Cabletron Systems 24 User manual

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005
STH-22/-24/-42/-44
STACKABLE TOKEN RING HUB
USER’S GUIDE

NOTICE
iii
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
INFORMATIONCONTAINEDINIT,EVENIFCABLETRONSYSTEMSHAS
BEEN ADVISED OF, KNOWN, OR SHOULD HAVE KNOWN, THE
POSSIBILITY OF SUCH DAMAGES.
© Copyright February 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: 9031319 February 1996
STH , HubSTACK , and MicroMMAC are trademarks of Cabletron Systems,
Inc.
SPECTRUM , LANVIEW , and Remote LANVIEW , are registered
trademarks of Cabletron Systems, Inc.
IBM is a registered trademark of International Business Machines
Corporation.
CompuServe is a registered trademark of CompuServe, Inc.
DEC and VT100 are trademarks of Digital Equipment Corporation.
Windows is a registered trademark of Microsoft Corporation.
Printed On Recycled Pa
per

NOTICE
iv
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
likelyto causeinterference inwhich casethe userwill berequired tocorrect 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.
Leprésentappareilnumérique n’émetpasdebruits radioélectriquesdépassant
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
v
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. Youhavetherightto use onlythe one (1)copy of theProgram 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
vi
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, THEACCOMPANYING 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.

NOTICE
vii
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 03866

CONTENTS
ix
CONTENTS
CHAPTER 1 INTRODUCTION
1.1 Using This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 STH Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2.1 LANVIEW LEDs . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.2 TCU Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.2.3 Automatic Beacon Recovery Process . . . . . . . . 1-4
1.2.4 Support for Passive MAU Workgroups . . . . . . 1-4
1.3 Related Manuals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1.4 Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
CHAPTER 2 REQUIREMENTS & SPECIFICATIONS
2.1 General Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Cable Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3 UTP Cabling Specifications . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3.1 UTP Cable Categories . . . . . . . . . . . . . . . . . . . . . 2-3
2.3.2 UTP Lobe Lengths . . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.4 STP Cabling Specifications . . . . . . . . . . . . . . . . . . . . . . . 2-5
2.4.1 STP Cable Categories. . . . . . . . . . . . . . . . . . . . . . 2-6
2.4.2 STP Lobe Lengths. . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.5 TCU Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.6 Operating Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.6.1 Ring Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.6.2 Ring Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.6.3 Power Supply Requirements . . . . . . . . . . . . . . . 2-9
2.6.4 Environmental Requirements . . . . . . . . . . . . . 2-10
2.6.5 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.6.6 Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

CONTENTS
x
CHAPTER 3 INSTALLATION
3.1 Unpacking the STH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Installing the STH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.2.1 Rack Mount or Wall Mount Hardware. . . . . . . 3-1
3.2.2 Adding the STH to a Stack . . . . . . . . . . . . . . . . . 3-2
3.2.3 Attaching the Strain Relief Bracket . . . . . . . . . . 3-3
3.2.4 Rack-Mounting the STH . . . . . . . . . . . . . . . . . . . 3-3
3.2.5 Wall-Mounting the STH . . . . . . . . . . . . . . . . . . . 3-4
3.2.6 Free-Standing Installation. . . . . . . . . . . . . . . . . . 3-6
3.2.7 Connecting the STH to the Power Source . . . . 3-7
3.2.8 Attaching Network Cabling to TCU Ports . . . . 3-7
3.3 Finishing the Installation . . . . . . . . . . . . . . . . . . . . . . . . 3-8
CHAPTER 4 TROUBLESHOOTING
4.1 LANVIEW LED Signals . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.2 Trouble Resolution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Page 1-1
CHAPTER 1
INTRODUCTION
Welcome to the Cabletron Systems STH-22/-24/-42/-44 Stackable Token
Ring Hub User’s Guide . The STH (Stackable Token Ring Hub) is a non-
intelligent hub designed to provide expanded connectivity for Cabletron
Systems’ STHi intelligent hubs and Cabletron Systems MicroMMAC
intelligent hubs. This manual provides installation instructions and
reference information for STH models 22, 24, 42, and 44.
Note : The term STH is used throughout this manual when describing
features and functions that are common to the above listed STH models.
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 STH. A general working knowledge of IEEE 802.5 Token Ring data
communications networks and their physical layer components will be
helpful when installing the STH.
Chapter 1, INTRODUCTION , outlines the contents of this manual,
briefly describes STH features, and concludes with a list of related
manuals.
Chapter 2, REQUIREMENTS & SPECIFICATIONS , describes
installation requirements, network guidelines, and STH operating
specifications.
Chapter 3, INSTALLATION , contains instructions for installing the STH.
Chapter 4, TROUBLESHOOTING , describes how to use the LANVIEW
LEDs to troubleshoot network problems.
1.2 STH Overview
The STH is a non-intelligent hub which provides expanded connectivity
for Cabletron Systems’ STHi intelligent hubs and Cabletron Systems
MicroMMAC intelligent hubs. Each STH added to an intelligent hub‘s
managed stack increases the LAN’s connectivity by 12 or 24 Trunk

STH Overview
Page 1-2
Connector Ports (TCUs) for connections to stations and other network
devices.
Figure 1-1. Front and Back Views of the STH-24
Up to four STH hubs can be linked to the same intelligent hub, bringing
the total direct connectivity potential to 120 managed TCU ports in the
stack. Intelligent hubs serve as the logical “top” of the stack and provide
full frame and error statistics for the collective stack, for each individual
device, and for each port. Hubs can be added to and removed from the
stack without powering-down any of the devices involved.
Cabletron’s HubSTACK Interconnect cables, Part Number 9380141, are
needed when stacking hubs.
The STH fully conforms to IEEE 802.5Token Ring specifications for
connectivity to Token Ring equipment. STH hubs offer:
• support for Cabletron Systems’ Automatic Beacon Recovery
Process (ABRP),
• Multiple Ring Out connectivity for Passive MAU workgroups,
• automatic speed fault protection,
• active filtering, re-timing, and repeating circuitry on all ports,
• and LANVIEW LEDs for “at-a-glance” diagnostic monitoring.
The STH does not have management capability and is not intended to be
used as a stand-alone device. Management must be provided by a
Cabletron Systems intelligent hub, either the STHi Stackable Token Ring
Hub with Intelligence or the MicroMMAC intelligent hub.
HubSTACK
STH-24
TOKEN RING HUB with LANVIEW®
SUPPORTING 100 OHM UTP CABLE
16Mb/s
PWR
STACK SPEED
4M 16M
STACK
RESERVED
STH-24 TOKEN RING HUB with LANVIEW®
SN
24X 23X 22X 21X 20X 19X 18X 17X 16X 15X 14X 13X
12X 11X 10X 9X 8X 7X 6X 5X 4X 3X 2X 1X