Cabletron Systems SEHI100TX User Manual

SEHI100TX-22 100BASE-T INTELLIGENT STACKABLE HUB USER’S GUIDE

®

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.

Copyright 1996 by Cabletron Systems, Inc., P.O. Box 5005, Rochester, NH 03866-5005 All Rights Reserved

Printed in the United States of America

Order Number: 9031511-01 April 1996

SPECTRUM, LANVIEW and BRIM are registered trademarks and Element Manager, EPIM, EPIM-100FX, EPIM-100TX, HubSTACK, MicroMMAC, SEH, and SEHI are trademarks of Cabletron Systems, Inc.

All other product names mentioned in this manual may be trademarks or registered trademarks of their respective companies.

Printed on

Recycled Paper

SEHI100TX User’s Guide

i

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.

ii	SEHI100TX 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

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.

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 EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY 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 WARRANTIES, IN SOME INSTANCES THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.

SEHI100TX User’s Guide

iii

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 03867-0505.

iv	SEHI100TX User’s Guide

CONTENTS

CHAPTER 1		INTRODUCTION
1.1	Using This Manual.......................................................................		1-1
1.2	Document Conventions ...............................................................		1-2
1.3	Getting Help.................................................................................		1-3
1.4	Related Manuals..........................................................................		1-3
CHAPTER 2 SEHI FEATURES AND OPTIONS
2.1	SEHI Overview ............................................................................		2-1
2.2	SEHI Features .............................................................................		2-2
2.3	Stackable Capabilities .................................................................		2-3
2.4	Rack Mounting Capabilities .........................................................		2-4
2.5	Remote Network Management....................................................		2-4
2.6	Optional 100BASE-TX and 100BASE-FX EPIMs........................		2-4
CHAPTER 3		INSTALLATION REQUIREMENTS
		AND SPECIFICATIONS
3.1	Cable Specifications ....................................................................		3-1
	3.1.1 HubSTACK Interconnect Cable Requirements...............		3-1
	3.1.2	UTP Cable Specifications ...............................................	3-2
	3.1.3 Multimode Specifications for the EPIM-100FX ...............		3-3
3.2	Network Cable Lengths ...............................................................		3-4
3.3	Network Port Specifications.........................................................		3-5
3.4	COM Port Requirements .............................................................		3-5
3.5	Operating Specifications..............................................................		3-6
	3.5.1	Power Supply Requirements ..........................................	3-6
	3.5.2	Environmental Requirements .........................................	3-6
3.6	Agency Approvals........................................................................		3-7
3.7	Physical Specifications ................................................................		3-7
CHAPTER 4		INSTALLATION
4.1	Unpacking the SEHI ....................................................................		4-1
4.2	Pre-Installation Checkout ............................................................		4-2
4.3	Tabletop or Shelf Installation .......................................................		4-3
4.4	Rackmount Installation ................................................................		4-4
4.5	Powering Up and Stacking the SEHI...........................................		4-7
4.6	Installing the EPIM-100TX or the EPIM-100FX ...........................		4-9

SEHI100TX User’s Guide

v

Contents

CHAPTER 5 CONNECTING TO THE NETWORK
5.1	Connecting the SEHI to the Network ...........................................		5-1
	5.1.1 Connecting to Network Ports...........................................		5-1
	5.1.2 Connecting a UTP Segment to an EPIM-100TX .............		5-2
	5.1.3 Connecting a Fiber Segment to the EPIM-100FX ...........		5-4
5.2	Testing the Installation .................................................................		5-5
CHAPTER 6		TROUBLESHOOTING
6.1	Installation Test............................................................................		6-1
6.2	Using LANVIEW...........................................................................		6-2
6.3	Using the RESET Button .............................................................		6-4
6.4	Setting the NVRAM Switch ..........................................................		6-5
CHAPTER 7		LOCAL MANAGEMENT
7.1	Local Management Keyboard Conventions .................................		7-2
7.2	Management Terminal Setup.......................................................		7-3
7.3	Accessing Local Management .....................................................		7-6
7.4	The Feature Selection Screen .....................................................		7-7
7.5	The Community Name Table Screen...........................................		7-8
	7.5.1 Editing the Community Name Field.................................		7-9
7.6	The Configuration Screen ..........................................................		7-10
	7.6.1 Setting the IP Address...................................................		7-12
	7.6.2 Setting the Subnet Mask ...............................................		7-12
	7.6.3 Setting the Default Gateway..........................................		7-13
	7.6.4 Using the Port Enable Override.....................................		7-13
	7.6.5 Exiting the Configuration Screen...................................		7-14
7.7	The Trap Table Screen ..............................................................		7-14
	7.7.1 Configuring the Trap Table............................................		7-15
	7.7.2 Exiting the Trap Table Screen.......................................		7-15
7.8	The SNMP Tools Screen ...........................................................		7-16
	7.8.1	Getting Individual OIDs .................................................	7-18
	7.8.2 Getting the Next OID .....................................................		7-18
	7.8.3	Setting an OID...............................................................	7-18
	7.8.4	Viewing Multiple OIDs ...................................................	7-19
	7.8.5	Walking Through OIDs ..................................................	7-19
	7.8.6	Stepping Through OIDs.................................................	7-20
	7.8.7	Cycling Through OIDs ...................................................	7-20
	7.8.8 Exiting the SNMP Tools Screen ....................................		7-20

vi	SEHI100TX User’s Guide

			Contents
7.9	The Device Statistics Screen.....................................................		7-21
	7.9.1 Selecting the Appropriate Module/Port .........................		7-23
	7.9.2 Using the ENABLE PORT Command...........................		7-24
	7.9.3 Using the DISABLE PORT Command..........................		7-24
	7.9.4 Exiting the Device Statistics Screen .............................		7-24
APPENDIX A		EPIM SPECIFICATIONS
A.1	EPIM Specifications.....................................................................		A-1
	A.1.1	EPIM-100TX....................................................................	A-1
	A.1.2	EPIM-100FX....................................................................	A-2
APPENDIX B IMAGE FILE DOWNLOAD USING OIDS
B.1	Setting Up a UNIX Workstation as a TFTP Server......................		B-2
B.2	Standard Local Download ...........................................................		B-3

INDEX

SEHI100TX User’s Guide

vii

CHAPTER 1

INTRODUCTION

Welcome to the Cabletron Systems SEHI100TX-22 100BASE-T Intelligent Stackable Hub User’s Guide. This manual provides installation instructions, troubleshooting, and reference information for the SEHI100TX-22.

NOTE	The term SEHI (Stackable Ethernet Hub with Intelligence) is
	used throughout this manual when describing the features and
	functions of the SEHI100TX-22.

1.1USING THIS MANUAL

Read through this manual to gain an understanding of the features and capabilities of the SEHI. A general knowledge of Ethernet and IEEE 802.3u type data communications networks and their physical layer components is helpful when installing the SEHI.

Chapter 1, Introduction, outlines the contents and describes the objectives and conventions of this manual. This chapter also provides getting help information and concludes with a list of related manuals.

Chapter 2, SEHI Features and Options, briefly describes SEHI features and provides information about available options.

Chapter 3, Installation Requirements and Specifications, provides installation requirements, network guidelines, and SEHI specifications.

Chapter 4, Installation, contains instructions for installing the SEHI as a stackable or standalone hub.

Chapter 5, Connecting to the Network, explains how to connect the SEHI to the network using the various media types.

Chapter 6, Troubleshooting, describes how to use the LANVIEW LEDs to troubleshoot network problems.

Chapter 7, Local Management, describes how to use SEHI Local Management screens and the available commands.

SEHI100TX User’s Guide

1-1

Chapter 1: Introduction

Appendix A, EPIM Specifications, provides specifications, cabling information, and switch settings for the Ethernet Port Interface Modules.

Appendix B, Image File Download Using OIDs, provides instructions for setting up a TFTP server and downloading an image file to the SEHI by setting specific MIB OID strings.

1.2DOCUMENT CONVENTIONS

The following conventions are used throughout this document:

NOTE	Note symbol. Calls the reader’s attention to any item of
	information that may be of special importance.

Tip symbol. Conveys helpful hints concerning procedures or TIP actions.

Caution symbol. Contains information essential to avoid

!damage to the equipment.

CAUT ION

Warning symbol. Warns against an action that could result in equipment damage, personal injury or death.

1-2	SEHI100TX User’s Guide

Getting Help

1.3 GETTING HELP

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

By phone	[phone]
	Monday – Friday; 8 A.M. – 8 P.M. Eastern Time
By CompuServe	GO CTRON from any ! prompt
By Internet mail	[e-mail]
By FTP	ctron.com (134.141.197.25)
Login	anonymous
Password	your email address

Before calling Cabletron Systems Technical Support, have the following information ready:

•A description of the failure

•A description of any action(s) already taken to resolve the problem (e.g., changing mode switches, rebooting the unit, etc.)

•A description of your network environment (layout, cable type, etc.)

•Network load and frame size at the time of trouble (if known)

•The serial and revision numbers of all Cabletron Systems products in the network

•The device history (i.e., have you returned the device before, is this a recurring problem, etc.)

•Any previous Return Material Authorization (RMA) numbers

1.4RELATED MANUALS

Use the Cabletron Systems SEH100TX-22 100BASE-T User’s Guide to supplement the procedures and other technical data provided in this manual. The procedures contained in the SEH100TX-22 100BASE-T User’s Guide are referenced where appropriate, but not repeated in this manual.

SEHI100TX User’s Guide

1-3

CHAPTER 2

SEHI FEATURES AND OPTIONS

This chapter provides an overview of the SEHI and contains sections detailing features and available options.

NOTE	The terms SEHI (Stackable Ethernet Hub with Intelligence) and
	SEH (Stackable Ethernet Hub) are used throughout this
	manual when describing the features and functions of the
	SEHI100TX-22 and the SEH100TX-22.

FRONT VIEW

HubSTACK 100BASE-TX HUB WITH LANVIEW®

SEHI100TX-22

RCV

LNK

A

22 21 20 19 18 17 16 15 14 13 12

22X

21X

20X

19X

18X

17X

16X

15X

14X

13X

12X

PWR

CPU

RCV

RESET

CLN

LNK

E

COM

11 10 9 8 7

6

5

4

3

2

1

1

5X

4X

3X

2X

1X

11X

10X

9X

8X

7X

6X

EPIM 1

Port Status LEDs

Network Ports 1-22

System LEDs

EPIM Slot

COM Port

RESET Button

SEHI100TX-22 100BASE-T HUB WITH LANVIEW®
	OUT
	SEH100TX INTERCONNECT
SN	IN
NET.	18
ADD.
	1511

Power Supply

Interconnect Bus "OUT" Port

Interconnect Bus "IN" Port

REAR VIEW

Figure 2-1 The SEHI100TX-22

2.1SEHI OVERVIEW

The SEHI100TX-22 is an intelligent repeating hub providing 22 RJ45 ports and one Ethernet Port Interface Module (EPIM) port on the front panel for network connections. The SEHI has two rear panel HubSTACK Interconnect Bus ports for stackable connections. The SEHI100TX-22 is designed to manage the Cabletron Systems non-intelligent stackable hub, the SEH100TX-22.

SEHI100TX User’s Guide

2-1

Chapter 2: SEHI Features and Options

The SEHI100TX-22 operates in a 100BASE-T Ethernet

!network. This product will NOT operate in a 10BASE-T

CAUT ION	environment. Connect the SEHI100TX-22 and SEH100TX-22
	only to similar 100BASE-T products.
	The SEHI100TX-22 supports the EPIM-100TX and the
	EPIM-100FX. No other Cabletron Systems EPIMs operate in
	this device.

2.2SEHI FEATURES

Repeater Functionality

The SEHI fully conforms to the IEEE 802.3u Repeater specifications. The SEHI transmits retimed data packets, regenerates the preamble, extends fragments, and arbitrates collisions.

The SEHI100TX-22 meets IEEE 802.3u Repeater Class I standards. Class I standards allow one repeater between any two Data Terminal Equipment (DTE) devices within a single collision domain (network).

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

Polarity Detection and Correction

Each twisted pair port on the SEHI incorporates a polarity detection and correction feature that allows the SEHI to pass data regardless of the polarity of the twisted pair segment’s receive link.

FLASH EEPROMs

The SEHI uses FLASH EEPROMs that allow the downloading of new and updated firmware using Cabletron Systems SPECTRUM Element Manager/Windows or any device using BOOTP or TFTP protocols.

2-2	SEHI100TX User’s Guide

Stackable Capabilities

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 conveniently located on the SEHI front panel.

RESET Button

Resetting the hub with the front panel RESET Button reboots the SEHI and initializes the processor. Resetting the SEHI also resets all of the SEH non-intelligent hubs in the stack.

Local Management

Manage the SEHI and its attached segments through Local Management on the SEHI. Local Management provides full packet and error statistics for the entire stack, individual device, or individual port. Access Local Management by attaching a DEC VT320 terminal or a PC using VT320 emulation software to the RJ45 COM port on the SEHI. Cabletron Systems provides a UTP console cable with RJ45 connectors at each end, adaptors for DB9 or DB25 connections and an instruction sheet with adaptor pinout information with the SEHI. Chapter 7, Local Management, provides detailed information on setting up and managing your network through Local Management.

2.3STACKABLE CAPABILITIES

The SEHI100TX-22 intelligent hub is designed to manage a stack of up to four Cabletron Systems SEH100TX-22 non-intelligent hubs. The SEHI is placed at the bottom of the stack. It manages all SEH hubs in the stack and provides full packet and error statistics for the entire stack, individual device, or individual port.

Stack up to four SEH non-intelligent hubs with one SEHI using the Cabletron Systems external HubSTACK Interconnect cables provided with each SEH. Stackable configurations make it possible to maintain only one IEEE repeater hop while providing up to 120 ports. Hubs can be added or removed from the stack without having to power down the entire stack.

SEHI100TX User’s Guide

2-3

Chapter 2: SEHI Features and Options

2.4RACK MOUNTING CAPABILITIES

The SEHI can be installed in a 19-inch rack. Cabletron Systems provides brackets and mounting screws with the SEHI. See Chapter 4, Installation, for complete rack mounting instructions.

2.5REMOTE NETWORK MANAGEMENT

Manage the SEHI remotely with any SNMP network management system. Cabletron Systems offers the following remote management packages:

•Cabletron Systems SPECTRUM

•Cabletron Systems SPECTRUM Element Manager/Windows

•Cabletron Systems Remote SPECTRUM Portable Management Applications

•Third Party SNMP compliant Network Management Packages

2.6OPTIONAL 100BASE-TX and 100BASE-FX EPIMs

100BASE-TX and 100BASE-FX EPIMs are not included with the SEHI but can be purchased separately from Cabletron Systems.

EPIMs enable the expansion of a network through different types of media. Cabletron Systems offers two optional EPIMs for the SEHI100TX-22 and the SEH100TX-22 as shown in Table 2-1.

Table 2-1 100BASE-TX/FX EPIMs

EPIM	Media Type	Connector
EPIM-100TX	Category 5 UTP Cable	RJ45
EPIM-100FX	Multimode Fiber Optic Cable	SC

2-4	SEHI100TX User’s Guide

CHAPTER 3

INSTALLATION REQUIREMENTS

AND SPECIFICATIONS

This Chapter describes cabling requirements, network guidelines, and operating specifications for the SEHI100TX-22.

The network must meet the requirements and conditions

!specified in this chapter to obtain satisfactory performance from

CAUT ION	this equipment. Failure to follow these guidelines could result in
	poor network performance.

3.1CABLE SPECIFICATIONS

The front panel SEHI100TX-22 network ports support Category 5 Unshielded Twisted Pair (UTP) cabling. Ethernet Port Interface Modules (EPIMs) expand the network using UTP (EPIM-100TX) or multimode fiber optic (EPIM-100FX) cabling. For information concerning the two EPIM types, refer to Appendix A. The rear panel Interconnect Bus ports support Cabletron Systems Interconnect cables for stackable applications.

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

3.1.1HubSTACK Interconnect Cable Requirements

Attach the SEHI to the stacked SEH modules with the HubSTACK Interconnect cables provided with each SEH and available only from Cabletron Systems (P/N 9380209). The cable attaches to the SEHI rear panel bus “OUT” port. The SEHI must be placed at the bottom of the stack. Stack up to four SEH hubs together with one SEHI.

SEHI100TX User’s Guide

3-1

Chapter 3: Installation Requirements and Specifications

3.1.2UTP Cable Specifications

The device at the other end of the twisted pair segment must meet IEEE 802.3u 100BASE-T specifications. When connecting a 100BASE-TX Twisted Pair Segment to the SEHI twisted pair network ports and the EPIM-100TX module, the network must meet the following requirements:

Length

The IEEE 802.3u 100BASE-T standard requires that 100BASE-TX devices be capable of transmitting over a 100 meter (328 foot) link using Category 5 UTP wire.

Impedance

UTP cables typically have an impedance of between 85 to 110 ohms.

Jitter

Intersymbol interference and reflections cause jitter in the bit cell timing, resulting in data errors. A 100BASE-TX link must not generate more than 1.4 ns of jitter. If the cable meets the impedance requirements for a 100BASE-TX link, jitter should not be a concern.

Crosstalk

Crosstalk is caused by signal coupling between the different cable pairs contained within a multi-pair cable bundle. 100BASE-TX 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.

3-2	SEHI100TX User’s Guide

Cable Specifications

Propagation Delay

Propagation delay is the amount of time it takes data to travel from the sending device to the receiving device. Total propagation delay allowed for the network is 256 bit times (2.56 s) in one direction (5.12 s round trip). If the total propagation delay between any two nodes on the network exceeds 2.56 s, then use bridges or other devices to further segment the network.

Temperature

The attenuation of PVC insulated cable varies significantly with temperature. At temperatures greater than 40°C (104°F), Cabletron

Systems recommends the use of plenum-rated cables to ensure that cable attenuation remains within specification.

3.1.3Multimode Specifications for the EPIM-100FX

The SEHI supports the Cabletron Systems EPIM-100FX. The EPIM-100FX meets IEEE 802.3u standards. When connecting a fiber optic segment to the SEHI EPIM-100FX module, the network must meet the following requirements:

Cable Loss

Test the fiber optic cable with a fiber optic attenuation test set adjusted for an 850 nm wavelength. This test verifies that the signal loss in a cable is within an acceptable level. The maximum loss for a multimode fiber optic cable is 11.0 dB.

Fiber Optic Budget and Propagation Delay

Determine the maximum fiber optic cable length by calculating the fiber optic budget delay and total network propagation 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.

Propagation delay (collision delay) is the amount of time it takes data to travel from the sending device to the receiving device. Total propagation delay allowed for the entire network is 256 bit times (2.56 s) in one direction (5.12 s round trip). If the total propagation delay between any two nodes on the network exceeds 2.56 s, then use bridges or other devices to further segment the network.

SEHI100TX User’s Guide

3-3

Chapter 3: Installation Requirements and Specifications

3.2NETWORK CABLE LENGTHS

This section details the maximum network cable lengths specified by the IEEE 802.3u standard for a Class I repeater. As stated previously, the physical size of the network is limited primarily by propagation delay. The round trip delay cannot exceed 512 bit times or 5.12 s.

NOTE	A stack of five SEH hubs or four SEH hubs and one SEHI hub
	is equivalent to one repeater.

A 100BASE-T network might use all UTP links, all fiber links or a combination of both. Table 3-1 details the maximum link lengths for each type and combination of cable when used with a Class I repeater.

Figure 3-1 shows a simplified example of a network with one Class I repeater. Link segments A and B represent the longest links in the network. In this case, if both segment A and segment B are UTP, each segment may be up to 100 meters long for a maximum network length of 200 meters. If segment A is UTP and segment B is fiber, the maximum length of the network is 263 meters (with a maximum UTP segment length of 100 meters). If both segments A and B are fiber, the maximum length is 274 meters.

The maximum length of an individual UTP segment may be no

!more than 100 meters.

CAUT ION

Table 3-1 Maximum Class I Network Cable Length

	Number of	UTP	UTP & Fiber	Fiber
	Repeaters
	1	200 m	263 m	274 m

3-4	SEHI100TX User’s Guide

Network Port Specifications

SEHI100TX-22

Repeater

A

B

DTE

DTE

Figure 3-1 Class I Network

3.3NETWORK PORT SPECIFICATIONS

The SEHI network ports use shielded RJ45 connectors that support UTP cabling. Figure 3-2 shows the RJ45 pinouts.

1 2 3 4 5 6 7 8

11X 10X 9X

1.	Receive +		5. Not Used
2.	Receive	-	6. Transmit -
3. Transmit		+	7. Not Used
4.	Not Used		8. Not Used

09162_02

Figure 3-2 RJ45 Network Ports

3.4COM PORT REQUIREMENTS

The RJ45 COM port supports access to a Local Management Console. The COM port supports a Digital Equipment Corporation VT320 terminal or PC emulation of the VT320 terminal. Figure 3-3 shows the pinouts for the RJ45 COM port.

SEHI100TX User’s Guide

3-5

Chapter 3: Installation Requirements and Specifications

1 2 3 4 5 6 7 8

COM

1. Transmit Data		5.	Signal Ground
2.	Data Carrier Detect	6.	Data Terminal Ready
3.	Data Set Ready	7.	Request To Send
4.	Receive Data	8.	Clear To Send
			1511_15
	Figure 3-3 COM Port Pinouts

3.5OPERATING SPECIFICATIONS

The operating specifications for the SEHI100TX-22 are described in this section. Cabletron Systems reserves the right to change these specifications at any time without notice.

3.5.1Power Supply Requirements

The SEHI uses a universal power supply. The input requirements are listed in Table 3-2.

Table 3-2 Power Supply Requirements

	Line Input Range	Current	Frequency
	Volts (V)	Amperes (A)	Hertz (Hz)
	100–125 Vac	4.0 A	50/60 Hz
	200–250 Vac	2.0 A

3.5.2Environmental Requirements

This section details the environmental requirements of the SEHI.

Operating Temperature:	5°C to 40°C (41°F to104°F)
Storage Temperature:	-30°C to 90°C (-22°F to194°F)
Operating Humidity:	5% to 95% (non-condensing)

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Agency Approvals

3.6AGENCY APPROVALS

The safety, emission, and immunity approvals for the SEHI are detailed in this section.

Safety

This unit meets the safety requirements of UL 1950, CSA C22.2 No. 950, IEC 950 and EN 60950.

Emissions

This unit meets the emission requirements of FCC Part 15 Class A, EN 55022 Class A and VCCI Class I.

Immunity

This unit meets the immunity requirements of EN 50082-1 including IEC 801-2 (ESD), IEC 801-3 (Radiated Susceptibility), and

IEC 801-4 (EFT/B).

3.7PHYSICAL SPECIFICATIONS

This section details the physical specifications for the SEHI.

Dimensions (H x W x D):	2.8 in x 17.0 in x 13.5 in
	(7.2 cm x 43.6 cm x 34.6 cm)
Weight:	7 lb (3.15 kg)

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CHAPTER 4

INSTALLATION

This chapter outlines the procedure for attaching the SEHI to the network as a stackable or standalone device. Ensure that the network meets the guidelines and requirements outlined in Chapter 3, Installation Requirements and Specifications, before installing the SEHI.

NOTE	A single phase grounded power receptacle that meets the
	requirements listed in Chapter 3 must be located within seven
	feet of the installation.

Failure to follow installation instructions may result in an electrical shock hazard.

4.1UNPACKING THE SEHI

Unpack the SEHI as follows:

1.Remove the shipping material covering the SEHI in the shipping box.

2.Carefully remove the SEHI from the shipping box and set it aside to prevent damage.

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

4.Read the SEHI Release Notes included in the shipping box.

NOTE	Cabletron Systems includes a 3-1/2" disk with the
	SEHI100TX-22 that contains a backup copy of the FLASH
	Firmware Image File. Download the file to the SEHI100TX-22 if
	the existing image becomes corrupted. See Appendix B for
	detailed download instructions.

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