Cabletron Systems ELS10-26TX manual Crossover Wiring, 5 4 3 Rule

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Technical Speciﬁcations

A.5 CROSSOVER WIRING

Two ELS10-26s can communicate only if the transmitter on one unit is connected to the receiver on the other unit. This reversal, or crossover function, can be implemented either in the wiring or in the device itself. When connecting ELS10-26s, a crossover must be implemented in the wiring. Refer to Table A-5 for crossover pin assignments.

Table A-5. Crossover RJ45 Pin Assignments

	ELS10-26		ELS10-26

1	(Rx+)	3	(Tx+)

2	(Rx-)	6	(Tx-)

3	(Tx+)	1	(Rx+)

6	(Tx-)	2	(Rx-)

A.6 5 - 4 - 3 RULE

Between any two nodes (i.e., PCs or other stations) on the network, there can be:

•Up to ﬁve segments in series

•Up to four repeaters or multi-port hubs

•Up to three populated segments (that is, segments attached to two or more PCs). The remaining two segments are unpopulated; these are known as inter-repeater links or IRLs. This distinction between populated and unpopulated segments is signiﬁcant for coax networks only.

Note: This rule is completely consistent with the IEEE 802.3 specification, and is meant only to summarize the configuration specification.

A-6

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Contents ELS10-26 User Guide Page FCC Notice DOC Notice Cabletron Software Program License Declaration of Conformity Contents Contents Monitoring and Managing Your ELS10-26Appendix B Glossary ELS10-26 Diagnostics and TroubleshootingAppendix a Technical Specifications Contents Viii Chapter Introduction About this Manual Getting Help BBSDocument Conventions Related Documentation Overview ELS10-26TX Front PanelSmartSTACK 10 ELS10-26 Architecture Store and Forward Switching OSI Reference ModelTypical Switching Application Discarding Local TrafﬁcSpanning Tree Algorithm SmartSTACK 10 ELS10-26 Bridge Address TableIntroduction SmartSTACK 10 ELS10-26 Sample Applications SmartSTACK 10 ELS10-26 Port MonitoringPacket Capturing and Monitoring SmartSTACK 10 ELS10-26 Trunking SmartSTACK 10 ELS10-26 Trunking with 10 Mbps PortsSmartSTACK 10 ELS10-26 Fast Ethernet SmartSTACK 10 ELS10-26 Backbone ConﬁgurationSmartSTACK 10 ELS10-26 Trunking with 100 Mbps Ports Virtual Workgroups Trafﬁc Workgroup a Workgroup B Local Console Manager Command Syntax Conventions Basic LCM Commands HelpELS10-26 Local Console Manager Traplog EraseExit or Logout Chapter Unpacking and Installing Your ELS10-26 ELS10-26 Front PanelReset Switch Status LEDs ACT Installing AN Fepim Describes the ELS10-26 buttonsInstalling an Fepim Installing the ELS10-26 Rack-mounting an ELS10-26Attaching Rackmount Brackets Checking the POWER-UP Diagnostics Sequence Connecting the Local Console Manager Connecting to the NetworkConnecting UTP Cables 10BASE-T/ 100BASE-TXConnecting a UTP Segment to the FE-100TX Cable Pinouts RJ45 Crossover CableFE-100TX Crossover Switch Connecting a Multimode Segment to the FE-100FX Fiber Optic Network ConnectionFE-100FX Port Unpacking and Installing Your ELS10-26 Unpacking and Installing Your ELS10-26 Chapter Configuring Your ELS10-26 Spectrum Spel SpmaAssigning IP Addresses Type ipaddr PORT-NUMBER IP Address Changing a Subnet Mask Displaying IP AddressesDeleting an IP Address Enabling Bridging To change the subnet mask, at the LCM promptDisabling Bridging Displaying Bridging FunctionsEnabling Trunking Trunk Groups Trunk ConnectionsTrunk Groups Disabling Trunking Displaying Trunking Status Display could look like the followingEnabled, Rip listening Enabling Port Monitoring Disabling Monitoring Displaying Monitoring StatusEnabled, Rip listening Defining and Deleting Workgroups Deﬁning Virtual WorkgroupsLCM responds with the following display Assigning a Community Name Configuring BROADCAST/MULTICAST Storm Protection Modifying MIB Variables System ContactCommunity Names System NameSystem Location Set Community Name Aging ParameterELS10-26 Statistics Chapter Monitoring and Managing Your ELS10-26ELS10-26 Management Tools Gathering Statistics System StatisticsEthernet Port Statistics Using LCM to Check ELS10-26 Status Displaying StatusEnabled, Rip listening Displaying MAC Addresses To display all MAC addresses, at the LCM prompt Displaying Manufacturing Information LCM would displayUsing LCM to Manage the ELS10-26 Managing the ELS10-26Disabling a Port Enabling a PortNoRIP Option Changing a Community Name Setting the Baud Rate Setting a Reboot Time Power-up LED Sequence Chapter ELS10-26 Diagnostics and TroubleshootingPOWER-UP Diagnostics Speciﬁc Power-up Tests Software Checksum ComparisonStatus and Activity Indicators Power-up Diagnostics ResultsResponses to Failures AT POWER-UP ELS10-26 Front Panel LEDs LED Connectivity Problems TroubleshootingELS10-26 does not Power UP 2 ELS10-26 Has Rebooted 3 ELS10-26 Does Not Respond to NMSELS10-26 Diagnostics and Troubleshooting Physical Appendix a Technical Specifications ELS10-26 SpecificationsConnector Ports ElectricalStandard Support Diagnostic LEDsEnvironmental Regulatory Compliance Address Table Size Management Support Serial Cable PIN AssignmentsConnectors 10BASE-T PIN AssignmentsSTRAIGHT-THROUGH Wiring Pin Assignment aCrossover Wiring 5 4 3 RuleFE-100FX Fepim SpecificationsFE-100TX Cable Type Worst Case Budget Typical Budget Address table AlarmAddress AgentBpdu bridge protocol data unit BackboneBandwidth Bps bits per secondDatagram CongestionData link layer Data rate or speedEncode Full wire speedEncapsulation EntityIeee Intelligent bridge/switchIcmp Internet control message protocol InitializationIP Internet protocol InternetworkingInteroperability ISO International Standards OrganizationMbps megabits per second MAC media access controlMask MIB management information baseOSI Open Systems Interconnection Power budgetPropagation delay PacketProtocol Rarp reverse address resolution protocolService Protocol suiteSynchronous transmission SwitchSymbol Translating bridgeUpstream WAN wide area networkGlossary Index NumericsIndex RIP Wiring crossover A-6 Straight-through A-5