Cabletron Systems TRMIM 24A, TRXMIM 44A, TRXI 22A, TRXI-42A User Manual

TRXI-22A, TRXI-24A, TRXI-42A,

AND TRXI-44A ACTIVE

TOKEN RING INTELLIGENT HUB

USER’S GUIDE

CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-0505

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: 9031079 May 94

TRXI-22A, TRXI-24A, TRXI-42A, TRXI-44A,

Systems, Inc.

SPECTRUM, LANVIEW

Cabletron Systems, Inc.

IBM

is a registered trademark of International Business Machines Corporation.

DEC, VT200 CompuServe

, and

is a trademark of Compuserve, Inc.

, and

Remote LANVIEW

VT300

are trademarks of Digital Equipment Corporation.

Printed On

and

TPIM

are trademarks of Cabletron

are registered trademarks of

Recycled Pape

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.

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.

NOTICE

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.

EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY

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For Department of Defense units, the product is licensed with “Restricted Rights” as defined in the DoD Supplement to the Federal Acquisition Regulations, Section 52.2277013 (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

iii

TABLE OF CONTENTS

CHAPTER 1 INTRODUCTION

1.1 USING THIS MANUAL............................................................1-1

1.2 GETTING HELP........................................................................1-2

1.3 TRXI ACTIVE CONCENTRATOR OVERVIEW...................... 1-2

1.4 TRXI FEATURES......................................................................1-3

1.5 REMOTE NETWORK MANAGEMENT CAPABILITIES ...... 1-6

1.6 RECOMMENDED READING................................................... 1-6

CHAPTER 2 REQUIREMENTS/SPECIFICATIONS

2.1 CABLE SPECIFICATIONS.......................................................2-1

2.1.1 UTP Cable Specifications for the TRXI-22A/24A

Lobe Ports and TPIM-T2..............................................2-2

2.1.2 STP Cable Specifications For The TRXI-42A/44A

Lobe Ports and TPIM-T1/T4.........................................2-4

2.1.3 Mixed Cable Types........................................................2-6

2.1.4 Multimode Fiber Optic Cable Specifications for

the TPIM-F2.................................................................. 2-7

2.1.5 Single Mode Fiber Optic Cable Specifications for

the TPIM-F3.................................................................. 2-8

2.2 CABLE RECOMMENDATIONS/TROUBLESHOOTING.......2-9

2.3 COM 1/COM 2 PORT SPECIFICATIONS..............................2-11

2.4 TPIM SPECIFICATIONS........................................................ 2-12

2.5 GENERAL SPECIFICATIONS...............................................2-17

CHAPTER 3 INSTALLATION

3.1 UNPACKING THE TRXI..........................................................3-1

3.2 ATTACHING THE STRAIN RELIEF BRACKET ...................3-1

3.3 INSTALLING THE TRXI..........................................................3-2

3.3.1 Rack Mounting the TRXI..............................................3-3

3.3.2 Wall Mounting the TRXI..............................................3-4

3.3.3 Free-Standing Installation...........................................3-5

3.4 SETTING THE RING SPEED SWITCH.................................. 3-6

3.5 SETTING THE NVRAM SWITCH ...........................................3-7

3.6 CONNECTING THE TRXI TO THE POWER SOURCE.........3-8

3.7 CONNECTING THE NETWORK LOBE PORT CABLING....3-8

3.8 INSTALLING THE TPIM RI/RO MODULES........................3-11

CONTENTS

3.8.1 Setting the TPIM’s Phantom Switch and

RI/RO Switch...............................................................3-12

3.8.2 Installing a TPIM to the TRXI....................................3-13

3.8.3 Connecting a Twisted Pair Segment to

the TPIM-T1 ................................................................3-14

3.8.4 Connecting a Twisted Pair Segment to

the TPIM-T2 or TPIM-T4............................................3-15

3.8.5 Connecting a Fiber Optic Link Segment to

the TPIM-F2 or TPIM-F3............................................3-16

3.9 FINISHING THE INSTALLATION........................................3-18

CHAPTER 4 TESTING AND TROUBLESHOOTING

4.1 CHECKING THE INSTALLATION..........................................4-1

4.2 USING LANVIEW LEDs...........................................................4-2

4.3 USING THE LCD DISPLAY .....................................................4-3

4.3.1 Static System Messages................................................4-4

4.3.2 Alarm Messages.............................................................4-5

4.3.3 Unsaved Initialization Messages..................................4-6

4.3.4 Saved System Messages................................................4-7

CHAPTER 5 LOCAL MANAGEMENT

5.1 MANAGEMENT TERMINAL REQUIREMENTS...................5-2

5.1.1 Attaching the Management Terminal..........................5-2

5.1.2 Setting the Management Terminal Setup

Parameters.....................................................................5-3

5.1.3 Modem Cable Configuration and Setup.......................5-4

5.2 ACCESSING LOCAL MANAGEMENT....................................5-5

5.3 USING LOCAL MANAGEMENT..............................................5-6

5.3.1 The System Level Screen..............................................5-8

5.3.2 The SNMP Community Names Screen......................5-13

5.3.3 The SNMP Traps Screen.............................................5-15

5.3.4 The Ring Security Screen............................................5-17

5.3.5 The Device Statistics Screen.......................................5-22

5.3.6 The Chassis Status View Screen................................5-28

5.3.7 The Component Status View Screen..........................5-30

5.3.8 The SNMP Tools Screen..............................................5-31

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

and TRXI-44A Active Token Ring Intelligent Hub User’s Guide

This manual provides installation instructions, network requirements, and reference information for the TRXI Active stand-alone concentrator. You should have an understanding of Token Ring (IEEE 802.5) type data communications networks and their physical layer components before installing the TRXI.

Note

: This manual uses the term TRXI to describe the TRXI -22A, 24A,

42A, and 44A unless otherwise specified.

1.1 USING THIS MANUAL

The following summary provides information about each chapter in this manual. Read through the summary to familiarize yourself with this manual’s organization and content.

Chapter 1, describes features of the TRXI. It also lists recommended reading for implementing a Token Ring network.

Chapter 2, requirements, network guidelines, and TRXI operating speciﬁcations.

Introduction

Requirements/Speciﬁcations

, outlines the contents of this manual and

TRXI-22A, TRXI-24A, TRXI-42A,

, describes cabling

Chapter 3, TRXI and connecting it to the network using the various media types. This chapter includes instructions for setting the Ring Speed Switch, setting the NVRAM Switch, installing the TPIMs, and setting the TPIM Phantom Switch.

Chapter 4, testing the TRXI after installation, a description of the LANVIEW® LEDs, and explains the front panel LCD display.

Chapter 5, Management. It also describes each of the Local Management screens and the available commands.

Installation

T esting and Troubleshooting,

Local Management,

, contains instructions for installing your

describes how to access Local

contains procedures for

Page 1-1

INTRODUCTION

1.2 GETTING HELP

If you need additional support related to the Cabletron Systems TRXI, 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

1.3 TRXI ACTIVE CONCENTRATOR OVERVIEW

The TRXI stand-alone concentrator provides 12 or 24 RJ45 active Trunk Coupling Units (TCUs) for Shielded Twisted Pair (STP) or Unshielded Twisted Pair (UTP) network lobe connections. The TRXI-22A, 24A, 42A, and 44A are functionally identical with the exception of the TCU lobe ports. Cabletron offers the following TRXI conﬁgurations:

TRXI-22A

•

, twelve active RJ45 TCU lobe ports that support

category 3, 4, and 5 UTP cabling.

•

TRXI-24A

, twenty-four active RJ45 TCU lobe ports that

support category 3, 4, and 5 UTP cabling.

•

TRXI-42A

, twelve active RJ45 TCU lobe ports that support

IBM Type 1, 2, 6, and 9 STP cabling.

•

TRXI-44A

, twenty-four active RJ45 TCU lobe ports that

support IBM Type 1, 2, 6, and 9 STP cabling.

TRXI-24A TOKEN RING HUB WITH LANVIEW®

PWR

DISPLAY

RESET

COM 2 COM 1

CPU

Page 1-2

24 23 22 21 20 19

18 17 16 15 14 13

12 11 10 9 8 7

ACT

MGMT16 Mb/s

6 5 4 3 2 1

24 23 22 21 20 19

12 11 10 9 8 7

Figure 1-1. The TRXI-24A

18 17 16 15 14 13

6 5 4 3 2 1

INTRODUCTION

You can upgrade the TRXI-22A and TRXI-42A to twenty-four ports using a twelve port upgrade kit available from Cabletron Systems (Cabletron Part Number TRXI-24A-UGKIT or TRXI-44A-UGKIT).

The TRXI provides two additional ports for Ring In and Ring Out (RI/RO) connections. These ports support Cabletron’s Token Ring Port Interface Modules (TPIMs). TPIMs provide full repeater functionality . They are not included with the TRXI, but can be ordered separately from Cabletron. Table 1-1 lists each TPIM.

1.4 TRXI FEATURES

Active TCU Ports

The active TCU ports regenerate, reshape and ﬁlter the incoming signal permitting UTP lobe cable lengths of up to lobe cable lengths up to

Cable Signal Polarity

Differential Manchester encoding is utilized for each of the concentrator module TCU ports. This permits passing data regardless of receive link polarity.

150 meters

at 16 Mbps ring speed.

100 meters

and STP

Note

: If a reversed polarity condition is discovered, the segment should be removed from the network and wired correctly (according to the connector wiring shown in Chapter 2, Requirements / Speciﬁcations). This will avoid the potential for future compatibility problems.

Speed Fault Protection

If a station attempts to insert into the ring at a ring speed (4 or 16 Mbps) different from what is set on the TRXI, that port is automatically bypassed to prevent the ring from beaconing. The Lobe Port Status LED blinks indicating the port with the speed fault is bypassed.

Local Management

Local Management provides the tools to manage the TRXI and all of its attached segments. You access Local Management by connecting a Digital Equipment Corporation VT™ 320 series terminal or a PC using VT320 emulation software to the TRXI’s COM 1 port.

Page 1-3

INTRODUCTION

Token Ring Port Interface Modules

TPIMs are optional features that let you expand your trunk connections using different media types. TPIMs have embedded repeaters and retime all data. Cabletron offers a variety of TPIMs for trunk Ring In or Ring Out connections. Table 1-2 lists each TPIM.

Table 1-1. TPIMs

TPIM Media Type Connector

TPIM-T1 Shielded Twisted Pair DB9 TPIM-T2 Unshielded Twisted Pair RJ45 TPIM-T4 Shielded Twisted Pair RJ45 TPIM-F2 Multimode Fiber Optic ST TPIM-F3 Single mode Fiber Optic ST

Ring Speed Switch

The Ring Speed Switch lets you select ring speeds of either 4 Mbps or 16 Mbps. The factory default setting is 16 Mbps.

Flash EEPROMs

The TRXI uses Flash EEPROMs that allow you to download new and updated ﬁrmware using Cabletron System’s Remote LANVIEW/ Windows, version 2.3 or later or any device using BOOTP or TFTP protocols.

LANVIEW LEDs

Cabletron Systems’ LANVIEW LED Status Monitoring and Diagnostics System is a convenient troubleshooting tool that helps you diagnose power failures, RI/RO status, cable faults, ring speed, link problems, and network activity.

Cabletron’s Distributed LAN Monitor

Cabletron Systems’ Distributed LAN Monitor (DLM) is a software option for the TRXI. DLM provides a method for locally polling and monitoring devices on a local area network to minimize network management trafﬁc on an enterprise, campus, or wide area network.

Page 1-4

INTRODUCTION

RMON MIB Support

The TRXI supports the RMON MIB RFC 1271/1513 Token Ring Extensions shown in Table 1-2.

Table 1-2. RMON MIB RFC 1271/1513 Support

Group Subgroup Section

Statistics rmon 1

History rmon 2

Alarm rmon 3

Event rmon 9

Token Ring rmon 10

COM Port Applications

The front panel COM 1 port is conﬁgured to support Local Management applications. Future capabilities for TRXI’s serial ports include an SNMP proxy for Uninterruptible Power Supplies (UPS), the Serial Line Internet Protocol (SLIP), and Modem.

LCD and Reset Button

The LCD provides status information about the TRXI such as power up diagnostics, revision levels, serial numbers, and error alerts. The TRXI also has a Reset Button to initialize the processor. Both the LCD and the Reset Button are located on the front panel of the TRXI.

Token Ring ML Stats Table statistics 2

History Control Table history 1 Token Ring ML History Table history 3 Alarm Table alarm 1

Event Table event 1 Log Table event 2 Ring Station Control Table token ring 1 Ring Station Table token ring 2 Ring Station Order Table token ring 3 Ring Station Conﬁg Control Table token ring 4 Ring Station Conﬁg Table token ring 5

Page 1-5

INTRODUCTION

1.5 REMOTE NETWORK MANAGEMENT CAPABILITIES

You can control and manage the TRXI using any Simple Network Management Protocol (SNMP) software. Cabletron Systems offers the following remote management packages:

• Cabletron Systems SPECTRUM

• Cabletron Systems Remote LANVIEW®/Windows™

• Cabletron Systems Remote SPECTRUM® Portable

Management Applications

The TRXI remote network management capabilities provide the necessary management tools for the TRXI to operate at its full capacity. Your ability to set up parameters with network management ensures optimal performance of the TRXI.

1.6 RECOMMENDED READING

The following publications are recommended if more information is required on implementing a token ring network.

Local Area Networks, Token Ring Access Method, IEEE Standard 802.5 (1989)

Commercial Building Wiring Standard, EIA Standard Proposal No. 1907-B

(if approved, to be published as

EIA/TIA-568

)

LAN Troubleshooting Handbook

Publishing)

Page 1-6

, Mark Miller (1989, M&T

REQUIREMENTS/SPECIFICATIONS

CHAPTER 2

REQUIREMENTS/SPECIFICATIONS

This chapter describes cabling requirements, power requirements, and operating speciﬁcations for the TRXI. Be sure that you read this chapter before you install the TRXI. Your 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.

2.1 CABLE SPECIFICATIONS

The basic concept of a token ring is a set of Trunk Coupling Units (TCUs) connected by trunk cabling. You can extend the trunk cabling by installing TPIMs into the TRXI’s RI/RO ports. TPIMs have embedded repeaters and provide trunk connections for UTP, STP, Multimode Fiber, and Single Mode Fiber cabling.

You attach stations to the TCU lobe ports with lobe cabling. Figure 2-1 shows the various ports and cables.

TRXI-24A TOKEN RING HUB WITH LANVIEW®

Ring Out TPIM

Token Ring Station

Figure 2-1. TRXI Ports/Cables

Lobe Cabling

Ring In TPIM

TRXI-24A TOKEN RING HUB WITH LANVIEW®

TCU Lobe Ports

Trunk Cabling

Page 2-1

REQUIREMENTS/SPECIFICATIONS

2.1.1 UTP Cable Speciﬁcations for the TRXI-22A/24A Lobe Ports and TPIM-T2

The TRXI-22A and TRXI-24A lobe ports and the TPIM-T2 support voice grade Unshielded Twisted Pair (UTP) cable, as described in EIA/TIA TSB 568, and IBM Type 3 cable.

UTP consists of four pairs of 24 AWG solid wire for data or voice communication and is typically used to wire cable runs within the walls of buildings. In some installations, existing UTP building wiring can be used for token ring cabling. UTP cable must conform to the limits shown in Table 2-1.

Warning

conductors (telephone, etc.) or ground. If in doubt, test wiring before using. Telephone Battery and Ringing voltages, used in UTP telephone circuits, could present a shock hazard and can damage token ring equipment when connected to token ring cabling.

The increased popularity and cost advantages of UTP cable have driven reﬁnements to UTP cable design. As a result, better grades of UTP cable, known as supergrade or level 4, are available that exhibit improved transmission characteristics. These improved grades of UTP can often be used to permit operation at 16 Mbps on longer lobe cables.

Attenuation and Impedance

The values listed in T able 2-1 include the maximum attenuation of the cables, connectors, patch panels, and reﬂection losses due to impedance mismatches in the segment.

: DO NOT connect UTP cabling to any non-token ring network

Table 2-1. UTP Voice Grade and Category 3 Specifications

Frequency Impedance Attenuation

1 MHz 100Ω ±15% <26 dB/km (8 dB/1000 ft) 4 MHz 100Ω ±15% <56 dB/km (16 dB/1000 ft) 10 MHz 100Ω ±15% <98 dB/km (30 dB/1000 ft) 16 MHz 100Ω ±15% <131 dB/km (40 dB/1000 ft)

Page 2-2

REQUIREMENTS/SPECIFICATIONS

Maximum Lobe Lengths

The lobe length is the physical length of the cable connecting a station to its TCU port at the TRXI. Table 2-2 shows the maximum lobe length, according to ring speed. The cable lengths listed in Table 2-2 are total lengths made up of UTP cable only.

Table 2-2. UTP Maximum Lobe Lengths

UTP Cable Type Maximum Lobe Length

4 Mbps 16 Mbps

Category 3 200 meters 100 meters

(656 feet) (328 feet)

Category 4 200 meters 100 meters

(656 feet) (328 feet)

Category 5 250 meters 120 meters

(820 feet) (394 feet)

Type 3 Media Filters

To connect a UTP lobe segment from a TRXI-22A or TRXI-24A to a station supporting STP cabling, you need a Type 3 Media Filter. Cabletron Systems offers the following Type 3 Media Filters:

•

TRMF

LANVIEW

•

TRMF-2

Maximum Number of Stations

When you use UTP lobe cabling anywhere on the ring, the number of stations is limited to 4 or 16 Mbps.

, RJ45 (UTP) connector to 10-inch DB9 (STP) cable with

, RJ45 (UTP) connector to DB9 (STP) connector

150 stations

at ring speeds of either

Page 2-3

REQUIREMENTS/SPECIFICATIONS

2.1.2 STP Cable Speciﬁcations For The TRXI-42A/44A Lobe

Ports and TPIM-T1/T4

The TRXI-42A and TRXI-44A lobe ports support IBM Type 1, 2, 6, and 9 STP cabling as described below:

• IBM Type 1 - Two STP lengths of 22 AWG solid wire for data. Used for the longest cable runs within the walls of buildings.

• IBM Type 2 - Similar to Type 1 data cable, but having four additional UTP lengths of 22 A WG solid wire carried outside of the shield casing. Typically used for voice communication and often used to wire cable runs within the walls of buildings.

• IBM Type 6 - Two STP lengths of 26 AWG stranded wire for data. This type is used in patch panels or to connect devices to/from wall jacks. Attenuation for Type 6 cable is 3/2 x Type 1 cable (66 m of Type 6 =100 meters of Type 1).

• IBM Type 9 - Similar to Type 1, but uses 26 AWG solid wire. Attenuation for Type 9 cable is 3/2 x Type 1 cable (66 m of Type 9 = 100 meters of Type 1).

Attenuation and Impedance

The attenuation values shown in Table 2-3 include the attenuation of the cables, connectors, patch panels, and reﬂection losses due to impedance mismatches in the segment.

Table 2-3. STP Cable Specifications

Frequency Impedance Attenuation

Types 1 & 2

Types 6 & 9

Page 2-4

4 MHz

16 MHz

4 MHz

16 MHz

150Ω + 150Ω + 15%

150Ω + 15% 150Ω + 15%

15%

<22 dB/km (6.7 db/1000 ft.) <45 dB/km (13.7 db/1000 ft.)

<33 dB/km (10 db/1000 ft.) <66 dB/km (20 db/1000 ft.)

REQUIREMENTS/SPECIFICATIONS

Maximum Lobe Lengths

The lobe length is the physical length of the cable connecting a station to its TCU port at the TRXI. Table 2-4 shows the maximum lobe length, according to ring speed. The cable lengths listed in Table 2-4 are total lengths made up of STP cable only.

Table 2-4. STP Maximum Lobe Lengths

STP Cable Type Ring Speed

4 Mbps 16 Mbps

IBM Types 1 & 2 300 meters 150 meters

(984 feet) (492 feet)

IBM Types 6 & 9 (only for station to wall jack and patch panels)

Maximum Trunk Lengths

The maximum trunk cable length between the TRXI and another active device is equal to the maximum drive distance as shown in Table 2-5. When the neighboring token ring device is a passive device, the combined length of twice the longest trunk cable plus the longest lobe cable attached to the passive ring segment cannot exceed the Maximum Drive Distance.

Table 2-5. STP Maximum Drive Distance

STP Cable Type Ring Speed

IBM Types 1 & 2 770 meters 346 meters

IBM Types 6 & 9 513 meters 230 meters

Maximum Number of Stations

When you use STP lobe cabling everywhere on the ring, the TRXI can support up to 250 stations at ring speeds of either 4 or 16 Mbps.

30 meters 30 meters (99 feet) (99 feet)

4 Mbps 16 Mbps

(2525 feet) (1138 feet)

(1683 feet) (755 feet)

Page 2-5

REQUIREMENTS/SPECIFICATIONS

2.1.3 Mixed Cable Types

If you mix cable types in your installation, you must compensate for the different cable attenuations. Type 6 and Type 9 cables can be run for only 2/3 the distance of Type 1. This means:

10 meters (Type 1) ≈ 6.6 meters (Types 6, 9)

Example: Maximum Length for Mixed Cabling Installation

- 16 Mbps ring speed and 130 stations.

- The building has 60 meters of Type 1 cable in the wall.

- How much Type 6 cable is available to connect the repeater

TCU port to the patch panel and the station to the local wall jack?

- Type 6 can only go 2/3 the distance of Type 1.

Solution:

100 meters = maximum cable length if only Type 1 cable is used [60 meters of Type 1] + [40 meters of Type 1] = max. length [60 meters of Type 1] + [(.66) x (40 meters) of Type 6] = max. length

| |

26.4 meters of Type 6 (for patch panel and wall jack connections)

Page 2-6

REQUIREMENTS/SPECIFICATIONS

2.1.4 Multimode Fiber Optic Cable Speciﬁcations for the

TPIM-F2

Table 2-6 shows Multimode Fiber Optic Cable speciﬁcations for the TPIM-F2.

Table 2-6. Multimode Fiber Optic Cable Specifications

Cable Type Attenuation Maximum Drive Distance

50/125 µm 13.0 dB or less The maximum allowable fiber op-

62.5/125 µm 16.0 dB or less 100/140 µm 19.0 dB or less

Maximum Trunk Lengths

The maximum trunk cable length between the TRXI and another active device is equal to the maximum drive distance as shown in Table 2-6. When the neighboring token ring device is a passive device, the combined length of twice the longest trunk cable plus the longest lobe cable attached to the passive ring segment cannot exceed the Maximum Drive Distance Trunk Length.

tic cable length is 2 km (2187.2 yards). However, IEEE 802.5 specifications allow for a maximum of 1 km (1093.6 yards).

Attenuation

The ﬁber optic cable must be tested with a ﬁber optic attenuation test set that is adjusted for an 850 nm wavelength. This test veriﬁes that the signal loss in a cable is within an acceptable level. Table 2-6 shows the attenuation for each Multimode cable type.

Fiber Optic Budget

When determining the maximum ﬁber optic cable length, the ﬁber optic budget delay should be calculated and taken into consideration 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.

Page 2-7

REQUIREMENTS/SPECIFICATIONS

2.1.5 Single Mode Fiber Optic Cable Speciﬁcations for the TPIM-F3

Table 2-7 shows Single Mode Fiber Optic Cable speciﬁcations for the TPIM-F3.

Table 2-7. Single Mode Fiber Optic Cable Specifications

Cable Type Attenuation Maximum Drive Distance

8/125-12/125 µm 10.0 dB or less The max. allowable fiber optic

cable length is 2 km (2187.2 yards). However, IEEE 802.5 specs allow for a max. of 1 km (1093.6 yards).

Maximum Trunk Lengths

The maximum trunk cable length between the TRXI and another active device is equal to the Maximum Drive Distance as shown in Table 2-7. When the neighboring token ring device is a passive device, the combined length of twice the longest trunk cable plus the longest lobe cable attached to the passive ring segment cannot exceed the Maximum Drive Distance Trunk Length.

Attenuation

The ﬁber optic cable must be tested with a ﬁber optic attenuation test set that is adjusted for a 1300 nm wavelength. This test veriﬁes that the signal loss in a cable is within an acceptable level of 10 dB or less for any given single mode ﬁber optic link.

Fiber Optic Budget

Fiber optic budget is the combination of the optical loss due to the ﬁber optic cable, in-line splices, and ﬁber optic connectors. When determining the maximum ﬁber optic cable length, the ﬁber optic budget (total loss of 10.0 dB or less between stations) and total network propagation delay should be calculated and considered before ﬁber optic cable runs are incorporated in any network design.

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REQUIREMENTS/SPECIFICATIONS

2.2 CABLE RECOMMENDATIONS/TROUBLESHOOTING

The following sections describe common cable problems and recommendations for correcting them.

Crosstalk

Crosstalk is interference caused by signal coupling between the different cable pairs contained within a multi-pair cable bundle. Multi-pair cables should not be used for UTP lobe cabling. UTP lobe cabling should be dedicated to carrying token ring trafﬁc. 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. If noise induced errors are suspected, it may be necessary to reroute cabling away from potential noise sources (motors, switching equipment, ﬂuorescent lighting, high amperage equipment), or to ensure that the electrical wiring in the area is properly wired and grounded.

Temperature

The attenuation of PVC insulated cable varies signiﬁcantly with temperature. Plenum-rated cables are strongly recommended at temperatures greater than 40˚C to ensure that cable attenuation remains within speciﬁcation. Check the cable manufacturer’s speciﬁcations.

In addition to complying with the preceding cable speciﬁcations, the following recommendations should be followed to minimize errors and help to obtain optimum performance from your network:

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

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

• Metal troughs, ducts, etc . carrying token ring signals should be properly grounded.

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REQUIREMENTS/SPECIFICATIONS

• Token ring signals should not be routed through copper 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 that 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 or 22 to 24 A WG wire from the attaching device and the TCU port.

• When possible, use dedicated UTP cable for token ring signals.

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REQUIREMENTS/SPECIFICATIONS

2.3 COM 1/COM 2 PORT SPECIFICATIONS

The RJ45 COM 1 and COM 2 ports support Console, Modem, UPS, and SLIP applications. A description of each COM port application is listed below:

Note: Console is the only COM port application available at this time. Modem, UPS, and SLIP applications will be available in future TRXI releases.

TRXI-24A TOKEN RING HUB WITH LANVIEW®

RESET

DISPLAY

COM 2

COM 1

Figure 2-2. COM 1/COM 2 Ports

Console

The COM 1 port, as default, supports access to a Local Management Console. The console supports a Digital Equipment Corporation VT 320™ terminal or PC emulation of the VT 320 terminal.

Modem

Both the COM 1 and COM 2 ports support access to Local Management using a modem.

UPS

The COM 2 port supports an Uninterruptible Power Supply (American Power Conversion only).

SLIP

The COM 1 and COM 2 ports support the Serial Line Internet Protocol.

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REQUIREMENTS/SPECIFICATIONS

2.4 TPIM SPECIFICATIONS

TPIMs provide Ring In/Ring Out (RI/RO) connections that let you extend your network using a variety of media. Each TPIM has an embedded repeater that retimes all data.

The LNK (Link) LED on each TPIM provides the following information:

• Green - RI or RO active

• Red (TPIM-T1/T2/T4 only) - No Link (Autowrapped)

• Off - No Link (Wrapped or Disabled)

The following sections describe each TPIM.

TPIM-T1

The TPIM-T1 is a female DB9 connector that supports STP cabling. Figure 2-3 shows TPIM-T1 pinouts for Ring Out and Ring In applications.

Page 2-12

5 4 3 2 1

LNK

9 8 7 6

TPIM-T1

RING OUT

1. Transmit +

2. Ground

3. +5V at 250 mA

4. Ground

5. Receive -

6. Transmit -

7. Ground

8. Ground

9. Receive +

RING IN

1. Receive +

2. Ground

3. +5V at 250 mA

4. Ground

5. Transmit -

6. Receive -

7. Ground

8. Ground

9. Transmit +

Figure 2-3. TPIM-T1 Pinouts

REQUIREMENTS/SPECIFICATIONS

TPIM-T2

The TPIM-T2 is an RJ45 connector that supports UTP cabling. Figure 2-4 shows pinouts for Ring Out and Ring In applications.

1 2 3 4 5 6 7 8

LNK

TPIM-T2

RING OUT

1. Not Used

2. Not Used

3. Receive -

4. Transmit +

5. Transmit -

6. Receive +

7. Not Used

8. Not Used

RING IN

1. Not Used

2. Not Used

3. Transmit -

4. Receive +

5. Receive -

6. Transmit +

7. Not Used

8. Not Used

Figure 2-4. TPIM-T2 Pinouts

TPIM-T4

The TPIM-T4 is an RJ45 connector that supports STP cabling. Figure 2-5 shows pinouts for Ring Out and Ring In applications.

1 2 3 4 5 6 7 8

LNK

TPIM-T4

RING OUT

1. Not Used

2. Not Used

3. Receive -

4. Transmit +

5. Transmit -

6. Receive +

7. Not Used

8. Not Used

RING IN

1. Not Used

2. Not Used

3. Transmit -

4. Receive +

5. Receive -

6. Transmit +

7. Not Used

8. Not Used

Figure 2-5. TPIM-T4 Pinouts

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REQUIREMENTS/SPECIFICATIONS

TPIM-F2

The TPIM-F2 shown in Figure 2-6 is an ST connector that supports Multimode ﬁber Optic cabling.

LNK

TPIM-F2

Figure 2-6. The TPIM-F2

Note: The transmitter power levels and receive sensitivity levels given are Peak Power Levels after optical overshoot. A Peak Power Meter must be used to correctly compare the values given to those measured on any particular port. If Power Levels are being measured with an Average Power Meter, then 3 dBm must be added to the measurement to correctly compare those measured values to the values listed (i.e. -30.5 dBm peak=-33.5 dBm average).

Parameter Typical Worst Worst Case Typical

Value Case Budget Budget

Receive Sensitivity: -30.5 dBm -28.0 dBm — —

Peak Input Power: -7.6 dBm -8.2 dBm — —

Transmitter Power

50/125 µm fiber: -13.0 dBm -15.0 dBm 13.0 dB 17.5 dB

62.5/125 µm

fiber: -10.0 dBm -12.0 dBm 16.0 dB 20.5 dB 100/140 µm

fiber: -7.0 dBm -9.0 dBm 19.0 dB 23.5 dB Error Rate: Better than 10

-10

Page 2-14

REQUIREMENTS/SPECIFICATIONS

TPIM-F3

The TPIM-F3 shown in Figure 2-7 is an ST connector that supports Single Mode ﬁber Optic cabling.

LNK

TPIM-F3

Figure 2-7. The TPIM-F3

Note: Transmitter Power decreases as temperatures rise and increases as temperatures fall. Use the Output Power Coefficient to calculate increased or decreased power output for your operating environment.

For example, the typical power output at 25

C is -16.4 dBm. For a 4°C temperature increase, multiply the typical coefficient (-0.15 dBm) by four and add the result to typical output power (4 x -0.15 dBm + -16.4 = -17.0).

Maximum Sensitivity (-36.0)

Receive

Sensitivity

Maximum

Receive

Input Power

Typical Sensitivity (-31.0) Minimum Sensitivity (-30.0)

Minimum Receive Input (-9.72)

Typical Receive Input (-7.5) Maximum Receive Input (-6.99)

Transmitter Power*

(At 25°C into

8.3/125µm fiber)

-40 -35 -30 -25 -20 -15 -10 -5 0

dBm

Less Power

* Transmit Power Typical Power Minimum Power Maximum Power Coefficient (See Note Below)-0.15dBm/ °C  -0.12 dBm/ °C-0.18 dBm/ ° 

Maximum Transmit Power (-12.0)

Typical Transmit Power (-15.5)

Minimum Transmit Power (-21.0)

More Power

Page 2-15

REQUIREMENTS/SPECIFICATIONS

Parameter Typical Minimum Maximum

Transmitter Peak Wave Length 1300 nm 1270 nm 1330 nm

Spectral Width 60 nm - 100 nm Rise Time/ 3.0 nsec 2.7 nsec 5.0 nsec

Fall Time 2.5 nsec 2.2 nsec 5.0 nsec Duty Cycle 50.1% 49.6% 50.7% Bit Error Rate: Better than 10

-10

Note: The transmitter power levels given above are Peak Power Levels after optical overshoot. You must use a Peak Power Meter to correctly compare the values given above to those measured on any particular port. If you are measuring power levels with an Average Power Meter, add 3 dBm to the average power measurement to correctly compare the average power values measured to the values listed above (i.e., -33.5 dBm average + 3 dB = -30.5 dBm peak).

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