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3Com 5124M-TPCL Switch User Manual

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1. Module Indicators Z Port 1 E 34 5678 910 Port 2 502055100 ar 29 50 Pin Connector H L 1234 5678 910 n 2 e ea l CONN 1 2 O c zzo zzun 50 Pin opatu ud Connector e NOE 00r 925 II 5 5 dor OOF e z e e mm Backplane DIN Figure 3 1 Model 5124M TPCL Model 5124 DIP Switch Location 3 6 ONline Ethernet 24 Port 10BASE T M odule Installation Guide 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 Installing and Operating the Module 3 7 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 M odule later in this chapter Table 3 2 DIP Switch Settings
2. 50 Pin Cable ojo S S S S ojo S S 50 Pin Cable 1 4 Crossover Adapter Figure 2 5 Redundant Twisted Pair Configuration Using 24 Port Modules To set link redundancy between two 24 Port M odules refer to Figure 2 5 1 Connect one port on the 24 Port M odule installed in the concentrator on the left to a corresponding port on the 24 Port M odule installed in the concentrator on the right 2 Connect the second port on the 24 Port M odule installed in the concentrator on the left to a corresponding port on the 24 Port M odule 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 2 16 ONIine Ethernet 24 Port 10BASE T M odule Installation Guide 3 Usethe 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 Q Link failure Port partition The sw
3. Tie Wrap Figure 3 6 Attaching Cables With 90 Connectors 3 16 ONIine Ethernet 24 Port 10 Module Installation Guide 6 Attach the other ends of the cables to any of the following A 10BASE T transceiver patch panel 10 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 odel Number 5124 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 Q Before Configuring the Module Enabling Ports Enabling Port Redundancy Enabling Link Integrity D D D O Selecting a Network Installing and Operating the Module 3 17 Q Enabling Remote Diagnostics M ode Q Setting the Autopartition Threshold Value For additional information on any network management command described in this section refer to the appropriate ON
4. DIP Factory DIP Switch Setting Switch Label Function Default Off On 1 CH SELO Select See Table 3 3 2 CHSEL1 Connector 1 Network 3 PORT EN Enable DisableC Enable Disable Enable onnector 1 Ports 4 LI EN Enable Disable Enable Disable Enable Connector 1 Link Integrity 5 CH SELO Select See Table 3 3 6 CH SEL 1 Connector 2 Network 7 PORT EN Enable Disable Enable Disable Enable Connector 2 Ports 8 LI EN Enable Disable Enable Disable Enable Connector 2 Link Integrity 9 ISO SEP Isolate One Both One One Both Connectors 10 Not None Used 3 8 ONline Ethernet 24 Port 1OBASE T M odule Installation Guide 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 Switch Settings DIP Switch DIP Switch Setting CONN 1 Setting CONN 2 Switch 1 Switch 2 Switch 5 Switch 6 Network Selection On On On On 1 default Off Off 2 On Off On Off 3 Off Off Off Off Isolated connector operates independent of the three backplane networks Installing and Operating the Module 3 9 Installing the M odule You do not need to power down the ONline System Concentrator to install the 24 Port Module You can
5. 14 Theory of Operation i sace ba Sona e b aa nas ER et d 14 Chapter 2 Designing and Expanding the Network Understanding the General Rules 22 Rules for Configuring a Network 2 2 LAN 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 5 2 10 Fiber Backbone 10BASE T To TheDesk 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 ONline Ethernet 24 Port 10BASE T M odule Installation Guide v Setting Backbone Redundancy 2 15 Redundant Twisted Pair Backbone 2 16 Chapter 3 Installing and Operating the Module Precautionary Procedures 3 2 Quick Aole E E EN N ne EAT 3 2 Unpacking Procedures Ca dea a a YESS aut
6. 3 12 Attaching the Tie Wrap Bracket to the Module 3 14 Attaching Cables With 90 Connectors Model Number 5124M TPCL 3 15 Attaching Cables With 90 Connectors 3 16 24 Port Module Faceplate and ONline System Concentrator Model Number 5124M TPCL 3 29 24 Port Module Faceplate and ONline System Concentrator Model Number 5124 3 30 24 Port Module RJ 45 Connector Pinouts A 8 50 Pin Male and Female Connectors A 9 ONIine Ethernet 24 Port 10BASE T M odule Installation Guide ix x ONIine Ethernet 24 Port 10BASE T M odule Installation Guide Tables Table 2 1 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 4 Table A 5 Table A 6 Table A 7 Seven Basic Network Rules 2 3 LAN Product Equivalent Distances 2 6 Procedures for Completing Installation 32 DIP Switch lt 5 3 8 Channel Network Select DIP Switch Settings 3 9 24 Port Module LED Interpretations 331 Network Check Codes 3 33 Troubleshooting Using the Port Status LEDs 4 2 Troubleshooting Using the Port Activity LEDs 44 24 Port Module General 5 2 24 Po
7. spp Remaining Unshielded Twisted Pair Distance 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 Designing and Expanding the Network 2 11 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 1OBASE T Backbone 10BASE T To The Desk In constructing a twisted pair backbone Q 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 the module counts as a full repeater Q Add a bridge if you have more than eight 10 modules serially connected Each bridge creates a subnetwork Each subnetwork can
8. 2 World Wide Web 5 2 Support from Your Network Supplier 2 Support troma Com ee iy Ma ob avg kh eas B 3 Returning Products for Repair B4 Accessing the3Com MIB B4 3Com Technical lt B 5 ONline Ethernet 24 Port 10 M odule Installation Guide vii viii ONline Ethernet 24 Port 10BASE T M odule Installation Guide Figures Figure 1 1 Figure 2 1 Figure 2 2 Figure 2 3 Figure 24 Figure 2 5 Figure 3 1 Figure 3 2 Figure 3 3 Figure 34 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 Figure A 1 Figure A 2 Typical 24 Port Module Configuration 15 Star Wiring Configuration 2 8 Serial Configuration 2 9 Sample Configuration Distance Calculation Using 24Port Modules 2 11 Unshielded Twisted Pair Network Using 24 Port Modules 2 13 Redundant Twisted Pair Configuration Using 24 Port Modules mu rue Gor obs hsc Eat ers 2 16 Model 5124M TPCL and Model 5124M TP DIP Switch ihr um kasqa Watuq Patriae osa 3 6 Installing a 24 Port M odule M odel Number 5124M TPCL 3 11 24 Port Module Cable Connection Model Number 5124M TPCL
9. Patch Panel Hydra Cable or Punchdown Block Tm uui Sec ooo on oon noon amp Figure A 2 50 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 Table A 7 50 Pin Cable Pinouts and Port Assignments ju ign iu Mee Polarity Polarity Polarity Polarity Port1 26 RX TX 1 Port7 38 RX TX 1 Port 1 1 RX TX 2 Pot7 13 RX TX 2 Pot1 27 TX RX 3 Port7 39 TX RX 3 Port 1 2 TX RX 6 Port7 14 TX RX 6 Port2 28 RX 1 Portt8 40 RX TX 1 Port 2 3 RX TX 2 Port8 15 RX TX 2 Port2 29 TX 3 Port8 41 TX RX 3 Port 2 4 TX RX 6 Port8 16 TX RX 6 Port3 30 RX 1 Portt9 42 1 Port 3 5 RX 2 Port9 17 RX TX 2 Port3 31 TX 3 Port9 43 TX RX 3 Port 3 6 TX RX 6 Port9 18 TX RX 6 Port4 32 RX TX 1 Port 44 RX TX 1 10 Port 4 7 RX TX 2 Port 19 RX TX 2 10 Port4 33 TX
10. A 24 Port Module port is faulty Connect the cable to a different port The module connection to the backplane is bad Re insert the 24 Port 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 4 4 ONline Ethernet 24 Port 10BASE T M odule Installation Guide Specifications This appendix lists specifications for the ONline Ethernet 24 Port M odule Model Numbers 5124M and 5124M This appendix contains the following sections Q General Specifications Power Specifications Environmental Specifications M echanical Specifications D D D L Twisted Pair Cable and Connector Specifications Specifications A 1 General Specifications Table A 1 defines general specifications for the 24 Port Module Table A 1 24 Port Module General Specifications Specification Model Number Value 5124M TP 5124M TPCL Ports Per Module 24 Data Rate 10 Mbps million bits per second Data Modulation Differential Manchester External Connectors Model Number 5124 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
11. 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 M odule 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 Forthe 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 Installing and Operating the Module 3 11 6 If you have installed Model Number 5124M TPCL attach and secure cable connectors to module connectors as shown in Figure 3 3 j E N Of N tj D 180 50 Connectors n c 50 Pin Cable Feo Connectors QD j Figure 3 3 24 Port Module Cable Connection Model Number 5124M TP
12. Cable defective Check cables with cable tester Repair or replace cables 4 2 ONline Ethernet 24 Port 10BASE T Module Installation Guide Table 4 1 Troubleshooting Using the Port Status LEDs Continued LED State Indication Possible Cause Corrective Action 1 Blink Link Failure Link Integrity Make sure that continued continued mismatch both ends of the connection have the same Link Integrity setting 2 Blinks Port Faulty cable Check cable with Partitioned cable tester Repair or replace cable Network Reassign users to overloaded another network to balance the load Off Ports Ports disabled Enable ports Disabled 24 Port Module Check the not powered up Controller Module Power LEDs Broken LED Press the LED test button on the Controller M odule Bad 24 Port Replace module Module Troubleshooting 4 3 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 Off Possible Cause There is no traffic received from the segments normal Corrective Action None 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
13. and Transcend are trademarks of 3Com Corporation CompuServe is a registered trademark of CompuServe Inc 3Com registered trademarks are registered in the United States and may or may not be registered in other countries Other brand and product names may be registered trademarks or trademarks of their respective holders Restricted Rights Use duplication or disclosure by the Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 Printed on recycled paper ONline Ethernet 24 Port 10BASE T Module Installation and Operation Guide iii iv ONline Ethernet 24 Port 10BASE T Module Installation and Operation Guide Contents How to Use This Guide UCONN CO sueta ptt ot sere RA Yap DE xiii Str ct re of This GU doe xeu XR RR RR Ra xiv Document Conventions XV Related Documents tase eso t ier ae ae t e t d c Tiy xvi 3Com Documents xvii Reference Documents xvii Chapter 1 Introduction Ethernet 24 Port 10BASE T Module Description 1 1 Module Features os doen quienes Tet a BAA a ua ac a PQ ed 12 Bank Switching Capability 13 Model Number 5124M TPCL 5 13 Model Number 5124M TP Features
14. button after you add the new search parameters ONline Ethernet 24 Port 1OBASE T Module Installation Guide xv Convention Indicates Example Note A Note The Note Use STP lobe information is cables for your system important Caution A Caution A Caution Do not put condition may your installation damage diskettes on a software or magnetic surface hardware This may damage the diskettes Warning Warning Warning Wear eye condition may protection when threaten performing these personal safety maintenance procedures Related Documents This section provides information on supporting documentation including 3Com Documents Q Reference Documents xvi ONline Ethernet 24 Port 10BASE T M odule Installation Guide 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 ONIine 6 Slot System Concentrator ONline Ethernet Management M odule Installation and Operation Guide Describes how to install the ONline Ethernet Management M odule in the ONline System Concentrator and explains the LEDs on the module faceplate This guide als
15. configuration Figure 2 2 Serial Configuration Designing and Expanding the Network 2 9 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 10 To The Desk Be aware of the following additional rules for configuring a network Q The four repeater rule in Ethernet limits the number of LOBASE 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 Q 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 concen
16. 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 2 12 ONIine Ethernet 24 Port 10BASE T M odule Installation Guide 6 5555 0 6 0 6 idl ld Wad bad bd emper 51015 1616 5 9 0 9 2 0 ES o jololajo ojo 8 Port Twisted 100 m Pair Module 24 Port Module connected to an 8 Port Twisted Pair Module over the backplane 50 i srereyereperere 6 29 0706 ALL 20 ___ 24 Port Module connected to an 8 Port Twisted Pair Module over the backplane 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 20 370 m Total equivalent distance of the 24 Port Modules 4 420m 4 165 2340 m signal externally enters 4 Twisted Pair Modules 4 420 m signal internally enters 4 Twisted Pair M odules from the backplane 4 165 m Note All 3Com 10BASE T modules 8 Port 10BASE T M odule 50 Pin 1OBASE T Module or the 24 Port 10BASE T M odules fall under these same rules Total equivalent distance 370 2340 m 2710 m Because the total equi
17. Netw ork Configuration 1 Blink Connector is configured for network 1 2 Blinks Connector is configured for network 2 3 Blinks Connector is configured for network 3 Off Connector is isolated from backplane networks Installing and Operating the Module 3 33 Troubleshooting This chapter describes fault conditions and troubleshooting procedures for the ONline Ethernet 24 Port M odules Model Numbers 5124M TPCL and 5124M TP This chapter contains the following sections Q Troubleshooting Using the Port Status LEDs Q Troubleshooting Using the Port Activity LEDs Q Technical Assistance Troubleshooting 4 1 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 Q Port Status LEDs Q 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 1 Blink Indication Link Failure Possible Cause Cable not connected Corrective Action Connect cable
18. 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 Q Verify LED operation Q Verify network channel assignment The LED check button Q Causes all LEDs in all modules in the concentrator to light Q Causes each installed module to identify the network to which it is assigned When you press the LED check button the Controller M odule initiates a test of all modules in the concentrator Q 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 Q 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 3 32 ONIine Ethernet 24 Port 10BASE T Module Installation Guide If the module is in isolated mode the Port Status LEDs on that module or connector do not light Q 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
19. RX 3 Port 45 TX RX 3 10 Port 4 8 TX RX 6 Port 20 TX RX 6 10 A 10 ONline Ethernet 24 Port 10BASE T Module Installation Guide Table A 7 50 Pin Cable Pinouts and Port Assignments Continued Hub Transceiver Hub Transceiver Function Function care Function Func tion Polarity Polarity Polarity Polarity Port 5 34 RX TX 1 Port 46 RX TX 1 11 Port 5 9 RX 2 Port 21 RX TX 2 11 Port 5 35 TX RX 3 Port 47 TX RX 3 11 Port 5 10 TX RX 6 Port 22 TX RX 6 11 Port 6 36 RX TX 1 Port 48 RX TX 1 12 Port 6 11 RX 2 Port 23 RX TX 2 12 Port 6 37 TX RX 3 Port 49 TX RX 3 12 Port 6 12 TX 6 Port 24 TX RX 6 12 50 Not Used Not Used 25 Not Used Not Used Specifications A 11 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 A 12 ONline Ethernet 24 Port 10BASE T Module Installation Guide Technical Support 3Com provides easy access to technical support information through a variety of services This appendix describes the following
20. STP and 120 ohm Cabling Systems M aximum 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 A 2 ONline Ethernet 24 Port 10 Module Installation Guide Table A 1 24 Port Module General Specifications Continued Specification ONIine Value ONIine Fault Tolerant Controller M odule M odel Requirements Numbers 5000M RCTL 5000M RCLS A Fault Tolerant Controller M odule is not required if you have a 6 Slot ONline System Concentrator with Integrated Controller M odel 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 2 24 Port Module Power Specifications Power Specifications Values Backplane Interface Two 96 pin edge connectors compatible with the ONIine System Concentrator and ONcore Switching Hub Power Requirements 2 0 5 Power Consumption 10 watts Fuse 4 0 Amps Fast Blow Specifications A 3 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 Ampfor
21. notice ii Features 1 1 Fiber Link Distances 2 5 Fiber Module Configurations 2 10 Front Panel Monitoring 3 29 Front Panel Indicators Activity LEDs 3 29 3 31 Status Indicators 3 29 Status LEDs 3 31 G General Specifications A 5 Installation 180 Connector 3 11 90 Connectors 3 15 Hot Swap Capabilities 3 10 Installing The Module 3 11 Quick Installation Chart 32 Installing the 24 Port Module 3 10 Installing the Module 32 L LAN Product Equivalent Distances 2 6 LED and Network Verification 3 32 Link Integrity Configuring Using Network Management 3 20 Description 3 20 M MIB B4 Module Configurations 2 Index Saving 3 23 Showing 3 23 Network Unshielded Twisted Pair 2 13 Network Check Codes 3 33 Network Selection Per Connector 3 21 network supplier support B 2 ONline Network Management Module 3 19 ONline System Concentrator Hot Swap Capabilities 3 10 on line technical services B 1 P Patch Panels 2 14 Port Redundancy 3 19 Switchover Conditions 2 17 Ports Configuring Using Network M anagement 3 19 R Redundancy 2 17 Redundant Links 2 16 returning products for repair B 4 S Serial Configuration 2 9 Showing Module Configurations 3 23 SNM P Commands B4 Specifications Environmental A 4 Fuses 3 Power A 3 Star Configuration 2 8 Star Topology 2 3 Status LEDs Troubleshooting Using 4 2 T technical support B 1 Troubleshooting Port Activ
22. services a On line Technical Support Support from Your Network Supplier Support from 3Com Returning Products for Repair Accessing the 3Com MIB D D D UD 3Com Technical Publications On line Technical Support 3Com offers worldwide product support through the following on ine systems Q Email Technical Service Q World Wide Web Site Technical Support B 1 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 maintenanc
23. you can connect to equipment that does not conform to the 10BASE T standard 1 2 ONline Ethernet 24 Port 10 M odule Installation Guide Q 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 1OBASE 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 Q Assign all module ports to an Ethernet network or to an isolated network Q 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 Q Ports 1 through 12 Q Ports 13 through 24 Q 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 Q Two 50 pin Telco connectors one connector attached to 12 ports Q Two 25 pair 10BASE T cables or two 124eg hydra cables one cable per 12 ports Introduction 1 3 Model Number 5124M TP Features Model Number 5124 permits you to connect individual 10BASE T compliant ports using 24 RJ 45 connect
24. 5V 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 0 to 50 C 32 to 122 F Storage Temperature 30 to 65 C 22 to 149 F Humidity 5 to 95 non condensing BTUs hour 30 A 4 ONline Ethernet 24 Port 10BASE T M odule Installation Guide Mechanical Specifications Table A 5 lists mechanical specifications for the 24 Port Module Table A 5 24 Port Module Mechanical Specifications Mechanical 5124M TPCL Values 5124M TP Values Specifications Dimensions 2 54 cm W x 27 31 5 08 cm W x 27 31 L x cm L x 21 6 cm H 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 Ib 0 68 kg 1 5 Ib 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 Q Twisted Pair Cable Specifications Twisted Pair Connector Specifications 50 Pin Connector Pinouts 45 Connector Pinouts Connecting Twisted Pa
25. CL 7 Attach the other ends of the cables to any of the following 10BASE T transceiver patch panel A 10 adapter card 3 12 ONline Ethernet 24 Port 10BASE T Module Installation Guide 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 Q Installing the Cable Tie Wrap Kit Q Securing 90 Cables to the M odule Installing the Cable Tie Wrap Kit A cable tie wrap kit is included with the 24 Port M odule 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 Q 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 Installing and Operating the Module 3 13 Tie Wrap Bracket lt r Y Pd 7 ced Figure 3 4 Attaching the Tie W rap Bracket to the Module 3 Insert the tie wrap through the opening on the tie wrap brac
26. Ed 34 Setting the DIP Switches 34 DIP Switch Overview 3 5 DIP Switch Description 3 7 Installing the Module 3 10 Using 90 Cable 5 3 13 Installing the Cable Tie Wrap 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 POTTS u ster m wes ge yu et CATH wala te Vanes 3 19 Enabling Port Redundancy 3 19 Enabling Link Integrity 3 20 Selecting a 3 20 Enabling Remote Diagnostics Mode 321 Setting the Autopartition Threshold Value 3 22 Saving Module Configurations 3 23 Showing Module Configurations 323 Show Mod le susu a ar dp Spe an d a EROR NOE c 324 SIG W POTE Aor s stars af ode Aw bee ae barnes aa 3 25 Gathering Network Statistics 327 Selecting the Per Port Counters Connector 3 28 Monitorin
27. 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 3 20 ONline Ethernet 24 Port 10 Module Installation Guide SET MODULE slot NETWORK ethernet 1 j 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 1OBASE 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 1OBASE T Transceiver Installation Guide for more informati
28. Port Module Faceplate and ONline System Concentrator Model Number 5124M TPCL Installing and Operating the Module 3 29 Figure 3 8 shows the location of the LEDs on Model Number 5124 Ae T ar EN o E o Connector 1 Comectr2 le HH Activity Status Activity Status S OR Ne X e B elelele elelelelelelelele 2 G Connector 1 mH Ports 1 12 mH EN 12 EN Connector 2 EN Ports 13 24 MANN EN EN d Figure 3 8 24 Port Module Faceplate and ONline System Concentrator Model Number 5124 3 30 ONIine Ethernet 24 Port 10BASE T Module Installation Guide Table 3 4 describes the LEDs for M odel Numbers 5124M TPCL and 5124M Table 3 4 24 Port Module LED Interpretations LED Name Color State Indicates Activity Yellow Off No packets are received on the Ports 1 to 12 ports on this connector Ports 13 to E a On Constant activity on this connector Blinking Normal activity on this connector Status Green On Connector enabled and links OK Ports 1 to 12 or Link Integrity disabled Ports 13 t 1 blink Link failure on one or more ports 2 blinks One or more ports partitioned Off Connector disabled Installing and Operating the Module 3 31 Verifying LED and Network Assignments
29. T 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 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 gt show module 3 ENTE Slot Module Version 03 5124M TPCL 001 R Network General Information ETHERNET 2 Port s are down 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 M odule specify the verbose command argument as shown below ONline show module 3 verbose ENTER Slot Module Version Network General Information 03 5124M TPCL 001 ETHERNET 2 Port s are down 5124M TPCL ONline Ethernet 24 PORT 10 Module Auto Partition Threshold 255 COLLISIONS Module Per Port Counters CONNECTOR 1 Network for Connector 01 ETHERNET 2 Network for Connector 02 i ETHERNET 2 Dip Network Setting for Connector 01 E
30. THERNET 1 Dip Network Setting for Connector 02 ISOLATED 1 3 24 ONIine Ethernet 24 Port 10BASE T Module Installation Guide Show Port To display information for a specific port use the following management command SHOW PORT slot port 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 M odule installed in slot 5 ONline gt show port 5 all ENTER Port Display for Module 5124M TPCL Port ode Status Network General Information 05 01 DISABLED OKAY ISOLATED 05 02 ENABLED OKAY ISOLATED 05 03 ENABLED OKAY ISOLATED 05 04 DISABLED OKAY ISOLATED Installing and Operating the Module 3 25 To display detailed information for all ports on the 24 Port M odule 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 P
31. ation Q 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 ONIine System Concentrator Designing and Expanding the Network 2 7 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 configuration provides two major benefits Faults 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 Building 2 Fiber Backbone Figure 2 1 Star Wiring Configuration 2 8 ONline Ethernet 24 Port 1OBASE T M odule Installation Guide Building a Network Serial Configuration 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
32. com mib 7 To exit the FTP session invoke the quit command 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 Numerics 10BASE FB Links Determine M aximum Distance 2 7 10BASE FB Module Fiber Backbone UTP to the Desk 2 10 Port Redundancy 2 15 Serial Configuration 2 9 Star Configuration 2 8 24 Port M odule Activity LEDs 4 4 Features 12 Hot Swap Capability 1 2 Installing 3 10 Port Status LEDs 42 Procedures for Handling 3 2 Theory of Operation 1 4 Unpacking Procedures 3 4 24 Port M odule LEDs Interpreting 3 31 3Com Bulletin Board Service 3ComBBS B 3 50 Pin Cable Pinouts and Port Assignments A 10 50 Pin Connector A 8 A Activity LEDs Troubleshooting With 4 4 Attenuation 2 7 Audience of Manual xiii Index Backbone Cabling 2 7 Serial Wiring 2 9 Star Wiring 2 8 bulletin board service B 3 C Cabling Connectors A 7 Redundant Links 2 16 2 17 Twisted Pair Backbone 2 12 Configuration Rules General 2 3 2 5 Twisted Pair Backbone 2 12 Crossover M ode 13 D DIP Switches Location 3 5 Dip Switches 3 5 Setting 34 Electro Static Discharge Precautionary Procedures 3 2 Ethernet Four Repeater Rule 2 12 Ethernet Distance Limitations 2 2 Index 1 F Fault Tolerant Controller M odule A 3 FCC
33. con ONline Ethernet 24 Port 1OBASE 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 Federal Communications Commission Notice This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case you must correct the interference at your own expense Canadian Emissions Requirements Cet appareil num rique respecte les limites de bruits radio lectriques applicables aux appareils num riques de Classe A prescrites dans la norme sur la mat riel brouilleur Appareils Num riques NM B 003 dict e par le Minist re des Communications This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus as set out in the interference causing equipment standard entitled Digital Apparatus ICES 003 of the Departme
34. e application training and support services B 2 ONline Ethernet 24 Port 10BASE T Module Installation Guide When you contact your network supplier for assistance have the following information ready Q Diagnostic error messages A list of system hardware and software including revision levels Q 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 Telephone Number Country Telephone Number Belgium 0800 71429 Netherlands 06 0227788 Denmark 800 17309 Norway 800 11376 Finland 0800 113153 Spain 900 983125 France 05 917959 Sweden 020 795482 Germany 0130 821502 U K 0800 966197 Ireland 1 800 553117 U S 800 876 3266 Italy 1678 79489 Technical Support B 3 For access to customer service for all 3Com products call 800 876 3266 You can also contact the Integrated Systems Division ISD on the Internet by using the e mail address techsupp chipcom com Returning Products for Repair A product s
35. e products are mentioned by name In most if not all cases these product names are claimed as trademarks by the companies that manufacture the products It is not our intent to claim these names or trademarks as our own Artel Chipcom Ethermodem Galactica ONcore ORnet StarBridge and TriChannel are registered trademarks of 3Com Corporation Chipcom OpenHub G Man LANsentry M ultiProbe ONdemand ONline ONsemble PowerRing SL2000 513000 SL4000 StackJack StackSystem and Switch Central are trademarks of 3Com Corporation ii ONline Ethernet 24 Port 10BASE T M Installation and Operation Guide The Chipcom M ultichannel Architecture Communications System is registered under U S Patent Number 5 301 303 XNS is a trademark of Xerox Corporation DEC DECnet the Digital logo DELNI POLYCENTER VAX VT100 and VT220 are trademarks of Digital Equipment Corporation IBM is a registered trademark of International Business M achines NetView is a trademark of International Business M achines 3ComFacts Ask 3Com CardFacts NetFacts and CardBoard are service marks of 3Com Corporation 3Com LANplex BoundaryRouting LanScanner LinkBuilder NETBuilder NETBuilderll ParallelTasking View Builder EtherDisk Ether Link EtherLink Plus EtherLink Il TokenLink TokenLink Plus and TokenDisk are registered trademarks of 3Com Corporation 3ComLaser Library 3TECH CacheCard FDDILink FM S NetProbe SmartAgent Star Tek
36. ent directly to 3Com for repair must first be assigned a Return Materials Authorization RM A 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 RM A number for Integrated Systems Division products formerly Chipcom use the following numbers Country Telephone Number Fax Number U S and Canada 800 7242447 508 787 3400 Europe 44 1442 275860 No Fax Asia Pacific 508 787 5296 508 787 3400 Accessing the 3Com MIB The 3Com Management Information Base M IB for the Integrated Systems Division describes commands that enable you to manage 3Com SNM P based products The M is available over the Internet on anonymous FTP server Updates to these M IBs are released as new 3Com products are introduced To access Internet versions 1 FTPto ftp chipcom com 151 104 9 65 2 Enterthe login name anonymous B 4 ONline Ethernet 24 Port 10BASE T Module Installation Guide 3 Enter your full Internet e mail address as the password for example 3doe8 company com 4 Changeto the mib or schema directory using the cd pub mibs Or cd pub mibs schemas command 5 To view the 3Com MIB OID or schema entries enter the dir command Q To pause the display press CTRL S Q To continue the display press CTRLQ 6 Copy the M IB OID or schema files to your current directory using the appropriate command for example get chip
37. es and Ethernet network cabling solutions This chapter contains the following sections Q Understanding the General Rules Q Choosing a Network Backbone Cabling Structure 24 Port Module Configurations Using Patch Panels Q 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 Designing and Expanding the Network 2 1 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 Q Determining maximum 24 Port M odule fiber link distances Q Connecting various horizontal media types 10 twisted pair to a 10BASE FB backbone Q Examples of recommended fault tolerant configurations This section describes Q Rules for Configuring a Network Q Calculating Equivalent Fiber Distances Rules for Configuring a Network This section outlines seven basic network rules and 3Com recommendations for building an Ethernet network 2 2 ONline Ethernet 24 Port 1OBASE T M odule Installation Guide For more hardware specific information on the 24 P
38. g the Front Panel 3 29 Verifying LED and Network Assignments 3 32 Using the LED Check Button 3 32 vi ONline Ethernet 24 Port 10 M odule Installation Guide 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 44 Technical Assistance 44 Appendix A Specifications General Specifications A 2 Power Specifications A 3 Environmental Specifications 4 Mechanical 5 lt 5 Twisted Pair Cable and Connector Specifications 5 Twisted Pair Cable Specifications A 6 Twisted Pair Connector Specifications A 7 RJ 45 Connector 5 A 7 50 Pin Connector Pinouts A 8 Connecting Twisted Pair Cables A 12 Appendix B Technical Support Index Ondine Technical 1 Email Technical Support
39. he 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 Enabling Link Integrity Use the following guidelines to determine whether to enable or disable Link Integrity Q Enable Link Integrity for all ports on the 24 Port M odule for networks that comply with the LOBASE 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 M odule 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
40. iate connectors and cabling 6 If you have a management module Chapter 3 installed in the concentrator configure Configuring the the module using the management Module section commands 7 Verify LED status for normal Chapter 3 Verifying operation LED and Network Note To correct problems consult Assignments section the troubleshooting techniques in Chapter 4 Installing and Operating the Module 3 3 Unpacking Procedures When unpacking your 24 Port M odule l Verify that the 24 Port Module is the model you ordered by checking the model number listed on the side of the shipping carton M odel Number 5124M TPCL or Model Number 5124 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 System Concentrator Installation and Operat
41. ifications 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 amp 2 and pins 3 amp 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 115 pins 4 and 5 not used Q Pair 2 is pins 3 and 6 Pair3 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 M odule Model Number 5124M This model uses M DI X crossed over wiring and only uses Q Pins 1 and 2 station transmit 5124M TP receive Q Pins 3 and 6 station receive 5124M TP transmit Specifications A 7 W G G W O BL W BL O W BR BR RJ 45 Transceiver Connector Pinouts 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 M odule A 8 ONline Ethernet 24 Port 10BASE T Module Installation Guide 50 Pin Module 50 Pin Cable Connector Connector Female Male RJ 45 Connector to Desktop or Transceiver 50 25 25 50 W G G W O BL W BLO W BRBR 1 3 4 5 6 7 8
42. 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 anetwork management module is installed in your concentrator Jf your management module is not EMM Version v4 3 later for Model Number 5124 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 M odule section 2 ForModel 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 5124 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 3 10 ONIine Ethernet 24 Port 10BASE T M odule Installation Guide
43. ion Guide Appendix B Slot Usage Chart Setting the DIP Switches This section describes DIP Switch Overview DIP Switch Description 3 4 ONline Ethernet 24 Port 1OBASE T M odule Installation Guide DIP Switch Overview The 24 Port Module has a single switch located on the module This switch contains 10 DIP switches that let you Q 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 netw ork M 5124M TP Q Enable or disable all ports on each connector Q Establish Link Integrity for each connector or group of 12 ports Q 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 AllDIP switch settings on the 24 Port Module are ignored if an ONline management module EMM Version v3 2 or later for Model Number 5124M EMM Version v4 3 or later for Model Numbner 5124M 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 Installing and Operating the Module 3 5 Figure 3 1 shows the location of the DIP switch component on the 24 Port
44. ir Cables Specifications A 5 Twisted Pair Cable Specifications The cables that are supported must meet the following specifications 22 24 or 26 gauge twisted pair cable 80to 150 ohm impedance Q 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 6 IBM Twisted Pair Cable Specifications No of See Nominal IBM Type Pairs AWG Shielding Impedance 1 2 22 solid Data pairs individually 150 ohms non plenum bare foil shielded plus 6596 copper tinned copper braid 2 6 22 solid Data pairs individually Data 150 non plenum data 2 bare foil shielded plus 65 ohms voice 4 copper tinned copper braid Voice 105 Voice pairs ohms non shielded 6 2 26 7x34 Overall foil shielded 150 ohms non plenum bare pairs plus 6596 tinned copper copper braid 9 plenum 2 26 7x34 Individually foil 150 ohms bare shielded plus 6596 copper tinned copper braid A 6 ONline Ethernet 24 Port 10BASE T M odule Installation Guide 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 Spec
45. itchover 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 Designing and Expanding the Network 2 17 Installing and Operating the Module This chapter describes installation procedures for the ONline Ethernet 24 Port 10BASE T M odules M odel Number 5124M and Model Number 5124M TP This chapter contains the following sections Q Precautionary Procedures Quick Installation Unpacking Procedures Setting the DIP Switches Installing the Module Configuration in a Managed Environment D D D D D DO Saving Module Configurations Showing Module Configurations Gathering Network Statistics Monitoring the Front Panel D D L Verifying LED and Network Assignments Installing and Operating the Module 3 1 Precautionary Procedures Electrostatic discharge ESD can damage static sensitive devices on circuit boards Follow these precautions when you handle the 24 Port Module Handle the board by the faceplate only Module These techniques include Do not remove the board from its antistatic shielding bag until you are ready to inspect or install it Q Use proper grounding techniques when you install the 24 Port Using a foot strap and grounded mat or wearing a gro
46. ity 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
47. ket 3 14 ONline Ethernet 24 Port 10BASE T Module Installation Guide Securing 90 Cables to the Module To secure 90 cables to the 24 Port M odule 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 50 Pin Cable 0 Connector _ 50 Pin Cable Connector 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 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 CIS
48. line Management M odule 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 M odule using the DIP switches as described in the section Setting the DIP Switches For additional information on all network management features refer to Q The appropriate ONline Management M odule Installation and Operation Guide or the ONcore Distributed M anagement M odule User s Guide Q The ONline Management Commands Guide or the ONcore Distributed Management Commands Guide Note The 24 Port Module Model Number 5124 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 5124 module 3 18 ONline Ethernet 24 Port 10BASE T Module Installation Guide 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 M odule When a port is enabled it can transmit to and receive data from t
49. n fact 4200 meters 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 pairis equalto about 1 1 meters of coaxial for one meter of fiber every meter of fiber For simplicity cable assume one meter 2 4 ONline Ethernet 24 Port 1OBASE T M odule Installation Guide 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 you can go up to 4000 meters limits imposed bythe point to point using the or optical power budget 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 usea If you are not certain if you have bridge exceeded allowable network distances use a bridge to extend the network Designing and Expanding the Network 2 5 LAN Equivalence LAN equivalence is the sum of both the incoming and outgoing module port signals Different modules ho
50. nt of Communications VDE Class B Compliance Hiermit wird bescheinigt dass der 5124M TPCL in Uebereinstimmung mit den Bestimmungen der Vfg 243 1991 funkentst ert ist Der Deutschen Bundespost wurde das Inverkehrbringen dieses Geraetes angezeigt und die Berechtigung zur Ueberpr efung der Serie auf Einhaltung der Bestimmungen einger eumt Einhaltung mit betreffenden Bestimmugen kommt darauf an dass geschirmte Ausfuehrungen gebraucht werden Fuer die Beschaffung richtiger Ausfuehrungen ist der Betreiber verantwortlich This is to certify that the 5124M TPCL is shielded against radio interference in accordance with the provisions of Vfg 243 1991 The German Postal Services have been advised that this equipment is being placed on the market and that they have been given the right to inspect the series for compliance with regulations Compliance with applicable regulations depends on the use of shielded cables The user is responsible for procuring the appropriate cables EN55022 CISPR22 Compliance This equipment conforms to the Class A emissions limits for a digital device as defined by EN55022 CISPR22 VCCI Class 1 Compliance cH E HHNNE bed i th c tiara U Ra aca y Wk R Td J T T Z 1 HERAN Eig This equipment is in the 1st Class category information equipment to be used in commercial or industrial a
51. o 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 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 M ay 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 M ay 1990 ONIine Ethernet 24 Port 1OBASE T Module Installation Guide xvii Introduction This chapter introduces you to the 3Com ONline Ethernet 24 Port 10BASE T Modules Model Numbers 5124M TPCL and 5124 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 ONIine System Concentrator and ONcore Switching Hub models This chapter contains the following sections Ethernet 24 Port 10BASE T Module Description Q Theory of Operation Ethernet 24 Port LOBASE T Module Descri
52. on on this feature To enable remote diagnostics mode for a specific port use the following management command SET PORT slot port MODE remote_diagnostics slot port non_remote_diagnostics Installing and Operating the Module 3 21 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 col1j 255 coll You can set the autopartition threshold value to one of the following a a 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 3 22 ONIine Ethernet 24 Port 10BASE T Module Installation Guide 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 M odule using the following network management commands Q SHOW MODULE Q SHOW POR
53. ork 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 3 28 ONline Ethernet 24 Port 10BASE T Module Installation Guide Monitoring the Front Panel 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 M odule has an Activity LED and a Status LED for each connector Figure 3 7 shows the location of the LEDs on Model Number 5124M gt Connector 1 D elelelelele Connector Status Indicators Connector 2 Connector Activity Indicators 50 Connector Figure 3 7 24
54. ors 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 repeaters restore phase and frequency Repeated signals Synchronize to the system clock Enter on the TriChannel amp backplane of the ONline System Concentrator Outgoing signals from the TriChannel backplane are Q Sent directly to transceivers Q Transmitted to twisted pair link segments by the transceivers 1 4 ONline Ethernet 24 Port 1OBASE T M odule Installation Guide Figure 1 1 showsa 24 Port M Number 5124M TPCL connected to nodes by means of bundled 25 pair or 124 hydra cables and patch panels GE Concentrator A A End Nodes A mnmmmmmmmmmmm Patch Panels mmmmmmummmmm Figure 1 1 Typical 24 Port Module Configuration Introduction 1 5 Designing and Expanding the Network This chapter contains configuration information to help you design your network It describes how to configure networks using the ONline System Concentrator Ethernet 24 Port 10BASE T Modules It also provides examples of network cabling structur
55. ort Mode Status Network General Information 17 01 DISABLED OKAY ISOLATED Port Connector TELCO Mode Dip Setting ENABLED Link Integrity ENABLED Link Integrity Dip Setting ENABLED 17 02 DISABLED OKAY ISOLATED Port Connector TELCO Mode Dip Setting ENABLED Link Integrity ENABLED Link Integrity Dip Setting ENABLED 3 26 ONline Ethernet 24 Port 10BASE T Module Installation Guide 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 Q Monitor ports 1 through 12 individually Q 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 Selecting the Per Port Counters Connector When you select a connector netw
56. ort Module refer to Appendix A Table 2 1 Seven Basic Network Rules Rule Definition Recommendations Notes 1 If possible use Use 62 5 micron cable to conform 10BASE FB as the with the IEEE 10BASE F and backbone medium upcoming ANSI FDDI standards Use ST type connectors 2 Wire the backbone in Make sure to lay extra fiber a star topology to cables The extra cost is small and isolate faults 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 The 4200 meters is the maximum Ethernet network diameter is 4200 meters of fiber cable Designing and Expanding the Network 2 3 distance between any two transceivers on the network The 4200 meters does not include the transceiver cable that is drop or patch cable that connects a device with an external transceiver 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 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 known as equivalent distance Every Ethernet network microsecond delay reduces the diameter to less than maximum link distance I
57. ports are automatically enabled Once port redundancy is enabled Q 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 Q Normal Configuration All ports operate as independent cable ports Q 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 M anagement Module Version v3 0 or later Q 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 Designing and Expanding the Network 2 15 Redundant Twisted Pair Backbone You can implement twisted pair link redundancy between System Concentrators using network management Figure 2 5 shows an example of a redundant configuration between concentrators using 24 Port M odules
58. ption This section describes Q Module Features a Model Number 5124M TPCL Features a Model Number 5124M TP Features Introduction 1 1 The ONline Ethernet 24 Port M odule 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 5124 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 10 M odule 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
59. reas and conforms to the standards set by the Voluntary Control Council for Interference by Information Technology Equipment aimed at preventing radio interference in commercial or industrial areas Consequently when the equipment is used in a residential area or in an adjacent area radio interference may be caused to radio and TV receivers and so on Read the instructions for correct handling UK General Approval Statement The ONcore Switching Hub ONline System Concentrator and ONsemble StackSystem Hub are manufactured to the International Safety Standard EN 60950 and are approved in the UK under the General Approval Number NS G 12345 100003 for indirect connection to the public telecommunication network Disclaimer The information in this document is subject to change without notice and should not be construed as a commitment by 3Com Corporation 3Com Corporation assumes no responsibility for any errors that may appear in this document Copyright Statement 9 1996 by 3Com Corporation Printed in U S A All rights reserved 3Com is a registered trademark of 3Com Corporation ONcore is a registered trademark of 3Com Corporation The information contained herein is the exclusive and confidential property of 3Com Corporation No part of this manual may be disclosed or reproduced in whole or in part without permission from 3Com Corporation Trademarks Because of the nature of this material numerous hardware and softwar
60. rt Module Power 5 A 3 24 Port Module Fuse Specifications 4 24 Port Module Environmental Specifications A4 24 Port Module Mechanical Specifications 5 IBM Twisted Pair Cable Specifications A 6 50 Pin Cable Pinouts and Port Assignments A 10 ONline Ethernet 24 Port 10BASE T M odule Installation Guide xi 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 Q Network manager or administrator Q Hardware installer ONline Ethernet 24 Port 10 Module Installation Guide xiii 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 Network Shows possible network configurations using the ONline System Concentrator and the ONIine Ethernet 24 Port Module Chapter 3 Installing and Operating the Module Provides illustrated procedures for installing the 24 Port M odule into the ONline System Concentrator Al
61. so 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 xiv ONline Ethernet 24 Port 10 M odule Installation Guide Document Conventions The following document conventions are used in this manual Convention Courier text Indicates User input Example In the Agent Information Form enter Mrs in the New Contact field System output After pressing the Apply button the system displays the message Transmitting data Bold command Path names Before you begin read the string 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 by the user Type your password and press ENTER Italics Text emphasis document titles Ensure that you press the Apply
62. trator 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 2585 m In addition if a signal makes a roundtrip through a 10BASE T M odule 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 2 10 ONline Ethernet 24 Port 10BASE T M odule Installation Guide 1000 m 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 ConcentratoA li Unshlelded Twisted 1 Maximum A Diameter 100 m 2 Fiber Modules Equivalent 50 140 m Distance 50 140 m BE ET BE D Fiber Backbone Concentrator B 9 o o jo 3 24 Port Modules Equivalent 420 m 165 m Unshielded Twisted Pair Distance B 4 Distances Between Transceivers A amp B 100 1000 m 500 75 Fiber Backbone Concentrator C Sea oo
63. unded static discharge wrist strap Touching the grounded rack or other source of ground just before you handle a 24 Port M odule 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 1 Procedure Verify that your network complies with the basic rules for network design Section Title Chapter 2 Designing and Expanding the Network Unpack the module Chapter 3 Unpacking Procedures section 3 2 ONIine Ethernet 24 Port 10BASE T M odule Installation Guide Table 3 1 Procedures for Completing Installation Step Procedure Section Title 3 If you do not have a management Chapter 3 Setting the module installed in the concentrator DIP Switches section configure the DIP switch settings to your specifications 4 If you have Model Number Chapter 3 Installing 5124M TPCL insert the module into the Module section single open slot in the concentrator and tighten the faceplate screws If you have Model Number 5124 insert the module into two consecutive empty slots in the concentrator and tighten the faceplate screws 5 Establish connections from the 24 Port Chapter 3 Installing Module to devices or to a 10BASE T the M odule section transceiver using the appropr
64. valent distance 2710 m is less than 4200 meters this configuration is legal Designing and Expanding the Network 2 13 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 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 Q 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 patch panel installed between the bottom right PC and the bottom left concentrator would not affect the link because it is only 20 meters aw ay Establishing Fault Tolerant Configurations You can establish fault tolerance for any port on the 24 Port M odule for selected portions of the network backbone or for the entire network backbone This section describes Q Setting Port Redundancy Q Setting Backbone Redundancy 2 14 ONline Ethernet 24 Port 10BASE T M odule Installation Guide Setting Port Redundancy When you enable redundancy between two ports the
65. wever have different equivalent distances Table 2 2 lists the LAN product equivalent distances Table 2 2 LAN Product Equivalent Distances Product pie nes nee ONcore Ethernet 10 Port 10BASE FB Module 190 Incoming signal to fiber port 140 Outgoing signal from fiber port 50 ONcore Ethernet 10BASE T Module 585 Incoming signal to TP port 420 Outgoing signal from TP port 165 ONline Ethernet 10BASE T Modules 585 Incoming signal to TP port 420 Outgoing signal from TP port 165 ONline Ethernet Fiber or 1OBASE FB Modules 190 Incoming signal to fiber port 140 Outgoing signal from fiber port 50 ONline Ethernet FOIRL Module 560 Incoming signal to fiber port 330 Outgoing signal from fiber port 230 ONIine Ethernet Transceiver M odule 0 ORnet Star Coupler 8 or 14 port 26 180 2 6 ONline Ethernet 24 Port 1OBASE T M odule Installation Guide Table 2 2 LAN Product Equivalent Distances Continued LAN product bie nee ONline Ethernet BNC Module 900 Incoming signal to BNC port 450 Outgoing signal from BNC port 450 ONline Ethernet Repeater Module 800 Incoming signal to AUI port 600 Outgoing signal from AUI port 200 IEEE Repeater 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 Q Building a Network Star Configur

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