Cabletron Systems SEH100TX-22 User Manual

SEH100TX-22

100BASE-T STACKABLE HUB

USER’S GUIDE

®

Only qualified personnel should perform installation
procedures.

NOTICE

Cabletron Systems reserves the right to make changes in specifications and other information
contained in this document without prior notice. The reader should in all cases consult Cabletron
Systems to determine whether any such changes have been made.

The hardware, firmware, or software described in this manual is subject to change without notice.
IN NO EVENT SHALL CABLETRON SYSTEMS BE LIABLE FOR ANY INCIDENTAL,

INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES WHATSOEVER (INCLUDING BUT
NOT LIMITED TO LOST PROFITS) ARISING OUT OF OR RELATED TO THIS MANUAL OR
THE INFORMATION CONTAINED IN IT, EVEN IF CABLETRON SYSTEMS HAS BEEN
ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE POSSIBILITY OF SUCH
DAMAGES.



Copyright 1996 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America

Order Number: 9031510-02 December 1996

SPECTRUM, LANVIEW
EPIM-100FX, EPIM-100TX, EPIM-100FMB, HubSTACK, MicroMMAC, SEH

trademarks of Cabletron Systems, Inc.
All other product names mentioned in this manual may be trademarks or registered trademarks of

their respective companies.

and

BRIM

are registered trademarks and

Element Manager, EPIM

, and

SEHI

,
are

FCC NOTICE

This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.

NOTE:

This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial environment.
This equipment uses, generates, and can radiate radio frequency energy and if not installed in
accordance with the operator’s manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause interference in which case the user
will be required to correct the interference at his own expense.

WARNING:

party responsible for compliance could void the user’s authority to operate the equipment.

Changes or modifications made to this device which are not e xpressly appro v ed by the

Printed on Recycled Paper

SEH100TX User’s Guide i

Notice

DOC NOTICE

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital
apparatus set out in the Radio Interference Regulations of the Canadian Department of
Communications.

Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables
aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique
édicté par le ministère des Communications du Canada.

VCCI NOTICE

This equipment is in the 1st Class Category (information equipment to be used in commercial and/or
industrial areas) and conforms to the standards set by the Voluntary Control Council for Interference
by Information T echnology Equipment (VCCI) aimed at preventing radio interference in commercial
and/or industrial areas.

Consequently, when used in a residential area or in an adjacent area thereto, radio interference may be
caused to radios and TV receivers, etc.

Read the instructions for correct handling.

CABLETRON SYSTEMS, INC. PROGRAM LICENSE AGREEMENT

IMPORTANT:

This document is an agreement between you, the end user, and Cabletron Systems, Inc. (“Cabletron”)
that sets forth your rights and obligations with respect to the Cabletron software program (the
“Program”) contained in this package. The Program may be contained in firmware, chips or other
media. BY UTILIZING THE ENCLOSED PRODUCT, YOU ARE AGREEING TO BECOME
BOUND BY THE TERMS OF THIS AGREEMENT, WHICH INCLUDES THE LICENSE AND
THE LIMITATION OF WARRANTY AND DISCLAIMER OF LIABILITY. IF YOU DO NOT
AGREE TO THE TERMS OF THIS AGREEMENT , PR OMPTLY RETURN THE UNUSED
PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.

Before utilizing this product, carefully read this License Agreement.

ii SEH100TX User’s Guide

Notice

CABLETRON SOFTWARE PROGRAM LICENSE

1. LICENSE

package subject to the terms and conditions of this License Agreement.
You may not copy, reproduce or transmit any part of the Program except as permitted by the

Copyright Act of the United States or as authorized in writing by Cabletron.

2. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the

Program.

3. APPLICABLE LA W. This License Agreement shall be interpreted and governed under the laws

and in the state and federal courts of New Hampshire. You accept the personal jurisdiction and
venue of the New Hampshire courts.

. You have the right to use only the one (1) copy of the Program provided in this

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF

writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including
its documentation and media).

CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO
YOU BY CABLETRON IN WRITING, EITHER EXPRESSED OR IMPLIED, INCLUDING
BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE, WITH RESPECT TO THE PROGRAM, THE
ACCOMP ANYING WRITTEN MA TERIALS, AND ANY A CCOMP ANYING HARDWARE.

2. NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL

CABLETRON OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
(INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS,
PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, SPECIAL,
INCIDENTAL, CONSEQUENTIAL, OR RELIANCE DAMAGES, OR OTHER LOSS)
ARISING OUT OF THE USE OR INABILITY TO USE THIS CABLETRON PRODUCT,
EVEN IF CABLETRON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES. BECAUSE SOME STATES DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR
ON THE DURATION OR LIMITATION OF IMPLIED WARRANTIES, IN SOME
INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO
YOU.

WARRANTY. Except as may be specifically provided by Cabletron in

UNITED STATES GOVERNMENT RESTRICTED RIGHTS

The enclosed product (a) was developed solely at private expense; (b) contains “restricted computer
software” submitted with restricted rights in accordance with Section 52227-19 (a) through (d) of the
Commercial Computer Software - Restricted Rights Clause and its successors, and (c) in all respects
is proprietary data belonging to Cabletron and/or its suppliers.

For Department of Defense units, the product is licensed with “Restricted Rights” as defined in the
DoD Supplement to the Federal Acquisition Regulations, Section 52.227-7013 (c) (1) (ii) and its
successors, and use, duplication, disclosure by the Government is subject to restrictions as set forth in
subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at

252.227-7013. Cabletron Systems, Inc., 35 Industrial Way, Rochester, New Hampshire 03867-0505.

SEH100TX User’s Guide iii

Notice

DECLARATION OF CONFORMITY

Application of Council Directive(s):

Manufacturer’s Name:

Manufacturer’s Address:

European Representative Name:

European Representative Address:

Conformance to Directive(s)/Product Standards:

Equipment T ype/Environment:

W e the undersigned, hereby declare, under our sole responsibility, that the equipment packaged
with this notice conforms to the above directives.

Manufacturer Legal Representative in Europe

89/336/EEC
73/23/EEC

Cabletron Systems, Inc.
35 Industrial Way

PO Box 5005
Rochester, NH 03867

Mr. J. Solari
Cabletron Systems Limited

Nexus House, Newbury Business Park
London Road, Newbury
Berkshire RG13 2PZ, England

EC Directive 89/336/EEC
EC Directive 73/23/EEC
EN 55022
EN 50082-1
EN 60950

Networking Equipment, for use in a
Commercial or Light
Environment.

Industrial

Mr. Ronald Fotino Mr. J. Solari

___________________________________ ___________________________________

Full Name Full Name
Principal Compliance Engineer Managing Director - E.M.E.A.

___________________________________ ___________________________________

Title Title
Rochester, NH, USA Newbury, Berkshire, England

___________________________________ ___________________________________

Location Location

iv SEH100TX User’s Guide

CONTENTS

CHAPTER 1 INTRODUCTION

1.1 Using This Manual.......................................................................1-1

1.2 Document Conventions...............................................................1-2

1.3 Getting Help.................................................................................1-3

1.4 Related Manuals..........................................................................1-4

CHAPTER 2 SEH FEATURES AND OPTIONS

2.1 SEH Overview.............................................................................2-2

2.2 SEH Features.............................................................................. 2-2

2.3 Stackable Capabilities.................................................................2-3

2.4 Rack Mounting Capabilities......................................................... 2-3

2.5 Optional EPIMs............................................................................2-4

CHAPTER 3 INSTALLATION REQUIREMENTS

AND SPECIFICATIONS

3.1 Cable Specifications.................................................................... 3-1

3.1.1 HubSTACK Interconnect Cable Requirements............... 3-1

3.1.2 UTP Cable Specifications...............................................3-2

3.1.3 Multimode Fiber Optic Cable Specifications...................3-3

3.2 Network Cable Lengths...............................................................3-4

3.3 Network Port Specifications.........................................................3-5

3.4 Operating Specifications..............................................................3-6

3.4.1 Power Supply Requirements .......................................... 3-6

3.4.2 Environmental Requirements .........................................3-6

3.5 Agency Approvals........................................................................3-6

3.5.1 Safety.............................................................................. 3-6

3.5.2 Emission ......................................................................... 3-6

3.5.3 Immunity ......................................................................... 3-7

3.6 Physical Specifications................................................................ 3-7

SEH100TX User’s Guide v

Contents

CHAPTER 4 INSTALLATION

4.1 Unpacking the SEH......................................................................4-1

4.2 Tabletop or Shelf Installation .......................................................4-2

4.3 Rackmount Installation.................................................................4-3

4.4 Powering Up and Stacking the SEH............................................4-5

4.4.1 Stacking SEH Hubs with an SEHI...................................4-6

4.4.2 Stacking Unmanaged SEH Hubs Together.....................4-8

4.5 Installing an EPIM........................................................................4-8

CHAPTER 5 CONNECTING TO THE NETWORK

5.1 Connecting the SEH100TX-22 to the Network ............................5-1

5.1.1 Connecting to Network Ports...........................................5-1

5.1.2 Connecting to an EPIM-100TX........................................5-2

5.1.3 nnecting an EPIM-100FX or EPIM-100FMB ...................5-4

5.2 Testing the Installation.................................................................5-5

CHAPTER 6 TROUBLESHOOTING

6.1 Installation Test............................................................................6-1

6.2 Using LANVIEW...........................................................................6-2

APPENDIX A EPIM INFORMATION

A.1 EPIM Specifications....................................................................A-1

A.1.1 EPIM-100TX................................................................... A-1

A.1.2 EPIM-100FX................................................................... A-2

A.1.3 EPIM-100FMB................................................................ A-3

INDEX

vi SEH100TX User’s Guide

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

Stackable Hub User’s Guide

SEH100TX-22 100BASE-T

. This manual provides installation
instructions, troubleshooting and reference information for the
SEH100TX-22.

NOTE

The terms SEH (Stackable Ethernet Hub) and SEHI (Stackable
Ethernet Hub with Intelligence) are used throughout this
manual when referring to the SEH100TX-22 and the
SEHI100TX-22, respectively.

1.1 USING THIS MANUAL

Read through this manual to gain an understanding of the features and
capabilities of the SEH. A general knowledge of Ethernet and IEEE

802.3u type data communications networks and their physical layer
components is helpful when installing the SEH.

Chapter 1,

Introduction

objectives and conventions of this manual. This chapter also provides
information about how to get help and concludes with a list of related
manuals.

Chapter 2,

SEH Features and Options

and provides information about available options.

, outlines the contents and describes the

, briefly describes SEH features

Chapter 3,

Installation Requirements and Specifications

, provides

installation requirements, network guidelines, and SEH specifications.
Chapter 4,

Installation

, contains instructions for installing the SEH as a

stackable or standalone hub.
Chapter 5,

Connecting to the Network

, explains how to connect the SEH

to the network using the various media types.
Chapter 6,

Troubleshooting

, describes how to use the LANVIEW LEDs

to troubleshoot network problems.
Appendix A,

EPIM Information,

provides specifications, cabling

information, and switch settings for the Ethernet Port Interface Modules.

SEH100TX User’s Guide 1-1

Chapter 1:

Introduction

1.2 DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

Note

NOTE

TIP

symbol. Calls the reader’s attention to any item of

information that may be of special importance.

Tip

symbol. Conveys helpful hints concerning procedures or

actions.

!

CAUTION

Caution

damage to the equipment.

Electrical Hazard Warning

that could result in personal injury or death due to an electrical
hazard.

symbol. Contains information essential to avoid

symbol. Warns against an action

1-2 SEH100TX User’s Guide

Getting Help

1.3 GETTING HELP

If you need additional support related to this device, or if you have any
questions, comments, or suggestions concerning this manual, contact
Cabletron Systems Technical Support:

Phone [phone]

Monday – Friday; 8 A.M. – 8 P.M. Eastern Time
CompuServe GO CTRON from any ! prompt
Internet mail [e-mail]
FTP ctron.com (134.141.197.25)

Login
Password

BBS [phone]

Modem setting 8N1: 8 data bits, 1 stop bit, No parity

For additional information about Cabletron Systems products, visit our
W orld W ide Web site: http://www .cabletron.com/

Before calling Cabletron Systems Technical Support, have the following
information ready:

anonymous

your email address

• A description of the failure

• A description of any action(s) already taken to resolve the problem
(e.g., changing mode switches, rebooting the unit, etc.)

• A description of your network environment (layout, cable type, etc.)

• Network load and frame size at the time of trouble (if known)

• The serial and revision numbers of all Cabletron Systems products in
the network

• The device history (i.e., have you returned the device before, is this a
recurring problem, etc.)

• Any previous Return Material Authorization (RMA) numbers

SEH100TX User’s Guide 1-3

Chapter 1:

Introduction

1.4 RELATED MANUALS

Use the Cabletron Systems

Stackable Hub User’s Guide

technical data provided in this manual. The procedures contained in the

SEHI100TX-22 100BASE-T Intelligent Stackable Hub User’s Guide are

referenced where appropriate, but not repeated in this manual.

SEHI100TX-22 100BASE-T Intelligent

to supplement the procedures and other

1-4 SEH100TX User’s Guide

CHAPTER 2

SEH FEATURES AND OPTIONS

This chapter provides an overview of the SEH (Figure 2-1) and contains
sections detailing the features and available options.

NOTE

(Stackable Ethernet Hub with Intelligence) are used throughout
this manual when referring to the SEH100TX-22 and the
SEHI100TX-22, respectively.

HubSTACK 100BASE-TX HUB WITH LANVIEW®
SEH100TX-22

PWR
MGMT
CLN

SEH100TX-22 100BASE-T HUB WITH LANVIEW®

SN

Power Supply

Figure 2-1 Front and Rear Views of the SEH100TX-22

The abbreviations SEH (Stackable Ethernet Hub) and SEHI

RCV
LNK

22 21 20 19 18 17 16 15 14 13 12

RCV
LNK

11 10 9 8 7 6 5 4 3 2 1

Port Status LEDs
System LEDs

REAR VIEW

E
2

22X 21X 20X 19X 18X 17X

E
1

11X 10X 9X 8X 7X 6X

Interconnect Bus "OUT" Port

Interconnect Bus "IN" Port

16X 15X 14X 13X 12X

5X 4X 3X 2X 1X

Network Ports 1-22

EPIM Slots

EPIM 2

EPIM 1

OUT

SEH100TX INTERCONNECT

IN

1510_01

SEH100TX User’s Guide 2-1

Chapter 2:

SEH Features and Options

2.1 SEH 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.

2.2 SEH 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

Stackable Capabilities

LANVIEW LEDs

Cabletron Systems LANVIEW status monitoring and diagnostics system
is a troubleshooting tool that helps in diagnosing power failures,
collisions, cable faults, and link problems. The LANVIEW LEDs are
conveniently located on the SEH front panel.

2.3 STACKABLE CAPABILITIES

The SEH100TX-22 is a non-intelligent hub designed to be managed by
the Cabletron Systems SEHI100TX-22 intelligent hub. The design of the
SEH allows the stacking of five SEH hubs in an unmanaged configuration
or up to four Cabletron Systems SEH non-intelligent hubs with one SEHI.
The SEHI is placed at the bottom of the stack. It manages all SEH hubs in
the stack and provides full packet and error statistics for the entire stack,
individual devices, or individual ports.

SEH non-intelligent hubs may be stacked together or with one SEHI
using Cabletron Systems HubSTACK Interconnect cables provided with
the SEH. Stackable configurations make it possible to maintain only one
IEEE repeater hop while providing up to 120 ports. The design allows
hubs to be added or removed from a stack without having to power down
the entire stack.

2.4 RACK MOUNTING CAPABILITIES

The SEH can be installed in a 19-inch rack. Cabletron Systems provides
the necessary brackets and mounting screws for the SEH. Refer to
Chapter 4,

SEH100TX User’s Guide 2-3

Installation

, for complete rack mounting instructions.

Chapter 2:

SEH Features and Options

2.5 OPTIONAL EPIMs

EPIMs are not included with the SEH, but they can be purchased
separately from Cabletron Systems.

EPIMs enable the expansion of a network through different types of
media. Cabletron Systems offers three optional EPIMs for the
SEH100TX-22 and SEHI100TX-22 as shown in Table 2-1

Table 2-1 100BASE-TX/FX/FMB EPIMs

EPIM Media Type Connector

EPIM-100TX

EPIM-100FX Multimode Fiber Optic Cable SC
EPIM-100FMB for

buffered uplinks

Category 5 Unshielded Twisted
Pair Cable

Multimode Fiber Optic Cable SC

For more details about the EPIMs, refer to Appendix A.

RJ45

2-4 SEH100TX User’s Guide

CHAPTER 3

INSTALLATION REQUIREMENTS

AND SPECIFICATIONS

This chapter describes cabling requirements, network guidelines, and
operating specifications for the SEH100TX-22.

The network must meet the requirements and conditions
specified in this chapter to obtain satisfactory performance from

!

CAUTION

3.1 CABLE SPECIFICATIONS

The front panel SEH100TX-22 network ports support Category 5
Unshielded Twisted Pair (UTP) cabling. Ethernet Port Interface Modules
(EPIMs) expand the network using UTP (EPIM-100TX) or multimode
fiber optic (EPIM-100FX or EPIM-100FMB) cabling. For information
concerning the two EPIM types, refer to Appendix A. The rear panel
Interconnect Bus ports support Cabletron Systems Interconnect cables for
stackable applications.

this equipment. Failure to follow these guidelines could result in
poor network performance.

T ak e care in planning and preparing the network cabling and connections.
The quality of the connections and the length of cables are critical factors
in determining the reliability of the network. The following sections
provide the specifications for each media type.

3.1.1 HubSTACK Interconnect Cable Requirements

Connect units in the stack together with the HubSTACK Interconnect
cables shipped with the SEH module and available only from Cabletron
Systems (P/N 9380209). The cables attach to the SEH100TX-22 rear
panel bus ports.

The rear panel of the SEH has an Interconnect Bus Out port and an
Interconnect Bus In port to stack hubs together. The bus supports five
stackable devices. Stack up to five SEH hubs together or stack up to four
SEH hubs together with one SEHI100TX-22.

SEH100TX User’s Guide 3-1

Chapter 3:

Installation Requirements and Specifications

3.1.2 UTP Cable Specifications

The device at the other end of the twisted pair segment must meet IEEE

802.3u 100BASE-T specifications. When connecting a 100BASE-TX
twisted pair segment to the SEH twisted pair network ports and the
EPIM-100TX module, the network must meet the following
requirements:

Length

The IEEE 802.3u 100BASE-T standard requires that 100BASE-TX
devices have the ability to transmit over a 100 meter (328 foot) link using
Category 5 UTP wire. The cable used must meet the Horizontal
requirements and 90-meter length limitations. Patch cable should be used
on each end of the Horizontal wire to make connections to punch down
blocks, panels, or other connecting devices. The combined lengths of the
patch cords must not exceed 10 meters so the total segment length
including the patch cords does not exceed 100 meters (328 feet).

Category 5 cables are marked on the cable jacket as Cat 5, Category 5,
Level 5, Level V, or an equivalent.

Impedance

UTP cables typically have an impedance of between 85 and 110 ohms.

Jitter

Intersymbol interference and reflections cause jitter in the bit cell timing,
resulting in data errors. A 100BASE-TX link must not generate more than

1.4 ns of jitter. If the cable meets the impedance requirements for a
100BASE-TX link, jitter should not be a concern.

Crosstalk

Crosstalk is caused by signal coupling between the different cable pairs
contained within a multi-pair cable bundle. 100BASE-TX transcei vers are
designed so that the user does not need to be concerned about cable
crosstalk, provided the cable meets all other requirements.

Noise

Noise is caused by either crosstalk or externally induced impulses.
Impulse noise may cause data errors if the impulses occur at very specific
times during data transmission. Generally , the user need not be concerned
about noise. If noise-related data errors are suspected, it may be necessary
to either reroute the cable or eliminate the source of the impulse noise.

3-2 SEH100TX User’s Guide

Cable Specifications

Propagation Delay

Propagation delay is the amount of time it takes data to travel from the
sending device to the receiving device. Total propagation delay allowed
for the network is 256 bit times (2.56 µs) in one direction (5.12 µs round
trip). If the total propagation delay between any two nodes on the network
exceeds 2.56 µs, then use bridges or other devices to further segment the
network.

Temperature

The attenuation of PVC insulated cable varies significantly with
temperature. At temperatures greater than 40°C (104°F), Cabletron
Systems recommends the use of plenum-rated cables to ensure that cable
attenuation remains within specification.

3.1.3 Multimode Fiber Optic Cable Specifications

The SEH supports the Cabletron Systems EPIM-100FX and
EPIM-100FMB. These EPIMs meet IEEE 802.3u standards. When
connecting a fiber optic segment to the SEH EPIM-100FX or
EPIM-100FMB module, the network must meet the following
requirements:

Cable Loss

T est the fiber optic cable with a fiber optic attenuation test set adjusted for
an 850 nm wavelength. This test verifies that the signal loss in a cable is
within an acceptable level. The maximum loss for a multimode fiber optic
cable is 11.0 dB.

Fiber Optic Budget and Propagation Delay

Determine the maximum fiber optic cable length by calculating the fiber
optic budget delay and total network propagation before fiber optic cable
runs are incorporated in any network design.

Fiber optic budget is the combination of the optical loss due to the fiber
optic cable, in-line splices, and fiber optic connectors.

Propagation delay (collision delay) is the amount of time it takes data to
travel from the sending device to the receiving device. Total propagation
delay allowed for the entire network is 256 bit times (2.56 µs) in one
direction (5.12 µs round trip). If the total propagation delay between any
two nodes on the network exceeds 2.56 µs, then use bridges or other
devices to further segment the network.

SEH100TX User’s Guide 3-3

Chapter 3: Installation Requirements and Specifications

3.2 NETWORK CABLE LENGTHS

This section details the maximum network cable lengths specified by the
IEEE 802.3u standard for a Class I repeater. As stated previously, the
physical size of the network is limited primarily by propagation delay.
The round trip delay cannot exceed 512 bit times or 5.12 µs.

NOTE

A stack of five SEH hubs or four SEH hubs and one SEHI hub
is equivalent to one repeater.

A 100BASE-T network might use all UTP links, all fiber links, or a
combination of both. Figure 3-1 shows a simplified example of a network
with one Class I repeater. Link segments A and B represent the longest
links in the network. In this case, if both segment A and segment B are
UTP, each segment may be up to 100 meters long for a maximum network
length of 200 meters. If segment A is UTP and segment B is fiber optic,
the maximum length of the network is 263 meters (with a maximum UTP
segment length of 100 meters). If both segments A and B are multimode
fiber optic, the maximum length is 274 meters.

If a buffered uplink (EPIM-100FMB) is used, the collision domain is
stopped at the EPIM slot. This allows a full length fiber optic link of 400
meters to be used as an uplink while maintaining 100-meter UTP and
400-meter fiber optic lengths to desktops. So if segment A, shown in
Figure 3-1, is UTP and segment B is fiber optic, the maximum length of
the network is 500 meters. If both segments are fiber optic, the maximum
length is 800 meters.

SEH100TX-22

A

DTE

Figure 3-1 Class I Network

3-4 SEH100TX User’s Guide

B

DTE

Network Port Specifications

Table 3-1 summarizes the maximum segment lengths for the type and
combination of cables used with a Class I repeater.

The maximum length of an individual UTP segment may be no
more than 100 meters for proper operation.

!

CAUTION

Table 3-1 Maximum Class I Network Cable Length

Number
of
Repeaters

1 200 m 263 m 274 m 500 m 800 m

UTP

UTP &
Multimode
Fiber Optics

Multimode
Fiber
Optics

UTP &
Buffered
EPIM

Fiber
Optics&
Buffered
EPIM

3.3 NETWORK PORT SPECIFICATIONS

The SEH network ports use shielded RJ45 connectors that support UTP
cabling. Figure 3-2 shows the RJ45 pinouts.

1 2 3 4 5 6 7 8

11X

10X

1. Receive + 5. Not Used

2. Receive - 6. Transmit -

3. Transmit + 7. Not Used

4. Not Used 8. Not Used

9X

09162_02

Figure 3-2 RJ45 Network Port Pinouts

SEH100TX User’s Guide 3-5

Chapter 3: Installation Requirements and Specifications

3.4 OPERATING SPECIFICATIONS

This section details power supply and environmental requirements.

3.4.1 Power Supply Requirements

The SEH has a universal po wer supply. The input power requirements are
listed in Table 3-2.

Table 3-2 Power Requirements

Line Input Range Current Frequency

100–125 Vac 4.0 A
200–250 Vac 2.0 A

50/60 Hz

3.4.2 Environmental Requirements

The environmental requirements for the SEH are detailed in this section.
Operating T emperature: 5°C to 40°C (41°F to 104°F)
Storage T emperature: -30°C to 73°C (-22°F to 164°F)
Operating Humidity: 15% to 95% (non-condensing)

3.5 AGENCY APPROVALS

The safety , emission, and immunity approvals for the SEH are detailed in
this section.

3.5.1 Safety

This unit meets the requirements of UL 1950, CSA C22.2 No. 950, IEC
950, and EN 60950.

3.5.2 Emission

This unit is compliant with the requirements of FCC Part 15 Class A,
EN 55022 Class A, and VCCI Class I.

3-6 SEH100TX User’s Guide

Physical Specifications

3.5.3 Immunity

This unit meets the requirements of EN 50082-1 including
IEC 801-2 (ESD), IEC 801-3 (Radiated Susceptibility),
and IEC 801-4 (EFT/B).

3.6 PHYSICAL SPECIFICATIONS

This section details the physical specifications for the SEH.
Dimensions (H x W x D): 2.8 in x 17.0 in x 13.5 in

(7.2 cm x 43.6 cm x 34.6 cm)

Weight: 7 lb (3.15 kg)

SEH100TX User’s Guide 3-7

Chapter 3: Installation Requirements and Specifications

3-8 SEH100TX User’s Guide

CHAPTER 4

INSTALLATION

This chapter outlines the procedure for attaching the SEH to the network
as a stackable or standalone device. Ensure that the network meets the
guidelines and requirements outlined in Chapter 3, Installation
Requirements and Specifications, before installing the SEH.

NOTE

A single phase grounded power receptacle that meets the
power supply requirements listed in Chapter 3 must be located
within seven feet of the installation.

Failure to follow installation instructions may result in damage
to the equipment or electrical shock hazard.

This chapter covers the following topics:

• Unpacking the SEH (Section 4.1)

• Installing the SEH in a tabletop configuration (Section 4.2)

• Rack Mounting the SEH (Section 4.3)

• Powering Up and Stacking the SEH (Section 4.4)

• Installing Optional EPIMs (Section 4.5)

4.1 UNPACKING THE SEH

Unpack the SEH as follows:

1. Remove the shipping material covering the SEH in the shipping box.

2. Carefully remove the SEH from the shipping box and set it aside to
prevent damage.

3. Visually inspect the SEH. If there are any signs of damage, contact
Cabletron Systems Technical Support immediately. Refer to
Section 1.3, Getting Help, for instructions.

SEH100TX User’s Guide 4-1

Chapter 4: Installation

The SEH may be installed on a tabletop or shelf, or in a 19-inch rack, and
configured as a standalone or stacked hub.

Go to Section 4.2 to install an SEH on a table or shelf. Go to Section 4.3
to install the SEH in a rack.

4.2 TABLETOP OR SHELF INSTALLATION

This section provides guidelines for installation on a tabletop or shelf.
Tabletop and shelf installations must be within reach of the network

cabling and meet the requirements listed below:

• In a shelf installation, the shelf must be able to support 30 pounds of
static weight for each device in the stack.

• Maintain a temperature of between 5°C (41°F) and 40°C (104°F) at
the installation site with fluctuations of less than 10°C per hour.

The SEH must be located within seven feet of its power source and with
an unrestricted free surface area as shown in Figure 4-1.

In order to allow for proper cooling, there must be a two-inch
clearance on either side and the back of the unit.

!

CAUTION

E
2

22X 21X 20X 19X 18X 17X

E
1

11X 10X 9X 8X 7X 6X

C

16X 15X 14X 13X 12X

5X 4X 3X 2X 1X

EPIM 2

EPIM 1

D

B

HubSTACK
SEH

A

A = 15.24 cm (6 in)

100TX-

100BASE-TX HUB

22

WITH

PWR
MGMT
CLN

LANVIEW®

RCV
LNK

22 21 20 19 18 17 16 15 14 13 12

RCV
LNK

11 10 9 8 7 6 5 4 3 2 1

B = 45.72 cm (18 in)
C = 53.34 cm (21 in)
D = 213.36 cm (7 ft)

1510_13

Figure 4-1 Tabletop or Shelf Installation

Proceed to Section 4.4, Powering Up and Stacking the SEH.

4-2 SEH100TX User’s Guide

Rackmount Installation

4.3 RACKMOUNT INSTALLATION

To install the SEH in a 19-inch rack, Cabletron Systems provides an
accessory kit with the SEH that includes rack mounting brackets,
mounting screws, and a strain-relief bracket for cable management.

Rack mounting the SEH involves the following:

• Attaching the strain-relief bracket

• Rack mounting the SEH

• Stacking the SEH when applicable

Attaching the Strain-Relief Bracket

Attach the strain-relief bracket to the front of the SEH as follows:

1. Locate the strain-relief bracket and four 8-32 x 3/8-inch pan-head

screws from the rackmount kit.

Do NOT attempt to attach the strain-relief bracket with screws
other than the 8-32 x 3/8-inch screws included with the SEH.
Use of longer screws may damage the unit or cause
electrical shock.

2. Attach the strain-relief bracket to the bottom of the SEH (Figure 4-2).

Screws (4)

Strain-Relief Bracket

EPIM 1

EPIM 2

5X 4X 3X 2X 1X

16X 15X 14X 13X 12X

Figure 4-2 Attaching the Strain-Relief Bracket

SEH100TX User’s Guide 4-3

11X 10X 9X 8X 7X 6X

1
E

22X 21X 20X 19X 18X 17X

2
E

11 10 9 8 7 6 5 4 3 2 1

CLN

LNK
RCV

MGMT
PWR

22 21 20 19 18 17 16 15 14 13 12

LNK
RCV

WITH

LANVIEW®

100TX-

22

100BASE-TX HUB

1510_12

SEH
HubSTACK

Chapter 4: Installation

Rack Mounting the SEH

Refer to Figure 4-3 and proceed as follows to install the SEH into a
19-inch rack.

1. Remove the four cover screws (two from each side) located along the
front edges of each side of the SEH.

Do not remove the cover from the SEH. Do not remove any
other screws from the unit.

2. Using the four 6-32 x 3/8-inch replacement flathead cover screws
provided in the rackmount kit, attach the rack mounting brackets to
each side of the SEH.

Rack Mounting

Brackets (2)

HubSTACK
SEH

100TX-

100BASE-TX HUB

22

WITH

PWR
MGMT

CLN

LANVIEW®

RCV
LNK

22 21 20 19 18 17 16 15 14 13 12

RCV
LNK

11 10 9 8 7 6 5 4 3 2 1

E
2

22X 21X 20X 19X 18X 17X

E
1

11X 10X 9X 8X 7X 6X

16X 15X 14X 13X 12X

5X 4X 3X 2X 1X

EPIM 2

EPIM 1

1510_05

Screws (4)

Figure 4-3 Installing the Rack Mounting Brackets

The cooling fans at the rear panel of the SEH must have

CAUTION

rear) for unrestricted air flow. The temperature for the selected

adequate clearance (two inches on either side and in the

!

location must be maintained between 5°C and 40°C, and
fluctuate less than 10°C per hour.

3. Ensure that the rack used will support the unit, and that the rack will
remain stable with the unit installed in it. Support the SEH securely
from underneath, and align the mounting brackets of the SEH chassis
with the screw holes in the equipment rack as shown in Figure 4-4.
Fasten the SEH to the equipment rack securely.

4-4 SEH100TX User’s Guide

Powering Up and Stacking the SEH

19-Inch Rack

HubSTACK
SEH

100TX-

100BASE-TX HUB

22

WITH

PWR
MGMT
CLN

LANVIEW®

RCV
LNK

22 21 20 19 18 17 16 15 14 13 12

RCV
LNK

11 10 9 8 7 6 5 4 3 2 1

E
2

22X 21X 20X 19X 18X 17X

E
1

11X 10X 9X 8X 7X 6X

16X 15X 14X 13X 12X

5X 4X 3X 2X 1X

EPIM 2

EPIM 1

Screws (4)

1510_06

Figure 4-4 Installing the SEH in the Rack

Proceed to Section 4.4, Powering Up and Stacking the SEH.

4.4 POWERING UP AND STACKING THE SEH

The following section details the procedures that must be followed to
power up and interconnect stacked hubs.

Failure to follow this procedure may result in damage to the
equipment.

!

CAUTION

If you are using an intelligent hub (SEHI) to manage the stack,
you must locate the SEHI at the bottom of the stack.

!

CAUTION

The SEHI must be completely powered up and initialized
before powering up and interconnecting the rest of the stack.

If you are using an SEHI to manage the SEH stack, proceed to
Section 4.4.1. If you are not using an SEHI to manage the SEH stack,
proceed to Section 4.4.2.

SEH100TX User’s Guide 4-5

Chapter 4: Installation

4.4.1 Stacking SEH Hubs with an SEHI

Follow the procedures in this section if you are using an SEHI to manage
an SEH stack:

NOTE

The SEH and the SEHI have universal power supplies that
allow connection to power sources from 100 Vac to 125 Vac
@ 4.0 A or 200 Vac to 250 Vac @ 2.0 A, 50/60 Hz.

1. Power up the SEHI by plugging the power cord into the back panel of
the SEHI and plugging the other end into a grounded receptacle.

NOTE

Locate the SEHI at the bottom of the stack.
For management purposes, stacked hubs are always

numbered from 1 to 5 starting at the bottom.

2. Verify that the PWR LED is on, indicating that the SEHI is receiving
power. After the SEHI runs a self test and completes the boot process
successfully, the CPU LED blinks green indicating normal operation.
If the LED remains red, the processor is faulty; contact Cabletron
Systems Technical Support. Do not proceed with the following steps
until the CPU LED is a steady blinking green.

Do NOT power up or interconnect any other hubs in the stack
until the SEHI has successfully completed the boot process.

!

CAUTION

Also, do NO T connect the interconnect cab le between the SEH
and the SEHI before powering up the SEH. Otherwise, damage
to the SEH may result.

3. Power up the SEH above the SEHI in the stack by plugging the power
cord into the back panel of the SEH and plugging the other end into a
grounded receptacle.

4. Verify that the PWR LED is on, indicating that the SEH is receiving
power.

4-6 SEH100TX User’s Guide

Powering Up and Stacking the SEH

5. Attach the interconnect cable to the “IN” port on the rear panel of the

SEH as shown in Figure 4-5.

REAR VIEW
SEHI Managing 4 SEH Non-Intelligent Hubs

SEH100TX-22 100BASE-TX HUB WITH LANVIEW®

OUT

SEH100TX INTERCONNECT

IN

SEH100TX-22 100BASE-TX HUB WITH LANVIEW®

SEH100TX-22 100BASE-TX HUB WITH LANVIEW®

SEH100TX-22 100BASE-TX HUB WITH LANVIEW®

SEHI100TX-22 100BASE-TX HUB WITH LANVIEW®

OUT

SEH100TX INTERCONNECT

IN

OUT

SEH100TX INTERCONNECT

IN

OUT

SEH100TX INTERCONNECT

IN

OUT

SEHI100TX INTERCONNECT

IN

1511_07

100BASE-TX HubSTACK
Interconnect Cable

Figure 4-5 Stacking the SEH and SEHI

6. Attach the other end of the interconnect cable to the “OUT” port on the

rear panel of the hub at the bottom of the stack.

Do not leave an interconnect cable connected at only one end
during network operation. Corrupted data may result.

!

CAUTION

7. Repeat steps 3 through 6 until all SEH hubs are connected.

SEH100TX User’s Guide 4-7

Chapter 4: Installation

4.4.2 Stacking Unmanaged SEH Hubs Together

Use the following procedure to stack non-intelligent hubs (SEHs)
together.

NOTE

1. Power up each SEH in the stack by plugging the power cord into the

2. Verify that the PWR LED for each hub is on, indicating that each SEH

3. Attach the interconnect cable to the “IN” port on the rear panel of the

4. Attach the other end of the interconnect cable to the “OUT” port on the

CAUTION

5. Continue connecting ports in this manner until all hubs are connected.

The SEH has a universal power supply that allows connection
to power sources from 100 Vac to 125 Vac @ 4.0 A or 200 Vac
to 250 Vac @ 2.0 A, 50/60 Hz.

back panel of the SEH and plugging the other end into a grounded
receptacle.

is receiving power.

second SEH in the stack as shown in Figure 4-5.

rear panel of the first SEH in the stack.

Do not leave an interconnect cable connected at only one end
during network operation. Corrupted data may result.

!

4.5 INSTALLING AN EPIM

This section contains procedures on how to replace an EPIM-100TX,
EPIM-100FX, or EPIM-100FMB to upgrade or change the capabilities of
your SEH100TX-22. After installing a ne w EPIM, refer to the appropriate
EPIM section in Appendix A to verify proper operation.

Observe all static precautions while handling an EPIM.

!

CAUTION

4-8 SEH100TX User’s Guide

Installing an EPIM

T o install an EPIM-100TX, EPIM-100FX, or EPIM-100FMB, proceed as
follows:

When removing an EPIM, pull the module straight out to
prevent damage to the connector.

!

CAUTION

1. Remove the coverplate or the existing EPIM (whichever applies).

2. Slide the new EPIM into place, making sure that the connectors on the

rear of the EPIM align correctly and firmly with the connector inside
the SEH. Refer to Figure 4-6.

3. Tighten the mounting screw.

EPIM 2

LNK

EPIM-100TX

EPIM 1

LNK

1510_09

Figure 4-6 Installing an EPIM

EPIM-100TX

SEH100TX User’s Guide 4-9

Chapter 4: Installation

4-10 SEH100TX User’s Guide

CHAPTER 5

CONNECTING TO THE NETWORK

This chapter outlines the procedure for connecting the SEH to a network.
Ensure that the network meets the guidelines and requirements outlined in
Chapter 3, Installation Requirements and Specifications, before
installing the SEH100TX-22.

5.1 CONNECTING THE SEH100TX-22 TO THE

NETWORK

The procedure for connecting network segments to the SEH varies
depending on the media and ports being connected. Refer to the following
list and perform the procedure described in the subsections that apply to
connecting the SEH to a network:

• Network Ports Section 5.1.1

• EPIM-100TX Section 5.1.2

• EPIM-100FX or EPIM-100FMB Section 5.1.3
Prior to connecting the network cabling, check the connectors for the

proper pinouts as shown in Chapter 3.

5.1.1 Connecting to Network Ports

Attach UTP segments to the RJ45 network ports on the front panel of the
SEH. Each RJ45 network port on the SEH incorporates a polarity
detection and correction feature. The polarity detection and correction
feature allows the SEH to pass data regardless of the polarity of the
twisted pair segment’s receive link. Operating in this condition is not
recommended; the segment should be removed from the network and
wired correctly by a technician.

Connect the twisted pair segments to the SEH as follows:

1. Plug the RJ45 connector from each twisted pair segment into the

desired network port on the SEH. See Figure 5-1.

2. Plug the RJ45 connector at the other end or the twisted pair segment

into the other device as appropriate.

SEH100TX User’s Guide 5-1

Chapter 5: Connecting to the Network

EPIM 2

12X

13X

14X

16X

15X

1X

2X

3X

4X

5X

LNK

EPIM-100TX

EPIM 1

1511_10

Figure 5-1 SEH Network Ports

3. Check that the applicable LNK LED for the port 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 the cable

specifications outlined in Section 3.1.2.

If a link is not established, contact Cabletron Systems Technical Support.
Refer to Section 1.3 for details on getting help.

5.1.2 Connecting to an EPIM-100TX

The EPIM-100TX is often used to provide a connection between the SEH
and a bridge, router, or switch. Normally, in this configuration, a
“straight-through” cable is used and the EPIM crossover switch, shown in
Figure 5-2, is set to “not crossed over.”

5-2 SEH100TX User’s Guide

Connecting the SEH100TX-22 to the Network

The EPIM-100TX is also used to provide another RJ45 port to connect to
a UTP segment. Before connecting a segment to the EPIM-100TX, check
each end of the segment to determine if the wires have been crossed over
for the proper connection. If the wires do not cross over , use the switch on
the EPIM-100TX to internally cross over the RJ45 port. Refer to
Figure 5-2 to set the EPIM-100TX crossover switch.

Position X
(crossed over)

1. RX+

2. RX-

3. TX+

4. NC

5. NC

6. TX-

7. NC

8. NC
Position =

(not crossed over)

1. TX+

2. TX-

3. RX+

4. NC

Figure 5-2 EPIM-100TX Crossover Switch

5. NC

6. RX-

7. NC

8. NC

1511_11

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

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

2. Plug the RJ45 connector at the other end of the twisted pair segment
into the other device as appropriate.

3. 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.

SEH100TX User’s Guide 5-3

Chapter 5: Connecting to the Network

c. Check the cable for continuity.
d. Check that the twisted pair connection meets the cable

specifications outlined in 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.

5.1.3 nnecting an EPIM-100FX or EPIM-100FMB

The EPIM-100FX and EPIM-100FMB have an SC style network port
(see Figure 5-3). Cabletron Systems supplies fiber optic cables that use
SC connectors that are keyed to insure proper crossover of the transmit
and receive fibers.

NOTE

An odd number of crossovers (preferably one) must be
maintained between devices so that the transmit port of one
device is connected to the receive port of the other device and
vice versa.

Use the following steps to connect a fiber segment to the EPIM-100FX or
EPIM-100FMB:

1. Remove the protective plastic covers from the fiber optic ports on the
module port and from the ends of the connectors.

Do not touch the ends of the fiber optic strands, and do not let
the ends come in contact with dust, dirt, or other contaminants.

!

CAUTION

Contamination of the ends causes problems in data
transmissions. If the ends become contaminated, clean them
with alcohol using a soft, clean, lint-free cloth.

2. Insert one end of the SC connector into the SEH EPIM-100FX or
EPIM-100FMB. See Figure 5-3.

3. At the other end of the fiber optic cable, attach the SC connector to the
other device.

5-4 SEH100TX User’s Guide

Testing the Installation

EPIM 2

12X

13X

14X

1510_10

16X

15X

1X

2X

3X

4X

5X

EPIM 1

EPIM-

LNK

100FX

Figure 5-3 EPIM-100FX Port

4. Check that the EPIM-100FX or EPIM-100FMB LNK LED is on. If

the LED is off, perform the following steps until it is on:
a. Check that the device at the other end of the link is powered up.
b. Verify that there is proper “cross-over” of the fiber optic strands

between the applicable port on the SEH and the fiber optic device
at the other end of the fiber optic segment.

c. Verify that the fiber optic connection meets the dB loss

specifications outlined in Section 3.1.3.

If a link is not established, contact Cabletron Systems Technical Support.
Refer to Section 1.3 for instructions on getting help.

5.2 TESTING THE INSTALLATION

The SEH100TX-22 is now ready for operation. Before placing the
network into service, test that all stations can be addressed and that the
SEH and all stations are indicating normal operation. Ensure that the
networking software is configured properly to match the installed
network. If there are any errors or abnormal operation, proceed to
Chapter 6, Troubleshooting.

SEH100TX User’s Guide 5-5

Chapter 5: Connecting to the Network

5-6 SEH100TX User’s Guide

CHAPTER 6

TROUBLESHOOTING

This chapter contains instructions for using LANVIEW LEDs to
troubleshoot physical layer network problems.

6.1 INSTALLATION T EST

After connecting the SEH to the network, verify that packets pass
between all Ethernet devices connected to the SEH and any other de vices
connected to the network. If there is a problem with any of the attached
devices, check the link as follows:

1. Check that the LNK LED, if applicable, for the port is on. If the LED

is off, perform each of the following steps until it is on.
a. Check that the 100BASE-T device at the other end of the twisted

pair segment is powered up.

b. Verify that the connector on the twisted pair segment has the

proper pinouts. Refer to Chapter 3, for the pin assignments for
twisted pair connectors.

c. For the EPIM-100FX or EPIM-100FMB, check that the TX and

RX strands are properly connected.

d. Check the cable for continuity. Several tools are available for this

test, depending on the media used.

e. Check that the twisted pair segments or fiber optic segments meet

the cable specifications as described in Chapter 3.

SEH100TX User’s Guide 6-1

Chapter 6: Troubleshooting

2. If the remote station is ready and the LNK LED is on, but no data
passes through the port, one of the following conditions may exist:

a. Network management has disabled the port. Correct this condition

by enabling the port through network management.

b. The port is segmented either because the collision detector was on

for more than 110 µs or the SEH detected more than 32
consecutive collisions on the attached segment. The affected port
remains segmented until a good packet is transmitted/received
without collisions.

If the LNK LED is still off, contact Cabletron Systems Technical
Support.

6.2 USING LANVIEW

The SEH incorporates the Cabletron Systems LANVIEW status
monitoring and diagnostics system. LANVIEW LEDs help diagnose
problems such as power failure or cable fault. The SEH includes the
following LANVIEW LEDs:

• PWR, for power status

• MGMT, for management status

• RCV (Receive), LNK (Link), and CLN (Collision) for Ethernet status

Figure 6-1 provides a quick reference chart of LED locations and
definitions. This chapter also includes a detailed description of each LED.

6-2 SEH100TX User’s Guide

HubSTACK 100BASE-TX HUB WITH LANVIEW®
SEH100TX-22

RCV
LNK

PWR

MGMT
CLN

RCV
LNK

11 10 9 8 7 6 5 4 3 2 1

Using LANVIEW

22 21 20 19 18 17 16 15 14 13 12

E

22X

2

E
1

11X

LED NAME

PWR
(Power)

MGMT
(Management)

CLN
(Collision)

RCV
(Receive)

LNK
(Link)

Flashing indicates an irregular LED pulse.

NOTE

Blinking indicates a steady LED pulse.

LED COLOR

Off
Green (Solid)
Green (Flashing)

Off
Red (Flashing)
Off
Yellow (Flashing)
Off
Green
Off

Figure 6-1 LANVIEW LEDs

DEFINITION

No power
Power
SEH managed by an

intelligent hub
SEH not managed
Collision
No collision
SEHI is receiving data
No activity
Link established
No Link

15101_02

PWR

When this green LED is on, it indicates that the SEH is receiving power.
If this LED is off, it indicates a loss of input power. Check that the power
cord is properly plugged into the SEH and into the ac input power source
(circuit breaker, fuse, etc.). If the proper source power is present, the
problem could be with the SEH.

SEH100TX User’s Guide 6-3

Chapter 6: Troubleshooting

MGMT

This LED flashes when an intelligent hub is managing the SEH. If this
LED is not flashing, an intelligent hub is not managing the SEH. If an
intelligent hub is attached to the SEH and the LED is not flashing, inspect
the HubSTACK interconnect cables for proper connection.

CLN

When this red LED flashes, it indicates that a collision has occurred on
one of the ports.

RCV

When a yellow RCV LED flashes, it indicates that the SEH is receiving
data packets from the associated port segment. Each SEH port has a
corresponding RCV LED:

• Network Ports: RCV LEDs 1-22

• EPIM 1: RCV LED E1

• EPIM 2: RCV LED E2

LNK

When a green LNK LED is on, it indicates an established link between
the associated port and the device at the other end of the segment. The
LNK LED remains on as long as a link is maintained. Each SEH Network
Port (ports 1-22) has a corresponding LNK LED.

6-4 SEH100TX User’s Guide

EPIM Specifications

APPENDIX A

EPIM INFORMATION

A.1 EPIM SPECIFICATIONS

EPIMs enable the connection of the SEH to the network using different
media types.The SEHI100TX-22 supports the EPIM-100TX,
EPIM-100FX, and the EPIM-100FMB. This appendix provides the
specifications for each EPIM.

A.1.1 EPIM-100TX

The EPIM-100TX is an RJ45 connector supporting Unshielded Twisted
Pair (UTP) cabling.

The slide switch on the EPIM-100TX determines the crossover status of
the cable pairs. If the switch is on the X side, the pairs are internally
crossed over. If the switch is on the = side, the pairs are not internally
crossed over. Figure A-1 shows the pinouts for the EPIM-100TX in both
positions.

Position X
(crossed over)

1. RX+

2. RX-

3. TX+

4. NC

SEH100TX User’s Guide A-1

5. NC

6. TX-

7. NC

8. NC
Position =

(not crossed over)

1. TX+

2. TX-

3. RX+

4. NC

Figure A-1 EPIM-100TX Pinouts

5. NC

6. RX-

7. NC

8. NC

1511_11

Appendix A: EPIM Information

A.1.2 EPIM-100FX

The EPIM-100FX shown in Figure A-2 supports Multimode Fiber Optic
cabling. The EPIM-100FX is equipped with an SC style connector.
Specifications for the EPIM-100FX are listed in Table A-1.

EPIM 2

12X

13X

14X

1510_10

15X

16X

1X

2X

3X

4X

5X

Figure A-2 EPIM-100FX

EPIM 1

EPIM-

LNK

100FX

Table A-1 Transmitter Power (EPIM-100FX)

Cable Type Worst Case Budget Typical Budget

50/125 µm fiber optic 6.0 dB 9.0 dB

62.5/125 µm fiber optic 9.0 dB 12.0 dB
100/140 µm fiber optic 15.0 dB 18.0 dB

The transmitter power levels listed above are peak power levels after
optical overshoot. A peak power meter must be used to correctly compare
the values giv en above to those measured on any particular port. If po wer
levels are being measured with an av erage power meter, add 3 dBm to the
measurement to compare the measured values to the values listed above.

A-2 SEH100TX User’s Guide

EPIM Specifications

A.1.3 EPIM-100FMB

The EPIM-100FMB shown in Figure A-3 supports multimode fiber optic
cabling and has an SC style connector.

12X

13X

14X

1511_20

15X

16X

1X

2X

3X

4X

5X

Figure A-3 EPIM-100FMB

EPIM 1

EPIM-

LNK

100FMB

The EPIM-100FMB acts as a non-filtering bridge. Its purpose is to extend
the Broadcast Domain of a shared access 100BASE-T LAN, so that a full
length of fiber optic cable can be used to reach the next domain or more
typically to a switch port.

The maximum 100BASE-T collision domain using UTP cable to the
desktop and fiber cable in the next domain or switch port is only 263
meters (100 meters of UTP and 163 meters of fiber optics). There are
circumstances where the maximum fiber optic cable length of 163 meters
does not meet some requirements such as in the cabling of high rise
buildings or campus environments. The EPIM-100FMB helps meet these
requirements by extending the maximum fiber optic cable length that can
be used from 163 meters to 400 meters.

SEH100TX User’s Guide A-3

Appendix A: EPIM Information

Table A-2 provides the specifications for the EPIM-100FMB.

Table A-2 Transmitter Power (EPIM-100FMB)

Cable Type Worst Case Budget Typical Budget

50/125 µm fiber optic 6.0 dB 9.0 dB

62.5/125 µm fiber optic 9.0 dB 12.0 dB
100/140 µm fiber optic 15.0 dB 18.0 dB

The transmitter power levels and receive sensitivity levels listed are peak
power lev els after optical overshoot. A peak power meter must be used to
correctly compare the values given above to those measured on any
particular port. If power lev els are being measured with an a v erage po wer
meter, add 3 dBm to the measurement to compare the measured v alues to
the values listed above.

A-4 SEH100TX User’s Guide

INDEX

Numerics

100BASE-TX

cable length 3-2
crosstalk 3-2
impedance 3-2
jitter 3-2
noise 3-2
temperature 3-3

A

Agency approvals

emission 3-6
immunity 3-7
safety 3-6

C

Cable

interconnecting SEHs 3-1
lengths 3-4

Cable specifications

multimode fiber optic 3-3
overview of 3-1
UTP 3-2

H

Help

related manuals 1-4

HubSTACK

cable requirements 3-1

I

Immunity 3-7
Installation 5-5, 6-1

EPIMs 4-8
rackmount 4-3
stacking 4-5
strain-relief bracket 4-3
tabletop or shelf 4-2
testing 6-1
unpacking 4-1

Interconnecting SEHs

requirements for 3-1

L

LANVIEW

LEDs 6-3
use of 6-2

D

Dimensions 3-7

E

Emission, agency approvals 3-6
Environmental requirements 3-6
EPIM media type, connector 2-4
EPIM specifications

EPIM-100FMB A-3
EPIM-100FX A-2
EPIM-100TX A-1

EPIM-100FMB

connection of 5-4

EPIM-100FX

connection of 5-4

EPIM-100TX

connection of 5-2

SEH100TX User’s Guide Index-1

N

Network connection

EPIM-100FMB 5-4
EPIM-100FX 5-4
EPIM-100TX 5-2
SEH100TX-22 5-1

Network connection, UTP

segments 5-1

Network port specifications

SEH100TX-22 3-5

P

Power supply requirements 3-6

Index

S

Safety, agency approval 3-6
SEH features 2-2
SEH100TX-22

connection of 5-1

Size

dimensions 3-7

Specifications

environmental requirements 3-6
power supply requirements 3-6
SEH network ports 3-5

T

Testing 5-5
Troubleshooting 6-1

U

UTP

specification of 3-1

UTP segments

connection of 5-1

Index-2 SEH100TX User’s Guide

POWER SUPPLY CORD

The mains cord used with this equipment must be a 2 conductor plus ground type
with minimum 0.75 mm square conductors and must incorporate a standard IEC
appliance coupler on one end and a mains plug on the other end which is suitable
for the use and application of the product and that is approved for use in the
country of application.

GERMAN:

Die Netzleitung, die mit diesem Geraet benuetzt wird, soll einen zwei Leiter mit
Erdleiter haben, wobei die Leiter mindestens 0.75 mm sind, mit einer normalen
IEC Geraetesteckdose an einem Ende und einem Geraetestecker am anderen Ende
versehen sind, der fuer den Gebrauch und die Anwendung des Geraetes geeignet
und der zum Benuetzen im Lande der Anwendung anerkannt ist.

SPANISH:

El cable principal de la red eléctrica utilizado con este equipo debe tener 2
conductores y 1 toma de tierra con un mínimo de 0.75 mm2 cada uno y necesita
tener un aparato de acoplamiento standard IEC en un extremo y un enchufe para
el cable principal de la red eléctrica en el otro extremo, lo cual sea adecuado para
el uso y applicación del producto y lo cual sea aprobado para uso en el pais de
applicación.

FRENCH:

Le cordon d' alimentation reliant cet appareil au secteur doit obligatoirement avoir
deux fils conducteurs de 0.75 mm2 minimum et un fil de terre. It doit également
être équipé du côté appareil d'une fiche agrée IEC et du côte secteur, d'une prise
adaptée à l'usage du produit et aux normes du pays où l'appareil est utilisé.