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SEHI-22, SEHI-24, SEHI-32, AND SEHI-34
10BASE-T INTELLIGENT STACKABLE HUB
USER’S GUIDE
The Complete Networking Solution™
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03867-0505
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NOTICE 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 CONSEQUEN
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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 prote
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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 T
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NOTICE EXCLUSION OF WARRANTY AND DISCLAIMER OF LIABILITY 1. EXCLUSION OF WARRANTY. Except as may be specifically provided by Cabletron in writing, Cabletron makes no warranty, expressed or implied, concerning the Program (including Its documentation and media). CABLETRON DISCLAIMS ALL WARRANTIES, OTHER THAN THOSE SUPPLIED TO YOU BY CABLETRON IN WRITING, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABLITY AND FITNESS FOR A PARTICULAR PURPOSE, W
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CONTENTS TABLE OF CONTENTS APPENDIX A TABLE OF CONTENTS v CHAPTER 1 INTRODUCTION 1.1 USING THIS MANUAL ............................................................ 1-1 1.2 GETTING HELP........................................................................ 1-2 1.3 SEHI OVERVIEW ..................................................................... 1-2 1.4 SEHI FEATURES...................................................................... 1-3 1.5 STACKABLE CAPABILITIES...................
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CONTENTS 2.6 OPERATING SPECIFICATIONS ...........................................2-17 CHAPTER 3 INSTALLATION 3.1 UNPACKING THE SEHI ..........................................................3-1 3.2 INSTALLING THE SEHI ..........................................................3-1 3.2.1 Stacking the SEHI.........................................................3-2 3.2.2 Attaching the Strain Relief Bracket.............................3-4 3.2.3 Rack Mounting the SEHI.......................
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CONTENTS APPENDIX B TWISTED PAIR WIRING TABLES A-1 vii
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INTRODUCTION CHAPTER 1 INTRODUCTION Welcome to the Cabletron Systems SEHI-22, SEHI-24, SEHI-32, and SEHI-34 10BASE-T Intelligent Stackable Hub User’s Guide. This manual explains installation instructions and provides reference information for the SEHI-22, 24, 32, and 34. Note: The term SEHI (Stackable Ethernet Hub with Intelligence) is used throughout this manual when describing features and functions that are common to the SEHI-22, 24, 32, and 34. 1.1 USING THIS
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INTRODUCTION 1.2 GETTING HELP If you need additional support related to the Cabletron Systems SEHI, or if you have any questions, comments, or suggestions concerning this manual, contact Cabletron Systems Technical Support: By phone .................. (603) 332-9400 Monday-Friday; 8am - 8pm EST ® By CompuServe ..... GO CTRON from any ! prompt By Internet mail...... support@ctron.com By FTP ..................... ctron.com (134.141.197.25) Login: anonymous, Password: your email addre
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INTRODUCTION The SEHI-22/24 and SEHI-32/34 are functionally identical with the exception of the network ports: • SEHI-22, 12 RJ45 network ports and one EPIM port. • SEHI-24, 24 RJ45 network ports and two EPIM ports. • SEHI-32, one 50 pin Champ connector, providing 12 twisted pair segments, and one EPIM port. • SEHI-34, two 50 pin Champ connectors, providing 24 twisted pair segments, and two EPIM ports. 1.4 SEHI FEATURES Repeater Functionality The SEHI fully conforms to the IE
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INTRODUCTION LANVIEW LEDs Cabletron Systems’ LANVIEW Status Monitoring and Diagnostics System is a troubleshooting tool that helps you diagnose power failures, collisions, cable faults, and link problems. The LANVIEW LEDs are conveniently located on the SEHI’s front panel. Reset Button The front panel Reset Button lets you reboot the SEHI and initialize the processor. Local Management The SEHI’s Local Management lets you manage the SEHI and all its attached segments. It
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INTRODUCTION 1.7 OPTIONAL FEATURES The following features are not included with the SEHI but can be purchased separately from Cabletron Systems. Ethernet Port Interface Modules (EPIMs) EPIMs let you expand your network through a variety of media. Cabletron Systems offers the EPIMs shown in Table 1-1. Table 1-1. EPIMs EPIM Media Type Connector EPIM-A AUI DB15 (Female) EPIM-C 10BASE-2 Thin Coaxial BNC EPIM-T 10BASE-T Unshielded RJ45 Twisted Pair EPIM-X Standard Transceiver DB15 (Mal
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INTRODUCTION Daughter Board Upgrade Kit You can upgrade the SEHI-22 and the SEHI-32 to 24 ports using the daughter board upgrade kit. The Cabletron part numbers for the upgrades are: • SEHI-22: 24PORT-UGKT-E • SEHI-32: 24PORT-UGKT-E 50P Rack Mount or Wall Mount Hardware You can install your SEHI in a 19-inch rack or mount it on a wall. Cabletron offers an accessory package that includes brackets and mounting screws. The part number for the accessory package is SEHI-ACCY-KIT. 1.
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INSTALLATION REQUIREMENTS/SPECIFICATIONS CHAPTER 2 INSTALLATION REQUIREMENTS/SPECIFICATIONS This Chapter describes cabling requirements, network guidelines, and operating specifications for the SEHI. Be sure to read this chapter before you install the SEHI. 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 SPECIF
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INSTALLATION REQUIREMENTS/SPECIFICATIONS 2.1.2 UTP and STP Cable Specifications for the Network Ports and EPIM-T Module The device at the other end of the twisted pair segment must meet IEEE 802.3 10BASE-T specifications. When you connect a 10BASE-T Twisted Pair Segment to the SEHI’s 10BASE-T Twisted Pair Network Ports and EPIM-T module, your network must meet the following requirements: Length The IEEE 802.3 10BASE-T standard requires that 10BASE-T devices transmit over a 100
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INSTALLATION REQUIREMENTS/SPECIFICATIONS Delay The maximum propagation delay of a 10BASE-T link segment must not exceed 1000 nsec. This 1000 nsec. 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
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INSTALLATION REQUIREMENTS/SPECIFICATIONS 2.1.3 Multimode Fiber Optic Cable Specifications for the EPIM-F1 and EPIM-F2 Modules Table 2-1 shows Multimode Fiber Optic Cable specifications for the EPIM-F1 and EPIM-F2 modules. Table 2-1. Multimode Fiber Optic Cable Specifications Cable Type Attenuation Maximum Cable Length 50/125 m m 13.0 dB or less The maximum allowable fiber optic cable length is 2 km 62.5/125 m m 16.0 dB or less (2187.2 yards). However, IEEE 802.3 specifications 100/140 m m
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INSTALLATION REQUIREMENTS/SPECIFICATIONS 2.1.4 Single Mode Fiber Optic Cable Specifications for the EPIM-F3 Module Table 2-2 shows Single Mode Fiber Optic Cable specifications for the EPIM-F3. Table 2-2. Single Mode Fiber Optic Cable Specifications Cable Type Attenuation Maximum Cable Length 8/125-12/125 m m 10.0 dB or less The maximum allowable fiber optic cable length is 5 km (3.1 miles) with bridges at each segment end. Howev- er, IEEE 802.3 FOIRL specifi- cations specify a maximum of 1 km
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INSTALLATION REQUIREMENTS/SPECIFICATIONS 2.1.5 Thin-Net Network Requirements for the EPIM-C Module When you connect a thin-net segment to the SEHI (via an EPIM-C), your network must meet the following requirements: Cable Type 50 ohm RG-58A/U type coaxial cable must be used when making up a thin-net cable segment. Length The thin-net segment must be no longer than 185 meters. Terminators A 50 ohm terminator must be connected to the far end of each thin-net segment. Connectors A maximum of 29
