Sehi Features, Repeater Functionality | Cabletron Systems SEHI-34

INTRODUCTION

The SEHI-22/24 and SEHI-32/34 are functionally identical with the exception of the network ports:

•SEHI-22, 12 RJ45 network ports and one EPIM port.

•SEHI-24, 24 RJ45 network ports and two EPIM ports.

•SEHI-32, one 50 pin Champ connector, providing 12 twisted pair segments, and one EPIM port.

•SEHI-34, two 50 pin Champ connectors, providing 24 twisted pair segments, and two EPIM ports.

1.4SEHI FEATURES

Repeater Functionality

The SEHI fully conforms to the IEEE 802.3 Repeater, AUI, and 10BASE-T speciﬁcations, and provides the ﬂexibility to connect networks using IEEE 802.3, Ethernet Version 1 or Version 2 equipment. The SEHI transmits re-timed data packets, regenerates the preamble, extends fragments, and arbitrates collisions.

The SEHI automatically partitions problem segments, and reconnects repaired segments to the network. This feature minimizes the impact on network operation resulting from a problem on one segment by isolating the problem segment. Only devices on the problem segment are affected. When the problem is solved, the SEHI automatically reconnects the isolated segment to the network.

Polarity Detection and Correction

Each twisted pair port on the SEHI incorporates a Polarity Detection and Correction feature that allows the SEHI to pass data regardless of the polarity of the twisted pair segment’s receive link. We do not recommend operating in this condition. If you discover this condition, remove the segment from the network and wire it correctly. This reduces the potential for problems if equipment changes are made.

Flash EEPROMs

The SEHI uses Flash EEPROMs that allow you to download new and updated ﬁrmware using Cabletron’s Remote LANVIEW/Windows, version 2.3 or later or any device using BOOTP or TFTP protocols.

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Cabletron Systems SEHI-34, SEHI-22 Sehi Features, Repeater Functionality, Polarity Detection and Correction, Flash EEPROMs

Contents

10BASE-T Intelligent Stackable HUB USER’S Guide Printed On Recycled Paper DOC Notice FCC Notice Cabletron Software Program License Cabletron SYSTEMS, INC Program License Agreement United States Government Restricted Rights Exclusion of Warranty Disclaimer of Liability Table of Contents Local Management InstallationConnecting to the Network Troubleshooting Contents Appendix B Twisted Pair Wiring Tables A-1 Chapter Introduction Using this Manual Sehi Overview Introduction Getting Help Flash EEPROMs Sehi FeaturesRepeater Functionality Polarity Detection and Correction Stackable Capabilities Reset ButtonLanview LEDs Local Management Epim Introduction Optional Features Related Manuals Daughter Board Upgrade KitRack Mount or Wall Mount Hardware HubSTACK Interconnect Cable Requirements Cable Specifications Jitter LengthInsertion Loss Impedance Noise DelayTemperature Crosstalk Cable Type Attenuation Maximum Cable Length Fiber Optic Budget and Propagation Delay Installation REQUIREMENTS/SPECIFICATIONS Terminators ConnectorsThin-Net Network Requirements for the EPIM-C Module Cable Type AUI Cable Network Port SpecificationsAUI Cable Requirements for the EPIM-A and EPIM-X Modules SEHI-32 and SEHI-34 Network Port Speciﬁcations SEHI-22 and SEHI-24 Network Port Speciﬁcations Pin Champ Connector EPIM-T Installation REQUIREMENTS/SPECIFICATIONS Epim Specifications Parameter Typical Worst Worst Case Typical Value Budget EPIM-F1 and EPIM-F2 EPIM-F3 EPIM-F3 Parameter Typical Minimum Maximum EPIM-C Connector Type EPIM-A and EPIM-X EPIM-A and EPIM-X AUI Port Transceiver Requirements COM Preamble Delay Times Start of PacketsDelay Times JAM General JAM Output Fault ProtectionPower Supply Requirements Output Min. Load Max. Load Max Power Physical Safety Unpacking the Sehi Installing the Sehi Stacking the Sehi Stacking the Sehi Disconnect SEH and Sehi Interconnect Cables At the OUT Port Attaching the Strain Relief Bracket Rack Mounting the Sehi Installing the Sehi in the Rack Wall Mounting the Sehi Shelf or Table-top Installation Free-Standing Installation Installation Connecting the Sehi to the Power Source Connecting to Network Ports, SEHI-22 and SEHI-24 Connecting the Sehi to the Network EPIM-2 Connecting to Network Ports, SEHI-32 and SEHI-34 EPIM-T Cross-over Switch Connecting a UTP Segment to an EPIM-T Connecting to the Network Connecting to the Network Connecting to the Network Connecting a Thin-Net Segment to an EPIM-C EPIM-C EPIM-A Connecting an AUI Cable to an EPIM-A Connecting an AUI Cable to an EPIM-X On Position Toward Back Epim OFF Position Toward Front Finishing the Installation Installation CHECK-OUT Chapter Troubleshooting Using Lanview CPU PWR LNK Troubleshooting CLNUsing the Reset Button RCV Chapter Local Management Local Management Management Terminal Requirements Management Terminal Connection Console Cable Conﬁguration Setup Management Terminal Setup ParametersMenu Function Selection Display Setup General Setup Sehi Local Management Local Management Accessing Local Management Feature Selection Screen Community Name Table Screen Local Management Using the Local Management Screens Community Name Access Editing the Community Name Field IP Address Conﬁguration Screen SubNet Mask Default GatewayPort Enable Override Setting the IP Address Setting the Subnet Mask Using the Port Enable Override Setting the Default Gateway Trap Table Screen Exiting the Configuration Screen Trap IP Address Configuring the Trap TableSnmp Community Name Traps Snmp Tools Screen Exiting the Trap Table Screen Get Next OID PrependGet Set Cycles WalkRecall-OID Step Getting the Next OID Getting Individual OIDs Viewing Multiple OIDs Setting an OID Cycling Through OIDs Walking Through OIDsStepping Through OIDs Device Statistics Screen Exiting the Snmp Tools Screen Port Admin. Status Errors ReceivedCRC Errors Alignment Errors Port Seg. Status Enable PortDisable Port Update-Freq Selecting the Appropriate Module/Port Using the Enable Port Command Exiting the Device Statistics Screen Using the Disable Port Command Twisted Pair Wiring Tables Appendix a Twisted Pair Wiring Tables A-2 A-3 A-4 Drop Device From Punch Down To RJ-45 Into Block Wallplate Ofﬁce10BASE-T A-6 A-7 Champ Down Block If Required Ethernet Device SEHI-32/34 Punch Wall Plate Figure A-1. Punch Down Block A-9 French Power Supply CordGerman Spanish