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Nortel Networks 5625HD Using Category 5 Unshielded Twisted Pair Cables

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Cables and Connectors

206208-A B-5

Pin 1 crosses to pin 3, and pin 2 crosses to pin 6. To build this cable, you must

cross pairs. The pairs are listed in TableB-2, with an example of the color

combinations found in two typical cables.

Using Category 5 Unshielded Twisted Pair Cables

Unshielded twisted pair (UTP) cable is the recommended wiring option for

100BASE-TX Fast Ethernet, as specified in the IEEE 802.3 standard for Ethernet.

FastEthernet recommended UTP cable consists of four pairs of twisted insulated

copper conductors bound in a single plastic sheath. The 100BASE-TX Fast

Ethernet transmissions are implemented through two-pair or four-pair Categor y 5

UTP wiring using standard shielded RJ-45 connectors. Category 5 cable is

certified to handle up to 100 MHz bandwidth. The EIA/TIA T568A standard

recommends the installation of Category 5 UTP cable for 100 Mb/s networks.

Use the following guidelines to ensure that your cables perform to specifications:

• Certification—Make sure that your Category 5 UTP cable has completed the

Underwriters Laboratories (UL) or Electronic Testing Laboratories (ETL)

certification process.

• Terminating method—To minimize cross ta lk noise, maintain t he twist r atio of

the cable up to the point of termination (untwist at any termination should not

exceed 0.5 in.).

• Pairing options—For optimal performance from your cable plant, use the

EIA-T568A Commercial Building Wiring Standard pairing opti on a t eac h end

of the cable. The terminating hardware offered by most major manufacturers

is correctly color-coded for proper wire placement according to that standard.

TableB-2. Pairs in an RJ-45 Crossover Cable

Pairs Example 1

Color Combinations Example 2

Color Combinations

1 and 2 Orange/white and white/orange Orange and blue

3 and 6 Green/white and white/green Yellow and black

4 and 5 Blue/white and white/blue Red and green

7 and 8 Brown/white and white/brown Brown and gray

Contents

Main ii Copyright 1999 Nortel Networks Trademarks Statement of Conditions USA Requirements Only European Requirements Only Japan/Nippon Requirements Only Taiwan Requirements Canada Requirements Only Nortel Networks Software License Agreement iv Page Page Contents Page Page Page Figures Page Page Page Preface Before You Begin Related Publications Page How to Get Help Chapter 1 Overview of the Model 5625HD Switch Module Overview of the EtherSpeedII Switch Module Page Features of the Model 5625HD Switch Module Page Overview of the Model 5625HD Switch Module 206208-A 1-5 Physical Description Figure 1-2. Model 5625HD EtherSpeedII 24-Port Autonegotiating Switch Module Switch Configuration and Management Spanning Tree Protocol 802.1d Support Support for Virtual LANs Filtering Hot-Swapping Capability About the Model 500xBH/BHC Backplane 1-10 LEDs Port LEDs Figure 1-5. LEDs on the Model 5625HD Switch Module 10/100 Mb/s UTP Autonegotiation Ports 5625HD Page Connecting to Ethernet Hubs and Network Devices Network Configuration Examples 2-4 Figure 2-1. Network Example Giving a Server a Dedicated Port 2-6 Replacing a Bridge Figure 2-3. Replacing a Bridge Desktop Switch with ATM Uplinks 2-8 Figure 2-4. Desktop Switch with ATM Uplinks Segment Switch in an Enterprise Network Desktop Switch and Frame-to-Cell Converter Multi-Link Trunking Default Port Configuration Predefined SpeedView Configurations Chapter 3 Installing the Model 5625HD Switch Module Arranging Modules in a Model 500xBH/BHC Chassis Page Page Required Tools and Equipment Installing the Switch Module Page Checking LEDs Making 10/100 Mb/s Connections Connecting Terminals and Management Stations Page Checking the Module Connection to the Backplane Removing and Replacing the Switch Module Conditions for Replacing a Switch Module Removing a Switch Module Installing the Replacement Switch Module Reconfiguring the Replacement Switch Module Page Chapter 4 Troubleshooting Preliminary Steps Previous Module Configuration Incompatibility Model 5625HD Switch Module Startup Failure Port Connection Problems Page Page Appendix A Technical Specifications Using the Model 5625HD EtherSpeed Switch Module A-2 Technical Specifications Page Appendix B Cables and Connectors UTP Cable Length Limitations UTP Cabling 10BASE-T/100BASE-TX MDI Ports and MDI-X Ports Page B-4 UTP Cables and Connectors Figure B-3. 10BASE-T/100BASE-TX Ethernet UTP Crossover Cable TableB-1. 10BASE-T/100BASE-TX MDI-X Port Pin Assignments Using Category 5 Unshielded Twisted Pair Cables Using Shielded Twisted Pair Cables 206208-A C-1 Port LEDs Appendix C LEDs Figure C-1. LED Display for the Model 5625HD Switch Module 5625HD 10/100 Switch Host Port Status C-2 TableC-1. LEDs on the Model 5625HD Switch Module RJ-45 LEDs Page Index Numbers A B C D E F H I R S T U V