Cabletron Systems SEHI-22 User manual

SEHI-22 AND SEHI-24 10BASE-T
INTELLIGENT STACKABLE HUBS
USER’S GUIDE
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005

SEHI USER’S GUIDE i
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 August 1995 by: Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005
All Rights Reserved
Printed in the United States of America
Order Number: 9031490 August 1995
SPECTRUM , LANVIEW , and RemoteLANVIEW are registered trademarks and EPIM , EPIM-A ,
EPIM-F1 , EPIM-F2 , EPIM-F3 , EPIM-T , EPIM-X , FOT-F , FOT-F3 , HubSTACK ,
MicroMMAC , SEH , SEHI , and TMS-3 are trademarks of Cabletron Systems, Inc.
i960 is a registered trademark of Intel Corporation.
CHAMP is a trademark of AMP, Inc.
CompuServe is a registered trademark of CompuServe, Inc.
DEC , VT200 , VT300 , and VT320 are trademarks of Digital Equipment Corporation.
Ethernet is a trademark of Xerox Corporation.
IBM is a registered trademark of International Business Machines Corporation.
ST is a registered trademark of American Telephone and Telegraph Company.
UNIX is a trademark of Unix Systems Laboratories, Inc.
Windows is a registered trademark of Microsoft Corporation.
This electric hazard symbol appears in the SEHI User’s Guide. Read all
instructions following this symbol. Failure to follow the instructions
appearing with this symbol could result in the presence of an electric
hazard which has the potential to cause injury.
Printed On Recycled Paper

NOTICE
ii SEHI USER’S GUIDE
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,pursuanttoPart15of the FCC rules.These limits are designedto 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
thisequipment in a residentialarea is likelyto cause interference inwhich case theuserwill 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.
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.

NOTICE
SEHI USER’S GUIDE iii
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.
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. OTHER RESTRICTIONS. You may not reverse engineer, decompile, or disassemble the
Program.
3. 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.

NOTICE
iv SEHI USER’S GUIDE
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.

SEHI USER’S GUIDE v
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION
1.1 USING THIS MANUAL............................................................................1-1
1.2 GETTING HELP ......................................................................................1-2
1.3 SEHI OVERVIEW....................................................................................1-3
1.4 SEHI FEATURES....................................................................................1-3
1.5 STACKABLE CAPABILITIES ..................................................................1-4
1.6 REMOTE NETWORK MANAGEMENT CAPABILITIES..........................1-5
1.7 OPTIONAL FEATURES ..........................................................................1-5
1.8 RELATED MANUALS..............................................................................1-7
CHAPTER 2 INSTALLATION
REQUIREMENTS/SPECIFICATIONS
2.1 CABLE SPECIFICATIONS......................................................................2-1
2.1.1 HubSTACK Interconnect Cable Requirements........................ 2-1
2.1.2 UTP and STP Cable Specifications.......................................... 2-2
2.2 NETWORK PORT SPECIFICATIONS ....................................................2-4
2.3 COM PORT REQUIREMENTS ...............................................................2-4
2.4 TRANSCEIVER REQUIREMENTS.........................................................2-5
2.5 OPERATING SPECIFICATIONS.............................................................2-5
CHAPTER 3 INSTALLATION
3.1 UNPACKING THE SEHI..........................................................................3-1
3.2 PRE-INSTALLATION CHECKOUT .........................................................3-2
3.3 INSTALLING THE SEHI..........................................................................3-2
3.3.1 Tabletop or Shelf Installation.................................................... 3-3
3.3.2 Rackmount Installation Requirements...................................... 3-4
3.3.3 Attaching the Strain Relief Bracket........................................... 3-5
3.3.4 Rackmounting the SEHI........................................................... 3-6
3.3.5 Stacking the SEHI.................................................................... 3-7
3.4 CONNECTING THE SEHI TO THE POWER SOURCE..........................3-9
3.5 ADDING/REPLACING EPIMs ...............................................................3-10
CHAPTER 4 CONNECTING TO THE NETWORK
4.1 CONNECTING THE SEHI TO THE NETWORK .....................................4-1
4.1.1 Connecting to Network Ports, SEHI-22 and SEHI-24 .............. 4-1
4.1.2 Connecting a UTP Segment to an EPIM-T .............................. 4-3
4.1.3 Connecting a Fiber Segment to an EPIM-F1/F2/F3................. 4-4
4.1.4 Connecting a Thin-Net Segment to an EPIM-C ....................... 4-7
4.1.5 Connecting an AUI Cable to an EPIM-A .................................. 4-8
4.1.6 Connecting an AUI Cable to an EPIM-X ................................ 4-10
4.2 FINISHING THE INSTALLATION..........................................................4-11

CONTENTS
vi SEHI USER’S GUIDE
CHAPTER 5 TROUBLESHOOTING
5.1 INSTALLATION CHECK-OUT.................................................................5-1
5.2 USING LANVIEW ....................................................................................5-2
5.3 USING THE RESET BUTTON.................................................................5-4
5.4 SETTING THE NVRAM SWITCH............................................................5-5
CHAPTER 6 LOCAL MANAGEMENT
6.1 MANAGEMENT TERMINAL REQUIREMENTS......................................6-2
6.1.1 Console Cable Configuration.................................................... 6-2
6.1.2 Management Terminal Setup Parameters................................ 6-3
6.2 ACCESSING LOCAL MANAGEMENT....................................................6-5
6.3 USING THE LOCAL MANAGEMENT SCREENS ...................................6-7
6.3.1 The Community Name Table Screen....................................... 6-7
6.3.2 The Configuration Screen....................................................... 6-10
6.3.3 The Trap Table Screen........................................................... 6-15
6.3.4 The SNMP Tools Screen........................................................ 6-17
6.3.5 The Device Statistics Screen.................................................. 6-22
APPENDIX A EPIM INFORMATION
A.1 EPIM SPECIFICATIONS........................................................................ A-1
A.1.1 EPIM-T ..................................................................................... A-1
A.1.2 EPIM-F1 and EPIM-F2............................................................. A-2
A.1.3 EPIM-F3 ................................................................................... A-3
A.1.4 EPIM-C..................................................................................... A-5
A.1.5 EPIM-A and EPIM-X (AUI Port)................................................ A-6
APPENDIX B IMAGE FILE DOWNLOAD USING OIDs
B.1 SETTING UP A UNIX WORKSTATION AS A TFTP SERVER............... B-1
B.2 STANDARD LOCAL DOWNLOAD......................................................... B-3
INDEX

SEHI USER’S GUIDE 1-1
CHAPTER 1
INTRODUCTION
Welcome to the Cabletron Systems SEHI-22 and SEHI-24 10BASE-T
Intelligent Stackable Hub User’s Guide
. This manual provides
installation instructions and reference information for the SEHI-22 and
SEHI-24.
Figure 1-1. Front and Rear Views of the SEHI-22 and SEHI-24
1.1 USING THIS MANUAL
Read through this manual to gain an understanding of the features and
capabilities of the SEHI. A general knowledge of Ethernet and IEEE
802.3 type data communications networks and their physical layer
components is helpful when installing the SEHI.
HubSTACK10BASE-T HUB WITH LANVIEW®
SEHI-22
1491_1
EPIM-1
EPIM-2
HubSTACK10BASE-T HUB WITH LANVIEW®
SEHI-24
HubSTACK10BASE-T HUB WITH LANVIEW®
SEHI-24
EPIM-1
HubSTACK10BASE-T HUB WITH LANVIEW®
SEHI-22
SEH INTERCONNECT OUT
SEH INTERCONNECT OUT
PWR
CPU
CLN E1
E2
RCV
LNK
RCV
LNK
24 22 20 18 16 14 12 246810
23 21 19 17 15 13 11 13579
2X4X6X8X10X12X
14X16X18X20X22X24X
1X3X5X7X9X11X13X15X17X19X21X23X
COM
RESET
PWR
CPU
CLN E1
RCV
LNK
RCV
LNK
12 246810
11 13579
2X4X6X8X10X12X
1X3X5X7X9X11X
COM
RESET

CHAPTER 1: INTRODUCTION
1-2 SEHI USER’S GUIDE
Chapter 1, Introduction , outlines the contents of this manual, briefly
describes SEHI features, and concludes with a list of related manuals.
Chapter 2,
Installation Requirements/Specifications , describes
installation requirements, network guidelines, and SEHI operating
specifications.
Chapter 3,
Installation , contains instructions for installing the SEHI as a
stackable or stand-alone hub.
Chapter 4,
Connecting to the Network , explains how to connect the
SEHI to the network using the various media types.
Chapter 5,
Troubleshooting , describes how to use the LANVIEW LEDs
to troubleshoot network problems.
Chapter 6,
Local Management , describes how to use SEHI Local
Management screens and the available commands.
Appendix A,
EPIM Information , provides specifications, cabling
information, and switch settings for the Ethernet Port Interface Modules.
Appendix B,
Image File Download Using OIDs , provides instructions
for setting up a tftp server and downloading image files to the SEHI by
setting specific MIB OID strings.
1.2 GETTING HELP
To obtain additional support related to the Cabletron Systems SEHI, or if
there are any questions, comments, or suggestions concerning this
manual, contact Cabletron Systems Technical Support:
By phone ...................[phone]
Monday-Friday; 8am - 8pm Eastern Time
By CompuServe........GO CTRON from any ! prompt
By Internet mail [email protected]
By FTP......................134.141.197.25
Login:
anonymous , Password: your email address

SEHI OVERVIEW
SEHI USER’S GUIDE 1-3
1.3 SEHI OVERVIEW
The 10BASE-T SEHI-22 and SEHI-24 are intelligent repeater hubs. The
SEHI-22 has 12 RJ45 ports and one Ethernet Port Interface Module
(EPIM) port on the front panel for network connections while the
SEHI-24 has 24 RJ45 ports and two EPIM ports on the front panel for
network connections. Both models have one rear panel HubSTACK
Interconnect Bus port for stackable connections. The SEHI is designed to
manage the Cabletron SEH series of non-intelligent stackable hubs.
1.4 SEHI FEATURES
Repeater Functionality
The SEHI fully conforms to the IEEE 802.3 Repeater, AUI, and
10BASE-T specifications, and provides the flexibility to connect
networks using IEEE 802.3, Ethernet Version 1 or Version 2 equipment.
The SEHI transmits retimed data packets, regenerates the preamble,
extends fragments, and arbitrates collisions.
The SEHI automatically partitions problem segments, and reconnects
repaired segments to the network. This feature minimizes the impact on
network operation resulting from a problem on one segment by isolating
the problem segment. Only devices on the problem segment are affected.
When the problem is solved, the SEHI automatically reconnects the
isolated segment to the network.
Polarity Detection and Correction
Each twisted pair port on the SEHI incorporates a Polarity Detection and
Correction feature that allows the SEHI to pass data regardless of the
polarity of the twisted pair segment’s receive link. Cabletron does not
recommend operating in this condition. When this condition is detected,
remove the segment from the network and wire it correctly to reduce the
potential for problems if equipment changes are made.
Flash EEPROMs
The SEHI uses Flash EEPROMs that allow the downloading of new and
updated firmware in conjunction with Cabletron’s Remote LANVIEW/
Windows, version 2.3 or later or any device utilizing BOOTP or TFTP
protocols.