Cabletron Systems SEHI100TX manual Position X crossed over RX+ TX+ Position = Not crossed over

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Connecting the SEHI to the Network

Position X (crossed over)

1. RX+	5. NC
2. RX-	6. TX-
3. TX+	7. NC
4. NC	8. NC

Position =

(not crossed over)

1. TX+	5.	NC
2. TX-	6.	RX-
3. RX+	7. NC
4. NC	8. NC		1511_11

Figure 5-2 EPIM-100TX Crossover Switch

Connect an EPIM-100TX to a twisted pair segment as follows:

1.Connect the twisted pair segment to the module by inserting the RJ45 connector on the twisted pair segment into the RJ45 port on the module. See Figure 5-2.

2.Check that the LNK LED on the EPIM-100TX is on. If the LED is off, perform each of the following steps until it is on:

a.Check that the 100BASE-TX device at the other end of the twisted pair segment is powered up.

b.Verify that the RJ45 connector on the twisted pair segment has the proper pinouts.

c.Check the cable for continuity.

d.Check that the twisted pair connection meets dB loss and cable specifications outlined in Chapter 3, Section 3.1.2.

e.Check that the crossover switch is in the correct position.

If a link is not established, contact Cabletron Systems Technical Support.

SEHI100TX User’s Guide

5-3

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Contents Intelligent Stackable HUB USER’S Guide SEHI100TX User’s Guide FCC Notice Cabletron SYSTEMS, INC. Program License Agreement United States Government Restricted Rights Contents Contents SEHI100TX User’s Guide Vii Using this Manual Chapter IntroductionDocument Conventions Following conventions are used throughout this documentGetting Help Related ManualsChapter Sehi Features and Options Sehi OverviewSehi Features Sehi Features and OptionsStackable Capabilities Remote Network Management Rack Mounting CapabilitiesOptional 100BASE-TX and 100BASE-FX EPIMs Cable Specifications Chapter Installation Requirements SpecificationsHubSTACK Interconnect Cable Requirements UTP Cable Speciﬁcations Multimode Speciﬁcations for the EPIM-100FX Network Cable Lengths Network Port Specifications COM Port RequirementsPower Supply Requirements Operating SpecificationsEnvironmental Requirements Physical Specifications Agency ApprovalsChapter Installation Unpacking the SehiPRE-INSTALLATION Checkout Nvram Switch LocationTabletop or Shelf Installation SEHI100TX-22Rackmount Installation Screws Strain-Relief BracketRackmount Installation Installing the Sehi in the Rack Powering UP and Stacking the Sehi Repeat steps 3 through 6 until all SEH hubs are connected Installing the EPIM-100TX or the EPIM-100FX Install an EPIM-100TX or an EPIM-100FX as followsConnecting the Sehi to the Network Chapter Connecting to the NetworkConnecting to Network Ports Connecting a UTP Segment to an EPIM-100TX Sehi Network PortsPosition X crossed over RX+ TX+ Position = Not crossed over Connecting a Fiber Segment to the EPIM-100FX EPIM-100FX PortTesting the Installation Chapter Troubleshooting Installation TestUsing Lanview Using Lanview Using the Reset Button Epim 1 RCV LEDSetting the Nvram Switch Chapter Local Management Local Management Keyboard Conventions Keyboard Conventions FunctionManagement Terminal Setup Console Cable Conﬁguration Management Terminal Setup Parameters Accessing Local Management Sehi Local ManagementFeature Selection Screen Feature Selection ScreenCommunity Name Table Screen Community Name Table ScreenEditing the Community Name Field Configuration Screen ConfigurationDisplays the IP address of the Sehi Setting the IP Address Setting the Subnet MaskSetting the Default Gateway Using the Port Enable OverrideExiting the Conﬁguration Screen Trap Table Screen1 Conﬁguring the Trap Table Exiting the Trap Table ScreenSnmp Tools Screen Snmp Tools ScreenLets you retrieve MIB objects using Snmp protocol Getting Individual OIDs Setting an OIDGetting the Next OID Viewing Multiple OIDs Walking Through OIDsCycling Through OIDs Stepping Through OIDsExiting the Snmp Tools Screen Device Statistics Screen Device Statistics ScreenDisplays the number of errors due to misaligned packets Selecting the Appropriate Module/Port Module Number SequenceUsing the Disable Port Command Using the Enable Port CommandExiting the Device Statistics Screen Epim Specifications Appendix a Epim SpecificationsEPIM-100TX EPIM-100FX Appendix B Image File Download Using Oids Setting UP a Unix Workstation AS a Tftp Server Standard Local Download Table B-1 OIDs and Settings Index NumericsIndex-2 Power Supply Cord