Cabletron Systems SEH100TX-22 manual SEH Overview, SEH Features

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Chapter 2: SEH Features and Options

2.1SEH OVERVIEW

The SEH100TX-22 is a repeating hub providing 22 RJ45 ports and two Ethernet Port Interface Module (EPIM) ports on the front panel for network connections. The SEH has two rear panel Interconnect Bus ports for stackable connections. The front panel EPIM ports support the EPIM-100TX, EPIM-100FX, and the EPIM-100FMB. The SEH100TX-22 is designed to be managed by the Cabletron Systems intelligent stackable hub, the SEHI100TX-22.

The SEH100TX-22 operates in a 100BASE-T Ethernet

!network. This product will NOT operate in a 10BASE-T

CAUTION

environment. Connect the SEH100TX-22 only to similar

 

 

100BASE-T products such as the SEHI100TX-22.

 

The SEH100TX-22 supports the EPIM-100TX, EPIM-100FX,

 

and the EPIM-100FMB. No other Cabletron Systems EPIMs

 

operate in this device.

2.2SEH FEATURES

Repeater Functionality

The SEH fully conforms to the IEEE 802.3u Repeater specifications. The SEH transmits retimed data packets, regenerates the preamble, extends fragments, and arbitrates collisions.

The SEH100TX-22 meets IEEE 802.3u Repeater Class I standards. Class I standards allow one repeater between any two Data Terminal Equipment (DTE) devices within a single collision domain (network).

The SEH 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 SEH automatically reconnects the isolated segment to the network.

Polarity Detection and Correction

Each twisted pair port on the SEH incorporates a Polarity Detection and Correction feature which allows the SEH to pass data regardless of the polarity of the receive link on the twisted pair segment.

2-2

SEH100TX User’s Guide

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Contents 100BASE-T Stackable HUB USER’S Guide Page SEH100TX User’s Guide DOC Notice Cabletron Software Program License Declaration of Conformity Contents Contents Using this Manual Chapter IntroductionDocument Conventions Following conventions are used throughout this documentGetting Help Your email addressRelated Manuals Chapter SEH Features and Options HubSTACK 100BASE-TX HUB with Lanview SEH100TX-22SEH Features SEH OverviewStackable Capabilities Rack Mounting CapabilitiesOptional EPIMs EpimHubSTACK Interconnect Cable Requirements Chapter Installation Requirements SpecificationsCable Specifications UTP Cable Specifications Multimode Fiber Optic Cable Specifications Network Cable Lengths Class I NetworkNetwork Port Specifications RJ45 Network Port PinoutsOperating Specifications Agency ApprovalsPhysical Specifications ImmunitySEH100TX User’s Guide Chapter Installation Unpacking the SEHTabletop or Shelf Installation HubSTACK 100BASE-TX HUB with Lanview SEH100TX-22Rackmount Installation Screws Strain-Relief BracketRack Mounting the SEH Powering UP and Stacking the SEH Powering Up and Stacking the SEHStacking SEH Hubs with an Sehi Repeat steps 3 through 6 until all SEH hubs are connected Installing AN Epim Stacking Unmanaged SEH Hubs TogetherInstalling an Epim SEH100TX User’s Guide Connecting to Network Ports Chapter Connecting to the NetworkConnecting the SEH100TX-22 to the Network Connecting to an EPIM-100TX SEH Network PortsPosition X crossed over RX+ TX+ Position = Not crossed over Nnecting an EPIM-100FX or EPIM-100FMB Testing the Installation EPIM-100FX PortSEH100TX User’s Guide Chapter Troubleshooting Installation TestUsing Lanview SEH100TX-22 Epim 1 RCV LED Epim 2 RCV LED EPIM-100TX Epim SpecificationsAppendix a Epim Information EPIM-100FX EPIM-100FMB Figure A-3 EPIM-100FMBTable A-2 provides the specifications for the EPIM-100FMB Index NumericsIndex-2 SEH100TX User’s Guide Power Supply Cord