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General Considerations to re-route cabling away from potential noise sources, or to ensure that the electrical wiring in the area is properly wired and grounded, or to replace connectors along affected segments. Temperature The attenuation of PVC-insulated cable varies significantly with temperature. Check the cable manufacturer’s specifications. Plenum- rated cables are strongly recommended in areas where temperatures exceed 40˚C. Under such conditions, plenum-rated cables ensure that
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Cable Specifications • Where practical, dedicated cable should be used for Token Ring signals. • Work area wall plates and outlets used for the Token Ring network should be clearly labeled as Token Ring network lobe connections. 2.2 Cable Specifications Take care in planning and preparing the cabling and connections for the network. The susceptibility of the LAN’s cables to crosstalk and noise determines the network’s error rate, and thus, the reliability of data propagation
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UTP Cable Categories Table 2-1. UTP Cable Category Specifications Signal NEXT UTP Operating Electrical Attenuation loss Cat. Frequency Impedance per 100m (@ ‡ 100m) 4 MHz £ 100W – 15% £ 5.6 dB ‡ 32 dB 3 16 MHz £ 100W – 15% £ 13.1 dB ‡ 23 dB* 4 MHz £ 100W – 15% £ 4.3 dB ‡ 47 dB 4 16 MHz £ 100W – 15% £ 8.9 dB ‡ 38 dB 4 MHz £ 100W – 15% £ 4.3 dB ‡ 63 dB 5 16 MHz £ 100W – 15% £ 8.2 dB ‡ 44 dB *below Token Ring performance requirement of ‡ 30.5 dB. Category 3
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UTP Lobe Lengths UTP cabling to any non-Token Ring network conductors (telephone, etc.) or ground. If in doubt, test wiring before using. 2.3.2 UTP Lobe Lengths The physical length of the cable connecting a station to a TCU port on the concentrator is referred to as the lobe length. The maximum lobe length attainable with the concentrator, under ideal conditions, is shown in Table 2-2. Cable routing, connector attenuation, noise, and crosstalk can adversely affect the maximum lobe length.
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STH-22/-24/-42/-44
STACKABLE TOKEN RING HUB
USER’S GUIDE
CABLETRON SYSTEMS, P. O. Box 5005, Rochester, NH 03866-5005
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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 CONSEQUENTIAL
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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
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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, WIT
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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
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CONTENTS CONTENTS CHAPTER 1 INTRODUCTION 1.1 Using This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 STH Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.1 LANVIEW LEDs . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.2 TCU Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.3 Automatic Beacon Recovery Process . . . . . . . . 1-4 1.2.4 Support for Passive MAU Workgroups . . . . . . 1-4 1.3 Re
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CONTENTS CHAPTER 3 INSTALLATION 3.1 Unpacking the STH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.2 Installing the STH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.2.1 Rack Mount or Wall Mount Hardware. . . . . . . 3-1 3.2.2 Adding the STH to a Stack . . . . . . . . . . . . . . . . . 3-2 3.2.3 Attaching the Strain Relief Bracket . . . . . . . . . . 3-3 3.2.4 Rack-Mounting the STH . . . . . . . . . . . . . . . . . . . 3-3 3.2.5 Wall-Mounting the STH
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CHAPTER 1 INTRODUCTION Welcome to the Cabletron Systems STH-22/-24/-42/-44 Stackable Token Ring Hub User’s Guide. The STH (Stackable Token Ring Hub) is a non- intelligent hub designed to provide expanded connectivity for Cabletron Systems’ STHi intelligent hubs and Cabletron Systems MicroMMAC intelligent hubs. This manual provides installation instructions and reference information for STH models 22, 24, 42, and 44. Note: The term STH is used throughout this manual when
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STH Overview Connector Ports (TCUs) for connections to stations and other network devices. TOKEN RING HUB with LANVIEW® HubSTACK SUPPORTING 100 OHM UTP CABLE STH-24 24X 23X 22X 21X 20X 19X 18X 17X 16X 15X 14X 13X PWR 16Mb/s STACK 4M 16M SPEED 12X 11X 10X 9X 8X 7X 6X 5X 4X 3X 2X 1X ® STH-24 TOKEN RING HUB with LANVIEW SN RESERVED STACK Figure 1-1. Front and Back Views of the STH-24 Up to four S
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LANVIEW LEDs 1.2.1 LANVIEW LEDs Cabletron Systems’ LANVIEW Status Monitoring and Diagnostics System is a troubleshooting tool. Conveniently located on the front panel, LANVIEW LEDs help the user to quickly identify power failures, beaconing conditions, cable faults, and link problems. Refer to Section 4.1, LANVIEW LED Signals for more information on the LANVIEW LED visual status monitoring system. 1.2.2 TCU Ports Each STH, depending on the STH model (see Table 1-1.
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Automatic Beacon Recovery Process wrong ring speed. If a ring speed mismatch is detected, the STH disables the port to keep the misconfigured station isolated from the ring and provides a simple visible LED signal (blinking red at the port’s LED) to indicate to the user that Speed Fault Protection has disabled the port. The port remains disabled until the ring speed mismatch condition is removed or resolved. Active Circuitry On each TCU port, STH hubs provide active circuitry wh
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Related Manuals By default, each of the STH hub’s TCU ports is configured to its STN (station) setting to support concentrator lobe connections to stations. Through Local Management, any TCU port may be reconfigured to its RO (Ring Out) setting to support connections to passive MAU (Multi- Station Access Unit) workgroups. Improved Protection from Beaconing The STH provides enhanced reliability for existing networks which use passive MAUs because Multiple Ring Out TCUs allow fo
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Related Manuals DAISY-CHAIN MAU CONFIGURATION When MAUs are daisy-chained, they are connected as single collective entity. The entire chain must be bypassed to isolate the hub from a single beaconing station. All stations lose connection if beaconing occurs on any station. Ring Ring (8 Stations) Out In Ring Ring Ring (8 Stations) Out Out In Ring Ring Ring (8 Stations) In Out In Ring Ring (8 Stations) Out Hub with In Ring In / Ring Out RING OUT TCU MAU CONFIGURATION When each MAU is individual
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Getting Help 1.4 Getting Help If you need additional support related to the Cabletron Systems STH, or if you have any questions, comments, or suggestions concerning this manual, contact Cabletron Systems Technical Support: By phone: (603) 332-9400 Monday-Friday; 8am - 8pm EST ® By CompuServe : GO CTRON from any ! prompt By Internet mail: support@ctron.com By Fax: (603) 337-3075 By BBS: (603) 337-3750 By mail: Cabletron Systems, Inc. P.O. Box 5005 Rochester, NH 03866-5005 Page 1-7
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CHAPTER 2 REQUIREMENTS & SPECIFICATIONS This chapter describes network guidelines, power requirements, and operating specifications for the STH. Before installing the STH, read this chapter and confirm that the network meets the requirements and conditions specified in this chapter. Failure to follow these guidelines could result in poor network performance. 2.1 General Considerations All devices connected to the STH must meet IEEE 802.5 Token Ring specifications. Maximum Number
