3Com 5108M-TP Switch User Manual
Contents
1. e World Wide Web Site llle II Support from Your Network Supplier 0 eene Support from 3Com sse es Returning Products for Repair lisse Accessing the 3Com MIB eee ee ees 3Com Technical Publications 4 so8 rer eared ik xS Index vi ONline Ethernet 10BASE T Module User s Guide Figures Figure 1 1 Figure 1 2 Figure 2 1 Figure 2 2 Figure 2 3 Figure 3 1 Figure 3 2 Figure A 1 10BASE T M odule Faceplate and ONline System Concentrator cc auaa ees 1 3 10BASE T Module and Dip Switch Locations 1 5 Sample Configuration Distance Calculation 2 9 Unshielded Twisted Pair Network 2 11 Redundant Twisted Pair Configuration 2 12 Installing a LOBASE T Module 0 0 saan 3 3 10BASE T Module Cable Connection 34 RJ45 Connector Pin outS 0 llle A 4 ONline Ethernet 10BASE T Module User s Guide vii viii ONline Ethernet 10BASE T M odule User s Guide Tables Table 1 1 Table 1 2 Table 1 3 Table 1 4 Table 1 5 Table 1 6 Table 2 1 Table 2 2 Table 2 3 Table 4 1 Table 4 2 Interpretation of the 10BASE T Module LEDs 1 4 Dip Switch SW 1 Settings and Interpretations 1 6 Dip Switch SW 3 Settings for Switches 1 and 4 1 7 Dip Switch SW 3 Settings and Interpretations for SWITCHES Zandi 3r uiii pete tcx re ng Gracey oe Sha ki aCe 1 9 Dip Switch SW 6 Settings and2. 4 4 ONline Ethernet 10BASE T M odule User s Guide Troubleshooting With the Activity LEDs There may be situations where a port s Activity LED maynot light Use the troubleshooting suggestions in Table 4 2 to help isolate why this has occurred Table 4 2 Troubleshooting With the Port Activity LEDs LED LED Name State Activity Off Ports 1 8 Possible Problem There is no traffic received from the segment normal Troubleshooting Solutions None The port is disabled Check the port enable dip switch setting The power is off Check the Controller Module Power LEDs The Activity LED has burnt out Press the LED Channel Check button on the Controller M odule The 10BASE T M odule port is faulty Connect the cable to a different port The module connection to the backplane is bad Reinsert the 10BASE T Module If this fails try another concentrator slot The 10BASE T Module is faulty Try a different LOBASE T Module Troubleshooting 4 5 Technical Assistance You can receive assistance for installing and troubleshooting the 10BA SE T M odule by calling either your 3Com reseller or 3Com Technical Support Be prepared to supply a representative with the following information a a a Description of the problem Steps you have taken to try and correct the problem Type and software version of the ONline network management module being used Ve
3. point to point using the ONcore or optical power budget ONline Fiber Modules If you have poor quality cable or cross many patch panels you may have to sacrifice some distance Some older Ethernet fiber optic products are less powerful than ONcore Fiber M odule optics So when connecting to these products remember that the least powerful device determines the maximum point to point distance 7 When in doubt use a 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 however have different equivalent distances Table 2 2 lists the LAN product equivalent distances Table 2 2 LAN Product Equivalent Distances CAEP gue Si Gotan 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 M odules 585 Incoming signal to TP port 420 Outgoing signal from TP port 165 ONline Ethernet Fiber or 10BASE FB M odules 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 fi
4. 1 2 ONline Ethernet 10BASE T M odule User s Guide 2 e Er ka i a a a e o 2 dD lelelelele slelslalelelela Port 1 toa Sace Per Port Status Indicators 400 5 Do 6 eae roa T 8 oo Per Port Activity Indicators Port 1 i Port 2 hi rots Port 4 t RJ45 Type Connectors Port 5 a Port 6 IT Port7 C s Port 8 E c Figure 1 1 10BASE T Module Faceplate and ONline System Concentrator Introduction 1 3 Table 1 1 Interpretation of the 10BASE T Module LEDs LED Name Color State Indicates Activity yellow Off No packetsare received on Ports 1 8 the segment On Constant activity on the segment Blinking Normal activity on the segment Status green Off Port disabled PO On Port enabled and Link Integrity is functional 1 blink Link Integrity error 2 blinks Jabber error or port Dip Switches partitioning Timed blinks LED is on for 10 seconds blinks off for 400 msecs Link Integrity disabled for this active port The 10BASE T M odule has three dip switches located on the module Q 8 switch dip switch SW 1 O 4 switch dip switch SW 3 Q 8 switch dip switch SW 6 1 4 ONline Ethernet 10BASE T M odule User s Guide Configure the switches to the settings you want if different than the default values Referto Table 1 2 Table 1 3 Tab
5. channel check causes each module s Status LEDs to blink a number of times corresponding to the channel to which it is 1 10 ONline Ethernet 10BASE T Module User s Guide assigned The channel check sequence repeatsfive times Table 1 6 explains the channel check codes Table 1 6 Channel Check Codes LED State Channel Configuration 1 Blink M odule is configured for channel 1 2 Blinks M odule is configured for channel 2 3 Blinks M odule is configured for channel 3 Off Isolated module operates independent of any channel The LED Channel Check button and the Controller M odule are explained in more detail in the ONline Controller M odule Installation Guide The ONline Ethernet Network Management Module The ONline Network Management M odule provides remote network management capabilities for the ONline System Concentrator and its modules The Management M odule can also remotely override the following dip switch settings of the 10BASE T Module Q enable disable each port SET PORT 6 5 MODE ENABLE Q enable disable Link Integrity for each port SET PORT 3 2 LINK_INTEGRITY ENABLE Q set Squelch to high level or low level per port SET PORT 5 1 SQUELCH LOW Q enable disable crossover mode for port 8 SET MODULE 5 CROSSOVER DISABLE Introduction 1 11 o change channel selection per module SET MODULE 4 CHANNEL 2 The ONline Ethernet Management M odule allows you to set redundancy between the ports Refer to Redun
6. command to specify which port isthe primary link and which is the backup link Note If the LOBASE T Modules are powered down and then brought back up without the Ethernet Management M odule present a network loop could occur To prevent a potential failure 3Com advises that you disable the Port Enable dip switch setting for the backup port on one of the 10BASE T M odules Once redundancy is configured a switchover will occur under three conditions a link failure port partition or a jabber condition The switchover occurs when the primary link fails Note that in the unlikely event of a partial break in the link a switchover may not occur In this situation use Network Management to manually switch over the ports Once the switchover occurs and the primary link becomes operational a switch over back to the primary link happens automatically if the cause of the original switchover was a link failure If a jabber condition causes the switchover the link will not automatically switch back to the primary once the problem is resolved In this case use Network Management to manually switch back to the primary link Refer to the ONline Ethernet Network Management M odule Installation and Operation Guide for information on setting redundancy between 10BASE T M odule ports Designing and Expanding the Network 2 13 Patch Panels Patch panels weaken signals thereby reducing achievable link distances 3Com includes the use of on
7. maintenance application training and support services B 2 ONline Ethernet 10BASE T M odule User s Guide When you contact your network supplier for assistance have the following information ready Q Diagnostic error messages Q 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 o U S A and Canada call 800 724 2447 Q Asia Pacific call 508 787 5151 o 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 Norw ay 800 11376 Finland 0800 113153 Spain 900 983125 France 05 917959 Sweden 020 795482 Germany 0130 821502 U K 0800 966197 Ireland 1800 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 sent directl
8. 2760 m Since the total equivalent distance 2760 m isless than 4200 meters this is a legitimate configuration Note that if shielded twisted pair cabling is used each link in the network could run up to 300 meters using Low Squelch refer to Dip Switch SW 3 Crossover M ode Channel Select Squelch in Chapter 1 forinformation on Squelch levels and the Squelch dip switch setting Low Squelch is acceptable for all shielded twisted pair applications since external noise is not a problem Redundant Links You can implement twisted pair link redundancy between ONline System Concentrators using Network Management Figure 2 3 below shows an example of a redundant configuration between concentrators using 10BASE T M odules Crossover SISIS ISIS SOOO Se So Slo oS go oc Adapter Figure 2 3 Redundant Twisted Pair Configuration 2 12 ONline Ethernet 10BASE T Module User s Guide To set redundancy between two 10BASE T M odules connect two links between the modules The redundant link must be connected to a port on the same 10BASE T M odule as the primary link Use a crossover adapter between each link unless you choose to uncross port 8 on one of the modules to make the connection Refer to Chapter 1 for information on using crossover mode Then use the SET PORT lt slot port gt MODE REDUNDANT sslot port5
9. E T M odule You can insert the module while the concentrator is operating called a hot insertion Follow the steps below to install the 10BASE T M odule 3 2 ONline Ethernet 10BASE T Module User s Guide 1 Set the dip switches on the board to the settings you want if different than the default values Refer to Table 1 2 Table 1 3 Table 1 4 and Table 1 5 foran explanation of the dip switch settings 2 Locate a blank slot in the concentrator If there is no blank slot you must remove a blank panel on the concentrator to expose a slot for the 10BASE T Module 3 Insert the module into the board guides at the top and bottom of the slot and slide it into the concentrator M akesure the connector is well seated into the backplane of the concentrator Figure 3 1 shows the installation of the 10BASE T Module Figure 3 1 Installing a 1OBASE T Module Installing and Operating the Module 3 3 4 Fasten thespring loaded screwson the front of the 10BASE T M odule face plate to the concentrator with your fingers do not overtighten 5 Attach the twisted pair cable to the port on the front of the 10BASE T M odule as shown in Figure 3 2 Then attach the other end of the cable to another 10BASE T M odule a 10BASE T Transceiver or a 10BASE T Adapter Card Figure 3 2 shows a cable attached to the 10BASE T M odule nan n 53090 Enn
10. Figure 3 2 10BASE T Module Cable Connection 3 4 ONline Ethernet 10BASE T M odule User s Guide Troubleshooting This chapter describes troubleshooting procedures for the ONline Ethernet 10BASE T M odule Information on troubleshooting will assist you in verifying operation Typical fault conditions are addressed in this chapter Troubleshooting Diagnostic features are covered in Table 1 1 on page 1 4 Table 4 1 and Table 4 2 in this chapter cover fault conditions and troubleshooting suggestions for the 10BASE T Module This chapter is divided into the following parts Q Troubleshooting With the Port Status LEDs Q Troubleshooting With the Activity LEDs Q Technical Assistance Troubleshooting 4 1 Troubleshooting With the Status LEDs A blinking Port Status indicator may be a sign that the port detects a potential problem Once a port detects a problem you can further analyze the problem by counting the number of blinks Table 4 1 provides troubleshooting suggestions for each of the blinking sequences Table 4 1 Troubleshooting With the Port Status LEDs LED State Indication Disabled Possible Troubleshooting Problem Suggestions Off Port Port disabled Enable port 10BASE T Check the Controller Module not Module Power LEDs powered Broken LED Press the LED Channel Check button on the Controller M odule Bad 10BASE T Replace module Module 4 2 ONline Ethernet 10BASE T M odule User s
11. Guide Table 4 1 Troubleshooting With the Port Status LEDs Continued LED State 1 Blink Indication Link Integrity Error Possible Problem Cable not connected Troubleshooting Suggestions Connect cable Cable broken Check cable with cable tester Repair or replace cable Cable too long Try a shorter cable Remote connection has Link Integrity Enable Link Integrity at remote connection or if the remote link doesnot disabled have Link Integrity disable Link Integrity at local connection Weak or no Change Squelch level signal link from high to low low distance too long setting does not conform to the 10BASE T standard Bad port Try another port Device attached to transceiver at other end is not powered on This is not a problem Troubleshooting 4 3 Table 4 1 Troubleshooting With the Port Status LEDs Continued e Possible Troubleshooting LED State Indication Problem Suggestions 2 Blinks Port Faulty cable Check cable with cable Partitioning tester Repair or replace cable Network Reassign users to overloaded another channel to balance the load Jabber Transceiver Try another port or condition attached to the replace module port is jabbering or has DTE jabber Timed Link None This is not a problem Blinks LED Integrity You may want Link isonfor10 Disabled Integrity disabled seconds blinks off for 400 msecs
12. Interpretations 1 10 Channel Check Codes a Na ma dene AA DAN 1 11 Seven Basic Network Rules aa saa 2 3 LAN Product Equivalent Distances 2 6 Maximum Link Distance on Twisted Pair 2 10 Troubleshooting With the Port StatusLEDs 4 2 Troubleshooting With the Port Activity LEDs 4 5 ONline Ethernet 10BASE T M odule User s Guide ix How to Use This Guide The ONline Ethernet 10BASE T Module User s Guide describes the features indicators and installation procedures for the ONline Ethernet 10BASE T M odule Information on troubleshooting and diagnostics is included for verifying operation This guide also contains a configuration section which will be helpful when you plan your network configuration Audience This guide is intended for the following people at your site Q Network manager or administrator Q Hardware installer ONline Ethernet 10BASE T Module User s Guide xi Structure of This Guide This guide contains the following chapters Chapter 1 Introduction Introduces the principal features of the ONline Ethernet 10BASE T M odule and provides viewsand descriptionsof the front panel and the dip switches on the module Chapter 2 Designing and Expanding the Network Shows and explains examples of possible network configurations using the ONline System Concentrator and the ONline Ethernet 10BASE T M odule These examples include both
13. P 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 3Com Bulletin Board Service 3ComBBS B 3 A Audience of Manual xi Backbone Fiber Medium 2 2 bulletin board service B 3 C Cable Types Shielded Twisted Pair 1 1 Unshielded Twisted Pair 1 1 Cabling Connectors A 3 A 4 Fiber Backbone 2 7 2 8 2 10 Redundant Links 2 13 Twisted Pair Backbone 2 11 Twisted Pair Connections 2 10 Wire Types A 4 Configuration Rules Fiber Backbone 2 9 Configuration Rules Fiber Backbone 2 7 2 8 General 2 2 2 3 2 5 Twisted Pair Backbone 2 11 2 12 Index D Dip Switch Settings Channel Select 1 8 1 9 Crossover Mode 1 6 1 7 Link Integrity 1 9 1 10 Port Status 1 5 Squelch Mode 1 7 1 8 Dip Switches 1 4 F FCC notice ii Features 1 1 1 2 Fiber Link Distances 2 5 Front Panel Indicators Activity LEDs 1 2 1 4 Status Indicators 1 2 Status LEDs 1 4 Installation Cabling 3 4 Installing The M odule 3 3 3 4 L LAN Product Equivalent Distances 2 6 Link Distances Configuration Rules 1 1 Index 1 M U MIB B 4 Unshielded Twisted Pair 2 8 2 10 2 11 network supplier support B 2 VDE compliance ii ONline Controller Module 1 10 Wire Types 1 1 ONline Ethernet Managem
14. airings a a a pins 4 and 5 are pair 1 pins 3 and 6 are pair 2 pins 1 and 2 are pair 3 pins 7 and 8 are pair 4 Specifications A 3 Refer to Figure A 1 for an example of this connector and the cable pin outs Pair 2 Pair 3 Pair 1 Pair4 1 2 3 4 5 6 W G G W O BL W BLO W BR BR Jack Positions Figure A 1 RJ45 Connector Pin outs Some installations may have 50 pin Telco connectors at the wiring closet Werecommend using a patch panel that converts from 50 pin to RJ45 type connectors This allows direct connection to the ONline Ethernet 10BASE T M odule in your ONline System Concentrator Twisted Pair Cables The cables that are supported must meet the following qualifications Q 22 24 or 26 gauge twisted pair cable Q 80 to 150 ohm impedance Q minimum of 2 pairs Usually a pair on a twisted pair cable is designated by a solid color wire twisted with a striped wire with the same color A 4 ONIine Ethernet 10BASE T M odule User s Guide Connecting Twisted Pair Cables We recommend that you connect cables first at the active concentrator location and connect transceivers second Refer to the ONline System Concentrator Installation and Operation Guide for more information about the ONline System Concentrator connections Specifications A 5 Technical Support 3Com provides easy access to technical support information through a variety of services This appendix describes th
15. ber port 230 ONline Ethernet Transceiver Module 0 10BASE FB Star Coupler 8 or 14 port 26 180 2 6 ONline Ethernet 10BASE T M odule User s Guide Table 2 2 LAN Product Equivalent Distances Continued LANPiQaug pice AE ONline Ethernet BNC M odule 900 Incoming signal to BNC port 450 Outgoing signal from BNC port 450 ONline Ethernet Repeater M odule 800 Incoming signal to AUI port 600 Outgoing signal from AUI port 200 IEEE Repeater 800 Fiber Backbone Twisted Pair To The Desk When you configure a network with unshielded or shielded twisted pair cabling to the desk and fiber for the backbone there are only three additional rules you need to be aware of Q There can be no more than eight 10BASE T M odules 5108M TP in the path between any two transceivers due to Ethernet s four repeater rule each 10BASE T Module counts as a 1 2 repeater You must add a bridge if you have more than eight 10BASE T M odules serially connected Q There is an equivalent fiber distance for the ONline Fiber Modules see Rule 4 The equivalent is 140 metersforsignalsthat externally enter a Fiber M odule port 50 meters for signals that internally enter a Fiber Module via the ONline Concentrator backplane Designing and Expanding the Network 2 7 o There is an equivalent fiber distance for the 10BASE T M odules see Rule 4 The equivalence is 420 meters for signals that externally enter a LOBASE T M odule po
16. con ONline Ethernet LOBASE T Module User s Guide Document Number 17 00141 3 Printed March 1995 Model Number 5108M 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 O peratio n ofthisequipment in a residential area is likely to cause harmful interference in which case you must correct the interference at your own expense Canadian Emissions Requirements This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe A respecte toutes lesexigences du Reglement sur le mat riel brouilleur du Canada VDE Class B Compliance Hiermit wird bescheinigt dassder 5108M TP 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 d
17. dant Links in Chapter 2 for an example of setting redundancy between concentrators using 10BASE T M odules Refer to the ONline Ethernet Network Management M odule Installation and Operation Guide for additional information on the Network M anagement features 1 12 ONline Ethernet 10BASE T Module User s Guide Designing and Expanding theNetwork This appendix contains configuration information that will help you to design your network Install all equipment using only approved cables for proper operation Refer to Appendix A in the Twisted Pair Connectors and Cables section for information on twisted pair connector and cable requirements This appendix describes how to configure your network with the ONline System Concentrator and the ONline Ethernet 10BASE T M odule It also provides examples of alternative network cabling structures and rules for configuring Ethernet networks There are five sections Network Diameter Calculations General Rules Fiber Backbone Twisted Pair To The Desk Redundant Links o o Q Twisted Pair Backbone Twisted Pair To The Desk o o Patch Panels Designing and Expanding the Network 2 1 Understanding the General Rules As part of your network design it is important to consider your network size For instance is the network end to end 100 meters 1000 meters 4000 meters or more What are your plans for expansion Your answers play a role in how you configure your network For examp
18. e module faceplate This guide also provides instructions for connecting a terminal to the module and describes the management commands necessary to perform management tasks on the concentrator and on remote devices ONline Management Commands Guide Provides an alphabetized reference resource describing all ONline management commands Fora complete list of 3Com documents contact your 3Com representative Reference Documents The following documents supply related background information Case J Fedor M Scoffstall M and J Davin The Simple Network Management Protocol RFC 1157 University of Tennessee at Knoxville Performance Systems International and the MIT Laboratory for Computer Science May 1990 Rose M and K McCloghrie Structure and Identification of Management Information for TCP IP based Internets RFC 1155 Performance Systems International and Hughes LAN Systems May 1990 ONline Ethernet 10BASE T Module User s Guide xv Introduction This chapter describes the features indicators and dip switch settings on the ONline Ethernet 10BASE T M odule The ONline Ethernet 10BASE T Module The ONline Ethernet 10BASE T M odule is an eight port IEEE 802 3 repeater module that complies with the 10BASE T standard This module works with the 3Com ONline System Concentrator using both unshielded and shielded twisted pair wiring The ONline 10BASE T M odule providesthe following features and benefits Q s
19. e setting the Squelch level to low increases the achievable link distance by approximately 25 to 50 but with the added risk of losing packets to impulse noise Do not use Low Squelch mode if your network should experience too many illegally short packets runts This problem will occur if there is significant external noise around the link Setting the Squelch level to low in conjunction with shielded twisted pair wiring increases the achievable link distance without sacrificing noise immunity Thus there is no realdrawback in using Low Squelch on shielded twisted pair To gain the extended link distance achieved by using Low Squelch mode you must use qualified data grade shielded twisted pair cable or qualified high performance unshielded cable IBM Type 1 shielded cable with an appropriate RJ45 to Type 1 connector among others meets this requirement If you are unsure of the grade of twisted pair cable to use set the Squelch level to high or call 3Com for a list of qualified cables to use in extended distance applications Channel Select Switch Settings The ONline Ethernet 10BASE T M odule is equipped with the technology to work with the ONline System Concentrator s unique TriChannel architecture This feature allows you to assign the module to any of three channels or none on the ONline System Concentrator backplane Refer to Chapter 1 in the ONline System Concentrator Installation and Operation Guide for a complete discussi
20. e ee 2 6 Fiber Backbone Twisted Pair To The Desk 2 7 Fiber Backbone Twisted Pair To The Desk Example 2 8 Twisted Pair Backbone Twisted Pair To The Desk 2 11 Redundant LINKS us vie kr ve itera ck IP LA COT SP a aD e 2 12 Patch Panels e rc eae ont Pr ur ae e EP t e ANG 2 14 ONline Ethernet 10BASE T M odule User s Guide v Chapter 3 Installing and Operating the Module Precautionary Procedures 15 4 Sodas dh TRU ea de e TD Unpacking Procedures 4 epp t UR he ERE ROR Ee ES Installation Procedures ssssseee meh Chapter 4 Troubleshooting TOUDIESNOODUNG sd nG Drei Seth E Roa NGA han Cu ea d Troubleshooting With the Status LEDS 00 0000 ee Troubleshooting With the Activity LEDS 00000 eee Technical Assistante ouo m STAG i ha ead Pao e pe i d asad Appendix A Specifications ONline Ethernet 10BASE T Module Specifications Electrical Specifications seen Environmental Specifications eee ee Mechanical Specifications lt us bv hp XR Rn General Specifications 423 xor mo pate e RR REE ange Twisted Pair Connectors and Cables riesige REUERdG ERE en Twisted Pair Connectors isse ees Twisted Pair Cables cc RR II Connecting Twisted Pair Cables Appendix B Technical Support On line Technical Support lssssee RR II II Email Technical Support
21. e following services Q On line Technical Support Support from Your Network Supplier Support from 3Com Returning Products for Repair Accessing the 3Com M IB D D D D UD 3Com Technical Publications On line Technical Support 3Com offers worldwide product support through the following on line 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 W ide 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
22. e patch panel in the 150 meter link distance calculation However each additional patch panel in the link reduces the 150 meter link distance by approximately 10 meters In the example in Figure 2 2 if two patch panels were used between the top right PC and the top right concentrator the link distance of 150 meters would have to be shortened to 140 meters This is because the maximum allow ablelink distanceon 22 gauge wire using 1OBASE T signaling with two intervening patch panels is 150 meters minus approximately 10 meters Note that a patch panel installed betw een the bottom right PC and the bottom left concentrator would not affect the link since it is only 20 meters 2 14 ONline Ethernet 10BASE T Module User s Guide Installing and Operating the Module This chapter describes the precautionary unpacking and installation procedures for the Ethernet 10BASE T M odule Precautionary Procedures Electrostatic discharge ESD can damage static sensitive devices on circuit boards Follow these precautions when you handle the 10BASE T M odule Q Do not remove the board from its anti static shielding bag until you are ready to inspect it Q Handle the board by the faceplate Use proper grounding techniques when you install the LOBASE T M odule These techniques include using a foot strap and grounded mat or wearing a grounded static discharge wrist strap An alternate method is to touch the grounded rack or other source of gr
23. ent M odule 1 11 1 12 on line technical services B 1 p Patch Panels 2 14 R Redundancy 2 13 returning products for repair B 4 S Shielded Twisted Pair 2 10 2 12 SNM P Commands B 4 Star Topology 2 3 T Technical Assistance 4 6 Technical Support 4 6 B 1 Troubleshooting Port Activity LEDs 4 5 Port Status LEDs 4 1 4 3 4 4 Technical Assistance 4 6 Twisted Pair Cables A 4 A 5 Connections A 5 Connectors A 3 A 4 2 Index
24. er 10BASE T standard Thisenablesthe 10BASE T M oduleto beconnected to a 10BASE T Transceiver Port 8 however can be uncrossed using the crossover mode switch to connect the 10BASE T M odule directly to another 10BASE T M odule without the need for an external crossover adapter One port must be crossed over and the other port port 8 must be uncrossed when connecting a 10BASE T M oduleto another 10BASE T M odule If both ports are crossed you must use an external crossover adapter to provide a proper connection The Off position disables crossover mode uncrosses and the On position enables crossover mode default therefore port eight is initially crossed over Squelch Mode Switch The Squelch mode switch allows you to set the Squelch level to high normal or low sensitive The On position sets the Squelch level to high default The High Squelch level conforms to the proposed 10BASE T standard In general 3Com recommends using High Squelch Introduction 1 7 The Off position sets the Squelch level to low When the Squelch level is set to low the ports are able to receive weaker signals Note that Low Squelch mode does not conform to the 10BASE T standard If you change the module s Squelch level to low you must change the 10BASE T Transceiver Squelch level to low also Refer to the ONline Ethernet 10BASE T Transceiver Installation Guide for information on setting the transceiver Squelch level On unshielded twisted pair cabl
25. er 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 5108M TP is shielded against radio interference in accordance with the provisions of Vfg 243 1991 The German Postal Services have been advised that this equipment is being placed on the market and that they have been given the right to inspect the series for compliance with regulations Compliance with applicable regulations depends on the use of shielded cables The user is responsible for procuring the appropriate cables EN55022 CISPR22 Compliance This equipment conforms to the Class A emissions limits for a digital device as defined by EN55022 CISPR22 VCCI Class 1 Compliance cir Ea e OR LAE ad BG ee ee LED AU E A IP PAA LA Nd TE 2 T CEBU AA ee ST LA T FL Ci Fa LAGE EPAL ERGOUN S Fih This equipmentisin the 1st Class category information equipment to be used in commercial or industrial areas 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 t
26. ers on the network meters of fiber cable The 4200 meters does not include the transceiver cable that is drop or patch cable that connects a device with an external transceiver Transceiver cables can extend up to 50 meters Thus total network diameter can be as much as 4300 meters 4200 m 2 50 m between any two nodes Designing and Expanding the Network 2 3 Table 2 1 Seven Basic Network Rules Continued Rule Definition Recommendations Notes 4 Certain LAN devices M any 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 lessthan maximum link distance In fact 4200 meters every microsecond delay shrinksthe network diameter by approximately 200 meters of fiber cable Table 2 2 lists the Equivalent Distances for other 3Com products 5 Assume that one Thisisa conservative rule of thumb meter of coaxial or twisted pairis equalto one meter of fiber cable For example the actual equivalence is about 1 1 meters of coaxial for every meter of fiber For simplicity assume one meter 2 4 ONline Ethernet 10BASE T M odule User s Guide Table 2 1 Seven Basic Network Rules Continued Rule Definition Recommendations Notes 6 Thefiberlink distances In general on 62 5 micron cable must not exceed the you can go up to 4000 meters limits imposed by the
27. f Chipcom Corporation Chipcom OpenHub G Man LANsentry M ultiProbe ONdemand ONline ONsemble PowerRing SL2000 SL3000 SL4000 Stack ack StackSystem and SwitchC entral are trademarks of Chipcom Corporation TheChipcom MultichannelArchitectureC ommunications System is registered under U S Patent Number 5 301 303 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 ii ONline Ethernet 10BASE T M odule User s Guide XNS is a trademark and Ethernet is a registered trademark of Xerox Corporation 3ComFacts Ask 3Com CardFacts NetFacts and CardBoard are service marks of 3Com Corporation 3Com LANplex BoundaryRouting LanScanner LinkBuilder NETBuilder NETBuilderll ParallelTasking ViewBuilder EtherDisk Etherl Link EtherLink Plus EtherLink Il TokenLink TokenLink Plus and TokenDisk are registered trademarks of 3Com Corporation 3ComLaser Library 3TECH CacheCard FDDILink FMS NetProbe SmartA gent Star Tek and Transcend are trademarks of 3Com Corporation CompuServe is a registered trademark of CompuServe Inc 3Com registered trademarks are registered in the United States and may or may not be registered in other countries Other brand and product names may be registered trademarks ortrademarks of their respect
28. he 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 Disdaimer 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 responsibilityforany errors that may appear in this document Copyright Statement 1995 by Chipcom Corporation a subsidiary of 3Com Corporation Printed in U S A All rights reserved 3Com is a registered trademark of 3Com Corporation ONcore is a registered trademark of Chipcom Corporation The information contained herein is the exclusive and confidential property of 3Com Corporation No part of this manual may be disclosed or reproduced in whole or in part without permission from 3Com Corporation Trademarks Because of the nature of this material numerous hardware and softw are 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 o
29. is document titles Ensure that you press the Apply button after you add the new search parameters ONline Ethernet LOBASE T Module User s Guide xiii 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 A Warning A Warning Wear eye condition may O protection when threaten performing these personal safety maintenance procedures Related Documents This section providesinformation on suppo rting documentation including O 3Com Documents o Reference Documents xiv ONline Ethernet 10BASE T M odule User s 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 M odels 5017C LS and 5017C with load sharing 6 Slot ONline System Concentrator Installation and Operation Guide Explains how to install operate and manage the 3Com ONline 6 Slot System Concentrator ONline Ethernet Management M odule Installation and Operation Guide Describes how to install the ONline Ethernet Network Management Module in the ONline System Concentrator and explains the LEDs on th
30. ive 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 10BASE T M odule User s Guide iii iv ONline Ethernet 10BASE T M odule User s Guide Contents How to Use This Guide AUQIENTE 2 x3 mih a wad hate lig DES Rae ha ea naa ha he bes xiii Structure of This Guide 2 RR RR eh xiv Document Conventions 0 0c ccc e RR rues XV Related Documents 0 0 0 sse RH eee xvi BCOM DOCUMENES i egeo Goto nr Eh he ade Boies xvii Reference Documents aaan aa a a xvii Chapter 1 Introduction The ONline Ethernet 10BASE T Module 0 cece eens 1 1 Indicators us ei he CR Aiea ewe nee de Me ee we ee ee ON 1 2 DIp SWIECh6S i e ae aventure LAS ENG eh ER Rane tobe a NG 1 4 Dip Switch SW1 Port Status cee eee 1 5 Dip Switch SW3 Crossover Mode Channel Select Squelch 1 6 Dip Switch SW6 Link Integrity 0 cee eee 1 9 Related Festufes p Sav pawns DAG ee ase Mee RERO RR E REGES 1 10 LED and Channel Verification 0 0 0 ccc ees 1 10 The ONline Ethernet Network Management Module 1 11 Chapter 2 Designing and Expanding the Network Understanding the General Rules 0 0 0 cc cece eee eee 2 2 Basic Network Rules 0 0 00 2 2 LAN Equivalence 2 0 c
31. iver should not exceed the distances as defined in Table 2 3 In this example the link cannot exceed 150 meters using the 10BASE T standard High Squelch mode and 22 gauge wire Table 2 3 Maximum Link Distance on Twisted Pair Cable Gauge Supports Link Distances Up To Unshielded Twisted Pair High Squelch Low Squelch 10BASE T 22 6mm 150m 200m 24 5mm 125m 150m Shielded Twisted Pair High Squelch Low Squelch IBM Type 1 22 6mm 200m 300m In areas of low noise the Squelch level can be lowered to accept weaker signals Low Squelch does not conform to the 10BASE T standard This allowsthe acceptable link distance to increase to 200 meters The LOBASE T standard limits link distance to approximately 200 meters equivalent to 1 usec of delay on unshielded twisted pair 10BASE T signaling can also be used on shielded twisted pair even though the standard does not include shielded twisted pair in its specification Since external noise does not affect signals on shielded twisted pair there is no restriction in using the Low Squelch level Using Low Squelch on shielded twisted pair allows link distances of up to 300 meters Nevertheless 3Com recommends that you always use the High Squelch setting except in situations where the link distance exceeds 200 meters 2 10 ONline Ethernet 10BASE T Module User s Guide Twisted Pair Backbone Twisted Pair To The Desk In constructing a twisted pair backbone one additio
32. le once the network expands beyond a certain size you need to add a bridge or other internetworking device This section describes general rules for configuring an Ethernet network using fiber as the backbone medium It also provides rules to ensure that your network configuration conforms to distance limitations imposed by Ethernet and networking equipment This section includes Q Basic Network Rules Q LAN Equivalence Basic Network Rules This section outlines the basic network rules and 3Com recommendations for these rules For more hardware specific information on the 10 Port module refer to Appendix A 2 2 ONline Ethernet 10BASE T Module User s Guide Table 2 1 outlinesthe seven basic rulesto keep in mind when you construct your network 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 cables a star topology to The extra cost is small and you will isolate faults find you need them asyour 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 distance between any two diameter is 4200 transceiv
33. le 1 4 and Table 1 5 foran explanation of the dip switch settings Figure 1 2 shows the location of the dip switches Indicators Channel Select Port 4 1234 2 3 Chanel Port 2 On On On 1 Port 3 Port4 Port Port 6 Port 7 Port 8 onl dl sws On or 2 Um Ur isolated Crossover Mode squelch Port 8 only Mode Port 1 1234 5678 Port Enable On Enable Off Disable Port 2 Port 3 Port 4 Port 5 1234 5678 on Jalal Jak o Port 6 we Link Integrity On Enable Off Disable Port 7 Port 8 Backplane DIN Connector Figure 1 2 10BASE T Module and Dip Switch Locations Dip Switch SW1 Port Status The eight switches on dip switch SW 1 allow you to enable or disable each of the eight ports The switches are labeled 1 through 8 and correspond to the respective eight ports The Off position disables the port and the On position enables the port The switch settings are initially configured in the Introduction 1 5 On position therefore all ports are initially enabled Table 1 2 describes the settings and functions for switches 1 through 8 Table 1 2 Dip Switch SW1 Settings and Interpretations Switch Setting Factory Enable disable port If you have an ONline Ethernet Network M anagement M odule installed in your concentrator you can remotely override these switch settings Refer to the ONline Ether
34. nal configuration rule must be considered o There can be no more than eight 10BASE T M odules in the path between any two transceivers due to the Ethernet four repeater rule each 10BASE T M odule counts asa 1 2 repeater You must add a bridge if you have more than eight 10BASE T M odules serially connected The configuration in Figure 2 2 illustrates a possible unshielded twisted pair network using 22 gauge cable 100 m 50m 20m Figure 2 2 Unshielded Twisted Pair Netw ork Note that when connecting two concentrators with twisted pair cable use port 8 on one of the 10BASE T M odules and disable crossover mode for that port This allows a direct connection to another 10BASE T Module without the need for an intervening adapter Refer to Dip Switch SW3 Crossover M ode Channel Select Squelch in Chapter 1 forinformation on crossover mode and the crossover mode switch setting Designing and Expanding the Network 2 11 While there is no fiber in this configuration the fiber equivalent distance can be calculated as follows Total link distance 150 m 100 m 100 m 50 m 20 m 420 m Total equivalent distance of 10BASE T M odules 4 420m 4 165m 2340 m signal externally enters four 10BASE T M odules 4 420 m signal enters four 10BASE T M odules from the backplane 4 165 m Total equivalent distance 420 m 2340 m
35. nce B 4 Distances Between 75 m Transceivers A amp B 150 m 1000 m 500 m 75 m Concentrator C BEER EE EEE Remaining Unshielded Twisted Pair Distance c a lalalelelo ol 0 0 09 alal Figure 2 1 Sample Configuration Distance Calculation Use the following steps to determine whether your network configuration is legal 1 Begin with 4 2 km 4200 m since this is the maximum network diameter for a pure fiber network Rule 3 2 Subtract 100 m for the signal exiting the Fiber M odules in concentrators A and C 2 50 and 280 m forthe signal entering the Fiber M odulesin concentrators C and B 2 140 as explained in Rule 4 and defined in Table 2 2 3 Subtract 420 m of fiber equivalent distance for the signal entering the 10BASE T M odule in concentrator A and 165 m for the signal exiting the 10BASE T M odule in concentrator B Rule 4 4 Subtract all cable lengths between the two transceivers and if the result is greater than zero the configuration is within legal Ethernet limits Rule 5 Designing and Expanding the Network 2 9 For the configuration shown in Figure 2 1 to work the fiber equivalent distance between transceiver A and transceiver B must be less than 4200 meters As you can see in the calculation there are still 1510 meters left for expansion in this configuration Be aware that the link from a 10BASE T M odule to a 10BASE T Transce
36. net Network M anagement M odule Installation and Operation Guide for information on remotely managing the ports Switch Dip Switch SW3 Crossover Mode Channel Select Squelch The four switches on dip switch SW3 allow you to Q set port 8 to uncrossed mode Q select a channel for the module Q set the Squelch level to high normal or low sensitive The switches are labeled 1 through 4 and the settings affect all eight ports Switch 1 allows you to enable or disable crossover mode for port 8 The channel is initially configured for channel 1 default and Squelch level is initially configured for high default The following sections explain the crossover channel selection and Squelch mode If you have an ONline Ethernet Network M anagement M odule installed in your concentrator you can remotely override these switch settings 1 6 ONline Ethernet 10BASE T M odule User s Guide Table 1 3 explains crossover mode and squelch mode switch settings and the sections following the table explain these features in more detail The channel selection switches are discussed in Table 1 4 Table 1 3 Dip Switch SW3 Settings for Switches 1 and 4 Factory Switch Setting Switch Function Default Off On 1 Enable disable enable disable enable crossover mode for uncrossed crossed port 8 only 4 Squelch mode high low high Crossover M ode Switch All eight ports on the 10BASE T M odule are internally crossed over as p
37. on detection 100 deterministic Maximum number of nodes 1024 Configuration rules supports IEEE 802 3 controllers and IEEE 802 3 repeaters Jabber Protection 6 5 milliseconds Port Connectors Shielded 8 pin modular telephone jack compatible with an unshielded connector Cabling 22 24 or 26 AWG unshielded or shielded twisted pair cable Cable differential impedance 85 ohms to 150 ohms over 1 to 16 M Hz band A 2 ONline Ethernet 10BASE T M odule User s Guide Cable propagation velocity 5 585c Host Interface 3Com ONline System Concentrator bus interface standard Installation Attachment Two thumbscrews on the mounting bracket Twisted Pair Connectors and Cables There are many types of cables and connectors that you can use to link your 10BASE T M odule 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 is divided into the following parts Q Twisted Pair Connectors Q Twisted Pair Cables Twisted Pair Connectors ThelEEE 802 3 10BASE T standard for pin outs must be used The following cable standard must be used 10BASE T uses2 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 Datagrade cable should have the following pin p
38. on of ONline s TriChannel architecture The channel select switch settings switches 2 and 3 on dip switch SW3 let you select a channel Switches 2 and 3 are factory set to On therefore the 1 8 ONline Ethernet 10BASE T M odule User s Guide 10BASE T M odule is initially configured to channel 1 To reconfigure the module to a different channel refer to the information in Table 1 4 Table 1 4 Dip Switch SW3 Settings and Interpretations for Switches 2 and 3 Switch 2 Switch 3 Channel Selection Switch Setting On On 1 default On Off 2 Off On 3 Off Off Isolated module operates independent of any channel If you have an ONline Ethernet Network M anagement M odule installed in your concentrator you can remotely override these switch settings Dip Switch SW6 Link Integrity The eight switches on dip switch SW 6 allow you to enable or disable Link Integrity for each port The switches are labeled 1 through 8 and correspond to the eight ports The On position enables Link Integrity for each port default and the Off position disables Link Integrity for each port The switch settings are initially configured in the On position therefore all eight ports have Link Integrity enabled as per the 10BASE T standard In general you should enable Link Integrity To conform to the 10BASE T standard for example a connection requires Link Integrity to be enabled You must disable Link Integrity to connect to older equi
39. ound just before you handle the module Installing and Operating the Module 3 1 Unpacking Procedures Use the following procedure when unpacking your 10BASE T M odule 1 Verify that the 10BASE T M odule is the correct model by matching the model number listed on the side of the shipping carton to the model number you ordered 5108M TP Note that the product model number printed on the shipping box differs from the model number on the product The model number on the shipping box contains the prefix 3C9 2 Remove the 10BASE T M odule from the shipping carton 3 Remove the module from the anti static shielding bag and inspect it for damage Always handle the 10BASE T M odule by the faceplate being careful not to touch the components If the module appears to be damaged replace it in the anti static shielding bag return it to the shipping carton and contact your local supplier 3Com suggests you keep the shipping carton and anti static shielding bag in which your module was shipped in case you later want to repackage the module for storage or shipment We also suggest that you record the serial number of your 10BASE T Module We have provided a log for this and other information specific to your modules under the Slot Usage Chart in Appendix B of the ONline System Concentrator Installation and Operation Guide Installation Procedures You do not need to power down the ONline System Concentrator to install the 10BAS
40. pment which does not conform to the 10BASE T standard Link Integrity must either be enabled at both ends of the link or disabled at both ends or the module will report a Link Integrity error Introduction 1 9 If you enable a port and disable Link Integrity the Status LED is on for 10 seconds and blinks off for 400 msecs to indicate that Link Integrity is disabled Table 1 5 lists the settings and functions for switches 1 through 8 Table 1 5 Dip Switch SW6 Settings and Interpretations Switch Setting P Factory Enable disable link integrity If you have an ONline Ethernet Network M anagement M odule installed in your Concentrator you can remotely override these switch settings Switch enable Related Features The following sections describe functions which allow you to Q check the module s channel assignment and LED functionality Q remotely manage the 10BASE T Module LED and Channel Verification The ONline Controller M odule is equipped with an LED Channel Check button on the front panel The LED Channel Check button has two functions it causes all LEDs in all modulesin the concentrator to light and it causes each module to identify the channel to which it is assigned When you activate this button it causes all module LEDs to light for approximately five seconds Any LED that does not light is defective After the five seconds elapse the diagnostic continues with a channel check of all modules This
41. rsion of software installed on your 10BASE T M odule Status of the front panel LEDs Configuration of your concentrator you may find it helpful to refer to the Slot Usage Chart in Appendix B of the ONline System Concentrator Installation and Operation Guide for a record of this information Reber to Appendix B for instructions on contacting Technical Support for your product 4 6 ONline Ethernet 10BASE T M odule User s Guide Specifications ONline Ethernet 10BASE T Module Specifications This appendix lists specifications for the 10BASE T M odule There are five subsections Q Electrical Specifications Environmental Specifications M echanical Specifications General Specifications D D D D Twisted Pair Connectors and Cables Electrical Specifications Backplane Interface 96 pin edge connector compatible with the 3Com ONline System Concentrators Power Requirements 1 75 A for 5V Fuse 4 0 Amps Fast blow Watts 8 75 Specifications A 1 Environmental Specifications Operating Temperature 0 to 50 C 32 to 122 F Storage Temperature 30 to 65 C 22 to 149 F Humidity less than 95 non condensing BTU hr 30 Mechanical Specifications Dimensions 1 0 W x10 25 Lx8 5 H 2 54 cm x 26 04 cm x 21 6 cm Weight 1 25 Ib 0 57 kg General Specifications Data Rate 10 Mbps million bits per second Data modulation M anchester Diagnostic modulation Link Integrity pulse Collisi
42. rt 165 meters for signals that internally enter a 10BASE T M odule via the ONline Concentrator backplane Thus for every pair of LOBASE T M odulesthat a signal goesthrough there isa fiber equivalent distance of 585 meters 420 m 165 m 2585 m This isalso true if a signal makesa roundtrip through a single 10BASE T M odule i e enters a TOBASE T port externally and exits through another port on the same 10BASE T M odule This counts as 585 meters of fiber equivalent distance and as a full repeater Fiber Backbone Tw isted Pair To The Desk Example In the sample configuration shown in Figure 2 1 we determine if the transceivers are within legal Ethernet limits This example is applicable to both unshielded and shielded twisted pair cables Note that 22 gauge unshielded twisted pair cable is used to connect 10BASE T Transceivers to the 10BASE T Modules in the concentrators The first step is to identify the two transceivers that are likely to be the greatest fiber equivalent distance apart In this case they are TOBASE T Transceivers A and B 2 8 ONline Ethernet 10BASE T Module User s Guide 1000 m Concentrator A Be a Q a a 0 eem Unshielded Twisted Pair 1 Maximum Diameter A 2 Fiber Modules Equivalent 50m 140m Concentrator B Distance 50 m 140 m 3 UTP Modules Equivalent 420 m 165 m Unshielded Twisted Pair Dista
43. shielded and unshielded twisted pair configurations Chapter 3 Installing and Operating the M odule Providesillustrated procedures for installing the 1OBASE T M odule into the ONline System Concentrator Chapter 4 Troubleshooting Provides help in isolating and correcting problems that may arise during the installation process and during normal operation Appendix A Specifications Provides electrical environmental and mechanical specifications as well as other information for the module Appendix B Technical Support Lists the various methods for contacting the 3Com technical support organization and for accessing other product support services Index xii ONline Ethernet LOBASE T M odule User s Guide Document Conventions The following document conventions are used in this manual Convention Courier text Indicates User input Example Inthe Agent Information Form enter MIS 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 emphas
44. upports up to 150 meter link distances on 22 gauge wire up to 125 meters on 24 gauge wire and up to 100 meters on 26 gauge wire Q supports up to 200 meter link distance on IBM Type 1 cabling Q complies fully with the 10BASE T standard o features hot swap capability so that you can install or remove the module without having to power down the concentrator The 10BASE T M odule works with both unshielded and shielded twisted pair wire A single module can support any mix of shielded and unshielded twisted pair connections For example ports 1 2 and 6 can be unshielded Introduction 1 1 twisted pair connections while ports 3 4 5 and 7 are shielded twisted pair connections In addition to complying with the 10BASE T standard each port provides support for features that are beyond the scope of the 10BASE T standard Q supports shielded twisted pair cable o allowsLow Squelch level which significantly increases achievable link distances o allowsLink Integrity to be disabled which allows connection to some equipment which does not conform to the 10BASE T standard Before installing the Ethernet 10BASE T M odule read the ONline System Concentrator Installation and Operation Guide Indicators The 10BASE T M odule has eight Activity and eight Status LEDs on the front panel that indicate the state of each port on the module Figure 1 1 shows the locations of these indicators and Table 1 1 describes how to read them
45. y 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 RMA number for Integrated Systems Division products formerly Chipcom use the following numbers Country Telephone Number Fax Number U S and Canada 800 724 2447 508 787 3400 Europe 44 1442 275860 No Fax Asia Pacific 508 787 5296 508 787 3400 Accessing the 3Com MIB The 3Com M anagement Information Base M IB forthe Integrated Systems Division describes commands that enable you to manage 3Com SNM P based products The M IB is available over the Internet on an anonymous FTP server Updates to these M IBs are released as new 3Com products are introduced To access Internet versions 1 FIP to ftp chipcom com 151 104 9 65 2 Enter the login name anonymous B 4 ONline Ethernet 10BASE T M odule User s Guide 3 Enter your full Internet e mail address as the password for example jdoe company com 4 Changeto the mib or schema directory using the ca 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 CTRL Q 6 Copythe MIB OID or schema filesto your current directory using the appropriate command for example get chipcom mib 7 To exit the FT
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