3Com 3C16988A, 3C16987A, 3C16986A, 3C16985B manual Modem Cable, RJ45 Pin, Assignments, Connectors

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44APPENDIX B: PIN-OUTS

Modem Cable	9-pin to RS-232 25-pin
	Switch 3300 XM, SM, TM, MM		RS-232 Modem Port
	Cable connector: 9-pin 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

RJ45 Pin	Pin assignments are identical for 10BASE-T and 100BASE-TX RJ45
Assignments	connectors
	Table 7 Pin assignments

Pin Number	Signal	Function

Ports configured as MDI
1	TxData +	Transmit data
2	TxData –	Transmit data
3	RxData +	Receive Data
4	Not assigned
5	Not assigned
6	RxData –	Receive data
7	Not assigned
8	Not assigned

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Contents SuperStack 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents PIN-OUTS Glossary Index Regulatory Notices Page About this Guide Conventions List conventions that are used throughout this guideRelated DocumentationRegistration CommentsProduct 3300 XM, SM, TM, MM Introducing the Switch 3300 XM, SM, TM, MM Switch Front View Detail 1000BASE-SXIntroducing the Switch 3300 XM, SM, TM, MM LED behavior Switch Rear View Detail Unit Information LabelSwitch Rear View Detail Examples ConfigurationNetwork Using the Switch as a collapsed backbone Using the Switch in a desktop environment Fast Ethernet configuration rules Introducing the Switch 3300 XM, SM, TM, MM Configuration Rules for Gigabit Ethernet SM and TM Gigabit Ethernet cablingIntroducing the Switch 3300 XM, SM, TM, MM Installing the Switch Installing the Switch Connect network cabling Repeat steps 2 and 3 for the other side of the SwitchRack-mounting Installing the Switch Using Matrix Cables Stacking UnitsTreated as a single manageable unit with one IP address Part number 3C16965. Contact your supplier for detailsStack of two units Stack of three units Sequence Power-upTM or MM powered-up and ready for operation Choosing Switch Network. For information on managing the Switch usingManaging GuideSafety Information Important Safety InformationImportant Safety Information ’information de Sécurité Importante’information de Sécurité Importante Wichtige Sicherheitsinformat ionen Warnhinweis Faseroptikanschlüsse Optische Sicherheit Appendix a Safety Information Null Modem Cable PC-AT Serial CablePin to RS-232 25-pin Pin to 9-pinConnectors Modem CableRJ45 Pin AssignmentsPin Number Signal Function Appendix B PIN-OUTS Technical Specifications Switch 3300 XM, SM and MMSwitch 3300 TM SnmpVlan MIB RFC Appendix C Technical Specifications Services Online TechnicalUsername anonymous Asia, Pacific Rim Country Telephone Number Fax Number Glossary Can be due to faulty network devices Process of sending a packet toward its destination using aUnauthorized access to a network or network devices Process is known as filteringLine speed See baud Glossary STP See Spanning Tree Protocol STP Glossary Index Index Regulatory Notices

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