Cabletron Systems 3H02-04, 3H08-04 manual Fast Ethernet PIN Assignments, About RJ45 Connectors

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Appendix B: Cables

NOTE

You can also choose to use 50/125, 80/125, or 100/140 micron core multimedia fiber; however, data in the table above applies only to the 62.5/125 type.

B.3 FAST ETHERNET PIN ASSIGNMENTS

B.3.1 About RJ45 Connectors

If you’re connecting a 3H02-04 to another device, it’s required that you use only RJ45 connectors on the cabling. An Ethernet twisted-pair link segment requires two pairs of wires. Each wire pair is identified by solid and striped colored wires. For example, one wire in the pair might be red and the other wire, red with white stripes.

NOTE

You must connect each wire pair to the RJ45 connectors in a certain orientation (See “Crossover Wiring for the 3H02-04” on page B-3 for an explanation).

Refer to the diagram below and note how the pins are numbered. Be sure to hold the connectors in the same orientation when connecting the wires to the pins.

1 2 3 4 5 6 7 8

TX+ RX-

TX- RX+

1 1 8

8

Figure B-1 RJ45 Connector Pin Numbers

Each twisted-pair link segment must have an RJ45 male connector attached to both ends. According to the 100BASE-T specification, pins 1 and 2 on the RJ45 connector are used for transmitting data; pins 3 and 6 are used for receiving data, as shown below.

Page B-2

FE Switch Module User Guide

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Contents Fast Ethernet Switch Module User GuidePage FE Switch Module User Guide FCC Notice Cabletron SYSTEMS, INC. Program License Agreement United States Government Restricted Rights Contents Contents Chapter Introduction FastNET ATXUsing this Manual 3H02-04 FE Switch Module Overview3 Offline Button ConnectorsLEDs 3H08-04 FE Switch Module 3H08-04 Front PanelDocument Conventions Related Manuals Getting HelpFE Switch Module User Guide Chapter Connecting to the Network POWER-UP LED SequenceConnecting to a Network Connecting the 3H02-04 FE Switch ModuleConnecting the 3H08-04 FE Switch Module 3H08-04 Front Panel ConnectionsFE Switch Module User Guide Chapter Configuring Connecting the Local Console Manager Local Console Manager CommandsDisplaying Switch Module Port Status Chapter MonitoringMonitoring Displaying Switch Module Port Status Monitoring FE Switch Module User Guide POWER-UP Results Chapter Diagnostics and TroubleshootingPOWER-UP Tests Operational Diagnostics Diagnostics and TroubleshootingIf the Module Fails to Power Up Diagnostic ResultsTroubleshooting Connectivity Problems Chapter ADDING/SWAPPING Modules Unpacking the Switch ModuleAdding a Switch Module Swapping a Switch Module Swapping a Switch Module FE Switch Module User Guide Appendix a Technical Specifications TCP/IP IPX3H02-04 RJ45 for UTP 3H08-04 ST for Fiber Optics Appendix B Cables TYPES/CONNECTORSCable Specifications About RJ45 Connectors Fast Ethernet PIN AssignmentsCrossover Wiring for the 3H02-04 Fast Ethernet Pin Assignments5 Definitions Straight-Through Wiring for the 3H02-04Limitations & Restrictions Index Index Index-2 FE Switch Module User Guide