3Com 3CR17450-91, 3CR17451-91 Table11 Pin assignments

RJ-45 Pin Assignments 71

Table11 Pin assignments

Pin Number 10/100 1000

Ports configured as MDIX

1Receive Data + Bidirect ional Data B+

2Receive Data - Bidirectional Data B-

3Transmit Data + Bidirectional Data A+

4Not assigned Bidirectional Data D+

5Not assigned Bidirectional Data D-

6Transmit Data - Bidirectional Data A-

7Not assigned Bidirectional Data C+

8Not assigned Bidirectional Data C-

DUA1745-0AAA03.book Page 71 Friday, April 8, 2005 12:34 PM

Contents

Main 3Com Corporation 350 Campus Drive Marlborough MA USA 01752-3064 C ABOUT THIS GUIDE INTRODUCING THE SUPERSTACK 3 SWITCH 3870 INSTALLING THE SWITCH SETTING UP FOR MANAGEMENT P ROBLEM S SAFETY INFORMATION PIN-OUTS TECHNICAL SPECIFICATIONS O BTAINING S UPPORT FOR YOUR P I REGULATORY NOTICES Page ABOUT THIS GUIDE Conventions Tab le 1 Notice Icons Tab le 2 Text Conventions Related Accessing Online Documentation Comments 1 SWITCH 3870 About the Switch 3870 Summary of Hardware Feature s Table3 summarizes the hardware features that are supported by the Switch 3870. Tab le 3 Hardware feature s Switch 3870 Front View Detail 11 DUA1745-0AAA03.book Page 11 Friday, April 8, 2005 12:34 PM Switch 3870 Front View Detail Figure 1 Switch 3870 (24 ports) front view Figure 2 Switch 3870 (48 ports) front view Page Tab le 4 LED behavior Page Switch 3870 Rear View Detail Tab le 5 Maximum Stack Configurations Tab le 6 Default Settings Default Settings one of the Switch units, it is returned to these defaults. Page Page 2 Package Contents Choosing a Suitable Site Rack-mounting Placing Units On Top of Each Other The Power-up Sequence Page SFP Operation Page Page Page 3 30 CHAPTER 3: SETTING UP FOR MANAGEMENT DUA1745-0AAA03.book Page 30 Friday, April 8, 2005 12:34 PM Setting Up Overview Configure IP information manually for your Switch or view the automatically configured IP information Prepare for your chosen method of management Figure 6 Initial Switch Setup and Management Flow diagram Page Page Manually Configuring IP Information Page Page Viewing Automatically Configured IP Information Page Page Methods of Managing a Switch Setting Up Command Line Interface Page Setting Up Web Interface Management Setting Up SNMP Default Users and Passwords Page 4 Solving Problems Indicated by LEDs Solving Hard ware Problems Page Solving Communication Problems Page Page Page A Power Cord Set Japan Important Safety Information Page Linformation de Scurit Importante Page Page Wichtige Sicherheitsinformationen Informacin de seguridad importante Page Page Importanti Informazioni di Sicurezza Page Wane informacje o zabezpieczeniach Page Page Page B Null Modem Cable PC-AT Serial Cable Modem Cable RJ-45 Pin Assignments Pin assignments are identical for 10/100 and 1000 RJ-45 connectors. Table11 Pin assignments Page C Switch 3870 (24 Port) Switch 3870 (48 Port) D P Register Your Product to Gain Service Benefits Purchase Value-Added Services Troubleshoot Online Access Software Downloads Contact Us Telephone Technical Support and Repair Page Page I A C D E S T W Page Page REGULATORY NOTICES FCC S I NFORMATION T O T HE U CSA S VCCI S