Cabletron Systems SEH-22 User Manual

SEH-22 AND SEH-24 10BASE-T

STACKABLE HUB

USER’S GUIDE

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

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.

This electric hazard symbol appears in the SEH User’s Guide. Read all instructions following this symbol. Failure to follow the instructions appearing with this symbol could result in the presence of an electric hazard which has the potential to cause injury.

SPECTRUM, LANVIEW, EPIM-C, EPIM-F1/F2/F3, EPIM-T, EPIM-X, HubSTACK, MicroMMAC, SEHI

trademarks of Cabletron Systems, Inc.

CHAMP CompuServe DEC, VT200, VT300 Ethernet IBM ST UNIX Windows

is a trademark of AMP, Inc.

is a registered trademark of CompuServe, Inc.

is a trademark of Xerox Corporation.

is a registered trademark of International Business Machines Corporation.

is a registered trademark of American Telephone and Telegraph Company

is a trademark of Unix Systems Laboratories, Inc.

is a registered trademark of Microsoft Corporation.

and

VT320

Printed On

Remote LANVIEW

are trademarks of Digital Equipment Corporation.

are registered trademarks and

Recycled Paper

EPIM-A

SEH USER’S GUIDE

and

SEH

are

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.

VCCI NOTICE

This equipment is in the 1st Class Category (information equipment to be used in commercial and/or industrial areas) and conforms to the standards set by the Voluntary Control Council for Interference by Information Technology Equipment (VCCI) aimed at preventing radio interference in commercial and/or industrial areas.

Consequently, when used in a residential area or in an adjacent area thereto, radio interference may be caused to radios and TV receivers, etc.

Read the instructions for correct handling.

SEH USER’S GUIDE

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

SEH USER’S GUIDE

iii

NOTICE

EXCLUSION OF WARRANTY

AND DISCLAIMER OF LIABILITY

1. EXCLUSION OF WARRANTY. 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.

Except as may be specifically provided by Cabletron in

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., P.O. Box 5005, Rochester, New Hampshire 03866-5005.

SEH USER’S GUIDE

TABLE OF CONTENTS

CHAPTER 1 INTRODUCTION

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

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

1.3 SEH OVERVIEW.....................................................................................1-2

1.4 SEH FEATURES.....................................................................................1-3

1.5 STACKABLE CAPABILITIES ..................................................................1-4

1.6 OPTIONAL FEATURES ..........................................................................1-4

1.7 RELATED MANUALS..............................................................................1-6

CHAPTER 2 INSTALLATION

REQUIREMENTS/SPECIFICATIONS

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

2.1.1 HubSTACK Interconnect Cable Requirements .........................2-1

2.1.2 10BASE-T UTP and STP Cable Specifications.........................2-2

2.2 NETWORK PORT SPECIFICATIONS ....................................................2-4

2.3 TRANSCEIVER REQUIREMENTS.........................................................2-4

2.4 OPERATING SPECIFICATIONS.............................................................2-5

CHAPTER 3 INSTALLATION

3.1 UNPACKING THE SEH...........................................................................3-1

3.2 INSTALLING THE SEH...........................................................................3-1

3.2.1 Tabletop or Shelf Installation.....................................................3-2

3.2.2 Rackmount Installation Requirements.......................................3-3

3.2.3 Attaching the Strain Relief Bracket............................................3-4

3.2.4 Rack Mounting the SEH............................................................3-5

3.2.5 Stacking the SEH ......................................................................3-6

3.3 CONNECTING THE SEH TO THE POWER SOURCE...........................3-9

3.4 ADDING/REPLACING EPIMs .................................................................3-9

CHAPTER 4 CONNECTING TO THE NETWORK

4.1 CONNECTING THE SEH TO THE NETWORK ......................................4-1

4.1.1 Connecting Network Ports, SEH-22 and SEH-24 .....................4-1

4.1.2 Connecting a UTP Segment to an EPIM-T ...............................4-3

4.1.3 Connecting a Fiber Segment to an EPIM-F1/F2/F3..................4-4

4.1.4 Connecting a Thin-Net Segment to an EPIM-C ........................4-6

4.1.5 Connecting an AUI Cable to an EPIM-A ...................................4-8

4.1.6 Connecting an AUI Cable to an EPIM-X ...................................4-9

4.2 FINISHING THE INSTALLATION..........................................................4-10

SEH USER’S GUIDE

CONTENTS

CHAPTER 5 TROUBLESHOOTING

5.1 INSTALLATION CHECK-OUT.................................................................5-1

5.2 USING LANVIEW ....................................................................................5-2

APPENDIX A EPIM INFORMATION

A.1 EPIM SPECIFICATIONS........................................................................ A-1

A.1.1 EPIM-T .....................................................................................A-1

A.1.2 EPIM-F1 and EPIM-F2 ............................................................. A-2

A.1.3 EPIM-F3 ...................................................................................A-3

A.1.4 EPIM-C..................................................................................... A-5

A.1.5 EPIM-A and EPIM-X (AUI Port)................................................A-6

A.2 EPIM CABLE SPECIFICATIONS ........................................................... A-7

A.2.1 Multimode Fiber Optic Cable Specifications.............................A-7

A.2.2 Single Mode Fiber Optic Cable Specifications .........................A-8

A.2.3 Thin-Net Network Requirements for the EPIM-C .....................A-9

A.2.4 AUI Cable Requirements for the EPIM-A and EPIM-X...........A-10

INDEX

SEH USER’S GUIDE

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems

Stackable Hubs User’s Guide

instructions and reference information for the SEH-22 and SEH-24.

1.1 USING THIS MANUAL

Read through this manual completely to familiarize yourself with its content and to gain an understanding of the features and capabilities of the SEH. A general working knowledge of Ethernet and IEEE 802.3 type data communications networks and their physical layer components is helpful when installing the SEH.

Chapter 1, describes SEH features, and concludes with a list of related manuals.

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

Chapter 3, stackable or stand-alone hub.

Chapter 4, to the network using the various media types.

Introduction

Installation Requirements/Speciﬁcations

Installation

Connecting to the Network

, outlines the contents of this manual, brieﬂy

, contains instructions for installing the SEH as a

SEH-22 and SEH-24 10BASE-T

. This manual provides installation

, describes

, explains how to connect the SEH

Chapter 5, to troubleshoot network problems.

Appendix A, information, and switch settings for the Ethernet Port Interface Modules.

SEH USER’S GUIDE

T r oubleshooting

EPIM Information

, describes how to use the LANVIEW LEDs

, provides speciﬁcations, cabling

1-1

CHAPTER 1:

INTRODUCTION

1.2 GETTING HELP

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

By phone ..........................(603) 332-9400

Monday-Friday; 8am - 8pm Eastern Time

By CompuServe...............GO CTRON from any ! prompt

By Internet mail ...............support@ctron.com

By FTP.............................134.141.197.25

anonymous

, Password:

your email address

1.3 SEH OVERVIEW

The SEH-22 is a non-intelligent repeating hub that has 12 RJ45 ports and one Ethernet Port Interface Module (EPIM) port on the front panel for network connections while the SEH-24 has 24 RJ45 ports and two EPIM ports on the front panel for network connections. Both models have two rear panel HubSTACK Interconnect Bus ports for stackable connections.

HubSTACK 10BASE-T HUB WITH LANVIEW® SEH-22

OUT

SEH INTERCONNECT

1491_1

Figure 1-1. Front and Rear Views of the SEH-22 and SEH-24

1-2

SEH USER’S GUIDE

SEH FEATURES

Stack up to ﬁve SEH hubs using Cabletron Systems external HubSTA CK Interconnect cables. Manage the stack by using the Cabletron Systems MicroMMAC or SEHI (Stackable Ethernet Hub with Intelligence). Up to four SEH hubs can be stacked with one intelligent hub. Stackable conﬁgurations make it possible to maintain only one IEEE repeater hop while providing up to 130 Ethernet ports.

1.4 SEH FEATURES

Repeater Functionality

The SEH fully conforms to the IEEE 802.3 Repeater, AUI, and 10BASE-T speciﬁcations, and provides the ﬂexibility to connect networks using IEEE 802.3, Ethernet Version 1 or Version 2 equipment. The SEH transmits re-timed data packets, regenerates the preamble, extends fragments, and arbitrates collisions.

The SEH automatically partitions problem segments, and reconnects repaired segments to the network. This feature minimizes the impact on network operation by isolating the problem segment. Only devices on the problem segment are affected. When the problem is solved, the SEH automatically reconnects the isolated segment to the network.

Polarity Detection and Correction

Each twisted pair port on the SEH incorporates a Polarity Detection and Correction feature that allows the SEH to pass data regardless of the polarity of the twisted pair segment’s receive link. Cabletron does not recommend operating in this condition. When this condition is discovered, remove the segment from the network and wire it correctly to reduce the potential for problems if equipment changes are made.

LANVIEW LEDs

Cabletron Systems LANVIEW Status Monitoring and Diagnostics System is a troubleshooting tool that helps in diagnosing power failures, collisions, cable faults, and link problems. The LANVIEW LEDs are located on the front panel.

SEH USER’S GUIDE

1-3

CHAPTER 1:

INTRODUCTION

1.5 STACKABLE CAPABILITIES

The SEH is a non-intelligent hub designed to be managed by a Cabletron Systems intelligent hub such as the SEHI or the MicroMMAC. Intelligent hubs serve as the logical “top” of the stack. They manage all SEH hubs in the stack, providing full packet and error statistics for the entire stack, individual device, or individual port. Stack up to ﬁve SEH hubs for a non-managed stack or one intelligent hub and up to four SEH hubs for a managed stack. Hubs can be added or removed from the stack without powering down the entire stack.

1-4

SEH USER’S GUIDE

OPTIONAL FEATURES

Table 1-2 lists the board revision requirements for EPIMs used in the SEH-24. The board revision number is located on the EPIM’s printed circuit board directly after the part number as shown in Figure 1-2.

Table 1-2. EPIM Board Revision Requirements

EPIM EPIM BOARD REVISION

EPIM-A Not Applicable EPIM-C 05 or greater EPIM-T 04 or greater EPIM-X 02 or greater EPIM-F1 05 or greater EPIM-F2 05 or greater EPIM-F3 02 or greater

EPIM Board Revision

Figure 1-2. EPIM Board Revision Number

SEH USER’S GUIDE

CABLETRON SYSTEMS INC. PN 9000474 - 04

EPIM-T

1490_2

1-5

CHAPTER 1:

INTRODUCTION

HubSTACK Interconnect Cables

Use Cabletron HubSTACK Interconnect cables to stack hubs together. Table 1-3 lists the part number and application for each cable.

Table 1-3. HubSTACK Interconnect Cables

P/N Description Application

9380110 12" HubSTACK

Interconnect Cable

9380111 18" HubSTACK

Interconnect Cable

SEH to SEH connections.

SEHI or MicroMMAC to SEH connections.

Rack Mount Capabilities

The SEH can be installed in a 19-inch rack. Cabletron offers an accessory package that includes the brackets, a strain relief for cable management and mounting screws. The part number for the accessory package is SEH-ACCY-KIT. See Chapter 3,

Installation,

for complete rack

mounting instructions.

1.7 RELATED MANUALS

Use the following Cabletron Systems manuals to supplement the procedures and other technical data provided in this manual. The procedures contained in these manuals are referenced where appropriate, rather than repeated in this manual.

SEHI-22 and SEHI-24 10BASE-T Intelligent Hub User’s Guide MicroMMAC-22E/24E and MicroMMAC-32E/34E User’s Guide

1-6

SEH USER’S GUIDE

CHAPTER 2

INSTALLATION

REQUIREMENTS/SPECIFICATIONS

This chapter describes network guidelines, power requirements, and operating speciﬁcations for the SEH. Be sure to read this chapter before you install the SEH. The 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 SEH-22 and SEH-24 network ports support Shielded Twisted Pair (STP) and Unshielded Twisted Pair (UTP) cabling.

Ethernet Port Interface Modules (EPIMs) expand a network using UTP, STP, Multimode Fiber Optic, Single Mode Fiber Optic, or Thin Coaxial cabling. For information concerning EPIMs, refer to Appendix A. The rear panel Interconnect Bus Ports support Cabletron Systems HubSTACK Interconnect cables for stackable applications.

Take care in planning and preparing the cabling and connections for the network. The quality of the connections and the length of cables are critical factors in determining the reliability of your network. The following sections describe speciﬁcations for each media type.

2.1.1 HubSTACK Interconnect Cable Requirements

Connect units in the stack with HubSTACK Interconnect cables. Refer to Chapter 1 for cable part numbers. The cables attach to the SEH rear panel bus ports.

The rear panel of the SEH has an SEH Interconnect Bus Out Port (male connector) and an SEH Interconnect Bus In Port (female connector). The bus supports ﬁve stackable devices.

SEH USER’S GUIDE

2-1

CHAPTER 2:

INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.1.2 10BASE-T UTP and STP Cable Speciﬁcations

The devices and 10BASE-T Twisted Pair Segments connected to the SEH 10BASE-T Twisted Pair Network Ports and EPIM-T module must meet the IEEE 802.3 10BASE-T speciﬁcations shown below.

Length

The IEEE 802.3 10BASE-T standard requires that 10BASE-T devices transmit over a 100 meter (328 foot) link using 22-24 AWG unshielded twisted pair wire. However, cable quality largely determines maximum link length. With high quality, lo w attenuation cable, link lengths of up to 200 meters are achievable. Cable delay limits maximum link length to 200 meters, regardless of cable type.

Insertion Loss

The maximum insertion loss allowed for a 10BASE-T link is 11.5 dB at all frequencies between 5 and 10 MHz. This includes the attenuation of the cables, connectors, patch panels, and reﬂection losses due to impedance mismatches in the link segment.

Impedance

Cabletron Systems 10BASE-T Twisted Pair products work on twisted pair cable with 75 to 165 ohms impedance. Unshielded twisted pair cables typically have an impedance of between 85 to 110 ohms.

Shielded twisted pair cables, such as IBM Type 1 cable, can also be used. The impedance of IBM Type 1 cable is typically 150 ohms. This increases the signal reﬂection caused by the cable, but because the cable is shielded, this signal reﬂection has little effect on the receiv ed signal’ s quality due to the lack of crosstalk between the shielded cable pairs.

Jitter

Intersymbol interference and reﬂections cause jitter in the bit cell timing, resulting in data errors. A 10BASE-T link must not generate more than

5.0 ns of jitter. If the cable meets the impedance requirements for a 10BASE-T link, jitter should not be a concern.

2-2

SEH USER’S GUIDE

CABLE SPECIFICATIONS

Delay

The maximum propagation delay of a 10BASE-T link segment must not exceed 1000 ns. This 1000 ns maximum delay limits the maximum link segment length to no greater than 200 meters.

Crosstalk

Crosstalk is caused by signal coupling between the different cable pairs contained within a multi-pair cable bundle. 10BASE-T transceivers are designed so that the user does not need to be concerned about cable crosstalk, provided the cable meets all other requirements.

Noise

Noise is caused by either crosstalk or externally induced impulses. Impulse noise may cause data errors if the impulses occur at very speciﬁc times during data transmission. Generally , the user need not be concerned about noise. If noise-related data errors are suspected, it may be necessary to either reroute the cable or eliminate the source of the impulse noise.

Temperature

Multi-pair PVC 24 AWG cables typically have an attenuation of 8 to 10 dB/100 meters at 20°C (68°F). The attenuation of PVC insulated cable varies signiﬁcantly with temperature. At temperatures greater than 40°C (104°F), Cabletron recommends the use of plenum-rated cables to ensure that cable attenuation remains within speciﬁcation.

SEH USER’S GUIDE

2-3

CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS

2.2 NETWORK PORT SPECIFICATIONS

The SEH-22 and SEH-24 network ports use shielded RJ45 connectors that support both STP and UTP cabling. Figure 2-1 shows the RJ45 pinouts.

1 2 3 4 5 6 7 8

1. Receive + 5. Not Used

2. Receive - 6. Transmit -

3. Transmit + 7. Not Used

4. Not Used 8. Not Used

1490_3

Figure 2-1. RJ45 Network Ports

2.3 TRANSCEIVER REQUIREMENTS

When connecting an external network segment via a transceiver to the SEH with an EPIM-A, the following requirements must be met:

• The transceiver or Ethernet Device to which the module will be connected must meet IEEE 802.3 standards, and/or Ethernet Version 1.0 or Version 2.0 standards.

• The Signal Quality Error (SQE) test function on the transceiver must be disabled when it is connected to a repeater or to an Ethernet Version 1.0 device. In addition, some Version 2.0 equipment does not support the SQE test. Devices that do not support the SQE test interpret the SQE test pulse as a collision.

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