Cabletron Systems 42, STHI-44, 24, STH-22 User Manual

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STH-22/-24/-42/-44

STACKABLE TOKEN RING HUB

USER’S GUIDE

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005

NOTICE

per

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.

Order Number: 9031319 February 1996

STH, HubSTACK

Inc.

SPECTRUM, LANVIEW,

trademarks of Cabletron Systems, Inc.

IBM

is a registered trademark of International Business Machines

Corporation.

CompuServe DEC

and

VT100

Windows

is a registered trademark of Microsoft Corporation.

, and

MicroMMAC

and

Remote LANVIEW

is a registered trademark of CompuServe, Inc.

are trademarks of Digital Equipment Corporation.

Printed On

are trademarks of Cabletron Systems,

, are registered

Recycled Pa

iii

NOTICE

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

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

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 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 WARRANTEES IN SOME INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.

NOTICE

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

vii

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

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

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

Ring Hub User’s Guide

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.

. The STH (Stackable Token Ring Hub) is a non-

STH-22/-24/-42/-44 Stackable Token

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, brieﬂy describes STH features, and concludes with a list of related manuals.

Chapter 2, installation requirements, network guidelines, and STH operating speciﬁcations.

INTRODUCTION

REQUIREMENTS & SPECIFICATIONS

, outlines the contents of this manual,

, describes

Chapter 3,

Chapter 4, LEDs to troubleshoot network problems.

INSTALLATION

TROUBLESHOOTING

, contains instructions for installing the STH.

, describes how to use the LANVIEW

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

Page 1-1

STH Overview

Connector Ports (TCUs) for connections to stations and other network devices.

HubSTACK

STH-24

TOKEN RING HUB with LANVIEW

SUPPORTING 100 OHM UTP CABLE

TOKEN RING HUB with LANVIEW

RESERVED

STACK

24X 23X 22X 21X 20X 19X

PWR

4M 16M

16Mb/s

STACK

SPEED

12X 11X 10X 9X 8X 7X

18X 17X 16X 15X 14X 13X

6X 5X 4X 3X 2X 1X

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.

Page 1-2

LANVIEW LEDs

1.2.1 LANVIEW LEDs

Cabletron Systems’ LANVIEW Status Monitoring and Diagnostics System is a troubleshooting tool. Conveniently located on the front panel, LANVIEW LEDs help the user to quickly identify power failures, beaconing conditions, cable faults, and link problems.

Refer to Section 4.1, LANVIEW LED visual status monitoring system.

1.2.2 TCU Ports

Each STH, depending on the STH model (see Table 1-1. ), is equipped with 12 or 24 TCU ports, each ﬁtted with a female RJ45 modular connector jack to support the attachment of either STP (shielded twisted pair) or UTP (unshielded twisted pair) cabling with RJ45 connector plugs. Models that support STP cabling use RJ45 connectors that provide a grounded connection for the cabling shield.

Table 1-1. Port and Media List for

Lobe Port and Multiple Ring Out Port Configurations

Each TCU port on the STH is internally defaulted to operate as a lobe interface to support the insertion of a Token Ring station into a ring. However, each TCU port may also be reconﬁgured, via the intelligent hub’s Local Management (LM) application, to function as a Ring Out port to support the connection of non-intelligent, passive MAU (Multi-Station Access Unit) workgroups. See Section 1.2.4,

Workgroups

LANVIEW LED Signals

STH

-22 12 - Unshielded RJ45 ports

STH

-24 24 - Unshielded RJ45 ports

STH

-42 12 - Shielded RJ45 ports

STH

-44 24 - Shielded RJ45 ports

for more information on the

Support for Passive MAU

STH

Models

Ring Speed Fault Protection

STH hubs also provide Ring Speed Fault Protection on each TCU port to protect against beaconing conditions caused by stations inserted at the

Page 1-3

Automatic Beacon Recovery Process

wrong ring speed. If a ring speed mismatch is detected, the STH disables the port to keep the misconﬁgured station isolated from the ring and provides a simple visible LED signal (blinking red at the port’s LED) to indicate to the user that Speed Fault Protection has disabled the port. The port remains disabled until the ring speed mismatch condition is removed or resolved.

Active Circuitry

On each TCU port, STH hubs provide active circuitry which ﬁlters, equalizes, and ampliﬁes all received signals before transmitting them to the next point on the ring. The result is enhanced signal integrity and extended maximum station lobe cable distances.

Daughter Board Upgrade Kit

Both the STH-22 and the STH-42 can be upgraded to 24 ports using the following daughter board upgrade kits:

• TR-UTP-UGKT for STH-22.

• TR-STP-UGKT for STH-42.

1.2.3 Automatic Beacon Recovery Process

To guard against interruptions in network operations due to beaconing conditions, the STH supports Cabletron Systems’ advanced Automatic Beacon Recovery Process which automatically partitions problematic lobes from the ring, allowing the rest of the ring to continue operating. (ABRP engages even before the IEEE standard beacon recovery process begins and is able to treat conditions beyond the scope of the IEEE process.) It is the stack’s intelligent hub that actually executes the ABRP algorithm. The intelligent hub also checks partitioned lobes periodically and re-enables them automatically once they have recovered.

1.2.4 Support for Passive MAU Workgroups

Whereas a station signals a TCU to open its interface by sending a phantom current down its lobe cable, a passive Multi-Station Access Unit can not provide phantom current. A TCU Ring Out port is therefore conﬁgured to ignore the absence of phantom current in the connecting cable and to look instead for the presence of data bits to determine link status.

Page 1-4

Related Manuals

By default, each of the STH hub’s TCU ports is conﬁgured to its STN (station) setting to support concentrator lobe connections to stations. Through Local Management, any TCU port may be reconﬁgured to its RO (Ring Out) setting to support connections to passive MAU (MultiStation Access Unit) workgroups.

Improved Protection from Beaconing

The STH provides enhanced reliability for existing networks which use passive MAUs because Multiple Ring Out TCUs allow for the separate attachment of each MAU. Rather than daisy-chaining MAUs together as a single entity and risking their collective isolation in case of beaconing, the user can now attach each MAU individually, reducing the number of MAU ports that are at risk of collective isolation in case of beaconing on the ring; ABRP is able to bypass individually connected MAUs on an individual rather than collective basis. See Figure 1-2.

No Connection Redundancy

The STH hub’s Ring Out TCU conﬁguration does not provide for the MAU’s redundant connection to the ring. In the common conﬁguration, a MAU chain is dual-attached to the Token Ring LAN via both a Ring Out cable and a Ring In cable. Using a TCU port, however, each passive MAU workgroup is physically connected to the hub in the same manner as a station—by a single cable—and therefore is not provided a backup path between the MAU and the Token Ring network. Only the dual attachment of Ring In This level of connectivity must be provided by a dedicated pair of Ring In / Ring Out ports such as those available on the intelligent hub.

and

Ring Out cables can provide a backup path.

1.3 Related Manuals

Use the

User’s Guide

technical data provided in this manual.

STHi User’s Guide

(PN 9031320) to supplement the procedures and other

(PN 9031390) and the

MicroMMAC-xxT

Page 1-5

Related Manuals

DAISY-CHAIN MAU CONFIGURATION

When MAUs are daisy-chained,

they are connected as single collective entity.

The entire chain must be bypassed

to isolate the hub from a single beaconing station.

All stations lose connection if beaconing occurs on any station.

Ring

Out

Ring

Hub with

Ring

Access Units

Multi-Station

Ring

(8 Stations)

Ring In / Ring Out

RING OUT TCU MAU CONFIGURATION

When each MAU is individually connected to the STH hub,

only one MAU must be bypassed

to isolate the hub from a beaconing MAU station.

The 8 stations on that MAU still go down,

but the remaining MAUs and their stations stay operational.

Ring

Out

Ring

Out

Ring

Out

Ring

Out

STH TCUs

Ring

(8 Stations)

Ring Out

Access Units

Multi-Station

Figure 1-2. Improved Beacon Recovery Resolution for MAUs

Page 1-6

Getting Help

1.4 Getting Help

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

By phone: (603) 332-9400

Monday-Friday; 8am - 8pm EST

By CompuServe®: GO CTRON from any ! prompt

By Internet mail: support@ctron.com

By Fax: (603) 337-3075

By BBS: (603) 337-3750

By mail: Cabletron Systems, Inc.

P.O. Box 5005 Rochester, NH 03866-5005

Page 1-7

CHAPTER 2

REQUIREMENTS & SPECIFICATIONS

This chapter describes network guidelines, power requirements, and operating speciﬁcations for the STH. Before installing the STH, read this chapter and conﬁrm that the network meets the requirements and conditions speciﬁed in this chapter. Failure to follow these guidelines could result in poor network performance.

2.1 General Considerations

All devices connected to the STH must meet IEEE 802.5 Token Ring speciﬁcations.

Maximum Number of Stations on a Ring

The maximum stack composed of four 24-port STH hubs and one 24-port intelligent hub offers a total of 120 TCU ports, but the number of ports available on the LAN may be increased by the use of passive Multistation Access Units (MAUs) (refer to Section 1.2.4,

Passive MAU Workgroups

stations in a single ring is 250 stations when using STP lobe cabling and 150 stations when using UTP cabling anywhere on the ring.

). The recommended maximum number of

Support for

Crosstalk

Crosstalk is interference caused by signal coupling between different cable pairs contained within a multi-pair cable bundle. Multi-pair cables should not be used for UTP lobe cabling. Avoid mixing Token Ring signals with other applications (voice, etc.) within the same cable.

Noise

Noise can be caused by either crosstalk or externally induced impulses. Outside systems (motors, switching equipment, ﬂuorescent lighting, high amperage equipment) may produce electrical interference causing noise. The number and quality of cable connections also contribute considerably to noise levels. If noise induced errors are suspected, it may be necessary

Page 2-1

General Considerations

to re-route cabling away from potential noise sources, or to ensure that the electrical wiring in the area is properly wired and grounded, or to replace connectors along affected segments.

Temperature

The attenuation of PVC-insulated cable varies signiﬁcantly with temperature. Check the cable manufacturer’s speciﬁcations. Plenumrated cables are strongly recommended in areas where temperatures exceed 40˚C. Under such conditions, plenum-rated cables ensure that cable attenuation remains within speciﬁcations.

Installation Recommendations

In addition to complying with the cable speciﬁcations presented in Sections 2.2 and 2.3, the cabling installation should comply with the following recommendations to obtain optimum performance from the network:

• UTP cabling should be free of splices, stubs, or bridged taps.

• No more than two punch-down blocks should exist between TCU ports and wall outlets.

• Metal troughs, ducts, etc. carrying Token Ring signals should be properly grounded.

• Cables should be routed away from sources of electrical noise, such as power lines, fluorescent lights, electric motors, radio interference, and heavy machinery.

• Token Ring signals should not be routed through UTP cables that exit a building or which are adjacent to cables either exiting a building or exposed to lightning strikes and power surges.

• UTP cables that contain Token Ring signals should not be simultaneously used for applications which may impress high voltages (greater than 5 volts) with sharp rise or fall times, since the noise coupling from such signals could directly cause errors on the Token Ring network.

• For single telecommunications closet rings, lobe lengths should not exceed 100 meters of 22 to 24 AWG wire from the attaching device and the TCU port.

Page 2-2

Cable Specifications

• Where practical, dedicated cable should be used for Token Ring

signals.

• Work area wall plates and outlets used for the Token Ring network

should be clearly labeled as Token Ring network lobe connections.

2.2 Cable Specifications

Take care in planning and preparing the cabling and connections for the network. The susceptibility of the LAN’s cables to crosstalk and noise determines the network’s error rate, and thus, the reliability of data propagation on the network. The quality of the connections, the length of cables and other conditions of the installation are critical factors in determining the reliability of the network.

2.3 UTP Cabling Specifications

Both UTP supporting modules (STH-22 / 24) support D-inside wiring (DIW) voice grade Unshielded Twisted Pair (UTP) cable as described below and in Section 2.3.2, meet Token Ring network performance requirements.

EIA SP-1907B

UTP Lobe Lengths

. All category 5, all category 4, and

some

(see

, on page 5) category 3 UTP cables

2.3.1 UTP Cable Categories

Both UTP concentrator modules (STH-22 / 24) support UTP cables classiﬁed as category 3, 4, and 5.

UTP cable is categorized according to the following speciﬁcations:

Page 2-3

UTP Cable Categories

Table 2-1. UTP Cable Category Specifications

UTP Cat.

Operating

Frequency

4 MHz

Electrical

Impedance

Signal

Attenuation

per 100m

≤ 100Ω ±15% ≤ 5.6 dB ≥ 32 dB

loss

(@ ≥100m)

16 MHz ≤ 100Ω ±15% ≤ 13.1 dB ≥ 23 dB* 4 MHz ≤ 100Ω ±15% ≤ 4.3 dB ≥ 47 dB

16 MHz ≤ 100Ω ±15% ≤ 8.9 dB ≥ 38 dB 4 MHz ≤ 100Ω ±15% ≤ 4.3 dB ≥ 63 dB

16 MHz ≤ 100Ω ±15% ≤ 8.2 dB ≥ 44 dB

*below Token Ring performance requirement of ≥ 30.5 dB.

Category 3

consists of (usually) four Unshielded Twisted Pairs of 24 AWG solid wire for data or voice communication. (IBM Type 3 is coincidentally the same as UTP Category 3.) It is typically used to wire cable runs within the walls of buildings. In some installations, preexisting UTP building wiring can be used for Token Ring cabling.

Warning:

At 16 Mb/s ring speeds, some Category 3 cable does not meet the performance requirements of a Token Ring network. This may impose lower limits on lobe cable distances and ring node counts. See Table 2-1.

Categories 4 and 5

are higher quality versions of category 3. They use the same gauge of wire but demonstrate superior performance due to improvements in material quality and assembly (e.g. more twists per foot).

Warning:

Because Near-End Crosstalk (NEXT) contributes the majority of its detrimental effects near the end of a lobe cable, the quality of jumper cables and patch cables is most critical. Seek the highest practical grade. The quality of connectors and terminators is also critical.

Warning:

Telephone Battery and Ringing voltages used in UTP telephone circuits could present a shock hazard and can damage Token Ring equipment if connected to Token Ring cabling.

Page 2-4

DO NOT connect

UTP Lobe Lengths

UTP cabling to any non-Token Ring network conductors (telephone, etc.) or ground. If in doubt, test wiring before using.

2.3.2 UTP Lobe Lengths

The physical length of the cable connecting a station to a TCU port on the concentrator is referred to as the lobe length. The maximum lobe length attainable with the concentrator, under ideal conditions, is shown in Table 2-2. Cable routing, connector attenuation, noise, and crosstalk can adversely affect the maximum lobe length.

Table 2-2. UTP Maximum Lobe Lengths.

UTP

2.4.1 STP Cable Categories

The supported STP cable types meet the following speciﬁcations:

Table 2-3. STP Cable Type Specifications.

IBM

Type

Operational

Frequency

Impedance

Attenuation per...

1000 m (1000 ft)

4 MHz ≤ 150Ω ±15% ≤ 22 dB (≤ 6.7 dB)

1 & 2

16 MHz ≤ 150Ω ±15% ≤ 45 dB (≤ 13.7 dB)

4 MHz ≤ 150Ω ±15% ≤ 33 dB (≤ 10.0 dB)

6 & 9

16 MHz ≤ 150Ω ±15% ≤ 66 dB (≤ 20.0 dB)

IBM Type 1 consists of two shielded twisted pairs (STP) of 22 AWG solid wire for data. Used for the longest cable runs within the walls of buildings.

IBM Type 2 consists of six pairs of unshielded twisted pairs of 24 AWG solid wire and a shield casing. The two pairs carried within the shield casing are used to carry Token Ring data. The four pairs carried outside of the shield casing are typically used for voice communication. Type 2 is frequently used to wire cable runs within the walls of buildings.

IBM Type 6 consists of two STP of 26 AWG stranded wire for data. Because of its high attenuation, Type 6 is used only in patch panels or to connect devices to/from wall jacks. Attenuation for Type 6 cable is 3/2 x Type 1 cable (attenuation for 66 m of Type 6 = attenuation for 100 m of Type 1).

IBM Type 9 is similar to Type 1, but uses 26 AWG solid wire. Like Type 6, because of its high attenuation, Type 9 is used only in patch panels or to connect devices to/from wall jacks. Attenuation for Type 9 cable is 3/2 x Type 1 cable (66 m of Type 9 = 100 m of Type 1).

2.4.2 STP Lobe Lengths

Page 2-6

TCU Specifications

2-4. Cable routing, connector attenuation, noise and crosstalk can adversely affect the maximum lobe length.

Table 2-4. STP Maximum Lobe Lengths.

STP

Types

@ 4 Mb/s @ 16 Mb/s

meters (feet) meters (feet)

1 & 2 300 (984) 150 (492) 6 & 9 200 (656) 100 (328)

Mixed STP Cable Types

If cable types are to be mixed in the LAN, compensations must be made for the different cable attenuations. For example, Type 6 & 9 cables can be run for only 2/3 the distance of Type 1: 100 meters of Type 1 ≈ 66 meters of Types 6 or 9)

2.5 TCU Specifications

All STH models provide RJ45 TCU connectors for network connections. The STH-22/-24 supports UTP and the STH-42/-44 supports STP. Each TCU port is internally crossed-over to provide connections for straightthrough station lobe cabling.

Cable Shield*

TX+

RX-

RX+

7 6 5 4 3 2 1

MALE

RJ45

*Cable Shield not used with UTP cabling

TX-

Cable Shield*

Figure 2-1. TCU pinouts

Page 2-7

Operating Specifications

On STH models -42/-44, each RJ45 connector is encased in a metallic shield which provides a means of connection for the STP cable shield. Shield continuity is maintained by contacts within the female RJ45 that contact the metallic casing of the male RJ45 on the STP lobe cabling.

Shielded patch cables that adapt a shielded RJ45 to a Media Interface Connector (MIC) are available from Cabletron Systems in eight-foot lengths. These adapter/patch cables permit connection to an existing patch panel equipped with MICs.

2.6 Operating Specifications

Cabletron Systems reserves the right to change these speciﬁcations at any time without notice.

2.6.1 Ring Speed

The operating ring speed for the STH hub may be set via the Ring Speed Switch on the front face of the STH or by MIB commands from an intelligent hub.

If the STH hub has had no connection to any intelligent hub since powerup, the Ring Speed switch effects immediate changes in the hub’s ring speed. Under normal conditions, however (when the STH is being managed by an intelligent hub), the STH hub’s Ring Speed switch setting is read only at power-up. In order to change the STH hub’s ring speed via the Ring Speed switch, the user must change the switch setting and power-cycle the STH (unplug its power cord and plug it in again).

MIB commands from intelligent hubs override the Ring Speed switch setting. Once the switch setting has been overridden, the MIB command ring speed setting will remain in effect at all subsequent power-ups as long as the switch setting on the STH is not changed. MIB commands are accessible through the MIB Navigator screen on the intelligent hub’s Local Management application and through other SNMP network management software packages including Cabletron Systems’ Remote LANVIEW

/ Windows.

The user may cancel the MIB override and regain switch control over the STH hub’s ring speed by changing the current switch position and power-cycling the STH.

Page 2-8

Ring Sequence

Note: When cancelling a MIB override, the user may have to perform the switch and power-cycle procedure twice (as described in the steps below) to actually change the STH hub’s ring speed by the switch.

To return to switch control from an MIB overridden Ring Speed setting:

1. Regain switch control. Change the current switch setting and power- cycle the STH. Regardless of the ﬁnal desired speed, the user must toggle the switch opposite its current position and then power-cycle the STH to put a switch-position change into effect, cancelling the MIB override.

2. Select the desired ring speed. If the Ring Speed switch setting is not yet the desired setting (it may be the same as the former setting from the MIB command), the user must again change the switch setting and power-cycle the STH to complete the change from the MIBcommanded speed setting to the desired switch-set speed setting,

2.6.2 Ring Sequence

When STH hubs are stacked, they are interconnected via the intelligent hub to create a larger ring network. The ring sequence for the stations on the ring (the order in which stations are logically arranged on the ring) is determined by the physical location of each TCU connection in the stack. It progresses in ascending stack number and port number order. The sequence is changed each time a station is inserted or de-inserted from a ring.

To determine the ring sequence, consider only those ports inserted into the ring. Begin with the STH numbered lowest in the stack and list (in ascending numerical order) the number of each inserted port. Repeatedly move to the next STH and list the inserted ports in numerical order until all ports inserted into the ring have been listed. The order is continuous, wrapping directly from the stack’s last inserted port to the ﬁrst—from the bottom of the list, right back to the top.

2.6.3 Power Supply Requirements

Note: The STH has a universal power supply which will accept input power from 90 to 264 VAC, 47-63 Hz.

The power supply has two outputs of +5 volts and +12 volts. The maximum output power is 20 watts and the minimum efﬁciency is 65%

Page 2-9

Environmental Requirements

under all conditions of line at full load. The minimum and maximum load current from each output is shown below.

Table 2-5. Power Supply Loads

Output Min. Load Max. Load Max Power

+5 Volts 0.50 Amps 3.0 Amps 15 Watts

+12 Volts 0.05 Amps 1.0 Amps 12 Watts

2.6.4 Environmental Requirements

Operating Temperature: +5° to +50° C

Non-operating Temperature: -30° to +90° C

Operating Humidity: 5 to 95% (non-condensing)

2.6.5 Safety

This equipment is designed in accordance with UL478, UL910, NEC 7252(b), CSA, IEC, TUV, VDE Class A, and meets FCC Part 15, Class A limits.

Warning: It is the responsibility of the person who sells the system to which the STH will be a part to ensure that the total system meets allowed limits of conducted and radiated emissions.

2.6.6 Physical

Dimensions: 2.8H x 17.0W x 8.0D inches

(7.2 x 43.6 x 20.5 cm)

Predicted MTBF: STH-22/42: 653,987 hours

(mean time between failure) STH-24/44: 653,972 hours

Page 2-10

CHAPTER 3

INSTALLATION

This chapter outlines the procedure for installing the STH and adding it to a stack. Conﬁrm that the network meets the guidelines and requirements outlined in Chapter 2, Installation Requirements/ Speciﬁcations, before installing the STH.

3.1 Unpacking the STH

Unpack the STH as follows:

1. Carefully remove the STH from the shipping box. Preserve the shipping box and packing materials for future use.

2. Visually inspect the STH. If there are any signs of damage, contact Cabletron Systems Technical Support immediately.

3.2 Installing the STH

All installations must meet the requirements listed below:

• A single phase 120Vac, 15A, grounded power receptacle must be within 7 feet of the STH.

• Shelving units must be able to support 30 pounds of static weight per hub in the stack.

• The temperature for the selected location must be maintained between 5° and 50°C, and ﬂuctuate less than 10°C per hour.

The following sections provide instructions for stacking the STH.

3.2.1 Rack Mount or Wall Mount Hardware

Provided with the STH is an accessory kit that includes Rack Mount Brackets for installations into 19 inch racks, Wall Mount Brackets and Mounting Screws for installations on walls, and a Strain Relief Bracket to minimize stresses imﬂicted by cables hanging from the TCU ports.

Page 3-1

Adding the STH to a Stack

3.2.2 Adding the STH to a Stack

STH hubs are star-wired to the intelligent hub. To add STH hubs to a stack, refer to Figure 3-1 and perform the following steps:

1. Attach an STH HubSTACK Interconnect cable to the "STACK" port on the rear panel of an STH.

2. Attach the other end of the cable to one of the numbered STACK ports on the back panel of the intelligent hub.

The port’s number determines the relative position of the STH hub in the network’s ring sequence and is used by the intelligent hub’s management system to identify the STH to the user.

3. Repeat steps 1 and 2 to attach up to four STH hubs in the stack.

STH-24

RESERVED

STH-24

RESERVED

STH-24

RESERVED

STH-24

RESERVED

MicroMMAC-24T

TOKEN RING HUB with LANVIEW

STACK

TOKEN RING HUB with LANVIEW

STACK

TOKEN RING HUB with LANVIEW

STACK

TOKEN RING HUB with LANVIEW

STACK

TOKEN RING HUB

LANVIEW®

WITH

Figure 3-1. Stacking the STH

STACK 2STACK 1 STACK 4STACK 3

To disconnect an STH hub from the stack, simply unplug its HubSTACK Interconnect cable from the intelligent hub.

Page 3-2

Attaching the Strain Relief Bracket

3.2.3 Attaching the Strain Relief Bracket

Attach the strain relief bracket to the front of the STH as follows:

1. Locate the strain relief bracket and four 8-32 x 3/8" screws from the

STH-ACCY-KIT package.

Warning: Use of longer screws may cause damage to the unit or electrical shock.

2. Carefully turn the STH upside down.

3. Attach the strain relief bracket to the bottom of the STH as shown in

Figure 3-2.

6X 5X 4X 3X 2X 1X

18X 17X 16X 15X 14X 13X

12X 11X 10X 9X 8X 7X

24X 23X 22X 21X 20X 19X

SPEED

STACK

16Mb/s

4M 16M

PWR

STH-24

SUPPORTING 100 OHM UTP CABLE

HubSTACK

TOKEN RING HUB with LANVIEW

Figure 3-2. Attaching the Strain Relief

3.2.4 Rack-Mounting the STH

Perform these steps to install the STH in a 19-inch rack:

1. Remove the four cover screws (two from each side) located along the

front edges of each side of the STH.

2. Using the four cover screws removed in step 1, attach the rack

mounting brackets to each side of the STH as shown in Figure 3-3.

3. With the mounting brackets installed, position the STH between the

vertical frame members of the 19-inch rack and fasten it securely with the mounting screws as shown in Figure 3-4.

Page 3-3

Wall-Mounting the STH

Rack Mounting Brackets (2)

HubSTACK

STH-24

TOKEN RING HUB with LANVIEW

SUPPORTING 100 OHM UTP CABLE

PWR

4M 16M

16Mb/s

STACK

24X 23X 22X 21X 20X 19X

SPEED

12X 11X 10X 9X 8X 7X

18X 17X 16X 15X 14X 13X

6X 5X 4X 3X 2X 1X

Screws (4)

Figure 3-3. Installing the Rack-Mount Brackets

19-Inch Rack

HubSTACK

STH-24

TOKEN RING HUB with LANVIEW

SUPPORTING 100 OHM UTP CABLE

18X 17X 16X 15X 14X 13X

6X 5X 4X 3X 2X 1X

SPEED

24X 23X 22X 21X 20X 19X

12X 11X 10X 9X 8X 7X

PWR

4M 16M

16Mb/s

STACK

Screws (4)

Figure 3-4. Installing the STH in a Rack

3.2.5 Wall-Mounting the STH

When an STH is installed on a wall, its cable connections must face down to prevent the sideways stresses of hanging cables from compromising the connection at the port.

Note: 1/4-inch anchors for wall mounting are not included with the STH-ACCY-KIT package.

1. Use the supplied screws to attach the wall mounting brackets to the bottom of the STH as shown in Figure 3-5. There are two brackets, one for each side.

Page 3-4

Wall-Mounting the STH

Figure 3-5. Installing the Wall Mounting Brackets

2. Select the wall location for the STH within 7 feet of a power outlet.

Warning: There is a SHOCK HAZARD whe drilling into walls containing electrical wiring. Select a wall location where drill bits and screw anchors will not come in contact with electrical wiring in the wall.

3. Get a pencil. With the wall mounting brackets attached to the STH,

position the STH against the wall where it will be permanently mounted with the network port facing down, as shown in Figure 3-6, and mark the screw holes’ positions on the wall.

4. Set the STH aside and carefully drill four 1/4" pilot holes, one for each

screw anchor.

5. Install the screw anchors.

6. Position the STH on the wall, aligning the screw holes over the

anchors and reinstall the four anchor screws to attach the STH to the wall. Tighten the four anchor screws.

Page 3-5

Free-Standing Installation

Solid Wall Anchor

Wall Mounting Bracket

attached to STH

Mounting Screws

Pre-Drilled Holes

with Anchors

Hollow Wall Anchor

Figure 3-6. Wall-mounting the STH

3.2.6 Free-Standing Installation

For a free-standing shelf or tabletop installation, install the STH on an unrestricted free surface area 21 inches wide, 18 inches deep and 6 inches high, within 7 feet of its power source, as shown in Figure 3-7.

6 IN.

Page 3-6

18 IN.

HubSTACK

STH-24

TOKEN RING HUB with LANVIEW

SUPPORTING 100 OHM UTP CABLE

PWR

16Mb/s

4M 16M

STACK

SPEED

21 IN.

24X 23X 22X 21X 20X 19X

12X 11X 10X 9X 8X 7X

18X 17X 16X 15X 14X 13X

6X 5X 4X 3X 2X 1X

Figure 3-7. Shelf or Table-top Installation

7 FT.

Connecting the STH to the Power Source

3.2.7 Connecting the STH to the Power Source

Note: The STH has a universal power supply which will accept power sources from 90 Vac to 264 Vac, 47-63 Hz.

To connect the STH to the power source:

1. Plug the power cord into the back panel of the STH.

2. Plug the other end of the power cord into a grounded wall outlet.

3. Verify that the PWR LED is on, this indicates that the STH is receiving

power.

3.2.8 Attaching Network Cabling to TCU Ports

Twisted pair segments are connected to the RJ45 TCU Ports on the front panel of the STH. To connect twisted pair segments to the STH:

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

desired network port on the STH. See Figure 3-8.

13X

14X

15X

16X

17X

18X

Figure 3-8. TCU Port Connections

2. Confirm that the port’s corresponding LNK LED is on. If the LED is

not on, perform each of the following steps: a. Check that the Token Ring 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. Check the cable for continuity.

Page 3-7

Finishing the Installation

c. Check that the twisted pair connection meets dB loss and cable

specifications outlined Chapter 2.

If a link still has not been established, contact Cabletron Systems Technical Support.

3.3 Finishing the Installation

The STH is now ready for operation. Before placing the network into service, test the installation thoroughly, making sure that all stations are addressable and that the STH and all stations are indicating normal operation. Conﬁrm that all networking software is conﬁgured properly to match the installed network. If abnormal operation conditions emerge, proceed to Chapter 4, TROUBLESHOOTING.

Page 3-8

CHAPTER 4

TROUBLESHOOTING

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

4.1 LANVIEW LED Signals

The STH incorporates the Cabletron Systems LANVIEW Status Monitoring and Diagnostics System. LANVIEW LEDs can help diagnose problems such as a power failure or a cable fault. The STH includes the following LANVIEW LEDs:

Table 4-1. LED Signals

LED Color Condition

Green Power on.

PWR

off Power off. Yellow Ring Speed set to 16 Mbps.

16 Mb

off Ring Speed set to 4 Mbps. Green Connection with intelligent hub intact.

STACK

Red Bypassed or disconnected from intelligent hub. off Port enabled but not linked. Green Port enabled and linked.

Ports

Red Port disabled (or set to Ring Out) and not linked. Blinking

Red

Ring Speed Fault -OR- Port linked but disabled.

4.2 Trouble Resolution

If this section does not guide the user to a solution, please contact Cabletron Systems Technical Support (see Section 1.4, Getting Help.)

Page 4-1

Trouble Resolution

Loss Of Power

If the STH is having power problems, check the power delivery system (power cable, power outlet, circuit breaker, fuse).

Loss of Contact with Intelligent Hub

If the STACK LED is indicating disconnection from the intelligent hub, it may be that the intelligent hub has placed the STH in bypass to protect itself from beaconing conditions or a mismatched ring speed on the STH. Check the STH for beaconing conditions and make sure that the STH is operating at the same rings speed as the intelligent hub.

It may be that the STH is physically disconnected from the intelligent hub by a disconnected or faulty cable. Check the hardware.

Failure to Link on Enabled Port

Check that the Token Ring devices at either end of the cable are poweredup.

Verify that the network cable’s connectors have the proper pinouts. Refer to Section 2.5, TCU Specifications.

Check the cable for continuity. A variety of tools are available for this test, depending on the media you are using.

Check that the cables speciﬁcations for dB loss described in Chapter 2.

Ring Speed Fault

The network device being linked at this port is operating at a ring speed different from the STH’s currently set ring speed. Set the two devices to the same speed.

Page 4-2

Cabletron Systems 42, STHI-44, 24, STH-22 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

NOTICE

CONTENTS

INTRODUCTION

LANVIEW LEDs

1.2.2 TCU Ports

Automatic Beacon Recovery Process

1.2.4 Support for Passive MAU Workgroups

REQUIREMENTS & SPECIFICATIONS

2.3.1 UTP Cable Categories

2.3.2 UTP Lobe Lengths

2.4.1 STP Cable Categories

2.4.2 STP Lobe Lengths

2.6.1 Ring Speed

2.6.2 Ring Sequence

2.6.3 Power Supply Requirements

2.6.4 Environmental Requirements

2.6.5 Safety

2.6.6 Physical

INSTALLATION

3.2.1 Rack Mount or Wall Mount Hardware

Adding the STH to a Stack

Attaching the Strain Relief Bracket

3.2.4 Rack-Mounting the STH

Wall-Mounting the STH

Free-Standing Installation

Connecting the STH to the Power Source

3.2.8 Attaching Network Cabling to TCU Ports

TROUBLESHOOTING