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3Com CoreBuilder 5000 User Manual

3Com CoreBuilder 5000 User Manual

Ethernet 24-port 10base-t module
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Document Number 17-00367-3
Published May 1997
CoreBuilder
Ethernet 24-Port 10BASE-T
Module User Guide
5000
™

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  • Page 1 CoreBuilder 5000 ™ ® Ethernet 24-Port 10BASE-T Module User Guide http://www.3com.com/ Document Number 17-00367-3 Published May 1997...
  • Page 2 95052-8145 3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change. 3Com Corporation provides this documentation without warranty of any kind, either implied or expressed, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
  • Page 3 NS/G/12345/J/100003 for indirect connection to the public telecommunication network. Trademarks Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries. 3Com, Boundary Routing, CardFacts, EtherLink, LANplex, LANsentry, LinkBuilder, NETBuilder, NETBuilder II, NetFacts, Parallel Tasking, SmartAgent, TokenDisk, TokenLink, Transcend, TriChannel, and ViewBuilder are registered trademarks of 3Com Corporation.
  • Page 4 SPARCstation is a trademark licensed exclusively to Sun Microsystems Inc. OPEN LOOK is a registered trademark of Unix System Laboratories, Inc. UNIX is a registered trademark of X/Open Company, Ltd. in the United States and other countries. Other brand and product names may be registered trademarks or trademarks of their respective holders.

  • Page 5: Table Of Contents

    UIDE Audience Structure of This Guide Document Conventions Related Documents 3Com Documents Reference Documents NTRODUCTION The CoreBuilder 5000 Ethernet 24-Port 10BASE-T Module Application Theory of Operation Where To Go From Here ESIGNING AND XPANDING THE ETWORK Understanding the General Rules...
  • Page 6 3-20 Show Counter Command 3-21 Monitoring the Front Panel 3-22 LED and Network Verification 3-23 Using the CoreBuilder 5000 Controller Module to Verify LED Operation 3-23 Using the DMM to Verify Network Connections 3-24 Where To Go From Here 3-24...
  • Page 7 Twisted Pair Cables Connecting Twisted Pair Cables ECHNICAL UPPORT Online Technical Services World Wide Web Site 3Com Bulletin Board Service Access by Analog Modem Access by Digital Modem 3ComFacts Automated Fax Service 3ComForum on CompuServe Online Service Support From Your Network Supplier...
  • Page 8 NDEX ORPORATION IMITED ARRANTY viii...
  • Page 9 3-10 3-5 Attaching the Tie-Wrap Bracket to the 24-Port Module 3-11 3-6 Attaching Cables with 90° Connectors 3-12 3-7 Attaching the CoreBuilder 5000 Ethernet Monitor Card 3-19 3-8 24-Port Module Faceplate 3-22 A-1 50-Pin Cable Male and Female Connectors A-2 RJ-45 Connector Pinouts...
  • Page 11 ABLES 2-1 Seven Basic Network Rules 2-2 LAN Product Equivalent Distances 2-3 Network Reorganization 2-11 3-1 Procedures for Completing Installation 3-2 Channel Select DIP Switch Settings 3-3 Interpretation of the 24-Port Module LEDs 3-23 4-1 Troubleshooting with the Module Status LED 4-2 Troubleshooting With the Status LEDs 4-3 Troubleshooting With the Activity LEDs A-1 50-Pin Cable Pinouts and Port Assignments...

  • Page 13: Ow To Use This Guide

    OW TO UIDE This guide explains how to install and operate the 3Com ™ CoreBuilder 5000 Ethernet 24-Port 10BASE-T Module (referenced throughout this guide as 24-Port module). It also includes information ® on monitoring this module using a 3Com CoreBuilder 5000 Distributed Management Module.

  • Page 14: Structure Of This Guide

    Chapter 3, Installing and Operating the Module – Provides illustrated procedures for installing the 24-Port module into the CoreBuilder 5000 hub. 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.

  • Page 15: Document Conventions

    Document Conventions Document The following document conventions are used in this manual: Conventions Convention Indicates Example Courier text User input In the Agent Information Form, enter MIS in the New Contact field. System output After pressing the Apply button, the system displays the message Transmitting data.

  • Page 16: Related Documents

    CoreBuilder 5000 Integrated System Hub Installation and Operation Guide – Provides information on the installation, operation, and configuration of the CoreBuilder 5000 Integrated System Hub. This guide also describes the principal features of the CoreBuilder 5000 Fault-Tolerant Controller Module. Distributed Management Module User Guide – Provides information on the CoreBuilder 5000 Distributed Management Module’s operation,...

  • Page 17: Introduction

    CoreBuilder 5000 hub, refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide. The CoreBuilder The CoreBuilder 5000 Ethernet 24-Port Module is an IEEE 802.3 5000 Ethernet repeater module that complies with the 10BASE-T standard. It connects 24-Port 10BASE-T up to 24 devices (PCs, terminals, printers, modems, etc.) to the...
  • Page 18 RAM (NVRAM). Such information includes the module’s serial number, power requirements, power class settings (i.e., power-up priority) and date of manufacture. Supports the CoreBuilder 5000 power management system which enables administrators to prioritize the allocation of power to modules.

  • Page 19: Application

    The CoreBuilder 5000 Ethernet 24-Port 10BASE-T Module Module Status LED Port Status LEDs Port Activity LEDs 50-Pin connector (ports 1 - 12) 50-Pin connector (ports 13 - 24) Figure 1-1 CoreBuilder 5000 Ethernet 24-Port Module Application This module can be attached via bundled 25-pair or 12-leg hydra cables...

  • Page 20: Theory Of Operation

    Transceivers receive and restore amplitude to incoming signals. A repeater restores phase and frequency. Repeated signals synchronize to the system clock and enter on the CoreBuilder 5000 hub's backplane. Outgoing signals from the backplane are sent directly to transceivers to be transmitted to twisted pair link segments.

  • Page 21: Designing And

    ™ describes how to configure networks that use the CoreBuilder 5000 hub and the CoreBuilder 5000 Ethernet 24-Port Module. It also provides examples of network cabling structures and Ethernet network cabling solutions. This chapter outlines the following topics: Understanding the General Rules...

  • Page 22: Understanding The General Rules

    The following topics are discussed: 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 24-port module, refer to Appendix Table 2-1...
  • Page 23 In general, on 62.5 micron cable, you not exceed the limits can go up to 4000 meters point-to-point imposed by the optical power using the CoreBuilder 5000 or ONline budget. fiber modules. If you have poor quality cable or cross many patch panels, you may have to sacrifice some distance.

  • Page 24: Lan Equivalence

    Table 2-2 LAN Product Equivalent Distances Equivalent LAN Product Distance (meters) CoreBuilder 5000 Ethernet 10BASE-T Module (6124M-TPL6) Incoming signal to TP port Outgoing signal from TP port ONline Ethernet 10BASE-T Modules (5124M-TPCL, 5221M-TP, 5112M-TPL, 5112M-TPPL, 5108M-TP) Incoming signal to TP port...

  • Page 25: Fiber Backbone, Twisted Pair To-The-Desk

    There is an equivalent fiber distance for the 3Com Ethernet fiber modules (see Rule 4). The equivalent is:...

  • Page 26: Sample Configuration Distance Calculation

    ESIGNING AND XPANDING THE ETWORK Fiber Backbone, Twisted In the sample configuration shown in Figure 2-1, we determine if the transceivers are within legal Ethernet distance limits. Note that Pair To-The-Desk 24-gauge unshielded twisted-pair cable is used to connect 10BASE-T transceivers to the 24-Port modules in the hubs.
  • Page 27 Fiber Backbone, Twisted Pair To-The-Desk 3 Subtract the total equivalent distance of each hub located between transceivers A and B [inclusive (965 m)] from the maximum network diameter (4200 m). In this case, your subtotal is 3235 m. 4 Determine the total amount of cable between transceivers A and B (1675 m) and subtract this number from the subtotal determined in Step 3 (3235 m).

  • Page 28: Twisted Pair Backbone, Twisted Pair To-The-Desk

    ESIGNING AND XPANDING THE ETWORK Twisted Pair In constructing a twisted pair backbone, remember the following rule: Backbone, Twisted There can be no more than eight 24-Port modules in the path Pair To-The-Desk between any two transceivers due to Ethernet's four-repeater rule. This is because each 24-Port module counts as a 1/2 repeater unless the signal goes in one port and out another port of the same module, in which case the module counts as a full repeater.

  • Page 29: Module Workgroups

    (isolated networks) per module. Since a managed CoreBuilder 5000 hub may contain as many as 16 CoreBuilder 5000 24-Port Modules, it is possible to configure your hub with a maximum of 96 workgroups.

  • Page 30: Configuring Workgroups

    2-10 ESIGNING AND XPANDING THE ETWORK Configuring One of the primary advantages of dividing your network layout into Workgroups smaller isolated networks is the potential increase of network workgroups. Workgroups enable administrators to have more flexibility in organizing their network, while simultaneously decreasing the amount of traffic on the backplane segments of the hubs in which the workgroups reside.

  • Page 31: Network Reorganization

    Module Workgroups 2-11 After studying each department’s needs, Smith decides to: create separate workgroups for each department within the two organizations connect the workgroups to each other through an internal bridge Table 2-3 provides an in-depth examination of the reorganization of each department.

  • Page 32: Workgroup Port Allocation

    2-12 ESIGNING AND XPANDING THE ETWORK Hub C Slot 4 Slot 8 Slot 1 Slot 3 Slot 6 WG = Module Workgroup Network (where x is the workgroup number) BR = Internal Bridge = Port allocated to internal bridge = Workgroup Figure 2-4 Workgroup Port Allocation To enable all of the workgroups to communicate with each other,...

  • Page 33: Patch Panels

    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 manual. However, each additional patch panel in the link reduces the 100 meter link distance by approximately 10 meters.

  • Page 34: Redundant Links

    50 meters away. Redundant Links You can implement twisted-pair link redundancy between CoreBuilder 5000 hubs using network management. Figure 2-5 shows two examples of a redundant configuration. It is also possible to enable redundancy between ONline modules in a CoreBuilder 5000 hub.
  • Page 35 Redundant Links 2-15 To set link redundancy between two 24-Port modules, connect two links to two ports on the 50-pin cables between the modules. You need to use a crossover adapter between each link because the links are designed to be connected to a LAN card in an end node, not to other module ports.

  • Page 36: Where To Go From Here

    2-16 ESIGNING AND XPANDING THE ETWORK Where To Go From Once you complete this chapter, proceed to Chapter 3. Chapter 3, Here Installing and Operating the Module, describes installation procedures and explains how to set the DIP switches, configure the module through network management, and monitor the front panel using the LEDs.

  • Page 37: Installing And Operating The Module

    (17-00368). This card lists the DIP switch settings, 24-Port module management commands, LED indicators and other module information. Please store this card in the CoreBuilder 5000 hub reference binder in the Reference Card area. The remainder of this chapter describes:...

  • Page 38: Precautionary Procedures

    NSTALLING AND PERATING THE ODULE Precautionary Electrostatic discharge (ESD) can damage static-sensitive devices on Procedures 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.

  • Page 39: Quick Installation

    Verify LED status for normal operation. LED and Network Verification † Refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide for more details on hub power requirements. For information about potential problems, consult the troubleshooting techniques in...

  • Page 40: Module Overview

    CoreBuilder 5000 Ethernet Network Monitor Card to the module. This card enables users to gather network statistics for any of the CoreBuilder 5000 backplane segments. Once attached to the 24-Port module, you must assign the monitor card to the network on which you will gather statistics.

  • Page 41: 24-Port Module And Dip Switch Location

    DIP switch settings when using a management module, issue the SET DEVICE DIP_CONFIGURATION command from the management module. If you do not have a CoreBuilder 5000 Distributed Management Module installed in your hub, your hub’s configuration defaults to the dip switch settings on the module.

  • Page 42: Channel Select Dip Switch Settings

    NSTALLING AND PERATING THE ODULE The DIP switch legend on the module refers to the backplane connection as the "channel" selection (CH SEL). The "channel" setting and the "network" setting are the same. Ports set to the same network will communicate with each other. Table 3-2, the switches are labeled 1 through 8.

  • Page 43: Installing The Module

    Installing the Module Installing the You do not need to power off the CoreBuilder 5000 hub to install or Module remove the 24-Port module. You can insert the module while the hub is operating (this is called a hot swap). Follow the steps below to install the 24-Port module.

  • Page 44: Installing A 24-Port Module

    NSTALLING AND PERATING THE ODULE Figure 3-2 Installing a 24-Port Module...

  • Page 45: Open And Closed Module Ejectors

    Installing the Module 6 Close the 24-Port module ejectors as shown in Figure 3-3. Closed Open ejector ejector Figure 3-3 Open and Closed Module Ejectors 7 Fasten the spring-loaded screws on the front of the 24-Port module faceplate to the hub using your fingers (do not overtighten). 8 Attach 180°...

  • Page 46: 24-Port Module Cable Connection

    3-10 NSTALLING AND PERATING THE ODULE 9 Secure the cables to the module connectors as shown in Figure 3-4. 180 50-pin cable connectors 50-pin connector Figure 3-4 24-Port Module Cable Connection 10 Attach the other ends of the cables to a 10BASE-T transceiver, patch panel, or a 10BASE-T adapter card.

  • Page 47: Using 90° Cable Connectors

    Installing the Module 3-11 Using 90° Cable 3Com recommends that you use 180 connectors with this module. If, Connectors however, you currently use 90 cable connectors, use the following procedure to fasten the tie-wraps to your connector. Perform this procedure prior to installing the module into the CoreBuilder 5000 hub.

  • Page 48: Attaching Cables With 90° Connectors

    3-12 NSTALLING AND PERATING THE ODULE 50-pin connector Standoff 50-pin cable connector Figure 3-6 Attaching Cables with 90° Connectors 5 Wrap the tie-wrap connector strap around the 50-pin cable connector to secure the cable connector to the module connector. 6 Attach the other ends of the cables to a 10BASE-T transceiver, patch panel, or a 10BASE-T adapter card.

  • Page 49: Configuring The Module

    The CoreBuilder 5000 Distributed Management Modules provide Module network management for the CoreBuilder 5000 hub and its modules. If you are using a Distributed Management Module, the dip switch settings on the 24-Port module are ignored. For this reason, use network management commands, rather than the dip switches, to configure the module.

  • Page 50: Port Redundancy

    3-14 NSTALLING AND PERATING THE ODULE 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. Use the following network management command to set redundancy between ports: SET PORT { slot.port } MODE {redundant} { slot.port } {non-redundant}...

  • Page 51: Auto Polarity

    (collectively) on the module to network 1 through 8 or to an isolated segment. Network management, however, lets you assign one or more ports to a network. If you have a CoreBuilder 5000 Ethernet Network Monitor Card, network management also enables you to assign the...

  • Page 52: Remote Diagnostics

    (for example, ISOLATED_1). For more information on workgroups, refer to Module Workgroups in Chapter 2. It is not possible to assign the CoreBuilder 5000 Ethernet Network Monitor Card to an isolated segment. Remote Diagnostics The Remote Diagnostics feature allows the 24-Port module to detect...

  • Page 53: Saving The Configuration

    Saving the Configuration 3-17 Saving the After you make configuration changes to a module and ports, you Configuration must issue the SAVE MODULE_PORT command to save the new settings. Failure to save module settings may result in loss of configuration data. Showing Module You can display status information about the 24-Port module using the Configurations...
  • Page 54 3-18 NSTALLING AND PERATING THE ODULE SHOW PORT { slot.port } {verbose} { slot. all} {no_verbose} The following output is an example of the SHOW PORT ALL VERBOSE command issued for a 24-Port module installed in slot 4 (only the output for ports 1, 2, and 3 are shown): CB5000>...

  • Page 55: Gathering Statistics

    Gathering Statistics To monitor ethernet statistics on your 24-Port module, you must attach the CoreBuilder 5000 Ethernet Network Monitor Card to the network you wish to monitor. This card enables you to individually select and monitor each backplane segment of your hub.

  • Page 56: Monitor Command

    3-20 NSTALLING AND PERATING THE ODULE Monitor Command The MONITOR command enables users to monitor each network (individually) by specifying the backplane segment to which your ports are configured. Use the following syntax to implement the command: MONITOR {mm:ss} {ETHERNET} {ethernet_1..._8} {REPEATER} The system-specified range of time allotted for monitoring the network is 00 to 30 (minutes) and 05 to 59 (seconds).

  • Page 57: Show Counter Command

    Received Packets 24000 Received Octets 285000 Transmitted Packets 1200 Transmitted Octets 75000 Transmitted Errors Transmitted Broadcast Packets 150 Transmitted Multicast Packets 280 For more information on repeater, ethernet, and rmon statistics, refer to the CoreBuilder 5000 Distributed Management Module Commands Guide.

  • Page 58: Monitoring The Front Panel

    3-22 NSTALLING AND PERATING THE ODULE Monitoring the The LEDs on the front panel of the 24-Port module allow you to Front Panel monitor the status of each port. The 24-Port module has a pair of Activity and Status LEDs for each port. Figure 3-8 shows the location of the LEDs.

  • Page 59: Led And Network Verification

    For more information on the DMM, refer to the Distributed Management Module User Guide. Using the The CoreBuilder 5000 hub's controller module is equipped with an LED CoreBuilder 5000 Test button on the front panel. The LED Test button is used to verify Controller Module LED operation.

  • Page 60: Using The Dmm To Verify Network Connections

    ODULE Using the DMM to The DMM enables you to verify each network connection – both active and isolated – for all CoreBuilder 5000 modules and monitor cards Verify Network Connections installed in your hub. To initiate the verification process, you must press the Display Control Toggle button on the front of the module.

  • Page 61: Troubleshooting With The Module Status Led

    ROUBLESHOOTING This chapter describes troubleshooting procedures for the ™ CoreBuilder 5000 Ethernet 24-Port Module. Information on troubleshooting will assist you in verifying the module's operation. Typical fault conditions are addressed in this chapter. Troubleshooting Diagnostic features are covered in Table 3-3.

  • Page 62: Troubleshooting With The Status Leds

    ROUBLESHOOTING Troubleshooting A blinking Port Status indicator signals a problem with a port or a link With the Status LEDs connected to a port. Once a port detects a problem, you can further analyze the problem by counting the number of blinks. Table 4-2 provides troubleshooting suggestions for each of the blinking sequences.

  • Page 63: Troubleshooting With The Activity Leds

    Technical You can receive assistance for installing and troubleshooting the 24-Port Assistance module by calling your 3Com rep or 3Com Technical Support. Be prepared to supply the following information: a description of the problem the steps you have taken to try to correct the problem...

  • Page 64: Where To Go From Here

    Where To Go From If you complete this chapter and are still unable to ascertain the cause Here of a particular problem with your 24-Port module, contact 3Com Customer Support and provide them with the specific nature of your problem. Refer to...

  • Page 65: Electrical Specifications

    Electrical Backplane Interface: Two 96-pin edge connectors, compatible with Specifications 3Com's CoreBuilder 5000 hub Power Requirements: 3.5 A for 5V Fuse: 10.0 Amps Fast blow Watts: +5V = 17 Watts; +12V = .102 Watts; -5V = .108 Watts; +2V = .008 Watts...

  • Page 66: Mechanical Specifications

    Configuration rules: supports IEEE 802.3 controllers and IEEE 802.3 repeaters Ethernet interface: Two 50-pin Telco connectors; each supports 12 connections Number of ports: 24 Cabling: per the 10BASE-T Standard Host interface: 3Com CoreBuilder 5000 hub bus interface standard Installation attachment: Two thumbscrews on the faceplate...

  • Page 67: 50-Pin Connector And Cable

    50-Pin Connector and Cable 50-Pin Connector Figure A-1 provides examples of a 50-pin cable (male) connector, and a and Cable 50-pin (female) connector on the 24-Port module. Following Figure Table A-1 which lists the receive and transmit pairs, pinouts, and port assignments for a 50-pin cable.

  • Page 68: 50-Pin Cable Pinouts And Port Assignments

    PECIFICATIONS Table A-1 50-Pin Cable Pinouts and Port Assignments Transceiver Transceiver Function/ Function Port Function/ Function Port # Pin # Polarity /Polarity Pin # Polarity /Polarity Port 1 RX, + TX, + (1) RX, + TX, + (1) Port 1 RX, - TX, - (2) RX, -...

  • Page 69: Twisted Pair Connectors And Cables

    Twisted Pair Connectors and Cables Twisted Pair There are many types of cables and connectors that you can use to link Connectors and your 24-Port module to your network. Use this information in this Cables section to ensure that the cables and connecting hardware meet requirements.

  • Page 70: Connecting Twisted Pair Cables

    Connecting Twisted Pair Cables We recommend that you connect cables first at the active hub location, and connect transceivers second. Refer to the CoreBuilder 5000 Integrated System Hub Installation and Operation Guide for more information about the CoreBuilder 5000 hub connections.

  • Page 71: B Technical Support

    3Com provides access to technical support information through a variety of services. This appendix describes these services. Information contained in this appendix is correct at time of publication. For the very latest, access 3Com Corporation’s World Wide Web site as described below. This appendix describes:...

  • Page 72: World Wide Web Site

    ECHNICAL UPPORT World Wide Web Site Access the latest networking information on 3Com Corporation’s 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, 3Com Corporation’s latest news releases, NetAge Magazine, and more.

  • Page 73: 3Comfacts Automated Fax Service

    , provides data Automated Fax sheets, technical articles, diagrams, and troubleshooting instructions on Service 3Com products 24 hours a day, 7 days a week. Call 3ComFacts using your Touch-Tone telephone using one of these international access numbers: Country Telephone Number...

  • Page 74: Support From Your Network Supplier

    Support From Your If additional assistance is required, contact your network supplier. Network Supplier Several 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.

  • Page 75: Support From 3Com Corporation

    If you are unable to receive support from your network supplier, 3Com Corporation technical support contracts are available from 3Com. Contact your local 3Com sales office to locate your authorized service provider using one of the following numbers: Regional Sales Office...

  • Page 76: Returning Products For Repair

    ECHNICAL UPPORT Returning Products Before you send a product directly to 3Com for repair, you must first for Repair obtain a Return Materials Authorization (RMA) number. Products sent to 3Com without RMA numbers are returned to the sender unopened, at the sender’s expense.

  • Page 77: Contacting 3Com Technical Publications

    Contacting 3Com Technical Publications Contacting 3Com If you have comments or questions on 3Com Technical Publications Technical documents, contact the Technical Publications group by fax at Publications (508) 229-1551. 02/06/97...
  • Page 79 Theory of Operation CoreBuilder 5000 Hub Unpacking Procedures Hot Swap Capabilities 24-Port Module LEDs 3-23 Crossover Mode Interpreting 3Com Bulletin Board Service (3ComBBS) 3Com sales offices 3Com URL 3ComFacts Designing Your Network 3ComForum Dip Switch Settings 50-Pin Cable 3-14, 3-19...
  • Page 80 3-14 Description returning products for repair logical network RJ-45 Connector Pinouts 3-17 Mechanical Specifications Showing Module Configurations MIBs Simple Network Management Protocol (SNMP) 3Com commands Module Configurations SNMP. See Simple Network Management Protocol Saving 3-17 Specifications 3-17 Showing Star Topology...
  • Page 81 NDEX technical support 3Com URL bulletin board service fax service network suppliers product repair using CompuServe Troubleshooting Port Activity LEDs Port Status LEDs With Activity LEDs With Port Status LEDs Twisted Pair Cables Connections Connectors Twisted Pair Cables Connecting Twisted Pair Configuration...
  • Page 83 For purposes of this warranty, the CoreBuilder 5000 Ethernet 24-Port 10BASE-T Module is considered an Internetworking product. ARDWARE 3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of purchase from 3Com or its Authorized Reseller: Internetworking products...
  • Page 84 IMITATION OF IABILITY TO THE FULL EXTENT ALLOWED BY LAW, 3COM ALSO EXCLUDES FOR ITSELF AND ITS SUPPLIERS ANY LIABILITY, WHETHER BASED IN CONTRACT OR TORT (INCLUDING NEGLIGENCE), FOR INCIDENTAL, CONSEQUENTIAL, INDIRECT, SPECIAL, OR PUNITIVE DAMAGES OF ANY KIND, OR FOR LOSS OF REVENUE...

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