 1)
Setting (CONN 2)
Sw itch 1 Switch 2 Switch 5 Switch 6
Netw ork Selection
On
Off
On
Off
On
On
Off
Off
On
Off
On
Off
On
On
Off
Off
1 (default)
2
3
Isolated (connector
operates independent
of the three backplane
networks)
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Installing the Module
You do not need to power down the ONline System Concentrator to install
the 24-Port Module. You can insert the module while the concentrator is
operating (this is called a hot swap).
To install a 24-Port Module:
1. Depending on whether or not you have a management module
installed in the hub, follow one of the steps below:
❑ If network management is not available, set the DIP switches on
the board (if different than the default values). Refer to Table 3-2
and Table 3-3 for an explanation of the DIP switch settings.
❑ If a network management module is installed in your
concentrator:
–
If your management module is not EMM Version v4.3 or
later (for Model Number 5124M-TP) or EMM Version v3.2
or later (for Model Number 5124M-TPCL), it does not
support the particular 24-Port Module. Enter the SET
DEVICE DIP_CONFIGURATION command to configure the
24-Port Module from DIP switch settings.
–
If your management module is at the appropriate
software level, go to step 2 and complete the installation,
then configure the 24-Port Module using the commands
described in the Configuring the Module section.
2. For Model Number 5124M-TPCL, locate one open slot in the
concentrator. Remove the blank panel on the concentrator to expose
a slot for the module.
For Model Number 5124M-TP, locate two adjacent open slots in the
concentrator. If there are no adjacent open slots, remove two
adjacent blank panels on the concentrator to expose the slots you
need to install the module.
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3. Insert the module into the board guides at the top and bottom of the
selected slot and slide the board into the concentrator. Make sure
the connector is well-seated into the backplane of the concentrator.
Figure 3-2 shows the installation of a 24-Port Module.
Figure 3-2. Installing a 24-Port Module (Model Number 5124M-TPCL)
4. Fasten the spring-loaded screws on the front of the 24-Port Module
faceplate to the concentrator with your fingers (do not overtighten).
5. For the 5124M-TPCL model only, use the small screws included in the
shipping carton and attach 180° 50-pin cable connectors to the
50-pin connectors on the front of the module (refer to Figure 3-3) .
Note: If you are using 90° connectors, refer to the special
instructions provided in the section Using 90° Cable
Connectors.
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6. If you have installed Model Number 5124M-TPCL, attach and secure
cable connectors to module connectors as shown in Figure 3-3.
Figure 3-3. 24-Port Module Cable Connection
(Model Number 5124M-TPCL)
7. Attach the other ends of the cables to any of the following:
❑ A 10BASE-T transceiver
❑ A patch panel
❑ A 10BASE-T adapter card
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Using 90° Cable Connectors
3Com recommends that you use 180° connectors with the 5124M-TPCL
model. Because of the proximity of the two connectors, you must follow
the special steps described below if you decide to use 90° (right-angle)
connectors.
This section describes:
❑ Installing the Cable Tie-Wrap Kit
❑ Securing 90° Cables to the Module
Installing the Cable Tie-Wrap Kit
A cable tie-wrap kit is included with the 24-Port Module. If you use a cable
connector other than a 180° cable connector (for example, a 90° cable
connector), you must secure the cable to the module connector using the
tie-wrap kit.
The tie-wrap kit contains:
❑ Kit card containing kit part number
❑ 1 Phillips-head screw
❑ 1 Tie-wrap bracket
❑ 3 Tie-wraps
To install the tie-wrap kit:
1. Remove the hex nut from the bottom of the connector located on
the module faceplate.
2. Using the Phillips-head screw provided in the tie-wrap kit, attach the
tie-wrap bracket to the module (Figure 3-4).
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Figure 3-4. Attaching the Tie-Wrap Bracket to the Module
3. Insert the tie-wrap through the opening on the tie-wrap bracket.
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Securing 90° Cables to the Module
To secure 90° cables to the 24-Port Module connectors:
1. Remove the small cable-fastening screws from the shipping carton.
2. Remove the long screws (if present) from the 50-pin cables.
3. Attach a 50-pin cable connector to one of the 50-pin connectors on
the front of the module (see Figure 3-5).
Figure 3-5. Attaching Cables With 90° Connectors
(Model Number 5124M-TPCL)
Note: Due to the proximity of the top and bottom 50-pin
connectors, you must install a standoff if you intend to use
a right-angle connector on the top connection. Contact
your 3Com representative if you need more information.
Installing and Operating the Module 3 - 15
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4. Replace the small screw in the top screw hole of the 50-pin cable
connectors to secure the cables to the module connectors as shown
in Figure 3-5.
Note: Do not overtighten the top screw on either connector.
Over tightening the top screw can cause the bottom part
of the connector to lift and disconnect the lower pins on
the cable from the lower pins on the module connector.
5. Wrap the tie-wrap around the cable connector to secure the cable
connector to the module connector (see Figure 3-6). Do not fasten
the tie-wrap around the module ejectors.
Figure 3-6. Attaching Cables With 90° Connectors
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6. Attach the other ends of the cables to any of the following:
❑ A 10BASE-T transceiver
❑ A patch panel
❑ A 10BASE-T adapter card
Configuration in a Managed Environment
With an EMM already installed, all DIP switch settings on the 24-Port
Module are ignored. For this reason, 3Com recommends that you use
network management commands instead of DIP switches to configure the
module.
Note: Do not use a slave management module to manage (for
example, configure or get statistics for) a 24-Port Module.
Note: To fully support Model Number 5124M-TPCL, you must have
EMM Version v3.2 or later. To fully support Model Number
5124M-TP, you must have EMM Version v4.30 or later.
The following sections describe important module configuration issues and
settings you can configure for both models of the 24-Port Module:
❑ If Management is Not Available
❑ Before Configuring the Module
❑ Enabling Ports
❑ Enabling Port Redundancy
❑ Enabling Link Integrity
❑ Selecting a Network
Installing and Operating the Module 3 - 17
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❑ Enabling Remote Diagnostics Mode
❑ Setting the Autopartition Threshold Value
For additional information on any network management command
described in this section, refer to the appropriate ONline Management
Module Installation and Operation Guide.
If Management is Not Available
When you first install the 24-Port Module in an unmanaged concentrator,
configure the 24-Port Module using the DIP switches as described in the
section Setting the DIP Switches. For additional information on all network
management features, refer to:
❑ The appropriate ONline Management Module Installation and
Operation Guide, or the ONcore Distributed Management Module
User's Guide
❑ The ONline Management Commands Guide or the ONcore
Distributed Management Module Commands Guide
Note: The 24-Port Module, Model Number 5124M-TP, is a 2-slot
module that has a double-wide faceplate but only one
circuit board. The slot number of the circuit board
determines the slot number of an installed 5124M-TP
module.
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Before Configuring the Module
When you first install the 24-Port Module in a managed concentrator:
1. The network (channel) defaults to isolated mode and all ports are
automatically disabled so unapproved stations cannot be added.
Therefore, you must use management commands to:
–
–
Enable ports you want to use
Assign enabled ports to backplane networks
2. All other module settings retain DIP switch default values.
Enabling Ports
You can enable or disable each of the ports on the 24-Port Module. When
a port is enabled, it can transmit to and receive data from the network
(channel) that the module or connector (bank) is assigned to.
To enable a port, use the following network management command:
SET PORT {slot.port} MODE {enable}
{slot.all}
{disable}
Enabling Port Redundancy
Network management lets you set redundancy between ports. When you
set two ports redundant to each other, the secondary port takes over if the
primary port fails.
To set redundancy between ports, use the following management
command:
SET PORT {slot.port} MODE {redundant} {slot.port}
{non-redundant}
Refer to Chapter 2 for an example of port redundancy.
Installing and Operating the Module 3 - 19
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Enabling Link Integrity
Use the following guidelines to determine whether to enable or disable
Link Integrity:
❑ Enable Link Integrity for all ports on the 24-Port Module for networks
that comply with the 10BASE-T standard.
❑ Disable Link Integrity only when connecting to older equipment that
does not comply with the 10BASE-T standard.
The Link Integrity setting at both ends of a connection must be either
enabled or disabled. If Link Integrity settings are not configured to the
same setting, the 24-Port Module with Link Integrity enabled reports a Link
Integrity error.
The Link Status LED for each connector (bank) will be on solid if the Link
Integrity is valid for ports which are both enabled and have Link Integrity
enabled. If all enabled ports have Link Integrity testing disabled the LED is
also on solid. In all other cases the LED will blink in approximately 1-second
intervals.
Note: In an unmanaged concentrator, you can only enable or
disable Link Integrity for each connector on the module.
To enable Link Integrity for a port:
SET PORT {slot.port} LINK_INTEGRITY {enable}
{slot.all}
{disable}
Selecting a Network
The ONline Ethernet 24-Port Module provides bank-level configuration
flexibility.
To assign all 24 ports on the module to one of three backplane networks,
use the following management command:
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SET MODULE {slot} NETWORK {ethernet_1}
{ethernet_2}
{ethernet_3}
{isolated}
To assign a specific connector (bank of 12 ports) to a network, use the
following management command:
SET MODULE {slot} CONNECTOR_{1}_NETWORK {ethernet_1}
{2}
{ethernet_2}
{ethernet_3}
{isolated_1}
{isolated_2}
Note: Assigning one connector to ISOLATED_1 and the other
connector to ISOLATED_2 creates two isolated 12-port
subnetworks. Assigning both connectors to the same
isolated network creates a single 24-port isolated network.
Enabling Remote Diagnostics Mode
When used with a 3Com Fault-Tolerant 10BASE-T Transceiver, remote
diagnostics mode allows the 24-Port Module to detect certain unusual
failure conditions (including disruption of single wires in the twisted pairs).
Refer to the Fault-Tolerant 10BASE-T Transceiver Installation Guide for
more information on this feature.
To enable remote diagnostics mode for a specific port, use the following
management command:
SET PORT {slot.port} MODE {remote_diagnostics}
{non_remote_diagnostics}
{slot.port}
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Setting the Autopartition Threshold Value
To set the maximum number of data collisions an installed management
module allows on a port before it partitions the port, use the following
management command:
SET MODULE {slot} AUTOPARTITION_THRESHOLD {31_coll}
{63_coll}
{127_coll}
{255_coll}
You can set the autopartition threshold value to one of the following:
❑ 31
❑ 63 (default value)
❑ 127
❑ 255
The proper setting for most network environments is 63 (the default). The
10BASE-T specification suggests a minimum autopartition threshold value
of 31, but 31 collisions may cause ports to partition more frequently than
necessary.
Note: Autopartition values 127 and 255 are suggested only for
debugging purposes, and are not recommended for use in
live networks.
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Saving Module Configurations
After you make configuration changes to a module and ports, you must
issue the SAVE MODULE_PORT command to save the new settings.
Showing Module Configurations
You can display status information about the 24-Port Module using the
following network management commands:
❑ SHOW MODULE
❑ SHOW PORT
This section describes these commands. Screen output examples are also
provided.
For more information, refer to the ONline Ethernet Management Module
Installation and Operation Guide.
Note: When the command argument NO_VERBOSE is an option,
you do not have to type NO_VERBOSE, NO_VERBOSE is the
default.
Installing and Operating the Module 3 - 23
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Show Module
To display information for a module in a specific slot, use the following
management command:
SHOW MODULE {slot} {no_verbose}
{verbose}
To display basic information about a 24-Port Module installed in slot 3,
specify the NO_VERBOSE command argument, as shown below:
ONline> show module 3
Slot Module Version
03 5124M-TPCL 001
[ENTER]
Network
ETHERNET_2 Port (s) are down
General Information
Note: The NO_VERBOSE command argument is the default (you
do not have to enter it at the prompt).
To display detailed information about an installed 24-Port Module, specify
the verbose command argument, as shown below:
ONline> show module 3 verbose [ENTER]
Slot Module
Version
Network
ETHERNET_2
General Information
Port (s) are down
03
5124M-TPCL 001
5124M-TPCL:
ONline Ethernet 24-PORT 10BASE-T Module
Auto-Partition Threshold
Module Per Port Counters
Network for Connector 01
Network for Connector 02
: 255 COLLISIONS
: CONNECTOR 1
: ETHERNET_2
: ETHERNET_2
Dip Network Setting for Connector 01 : ETHERNET_1
Dip Network Setting for Connector 02 : ISOLATED_1
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Show Port
To display information for a specific port, use the following management
command:
SHOW PORT {slot.port} {no_verbose}
{slot.all} {verbose}
To display basic information for a specific port, specify the NO_VERBOSE
command argument. To display basic information for all ports on the
24-Port Module, specify the ALL command argument.
Note: The NO_VERBOSE command argument is the default (you
do not have to enter it at the prompt).
In the following example, SHOW PORT ALL displays basic information for all
ports on the 24-Port Module installed in slot 5:
ONline> show port 5.all [ENTER]
Port Display for Module 5124M-TPCL :
Port Mode
————— ————
05.01 DISABLED OKAY
05.02 ENABLED OKAY
05.03 ENABLED OKAY
05.04 DISABLED OKAY
Status
——————
Network
———————
ISOLATED
ISOLATED
ISOLATED
ISOLATED
General Information
———————————————————
.
.
.
Installing and Operating the Module 3 - 25
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To display detailed information for all ports on the 24-Port Module, specify
the VERBOSE command argument. In the following example, SHOW PORT
ALL VERBOSE displays detailed information for all ports on the 24-Port
Module installed in slot 17 (only the output for ports 1 and 2 is shown):
ONline> show port 17.all verbose [ENTER]
Port Display for Module 5124M-TPCL :
Port Mode
————— ————
17.01 DISABLED OKAY
Status
——————
Network
———————
ISOLATED
General Information
———————————————————
Port Connector:
TELCO
Mode Dip Setting:
Link Integrity:
Link Integrity Dip Setting:
ENABLED
ENABLED
ENABLED
17.02 DISABLED OKAY
ISOLATED
Port Connector:
TELCO
Mode Dip Setting:
Link Integrity:
Link Integrity Dip Setting:
ENABLED
ENABLED
ENABLED
.
.
.
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Gathering Network Statistics
When you assign all ports on the 24-Port Module to the same network, an
installed management module can simultaneously monitor all ports on one
connector individually as it monitors the ports on the other connector
collectively.
For example, you can use an installed EMM or Distributed Management
Module (DMM) to simultaneously:
❑ Monitor ports 1 through 12 individually
❑ Sum up statistics for ports 13 through 24 at a single “logical port”
(port 13)
Gathering statistics for individual ports on one connector enables network
management to provide a detailed statistical view of each port on that
connector. Collective statistics gathering for all ports on the other
connector ensures you have at least a high-level statistical view of ports on
that connector.
An ONline management command lets you switch to monitor the other
connector. The following section describes the SET MODULE command.
Installing and Operating the Module 3 - 27
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Selecting the Per-Port Counters Connector
When you select a connector, network management monitors the other
connector collectively, reporting statistics for all 12 ports as a single “port.”
To select which 12-port connector you want network management to
gather counter statistics for:
SET MODULE {slot} PER_PORT_COUNTERS_CONNECTOR {1}
{2}
If you ask for information on a port that is not being monitored individually,
network management displays summary statistics and instructions for
getting more information on the selected port.
Note: The MONITOR PORT and SHOW COUNTER PORT
commands will function normally for the connector you
have selected.
Note: Changing which connector you are monitoring clears all
statistics counters. Use the CLEAR COUNTERS command to
erase extraneous statistics gathered during the switchover
from one connector to the other connector.
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The LEDs on the front panel of the 24-Port Module allow you to monitor
the status of 12 ports on each connector. The 24-Port Module has an
Activity LED and a Status LED for each connector.
Figure 3-7 shows the location of the LEDs on Model Number 5124M-TPCL.
Figure 3-7. 24-Port Module Faceplate and ONline System
Concentrator (Model Number 5124M-TPCL)
Installing and Operating the Module 3 - 29
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Figure 3-8 shows the location of the LEDs on Model Number 5124M-TP.
Figure 3-8. 24-Port Module Faceplate and ONline System
Concentrator (Model Number 5124M-TP)
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Table 3-4 describes the LEDs for ModelNumbers 5124M-TPCL and 5124M-TP.
Table 3-4. 24-Port Module LED Interpretations
LED Name
Activity
(Ports 1 to 12)
(Ports 13 to
24)
Color
State
Off
Indicates
Yellow
No packets are received on the
ports on this connector.
On
Constant activity on this
connector.
Blinking
On
Normal activity on this
connector.
Status
Green
Connector enabled and links OK
or Link Integrity disabled.
(Ports 1 to 12)
(Ports 13 to
24)
1 blink
Link failure on one or more
ports.
2 blinks
Off
One or more ports partitioned.
Connector disabled.
Installing and Operating the Module 3 - 31
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Verifying LED and Network Assignments
Once you install the 24-Port Module, verify module operation using the
front panel of the ONline Controller Module.
Using the LED Check Button
The ONline Controller Module is equipped with an LED check button on the
front panel. Use the LED check button to:
❑ Verify LED operation
❑ Verify network (channel) assignment
The LED check button:
❑ Causes all LEDs in all modules in the concentrator to light
❑ Causes each installed module to identify the network to which it is
assigned
When you press the LED check button, the Controller Module initiates a
test of all modules in the concentrator.
❑ All LEDs should respond by lighting continuously for approximately 5
seconds.
❑ Any LED that does not light is defective.
After 5 seconds elapse, the diagnostic continues with a network (channel)
check of all installed modules.
❑ Port Status LEDs on each installed module should blink the number of
times corresponding to the network to which that module (or
connector) is assigned.
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❑ If the module is in isolated mode, the Port Status LEDs on that
module (or connector) do not light.
❑ Activity LEDs remain on during the network check sequence.
The network check sequence repeats at least three times, and each check
sequence lasts for approximately 30 seconds.
Table 3-5 explains the network check codes.
Table 3-5. Network Check Codes
LED State
1 Blink
Netw ork Configuration
Connector is configured for network 1
Connector is configured for network 2
Connector is configured for network 3
Connector is isolated from backplane networks
2 Blinks
3 Blinks
Off
Installing and Operating the Module 3 - 33
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Troubleshooting
4
This chapter describes fault conditions and troubleshooting procedures for
the ONline Ethernet 24-Port Modules, Model Numbers 5124M-TPCL and
5124M-TP.
This chapter contains the following sections:
❑ Troubleshooting Using the Port Status LEDs
❑ Troubleshooting Using the Port Activity LEDs
❑
Technical Assistance
Troubleshooting 4 - 1
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Troubleshooting Using the Port Status and Port
Activity LEDs
In certain situations, the Port Status and Port Activity LEDs may not light.
This section describes troubleshooting using the:
❑ Port Status LEDs
❑ Port Activity LEDs
Troubleshooting Using the Port Status LEDs
A blinking Port Status indicator signals a problem with a port or a link
connected to a port. 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.
Note: LEDs provide accurate information only when unused ports
are disabled.
Table 4-1. Troubleshooting Using the Port Status LEDs
LED State
Indication
Possible Cause
Corrective Action
1 Blink
Link Failure
Cable not
Connect cable.
connected.
Cable defective.
Check cables with
cable tester.
Repair or replace
cables.
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Table 4-1. Troubleshooting Using the Port Status LEDs (Continued)
LED State
Indication
Possible Cause
Corrective Action
1 Blink
(continued)
Link Failure
(continued)
Link Integrity
mismatch.
Make sure that
both ends of the
connection have
the same Link
Integrity setting.
2 Blinks
Port
Partitioned
Faulty cable.
Check cable with
cable tester.
Repair or replace
cable.
Network
overloaded.
Reassign users to
another network
to balance the load.
Off
Ports
Ports disabled.
Enable ports.
Disabled
24-Port Module
not powered up.
Check the
Controller Module
Power LEDs.
Broken LED.
Press the LED test
button on the
Controller Module.
Bad 24-Port
Module.
Replace module.
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Troubleshooting Using the Port Activity LEDs
Under some conditions a Port Activity LED may not light. Use the
troubleshooting suggestions in Table 4-2 to help determine why this has
occurred and to isolate the source of the problem.
Table 4-2. Troubleshooting Using the Port Activity LEDs
LED State
Possible Cause
Corrective Action
None.
Off
There is no traffic
received from the
segments (normal).
Hub power is off.
Check the Controller
Module Power LEDs.
The Activity LED has
burned out.
Press the LED test button
on the Controller Module.
A 24-Port Module port Connect the cable to a
is faulty.
different port.
The module
Re-insert the 24-Port
connection to the
backplane is bad.
Module. If this fails to
correct the problem, try
another concentrator slot.
The 24-Port Module is
faulty.
Try a different 24-Port
Module.
Technical Assistance
Refer to Appendix B for instructions on contacting Technical Support for
your product.
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Specifications
A
This appendix lists specifications for the ONline Ethernet 24-Port Module
(Model Numbers 5124M-TPCL and 5124M-TP).
This appendix contains the following sections:
❑ General Specifications
❑ Power Specifications
❑ Environmental Specifications
❑ Mechanical Specifications
❑ Twisted Pair Cable and Connector Specifications
Specifications A - 1
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General Specifications
Table A-1 defines general specifications for the 24-Port Module.
Table A-1. 24-Port Module General Specifications
Specification
Value
5124M-TP, 5124M-TPCL
Model Number
Ports Per Module
Data Rate
24
10 Mbps (million bits per second)
Differential Manchester
Data Modulation
External Connectors Model Number 5124M-TP:
2 Double Stack RJ-45 Connectors
(12 ports per connector)
Model Number 5124M-TPCL:
2 Telco 50-pin Connectors
(12 ports per connector)
Recommended
Cable Types
Supports UTP, STP, and 120 ohm Cabling Systems
Maximum Number
of Stations
1024
Backplane Interface 96-pin edge connector of the ONline System
Concentrator or ONcore Switching Hub
Installation
Attachment
2 thumbscrews on the mounting bracket
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Table A-1. 24-Port Module General Specifications (Continued)
Specification
ONline
Value
ONline Fault-Tolerant Controller Module (Model
Numbers 5000M-RCTL, 5000M-RCLS)
Requirements
A Fault-Tolerant Controller Module is not required
if you have a 6-Slot ONline System Concentrator
with Integrated Controller (Model Numbers
5006C-HC, 5006C-HC-FT).
A 325 watt power supply and the corresponding
325 watt Power Switching Board is required for
the17-Slot ONline System Concentrator
Power Specifications
Table A-2 lists power specifications for the 24-Port Module.
Table A-2. 24-Port Module Pow er Specifications
Power Specifications
Values
Backplane Interface
Two 96-pin edge connectors,
compatible with the ONline
System Concentrator and ONcore
Switching Hub
Power Requirements
Power Consumption
Fuse
2.0 Amps @ 5 V
10 watts
4.0 Amps Fast Blow
Specifications A - 3
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Table A-3 lists fuse specifications for the 24-Port Module.
Table A-3. 24-Port Module Fuse Specifications
Fuse Specifications for 24-Port Module
.5 Amp for 12 V FAILSAFE
4 Amp for 5 V
Environmental Specifications
Table A-4 lists environmental specifications for the 24-Port Module.
Table A-4. 24-Port Module Environmental Specifications
Environmental Specifications
Values
Operating Temperature
Storage Temperature
Humidity
0° to 50° C (32° to 122° F)
-30° to 65° C (-22° to 149° F)
5% to 95%, non-condensing
30
BTUs/hour
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Mechanical Specifications
Table A-5 lists mechanical specifications for the 24-Port Module.
Table A-5. 24-Port Module Mechanical Specifications
Mechanical
Specifications
5124M-TPCL Values
5124M-TP Values
Dimensions
2.54 cm W x 27.31
cm L x 21.6 cm H
5.08 cm W x 27.31 cm L x
21.6 cm H (2.0" x 10.75" x
(1.0" x 10.75" x 8.5") 8.5")
Weight
0.57 kg (1.25 lb.) 0.68 kg (1.5 lb.)
Twisted Pair Cable and Connector Specifications
You can use many types of cables and connectors to link a 24-Port
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 you install all equipment.
This section describes:
❑ Twisted Pair Cable Specifications
❑ Twisted Pair Connector Specifications
❑ RJ-45 Connector Pinouts
❑ 50-Pin Connector Pinouts
❑ Connecting Twisted Pair Cables
Specifications A - 5
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Twisted Pair Cable Specifications
The cables that are supported must meet the following specifications:
❑ 22, 24, or 26 gauge twisted pair cable
❑ 80 to 150 ohm impedance
❑ Minimum of 2 pairs
A pair is usually a solid color wire twisted with a striped wire of the same
color.
Table A-6 lists the specifications for IBM cable types 1, 2, 6, and 9. These
cable types are IEEE 802.5 compliant and are ETL (ETL Testing Laboratories)
verified.
Table A-6. IBM Tw isted Pair Cable Specifications
No. of
Pairs
Nominal
Impedance
IBM Type
AWG
Shielding
1
2
6
22 (solid
bare
copper)
Data pairs individually 150 ohms
foil shielded plus 65%
tinned copper braid
(non-plenum)
2
22 (solid
bare
copper)
Data pairs individually Data 150
foil shielded plus 65% ohms
(non-plenum) (data 2)
(voice 4)
tinned copper braid.
Voice pairs
Voice 105
ohms
non-shielded*
6
2
2
26 (7x34
bare
copper)
Overall foil shielded
pairs plus 65% tinned
copper braid
150 ohms
150 ohms
(non-plenum)
9 (plenum)
26 (7x34
bare
copper)
Individually foil
shielded plus 65%
tinned copper braid
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Note that the non-plenum type 1, 2, and 6 cables are insulated with
polyethylene. The plenum type 9 cable is insulated with polyvinylchloride.
*Voice pairs in the IBM Type 2 cable cannot be used for Token Ring data
transmission.
Twisted Pair Connector Specifications
The IEEE 802.3 10BASE-T standard for RJ-45 pinouts must be used, as
described below. 10BASE-T uses only 2 of 4 pairs of wire: pins 1 & 2 and
pins 3 & 6. If the pairs are not configured this way, the connection will not
work properly.
Level 3 or higher cable should have the following pin pairings:
❑ Pair 1 is pins 4 and 5 (not used)
❑ Pair 2 is pins 3 and 6
❑ Pair 3 is pins 1 and 2
❑ Pair 4 is pins 7 and 8 (not used)
Refer to Figure A-1 for an example of the recommended TIA-568A standard
pinouts for this connector and cable.
RJ-45 Connector Pinouts
Figure A-1 shows RJ-45 connector pin assignments for the 24-Port Module,
Model Number 5124M-TP. This model uses MDI-X (crossed-over) wiring and
only uses:
❑ Pins 1 and 2 (station transmit) - 5124M-TP receive
❑ Pins 3 and 6 (station receive) - 5124M-TP transmit
Specifications A - 7
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Figure A-1. 24-Port Module RJ-45 Connector Pinouts
50-Pin Connector Pinouts
Figure A-2 provides examples of a 50-pin cable (male) connector and a
50-pin (female) connector on the 24-Port Module.
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Figure A-2. 50-Pin Male and Female Connectors
Table A-7 (next page) lists the receive and transmit pairs, pinouts, and port
assignments for a 50-pin cable.
Specifications A - 9
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Table A-7. 50-Pin Cable Pinouts and Port Assignments
Hub
Function/
Polarity
Transceiver
Function
/ Polarity
Hub
Function
/ Polarity
Transceiver
Func-tion
/ Polarity
Hub
Port#
Hub
Pin#
Hub
Port#
Hub
Pin#
Port 1
Port 1
Port 1
Port 1
Port 2
Port 2
Port 2
Port 2
Port 3
Port 3
Port 3
Port 3
Port 4
26
1
RX, +
RX, -
TX, +
TX, -
RX, +
RX, -
TX, +
TX, -
RX, +
RX, -
TX, +
TX, -
RX, +
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
Port 7
Port 7
Port 7
Port 7
Port 8
Port 8
Port 8
Port 8
Port 9
Port 9
Port 9
Port 9
38
13
39
14
40
15
41
16
42
17
43
18
44
RX, +
RX, -
TX, +
TX, -
RX, +
RX, -
TX, +
TX, -
RX, +
RX, -
TX, +
TX, -
RX, +
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
27
2
28
3
29
4
30
5
31
6
32
Port
10
Port 4
Port 4
Port 4
7
33
8
RX, -
TX, +
TX, -
TX, - (2)
RX, + (3)
RX, - (6)
Port
10
19
45
20
RX, -
TX, +
TX, -
TX, - (2)
RX, + (3)
RX, - (6)
Port
10
Port
10
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Table A-7. 50-Pin Cable Pinouts and Port Assignments (Continued)
Hub
Function/
Polarity
Transceiver
Function
/ Polarity
Hub
Function
/ Polarity
Transceiver
Func-tion
/ Polarity
Hub
Port#
Hub
Pin#
Hub
Port#
Hub
Pin#
Port 5
Port 5
Port 5
Port 5
Port 6
Port 6
Port 6
Port 6
34
9
RX, +
RX, -
TX, +
TX, -
RX, +
RX, -
TX, +
TX, -
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
Port
11
46
21
47
22
48
23
49
24
RX, +
RX, -
TX, +
TX, -
RX, +
RX, -
TX, +
TX, -
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
TX, + (1)
TX, - (2)
RX, + (3)
RX, - (6)
Port
11
35
10
36
11
37
12
Port
11
Port
11
Port
12
Port
12
Port
12
Port
12
50
25
Not Used
Not Used
Not Used
Not Used
Specifications A - 11
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Connecting Twisted Pair Cables
Follow these steps to connect twisted pair cables:
1. Connect cables at the active concentrator location.
2. Connect transceivers.
Refer to the ONline System Concentrator Installation and Operation Guide
for more information about the ONline System Concentrator connections.
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Technical Support
B
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 Publications
On-line Technical Support
3Com offers worldwide product support through the following on-line
systems:
❑ Email Technical Service
❑ World Wide Web Site
Technical Support B - 1
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Email Technical Support
You can contact the Integrated Systems Division (formerly Chipcom) on the
Internet for 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 releases, selected
™
articles from 3TECH , the 3Com award-winning technical journal, 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 divisions.
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.
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When you contact your network supplier for assistance, have the following
information ready:
❑ Diagnostic error messages
❑ A list of system hardware and software, including revision levels
❑ Details about recent configuration changes, if applicable
If you are unable to contact your network supplier, see the following
section on how 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
Belgium
Denmark
Finland
France
Telephone Number
0800 71429
800 17309
Country
Netherlands
Norway
Spain
Telephone Number
06 0227788
800 11376
0800 113153
05 917959
900 983125
Sweden
U.K.
020 795482
Germany
Ireland
Italy
0130 821502
1 800 553117
1678 79489
0800 966197
800 876-3266
U.S.
Technical Support B - 3
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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.
Returning Products for Repair
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 Integrated Systems Division products
(formerly Chipcom), use the following numbers.
Country
Telephone Number
Fax Number
(508) 787-3400
No Fax
U.S. and Canada (800) 724-2447
Europe
(44) (1442) 275860
(508) 787-5296
Asia Pacific
(508) 787-3400
Accessing the 3Com MIB
The 3Com Management Information Base (MIB) for the Integrated Systems
Division describes commands that enable you to manage 3Com
SNMP-based products. The MIB is available over the Internet on an
anonymous FTP server. Updates 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 name anonymous.
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3. Enter your full Internet e-mail address as the password
4. Change to the mib or schema directory using the cd /pub/mibsor
cd /pub/mibs/schemascommand.
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 FTP session, invoke the quitcommand.
3Com Technical Publications
If you have comments or questions on 3Com Integrated Systems Division
Technical Publications documents, please contact the Technical Publications
group by FAX (508) 229-1551.
Technical Support B - 5
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Index
Numerics
10BASE-FB Links
B
Backbone Cabling, 2-7
Determine Maximum Distance, 2-7
10BASE-FB Module
Serial Wiring, 2-9
Star Wiring, 2-8
Fiber Backbone, UTP-to-the-Desk, 2-10
Port Redundancy, 2-15
Serial Configuration, 2-9
Star Configuration, 2-8
24-Port Module
bulletin board service, B-3
C
Cabling
Connectors, A-7
Activity LEDs, 4-4
Redundant Links, 2-16, 2-17
Twisted Pair Backbone, 2-12
Configuration Rules
Features, 1-2
Hot Swap Capability, 1-2
Installing, 3-10
General, 2-3, 2-5
Port Status LEDs, 4-2
Twisted Pair Backbone, 2-12
Crossover Mode, 1-3
Procedures for Handling, 3-2
Theory of Operation, 1-4
Unpacking Procedures, 3-4
24-Port Module LEDs
D
Interpreting, 3-31
DIP Switches
Location, 3-5
Dip Switches, 3-5
Setting, 3-4
3Com Bulletin Board Service (3ComBBS), B-3
50-Pin Cable
Pinouts and Port Assignments, A-10
50-Pin Connector, A-8
E
A
Electro-Static Discharge
Precautionary Procedures, 3-2
Ethernet
Activity LEDs
Troubleshooting With, 4-4
Attenuation, 2-7
Four-Repeater Rule, 2-12
Ethernet Distance Limitations, 2-2
Audience of Manual, xiii
Index 1
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Saving, 3-23
Showing, 3-23
F
Fault-Tolerant Controller Module, A-3
FCC notice, ii
Features, 1-1
Fiber Link Distances, 2-5
Fiber Module Configurations, 2-10
Front Panel
N
Network
Unshielded Twisted Pair, 2-13
Network Check Codes, 3-33
Network Selection
Monitoring, 3-29
Per Connector, 3-21
Front Panel Indicators
Activity LEDs, 3-29, 3-31
Status Indicators, 3-29
Status LEDs, 3-31
network supplier support, B-2
O
ONline Network Management Module, 3-19
ONline System Concentrator
Hot Swap Capabilities, 3-10
on-line technical services, B-1
G
General Specifications, A-5
I
P
Installation
Patch Panels, 2-14
Port Redundancy, 3-19
Switchover Conditions, 2-17
Ports
180 Connector, 3-11
90 Connectors, 3-15
Hot Swap Capabilities, 3-10
Installing The Module, 3-11
Quick Installation Chart, 3-2
Installing the 24-Port Module, 3-10
Installing the Module, 3-2
Configuring Using Network Management,
3-19
R
L
Redundancy, 2-17
Redundant Links, 2-16
returning products for repair, B-4
LAN Product Equivalent Distances, 2-6
LED and Network Verification, 3-32
Link Integrity
Configuring Using Network
Management, 3-20
Description, 3-20
S
Serial Configuration, 2-9
Showing Module Configurations, 3-23
SNMP Commands, B-4
Specifications
M
MIB, B-4
Environmental, A-4
Fuses, A-3
Module Configurations
2 Index
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Power, A-3
Star Configuration, 2-8
Star Topology, 2-3
Status LEDs
Troubleshooting Using, 4-2
T
technical support, B-1
Troubleshooting
Port Activity LEDs, 4-4
Using Port Status LEDs, 4-2
Twisted Pair
Cables, A-6, A-12
Connectors, A-7
Twisted Pair Cables
Connecting, A-12
Twisted Pair Configuration
Redundant Links, 2-16
U
Unpacking Procedures, 3-4
Unshielded Twisted Pair, 2-12
V
VDE compliance, ii
Index 3
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