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3Com 3CR17450-91, 3CR17451-91 manual Modem Cable, RJ-45 Pin Assignments, RJ-45 to RS-232 25-pin

Models: 3CR17451-91 3CR17450-91

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70APPENDIX B: PIN-OUTS

Modem Cable	RJ-45 to RS-232 25-pin
	Switch 3870		RS-232 Modem Port
	Cable connector: RJ-45 female		Cable connector: 25-pin male
	Screen	Shell	1	Screen
	TxD	3	2	TxD
	RxD	2	3	RxD
	RTS	7	4	RTS
	CTS	8	5	CTS
	DSR	6	6	DSR
	Ground	5	7	Ground
	DCD	1	8	DCD
	DTR	4	20	DTR

RJ-45 Pin Assignments

Pin assignments are identical for 10/100 and 1000 RJ-45 connectors.

Table 10 Pin assignments

Pin Number	10/100	1000

Ports configured as MDI
1	Transmit Data +	Bidirectional Data A+
2	Transmit Data -	Bidirectional Data A-
3	Receive Data +	Bidirectional Data B+
4	Not assigned	Bidirectional Data C+
5	Not assigned	Bidirectional Data C-
6	Receive Data –	Bidirectional Data B-
7	Not assigned	Bidirectional Data D+
8	Not assigned	Bidirectional Data D-

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3Com 3CR17450-91, 3CR17451-91 manual Modem Cable, RJ-45 Pin Assignments, RJ-45 to RS-232 25-pin, Pin Number 10/100 1000

Contents

SuperStack 3 Switch 3870 Family Getting Started Guide 3Com Corporation Campus Drive Marlborough MA USA United States Government Legend Contents Setting UP for Management PIN-OUTS Page About this Guide Conventions Icon DescriptionConvention Description Related DocumentationDocumentation documentation To access the online documentation from the CD-ROM Comments Switch 3870 Hardware Features Switch Switch Front View Detail 1000BASE-T Ports Color Indicates Port Status/Packet LEDs Stacking Status LEDStack Master LED Power/Self Test LED Fault LEDColor Indicates Module LEDs Unit LED View Detail Feature Switch Port Status Duplex ModeType of Unit Total Units in the Stack Maximum Modules Port Port Speed Default Settings Introducing the Superstack 3 Switch Installing the Switch Package Contents Choosing a SuitableSite Power lines and fluorescent lighting fixtures To rack-mount your SwitchSwitch, as shown in Figure Rack-mounting Repeat steps 2 and 3 for the other side of the Switch Fitting a bracket for rack-mounting Power-up Powered-up and ready for operationSwitch Sequence Power System output Cross-over Cable Straight-through Cable SFP Operation Remove the plastic protective cover if fitted Your Switch TransceiverRemoving an SFP Installing the Switch Setting UP for Management Setting Up Overview Manual IP Configuration Automatic IP Configuration Setting UP for Management Manually Configuring IP Information Pre-requisites Connecting the Workstation to the Switch Setting Up the Switch with IP Information Example top-level command line interface menu Configured IP ViewingAutomatically Viewing Automatically Configured IP Information Viewing IP Information via the Console Port Refer to Setting Up Command Line Interface Management on Command Line Interface ManagementWeb Interface Management Network Using Telnet Where xxx.xxx.xxx.xxx is the IP address of the Switch Setting Up Web InterfaceChoosing a Browser Over the Network Setting Up Snmp Default UsersPasswords User Default Access Level Name Password Security Device User Modify operation on the web interface Problem Solving Solving Problems Power/Self Test LED does not lightOn powering-up, the Power/Self Test LED remains yellow Indicated by LEDs Problems Refer to the list of suggested solutions belowSolving Hardware Port Status LED is flashing green/yellow Fan failure warning message is received Unit fails or Snmp thermal shutdown trap is received Solving Communication Problems Error message indicating that the SFP transceiver is faultyIP Addressing How do you obtain a registered IP Address? Solving Software Upgrade Problems Problem Solving Safety Information Power Cord Set Japan Important Safety Information This must be approved for the country where it is used Important Safety Information ’information de Sécurité Importante Class ’information de Sécurité Importante Dispositif Laser De Classe Wichtige Sicherheitsinformationen Vorsicht Europe Información de seguridad importante Laser Gerät der Klasse Schuko Appendix a Safety Information Importanti Informazioni di Sicurezza CSA Solo Regno Ważne informacje o zabezpieczeniach Appendix a Safety Information Laser Produkt Klasa Appendix a Safety Information PC-AT Serial Cable Null Modem Cable RJ-45 to RS-232 25-pinRJ-45 to 9-pin Modem Cable RJ-45 Pin AssignmentsRJ-45 to RS-232 25-pin Pin Number 10/100 1000 Pin Number 10/100 1000 Appendix B PIN-OUTS Switch 3870 24 Port Switch 3870 48 Port Product to Gain Service Benefits ServicesRegister Your Purchase Access Software DownloadsContact Us Telephone Technical Australia 800 678 Philippines US and Canada Telephone Technical Support and Repair Index SFP Page Chapter Index Regulatory Notices