Cabletron Systems Switch 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 and BRIM are registered trademarks and Element Manager, EPIM,  
EPIM-100FX, EPIM-100TX, EPIM-100FMB, HubSTACK, MicroMMAC, SEH, and SEHI are  
trademarks of Cabletron Systems, Inc.  
All other product names mentioned in this manual may be trademarks or registered trademarks of  
their respective companies.  
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: Changes or modifications made to this device which are not expressly approved by the  
party responsible for compliance could void the user’s authority to operate the equipment.  
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 Technology 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: Before utilizing this product, carefully read this License Agreement.  
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, PROMPTLY RETURN THE UNUSED  
PRODUCT TO THE PLACE OF PURCHASE FOR A FULL REFUND.  
ii  
SEH100TX User’s Guide  
 
Notice  
CABLETRON SOFTWARE PROGRAM LICENSE  
1.  
LICENSE. You have the right to use only the one (1) copy of the Program provided in this  
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.  
3.  
OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the  
Program.  
APPLICABLE LAW. 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.  
EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY  
1.  
EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in  
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  
ACCOMPANYING WRITTEN MATERIALS, AND ANY ACCOMPANYING 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.  
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): 89/336/EEC  
73/23/EEC  
Manufacturer’s Name: Cabletron Systems, Inc.  
Manufacturer’s Address: 35 Industrial Way  
PO Box 5005  
Rochester, NH 03867  
European Representative Name: Mr. J. Solari  
European Representative Address: Cabletron Systems Limited  
Nexus House, Newbury Business Park  
London Road, Newbury  
Berkshire RG13 2PZ, England  
Conformance to Directive(s)/Product Standards: EC Directive 89/336/EEC  
EC Directive 73/23/EEC  
EN 55022  
EN 50082-1  
EN 60950  
Equipment Type/Environment: Networking Equipment, for use in a  
Commercial or Light Industrial  
Environment.  
We 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  
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 SEH100TX-22 100BASE-T  
Stackable Hub User’s Guide. This manual provides installation  
instructions, troubleshooting and reference information for the  
SEH100TX-22.  
The terms SEH (Stackable Ethernet Hub) and SEHI (Stackable  
Ethernet Hub with Intelligence) are used throughout this  
NOTE  
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, outlines the contents and describes the  
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, briefly describes SEH features  
and provides information about available options.  
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 symbol. Calls the reader’s attention to any item of  
information that may be of special importance.  
NOTE  
Tip symbol. Conveys helpful hints concerning procedures or  
actions.  
TIP  
Caution symbol. Contains information essential to avoid  
damage to the equipment.  
!
CAUTION  
Electrical Hazard Warning symbol. Warns against an action  
that could result in personal injury or death due to an electrical  
hazard.  
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  
(603) 332-9400  
Monday – Friday; 8 A.M. – 8 P.M. Eastern Time  
CompuServe  
Internet mail  
GO CTRON from any ! prompt  
FTP  
ctron.com (134.141.197.25)  
anonymous  
Login  
Password  
your email address  
BBS  
(603) 335-3358  
Modem setting 8N1: 8 data bits, 1 stop bit, No parity  
For additional information about Cabletron Systems products, visit our  
World Wide Web site: http://www.cabletron.com/  
Before calling Cabletron Systems Technical Support, have the following  
information ready:  
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 SEHI100TX-22 100BASE-T Intelligent  
Stackable Hub Users Guide to supplement the procedures and other  
technical data provided in this manual. The procedures contained in the  
SEHI100TX-22 100BASE-T Intelligent Stackable Hub Users Guide are  
referenced where appropriate, but not repeated in this manual.  
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.  
The abbreviations SEH (Stackable Ethernet Hub) and SEHI  
(Stackable Ethernet Hub with Intelligence) are used throughout  
NOTE  
this manual when referring to the SEH100TX-22 and the  
SEHI100TX-22, respectively.  
EPIM 2  
HubSTACK 100BASE-TX HUB WITH LANVIEW®  
SEH100TX-22  
RCV  
LNK  
E
2
22 21 20 19 18 17 16 15 14 13 12  
22X 21X 20X 19X 18X 17X  
16X 15X 14X 13X 12X  
PWR  
MGMT  
CLN  
RCV  
LNK  
E
1
11 10  
9
8
7
6
5
4
3
2
1
11X 10X  
9X  
8X  
7X  
6X  
5X  
4X  
3X  
2X  
1X  
EPIM  
1
Port Status LEDs  
System LEDs  
Network Ports 1-22  
EPIM Slots  
SEH100TX-22 100BASE-T HUB WITH LANVIEW®  
OUT  
SEH100TX INTERCONNECT  
IN  
SN  
Interconnect Bus "OUT" Port  
Interconnect Bus "IN" Port  
Power Supply  
REAR VIEW  
Figure 2-1 Front and Rear Views of the SEH100TX-22  
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  
environment. Connect the SEH100TX-22 only to similar  
100BASE-T products such as the SEHI100TX-22.  
!
CAUTION  
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, Installation, for complete rack mounting instructions.  
SEH100TX User’s Guide  
2-3  
 
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  
Category 5 Unshielded Twisted  
Pair Cable  
EPIM-100TX  
EPIM-100FX  
RJ45  
SC  
Multimode Fiber Optic Cable  
Multimode Fiber Optic Cable  
EPIM-100FMB for  
buffered uplinks  
SC  
For more details about the EPIMs, refer to Appendix A.  
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  
this equipment. Failure to follow these guidelines could result in  
poor network performance.  
!
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.  
Take 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 transceivers 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  
Test 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.  
A stack of five SEH hubs or four SEH hubs and one SEHI hub  
is equivalent to one repeater.  
NOTE  
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
B
DTE  
DTE  
Figure 3-1 Class I Network  
3-4  
SEH100TX User’s Guide  
 
 
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  
Fiber  
Number  
of  
Repeaters  
UTP &  
Multimode UTP &  
Optics&  
Buffered  
EPIM  
UTP  
Multimode  
Fiber  
Buffered  
EPIM  
1
200 m 263 m  
274 m  
500 m  
800 m  
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  
9X  
11X  
10X  
1. Receive +  
2. Receive -  
3. Transmit +  
4. Not Used  
5. Not Used  
6. Transmit -  
7. Not Used  
8. Not Used  
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 power supply. The input power requirements are  
listed in Table 3-2.  
Table 3-2 Power Requirements  
Line Input Range  
Current  
Frequency  
100–125 Vac  
200–250 Vac  
4.0 A  
2.0 A  
50/60 Hz  
3.4.2  
Environmental Requirements  
The environmental requirements for the SEH are detailed in this section.  
Operating Temperature:  
Storage Temperature:  
Operating Humidity:  
5°C to 40°C  
(41°F to 104°F)  
-30°C to 73°C (-22°F to 164°F)  
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.  
A single phase grounded power receptacle that meets the  
power supply requirements listed in Chapter 3 must be located  
NOTE  
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  
C
B
EPIM 2  
HubSTACK 100BASE-TX HUB WITH LANVIEW®  
SEH100TX-22  
RCV  
LNK  
E
2
22 21 20 19 18 17 16 15 14 13 12  
22X 21X 20X 19X 18X 17X  
16X 15X 14X 13X 12X  
PWR  
MGMT  
CLN  
RCV  
LNK  
E
1
A
11 10  
9
8
7
6
5
4
3
2
1
11X 10X  
9X  
8X  
7X  
6X  
5X  
4X  
3X  
2X  
1X  
EPIM  
1
D
A = 15.24 cm (6 in)  
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  
1
E P I M  
5 X  
4 X  
3 X  
2 X  
1 X  
1 1 X 1 0 X  
9 X  
1
E
8 X  
7 X  
6 X  
1 0  
9
1 8  
7
6
5
4
3
2
1
C L N  
L N K  
R C V  
M G M T  
P W R  
1 6 X 1 5 X 1 4 X 1 3 X 1 2 X  
2 2 X 2 1 X 2 0 X 1 9 X 1 8 X 1 7 X  
2
2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2  
L N K  
R C V  
E
2 2  
1 0 0 T X S - E H  
L A N W V I T I E H W ®  
1 0 0 B A A S E C - K T X H H U u B b S T  
2
E P I M  
1510_12  
Figure 4-2 Attaching the Strain-Relief Bracket  
SEH100TX User’s Guide  
4-3  
 
   
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)  
EPIM 2  
HubSTACK 100BASE-TX HUB WITH LANVIEW®  
SEH100TX-22  
RCV  
LNK  
E
2
22 21 20 19 18 17 16 15 14 13 12  
22X 21X 20X 19X 18X 17X  
16X 15X 14X 13X 12X  
PWR  
MGMT  
CLN  
RCV  
LNK  
E
1
11 10  
9
8
7
6
5
4
3
2
1
11X 10X  
9X  
8X  
7X  
6X  
5X  
4X  
3X  
2X  
1X  
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  
adequate clearance (two inches on either side and in the  
rear) for unrestricted air flow. The temperature for the selected  
location must be maintained between 5°C and 40°C, and  
fluctuate less than 10°C per hour.  
!
CAUTION  
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  
EPIM 2  
HubSTACK 100BASE-TX HUB WITH LANVIEW®  
SEH100TX-22  
RCV  
LNK  
E
2
22 21 20 19 18 17 16 15 14 13 12  
22X 21X 20X 19X 18X 17X  
16X 15X 14X 13X 12X  
PWR  
MGMT  
CLN  
RCV  
LNK  
E
1
11 10  
9
8
7
6
5
4
3
2
1
11X 10X  
9X  
8X  
7X  
6X  
5X  
4X  
3X  
2X  
1X  
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  
!
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:  
The SEH and the SEHI have universal power supplies that  
allow connection to power sources from 100 Vac to 125 Vac  
NOTE  
@ 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.  
Locate the SEHI at the bottom of the stack.  
NOTE  
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 NOT connect the interconnect cable 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®  
OUT  
SEH100TX INTERCONNECT  
IN  
SEH100TX-22 100BASE-TX HUB WITH LANVIEW®  
100BASE-TX HubSTACK  
Interconnect Cable  
OUT  
SEH100TX INTERCONNECT  
IN  
SEH100TX-22 100BASE-TX HUB WITH LANVIEW®  
OUT  
SEH100TX INTERCONNECT  
IN  
SEHI100TX-22 100BASE-TX HUB WITH LANVIEW®  
OUT  
SEHI100TX INTERCONNECT  
IN  
1511_07  
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.  
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  
NOTE  
to 250 Vac @ 2.0 A, 50/60 Hz.  
back panel of the SEH and plugging the other end into a grounded  
receptacle.  
2. Verify that the PWR LED for each hub is on, indicating that each SEH  
is receiving power.  
3. Attach the interconnect cable to the “IN” port on the rear panel of the  
second SEH in the stack as shown in Figure 4-5.  
4. Attach the other end of the interconnect cable to the “OUT” port on the  
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.  
!
CAUTION  
5. Continue connecting ports in this manner until all hubs are connected.  
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 new 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  
To 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  
EPIM-100TX  
1510_09  
Figure 4-6 Installing an EPIM  
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  
list and perform the procedure described in the subsections that apply to  
connecting the SEH to a network:  
Network Ports  
EPIM-100TX  
Section 5.1.1  
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  
15X  
LNK  
16X  
EPIM-100TX  
1X  
2X  
3X  
4X  
5X  
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.  
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  
 
   
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  
5. NC  
6. RX-  
7. 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 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.  
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.  
An odd number of crossovers (preferably one) must be  
maintained between devices so that the transmit port of one  
NOTE  
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.  
the ends come in contact with dust, dirt, or other contaminants.  
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.  
!
CAUTION  
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  
1X  
13X  
2X  
14X  
3X  
15X  
4X  
LNK  
16X  
5X  
100FX  
EPIM-  
EPIM 1  
1510_10  
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 TEST  
After connecting the SEH to the network, verify that packets pass  
between all Ethernet devices connected to the SEH and any other devices  
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  
 
Using LANVIEW  
HubSTACK 100BASE-TX HUB WITH LANVIEW®  
SEH100TX-22  
RCV  
LNK  
E
2
22X  
11X  
22 21 20 19 18 17 16 15 14 13 12  
PWR  
MGMT  
CLN  
RCV  
LNK  
E
1 1  
11 10  
9
8
7
6
5
4
3
2
LED NAME  
LED COLOR  
Off  
DEFINITION  
No power  
Power  
PWR  
(Power)  
Green (Solid)  
MGMT  
(Management)  
Green (Flashing)  
SEH managed by an  
intelligent hub  
Off  
SEH not managed  
Collision  
CLN  
Red (Flashing)  
(Collision)  
Off  
No collision  
RCV  
(Receive)  
Yellow (Flashing)  
SEHI is receiving data  
No activity  
Off  
LNK  
(Link)  
Green  
Off  
Link established  
No Link  
15101_02  
Figure 6-1 LANVIEW LEDs  
Flashing indicates an irregular LED pulse.  
Blinking indicates a steady LED pulse.  
NOTE  
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  
EPIM 1: RCV LED  
1-22  
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  
5. NC  
6. TX-  
7. NC  
8. NC  
Position =  
(not crossed over)  
1. TX+  
2. TX-  
3. RX+  
4. NC  
5. NC  
6. RX-  
7. NC  
8. NC  
1511_11  
Figure A-1 EPIM-100TX Pinouts  
SEH100TX User’s Guide  
A-1  
 
 
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  
15X  
LNK  
16X  
100FX  
EPIM-  
1X  
2X  
3X  
4X  
EPIM 1  
5X  
1510_10  
Figure A-2 EPIM-100FX  
Table A-1 Transmitter Power (EPIM-100FX)  
Cable Type  
Worst Case Budget  
Typical Budget  
50/125 µm fiber optic  
62.5/125 µm fiber optic  
100/140 µm fiber optic  
6.0 dB  
9.0 dB  
15.0 dB  
9.0 dB  
12.0 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 given above to those measured on any particular port. If power  
levels are being measured with an average 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  
15X  
LNK  
16X  
100FMB  
EPIM-  
1X  
2X  
3X  
4X  
EPIM 1  
5X  
1511_20  
Figure A-3 EPIM-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  
6.0 dB  
Typical Budget  
9.0 dB  
50/125 µm fiber optic  
62.5/125 µm fiber optic  
100/140 µm fiber optic  
9.0 dB  
12.0 dB  
15.0 dB  
18.0 dB  
The transmitter power levels and receive sensitivity levels listed are peak  
power levels 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 levels are being measured with an average power  
meter, add 3 dBm to the measurement to compare the measured values 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  
H
Help  
related manuals 1-4  
HubSTACK  
cable requirements 3-1  
noise 3-2  
temperature 3-3  
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  
A
Agency approvals  
emission 3-6  
immunity 3-7  
safety 3-6  
unpacking 4-1  
Interconnecting SEHs  
requirements for 3-1  
C
Cable  
interconnecting SEHs 3-1  
lengths 3-4  
Cable specifications  
multimode fiber optic 3-3  
overview of 3-1  
UTP 3-2  
L
LANVIEW  
LEDs 6-3  
use of 6-2  
D
N
Dimensions 3-7  
Network connection  
EPIM-100FMB 5-4  
EPIM-100FX 5-4  
EPIM-100TX 5-2  
SEH100TX-22 5-1  
Network connection, UTP  
segments 5-1  
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  
Network port specifications  
SEH100TX-22 3-5  
P
connection of 5-4  
EPIM-100FX  
Power supply requirements 3-6  
connection of 5-4  
EPIM-100TX  
connection of 5-2  
SEH100TX User’s Guide  
Index-1  
 
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.  
 
 

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