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3Com 10005622, 3C39024, 3C39036 6-2 CHAPTER 6: TROUBLESHOOTING THE SYSTEM

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6-2 CHAPTER 6: TROUBLESHOOTING THE SYSTEM

Table 6-1 Troubleshooting Power Failures

Symptom Possible Sources of the Problem Steps to Take

System does not power up. ■System is not receiving power.

■Power supply malfunctioned.

1Verify that the building’s power outlet has power.

2Check that the power cord is firmly plugged into the system and either the

building’s power outlet, the redundant power system, or the

uninterruptible power system.

3If you are using an RPS or a UPS, check that it is firmly plugged into the

building’s power outlet.

4Try another power cable.

5If the system still does not operate, contact 3Com Technical Support or

your service representative.

Table 6-2 Troubleshooting Abnormal System LED Activity

LED Status Possible Sources of the Problem Steps to Take

Fault LED blinks yellow. Diagnostic software is not running. 1Check the Administration Console display.

2Call 3Com Technical Support or your service representative.

Power LED does not light. System has failed. 1Shut down the system by disconnecting the power plug.

2Call 3Com Technical Support or your service representative.

Contents

Main 3Com Corporation 5400 Bayfront Plaza Santa Clara, California 95052-8145 Page Page C ONTENTS P U OWER 5 PECIFICATIONS ARRANTY W IMITED A BOUT Finding Specic Information in This Guide Introduction T Conventions Table 1 and Table 2 list conventions that are used throughout this guide. SuperStack II Switch 3900 Documentation Paper Documents Documents on CD-ROM Related Publications Documentation Comments Page Page 1 Switch 3900 Intelligent Switch 1-2 CHAPTER 1: SWITCH 3900 SYSTEM AND SETUP OVERVIEW System Overview 24-Port Front Panel Super Stack II Switch 3900 Figure 1-1 Front Panel of the 24-Port SuperStack II Switch 3900 Ethernet Ports Provide 24 10/100BASE-TX (RJ-45) Ethernet ports System and Port LEDs Provide information about the system and each port System Overview 36-Port Front Panel Figure 1-2 Front Panel of the 36-Port SuperStack II Switch 3900 Ethernet Ports Provide 36 10/100BASE-TX (RJ-45) Ethernet ports System and Port LEDs Provide information about the system and each port System Overview Back Panel of Both Models System Features and Benets System Management Optional Gigabit Ethernet Modules Network Conguration Example Providing Dedicated Links for Fast Ethernet Network Conguration Sample 1-7 Network Conguration Sample Figure 1-4 SuperStack II Switch 3900 Provides Dedicated Fast Ethernet Links 36-Port SuperStack II Switch 3900 Switched Gigabit server farm Switched 100 Mb desktop systems Page 2 Before You Begin 2-2 CHAPTER 2: INSTALLING THE SYSTEM Installing the System on a Table Top or in a Free-Standing Stack Figure 2-1 Stacking the Switch 3900 corners of the unit. 5Turn the system onto its feet. 6Verify that the air intake vents and fan exhaust vents Place the feet of one system into the mounting recesses of the system below it. Installing the System in a Distribution Rack Preparing the System and Rack Page Mounting the System into a Distribution Rack Page 3 Overview of Cabling Fiber Safety Precautions Fast Ethernet Ports Cabling 10/100BASE-TX (RJ-45) Ports Fast Ethernet Ports 3-3 Figure 3-1 shows the cabling of a 10/100BASE-TX (RJ-45) port. 10/100BASE-TX (RJ-45) Connector Pin Assignments Table 3-1 provides the pin assignments for the RJ-45 connectors. Male RJ-45 connector 10/100BASE-TX cable Port 7 Gigabit Ethernet Ports Cabling Gigabit Ethernet Ports Cabling the Console Port Page Cabling the Console Port 3-7 Console Port Pin Assignments Table 3-2 shows the DB-9 pin assignments for the Console port. Page 4 Power Options AC Power Cord Optional Advanced Redundant Power System Optional Uninterruptible Power System Power Up To Power the Switch 3900 with the RPS To Power the Switch 3900 from the Wall Receptacle Power-up Diagnostics System Diagnostics Ethernet Port Diagnostics 4-4 CHAPTER 4: SYSTEM POWER UP System and Port Status LEDs Figure 4-1 System and Port Status LEDs on the SuperStack II Switch 3900 Status Super Stack II Switch 3900 30x System Checks Next Step: Software Conguration Page 5 MANAGEMENT ACCESS About Switch 3900 System Management How Do You Want to Manage the System? Terminal Connection Initial Management Access Setting the Console Port Baud Conguring the IP Interface Page 6 Getting Additional Help Diagnosing Problems Power Failures Abnormal LED Activity 6-2 CHAPTER 6: TROUBLESHOOTING THE SYSTEM Diagnosing Problems 6-3 Cleaning Dirty Fiber Optic Ports and Connectors A A-2 APPENDIX A: SYSTEM SPECIFICATIONS B General Safety Requirements Wiring Closet Recommendations Distribution Rack Requirements Protective Grounding for the Rack Space Requirements for the Rack Mechanical Requirements for the Rack Building and Electrical Codes Building Codes Electrical Codes Page C Online Technical Services World Wide Web Site 3Com FTP Site 3Com Bulletin Board Service Support from Your Network Supplier Support from 3Com C-3 Support from 3Com number revision levels if applicable Below is a list of worldwide technical telephone support numbers: C-4 APPENDIX C: TECHNICAL SUPPORT Returning Products for Repair INDEX Numbers A B C G H I L M S T U V W Page 3Com Corporation L IMITED W H S YEAR 2000 WARRANTY OBTAINING WARRANTY SERVICE LIMITATION OF LIABILITY D GOVERNING LAW