Cabletron Systems SEH-24 User manual

SEH-22, SEH-24, SEH-32, AND SEH-34
10BASE-T STACKABLE HUB
USER’S GUIDE
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005
The Complete Networking Solution™

NOTICE
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.
INNOEVENTSHALLCABLETRONSYSTEMSBELIABLEFORANYINCIDENTAL,
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 February 1994 by:
Cabletron Systems, Inc.
P.O. Box 5005, Rochester, NH 03867-0505
All Rights Reserved
Printed in the United States of America
Order Number: 9030903-01 February 94
SPECTRUM
®
, LANVIEW
®
, Remote LANVIEW
®
, HubSTACK
™
, and
MicroMMAC
™
are trademarks of Cabletron Systems, Inc.
IBM is a registered trademark of International Business Machines Corporation.
CompuServe is a registered trademark of CompuServe, Inc.
DEC , VT200 , and VT300 are trademarks of Digital Equipment Corporation.
Ethernet is a trademark of Xerox Corporation.
Windows is a registered trademark of Microsoft Corporation.
Printed On Recycled Pa
per

NOTICE
ii
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.
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.

NOTICE
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
TERMSOFTHISAGREEMENT,PROMPTLYRETURNTHEUNUSEDPRODUCTTO
THE PLACE OF PURCHASE FOR A FULL REFUND.
CABLETRON SOFTWARE PROGRAM LICENSE
1. LICENSE. Youhavetherighttouseonly the one (1)copyof 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
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 EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
MERCHANTABLITY AND FITNESS FOR A PARTICULAR PURPOSE, WITH
RESPECTTO 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 WARRANTEES 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

CONTENTS
v
TABLE OF CONTENTS
APPENDIX A TABLE OF CONTENTS v
CHAPTER 1 INTRODUCTION
1.1 USING THIS MANUAL............................................................1-1
1.2 GETTING HELP........................................................................1-2
1.3 SEH OVERVIEW.......................................................................1-2
1.4 SEH FEATURES .......................................................................1-3
1.5 STACKABLE CAPABILITIES..................................................1-4
1.6 OPTIONAL FEATURES ...........................................................1-4
1.7 RELATED MANUALS ..............................................................1-5
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 for the Network Ports
and EPIM-T Module......................................................2-2
2.1.3 Multimode Fiber Optic Cable Specifications for the
EPIM-F1 and EPIM-F2 Modules .................................2-4
2.1.4 Single Mode Fiber Optic Cable Specifications for
the EPIM-F3 Module ....................................................2-5
2.1.5 Thin-net Network Requirements for the EPIM-C Mod-
ule 2-6
2.1.6 AUI Cable Requirements for the EPIM-A and EPIM-X
Modules..........................................................................2-7
2.2 NETWORK PORT SPECIFICATIONS ....................................2-7
2.2.1 SEH-22 and SEH-24 Network Port Specifications......2-8
2.2.2 SEH-32 and SEH-34 Network Port Specifications......2-8
2.3 EPIM SPECIFICATIONS .......................................................2-10
2.3.1 EPIM-T........................................................................2-10
2.3.2 EPIM-F1/F2.................................................................2-11
2.3.3 EPIM-F3......................................................................2-12
2.3.4 EPIM-C........................................................................2-14
2.3.5 EPIM-A and EPIM-X (AUI Port)................................2-15
2.4 TRANSCEIVER REQUIREMENTS.......................................2-16
2.5 OPERATING SPECIFICATIONS...........................................2-16

CONTENTS
vi
CHAPTER 3 INSTALLATION
3.1 UNPACKING THE SEH............................................................3-1
3.2 INSTALLING THE SEH............................................................3-1
3.2.1 Stacking the SEH..........................................................3-2
3.2.2 Attaching the Strain Relief Bracket.............................3-4
3.2.3 Rack Mounting the SEH...............................................3-5
3.2.4 Wall Mounting the SEH................................................3-6
3.2.5 Free-Standing Installation............................................3-7
3.3 CONNECTING THE SEH TO THE POWER SOURCE..........3-8
CHAPTER 4 CONNECTING TO THE NETWORK
4.1 CONNECTING THE SEH TO THE NETWORK .....................4-1
4.1.1 Connecting Network Ports SEH-22 and SEH-24.........4-1
4.1.2 Connecting Network Ports SEH-32 and SEH-34.........4-3
4.1.3 Connecting a UTP Segment to an EPIM-T..................4-4
4.1.4 Connecting a Fiber Optic Link Segment to an EPIM-F1,
EPIM-F2, or EPIM-F34-5
4.1.5 Connecting a Thin-Net Segment to an EPIM-C ..........4-8
4.1.6 Connecting an AUI Cable to an EPIM-A ...................4-10
4.1.7 Connecting an AUI Cable to an EPIM-X....................4-11
4.2 FINISHING THE INSTALLATION........................................4-12
CHAPTER 5 TROUBLESHOOTING
5.1 INSTALLATION CHECK-OUT ................................................5-1
5.2 USING LANVIEW......................................................................5-2
APPENDIX B TWISTED PAIR WIRING TABLES A-1

INTRODUCTION
Page 1-1
CHAPTER 1
INTRODUCTION
Welcome to the Cabletron Systems SEH-22, SEH-24, SEH-32, and
SEH-34 10BASE-T Stackable Hub User’s Guide . This manual
explains installation instructions and provides reference information
for the SEH-22, 24, 32, and 34.
Note : The term SEH (Stackable Ethernet Hub) is used throughout this
manual when describing features and functions that are common to the
SEH-22, 24, 32, and 34.
1.1 USING THIS MANUAL
Read through this manual completely to familiarize yourself with its
content and to gain an understanding of the features and capabilities
of the SEH.A general working knowledge of Ethernet and IEEE 802.3
type data communications networks and their physical layer
components will be helpful when installing the SEH.
Chapter 1,
Introduction ,outlines the contents of this manual, briefly
describes SEH features, and concludes with a list of related manuals.
Chapter 2, Installation Requirements/Specifications , describes
installation requirements, network guidelines, and SEH operating
specifications.
Chapter 3, Installation ,contains instructions for installing your SEH
as a stackable or stand-alone hub.
Chapter 4, Connecting to the Network ,explains how to connect the
SEH to the network using the various media types.
Chapter 5, Troubleshooting, describes how to use the LANVIEW
LEDs to troubleshoot network problems.
Appendix A, Twisted Pair Wiring Tables , contains wiring pinouts
for Punch Down Block applications.

INTRODUCTION
Page 1-2
1.2 GETTING HELP
If you need additional support related to the Cabletron Systems SEH,
or if you have any questions,comments,or suggestions concerning this
manual, contact Cabletron Systems Technical Support:
By phone......................... [phone]
Monday-Friday; 8am - 8pm EST
By CompuServe
®
............ GO CTRON from any ! prompt
By Internet mail............. [email protected]
1.3 SEH OVERVIEW
The 10BASE-T SEH is a non-intelligent repeating hub that provides
front panel ports for network connections and rear panel HubSTACK
Interconnect Bus ports for stackable connections.
Figure 1-1. The SEH-24 and SEH-34
SEH-24 10BASE-T HUB WITH LANVIEW®
OUT SEH INTERCONNECT IN
EPIM-1
EPIM-2
HubSTACK 10BASE-T HUB WITH LANVIEW®
SEH-24
E
1
E
2
RCV
LNK
RCV
LNK
24X 23X 22X 21X 20X 19X 18X 17X 16X 15X 14X 13X
12X 11X 10X 9X 8X 7X 6X 5X 4X 3X 2X 1X
24 23 22 21 20 19 18 17 16 15 14 13
12 11 10 9 8 7 6 5 4 3 2 1
PWR
MGMT
CLN
SEH-34 10BASE-T HUB WITH LANVIEW®
OUT SEH INTERCONNECT IN
EPIM-1
EPIM-2
HubSTACK 10BASE-T HUB WITH LANVIEW®
SEH-34
E
1
E
2
RCV
LNK
RCV
LNK
24 23 22 21 20 19 18 17 16 15 14 13
12 11 10 9 8 7 6 5 4 3 2 1
PWR
MGMT
CLN 12X 1X
24X 13X

INTRODUCTION
Page 1-3
You can stack together up to five SEH hubs using Cabletron Systems’
external HubSTACK Interconnect cables. If you want to add
management to the stack, Cabletron Systems offers the MicroMMAC
and the SEHI intelligent hubs.You can stack up to four SEHs with
one intelligent hub. Stackable configurations let you maintain only
one IEEE repeater hop while providing up to 130 Ethernet ports.
The SEH-22/24 and SEH-32/34 are functionally identical with the
exception of the network ports:
• SEH-22 , 12 RJ45 network ports and one EPIM port.
• SEH-24 , 24 RJ45 network ports and two EPIM ports.
• SEH-32 , one 50 pin Champ connector, providing 12 twisted
pair segments, and one EPIM port.
•
SEH-34 , two 50 pin Champ connectors, providing 24 twisted
pair segments, and two EPIM ports.
1.4 SEH FEATURES
Repeater Functionality
The SEH 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 SEH transmits re-timed data packets,regenerates the
preamble, extends fragments, and arbitrates collisions.
The SEH automatically partitions problem segments, and reconnects
repaired segments to the network.This feature minimizes the impact
on network operation 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 that allows the SEH to pass data regardless of
the polarity of the twisted pair segment’s receive link.We do not
recommend operating in this condition. If you discover this condition,
remove the segment from the network and wire it correctly.This
reduces the potential for problems if equipment changes are made.