Allied Telesis CentreCOM AT-3012T User Manual
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Allied Telesis CentreCOM AT-3012T User Manual

Allied Telesis CentreCOM AT-3012T User Manual

Multiport repeater
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Telesyn
CentreCOM™
AT-3012T
Multiport Repeater
User Manual

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Summary of Contents for Allied Telesis CentreCOM AT-3012T

  • Page 1 Allied Telesyn CentreCOM™ AT-3012T Multiport Repeater User Manual...
  • Page 2 Copyright 1994 Allied Telesyn International, Corp. All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn International, Corp. Allied Telesyn International, Corp. reserves the right to make changes in specifications and other information contained in this document without prior written notice.

  • Page 3: Electrical Safety And Installation Requirements

    RADIATED ENERGY U.S. Federal Communications Note: This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
  • Page 4 NETZKABEL Das Netzkabel sollte eine maximale Länge von 4,5 Metern, einen Nennwert von mindestens 6 A und 250 V haben, aus HAR-Material hergestellt und mit einer gepreßten, IEC 320 entsprechenden, Anschlußverbindung an einem Ende, und am anderen Ende mit einem im Land des Endverbrauchers geprüften Stecker ausgestattet sein.
  • Page 5 ELEKTRISCHE—TOESTELLEN VAN KLASSE 1 DIT TOESTEL MOET GEAARD WORDEN. De stekker moet aangesloten zijn op een juist geaarde contactdoos. Een onjuist geaarde contactdoos kan de metalen onderdelen waarmee de gebruiker eventueel in aanraking komt onder gevaarlijke spanning stellen. ELEKTRISCHE—SNOEREN Gebruik een elektrisch snoer, maximum 4,5 meter lang, berekend voor ten minste 6 ampère, 250 V, uit HAR vervaardigd, met aan het ene uiteinde een gevormde IEC 320 stekker en aan het andere uiteinde een stekker die goedgekeurd is door het land waar het toestel zal worden gebruikt.
  • Page 6 ASENNUS SÄHKÖ —AUTOMAATTINEN JÄNNITTEENSÄÄTÖ Tämä tuote säätää automaattisesti mihin tahansa jännitteeseen ohjetarrassa annettujen arvojen välillä. SÄHKÖ —TYYPPILUOKAN 1 LAITTEET TÄMÄ LAITE TÄYTYY MAADOITTAA. Pistoke täytyy liittää kunnollisesti maadoitettuun pistorasiaan. Virheellisesti johdotettu pistorasia voi altistaa metalliosat vaarallisille jännitteille. SÄHKÖ —JOHTOON LIITTYVÄ HUOMAUTUS Käytä...
  • Page 7 INSTALLASJON ELEKTRISK—AUTO SPENNINGSTILPASSING Dette produktet vil automatisk bli tilpasset hvilken som helst strøminnstilling i de områdene som vises på etiketten. ELEKTRISKE—TYPE 1. KLASSE UTSTYR DETTE UTSTYRET MÅ JORDES. Strømkontakten må være tilkoplet en korrekt jordet grunnstøpselkontakt. En støpselkontakt som ikke er jordet på rett måte, kan tilføre farlig spenning til lett tilgjengelige metalldeler. ELEKTRISKE—MEDDELELSE OM LEDNINGER Bruk en strømledning av maksimal størrelse 4,5 m i lengde, vurdert for minst av 6 amp, 250V, fremstilt av HAR ledning IEC 320 koplingsstykke på...
  • Page 8 ATENCION: EL CABLE DE ALIMENTACION SE USA COMO UN DISPOSITIVO DE DESCONEXION. PARA DESACTIVAR EL EQUIPO, desconecte el cable de alimentación. INSTALACION ELECTRICO—AUTO-AJUSTE DE TENSION Este producto se ajustará automáticamente a cualquier tensión entre los valores máximos y mínimos indicados en la etiqueta. ELECTRICO—EQUIPO DEL TIPO CLASE 1 ESTE EQUIPO TIENE QUE TENER CONEXION A TIERRA.

  • Page 9: Table Of Contents

    Table of Contents Electrical Safety and Installation Requirements .............. i Chapter 1 Overview ..............................1 CentreCOM Multiport Repeater ........................1 AT-3012T 10BASE-T 12 Port Repeater ....................1 Features ..............................2 10BASE-T UTP Cabling..........................3 Hub to MAU Wiring..........................3 Hub to Hub ..............................3 Quick Installation Checklist..........................
  • Page 10 Chapter 4 Troubleshooting ............................ 9 Collision ..............................9 Chapter 5 Configurations ............................. 11 Appendix A IEEE 802.3 Quick Primer ....................... 13 AUI Drop Cables............................13 10BASE-T............................... 13 Thin (10BASE2) Ethernet ........................... 14 Thick (10BASE5) Ethernet ......................... 14 Propagation ..............................14 Four Repeater Rule ............................

  • Page 11: Chapter 1 Overview

    Chapter 1 Overview CentreCOM Multiport Repeater AT-3012T 10BASE-T The CentreCOM Multiport Repeaters are designed to connect up to twelve IEEE 802.3 10BASE-T network segments. In addition to the twisted pair 12 Port Repeater interfaces, a single IEEE 802.3 Attachment Unit Interface (AUI) is provided for attachment to other external transceivers.

  • Page 12: Features

    Overview 10 BASE-T PORTS Allied Telesyn PORT PORT OK ACTIVITY COLLISION POWER 3012T SEGMENT PARTITIONING IEEE 802.3/ETHERNET 10 BASE-T RECEIVE MULTIPORT REPEATER Figure 1: Front Panel Network diagnostics are provided on the front, as shown in Figure 1, and back of the AT-3012T repeaters to aid in troubleshooting and fault isolation. On the front of the repeaters, each network segment has two LEDs, packet “Receive”...

  • Page 13: 10Base-T Utp Cabling

    CentreCOM AT-3012T Multiport Repeater 10BASE-T UTP Cabling Hub to MAU Wiring The most typical Unshielded Twisted Pair (UTP) cable for the AT-3012T will be repeated UTP Hub to UTP transceiver Data Terminal Equipment (DTE) end. The cable pinout for this configuration is illustrated in Figure 2 below. UTP MAU UTP HUB RJ45 PIN...

  • Page 14: Quick Installation Checklist

    Overview Quick Installation Checklist If you are experienced with the AT-3012T multiport 10BASE-T repeater Hub, use the following procedure. If you are not familiar with this repeater, review this list and go on to the next chapter. Setup Carefully unpack the AT-3012T. Retain the packing materials until satisfactory installation has been achieved.

  • Page 15: Chapter 2 Installation

    Chapter 2 Installation Attention Before installing AT-3012T repeaters, read the electrical safety and installation requirements starting on page i. If the installer is experienced with the AT-3012T repeater and does not need detailed installation instructions, refer to Chapter 1 (Quick Installation) of this manual.

  • Page 16: Connections

    Installation Test function disabled. When power is applied to the AT-3012T repeater the external transceiver should also have power. Connections 10BASE-T UTP cables can be up to 100 meters (328 ft.) in length. The cable should be 22 to 26 AWG UTP wire with 100 impedance.

  • Page 17: Chapter 3 Operations

    Chapter 3 Operations Indicators The CentreCOM Multiport 10BASE-T Repeater has LEDs for each port to easily provide status information, as shown in Figure 4. 10 BASE-T PORTS PORT PORT OK ACTIVITY COLLISION POWER SEGMENT PARTITIONING RECEIVE Figure 4: AT-3012T Front Panel Indicator Front Panel Per Port Port OK —This LED indicates that a valid link has been established and the...

  • Page 18: Back Panel

    Operations Collision —This indicator represents SQE or collision. A flickering LED will indicate SQE or collisions. Occasional collisions are normal in Ethernet networks. Excessive collisions is an indication of possible segment problems. A constantly illuminated Collision LED may indicate that there is a port, cabling, or excessive traffic problem.

  • Page 19: Chapter 4 Troubleshooting

    Chapter 4 Troubleshooting If no Power indicator is illuminated 1. Check your power connections. If the Link indicator is not on 1. Check that the opposite end of the UTP link is powered on. 2. Check that the proper cable pinout is used. If another manufacturer’s 10BASE-T device is used on the opposite end of the UTP link, check that it is true 10BASE-T.

  • Page 20: Chapter 5 Configurations

    Chapter 5 Configurations Figure 5 illustrates connecting a CentreCOM Multiport 10BASE-T Repeater to a thick Ethernet backbone supporting 12 10BASE-T Ethernet segments. Coaxial Ethernet Ethernet Transceiver AUI Cable LINK TEST 10 BASE-T PORTS PORT POWER PORTS 100 Meters UTP Cable wired Pin to Pin 10BASE-T 10BASE-T...
  • Page 21 Configurations Coaxial Ethernet Ethernet Transceiver AUI Cable LINK TEST 10 BASE-T PORTS PORT PORTS POWER UTP Link Segment LINK TEST 10 BASE-T PORTS PORT PORTS POWER UTP Link Segment 11 UTP Segments LINK TEST 10 BASE-T PORTS PORT PORTS POWER 10 UTP Segments UTP Link Segment LINK TEST...

  • Page 22: Ieee 802.3 Quick Primer

    Appendix A IEEE 802.3 Quick Primer AUI Drop Cables AUI or Drop cables can be no longer than 50 meters (164 ft.) each. Attachments may be made only to the cable ends at the 15-pin D-shell connector. AUI Drop cables may have a maximum 257 ns propagation delay, as used for computing the worst case propagation delay of a cable system.

  • Page 23: Thin (10Base2) Ethernet

    IEEE 802.3 Quick Primer Thin (10BASE2) Ethernet When configuring thin coax segments, IEEE 802.3 specifications allow 30 or fewer MAU attachments per cable segment spaced at no less than 0.5 meters (1.64 ft.) between each attachment. The thin (10BASE2) cable length can not exceed 185 meters (606 ft.) per thin (10BASE2) cable segment.

  • Page 24: Appendix B Glossary

    Appendix B Glossary 10BASE2 —Also called thinnet or CheaperNet, 10BASE2 is a 10 MHz, baseband, 185 meters (606 ft.) maximum coaxial segment. Cable impedance is 50 . 10BASE5 —Also called thick Ethernet, 10BASE5 is a 10 MHz, baseband, 500 meters (1639 ft.) maximum coaxial segment. The cable is commonly referred to as yellow cable.
  • Page 25 Glossary BIT TIME —The duration of one bit symbol (1/BR). Ethernet specifies a bit time of 100 ns. COAX SEGMENT —A segment of Ethernet cable that contains MAU. CARRIER SENSE MULTIPLE ACCESS with COLLISION DETECT (CSMA/CD) —This is the access method employed by IEEE 802.3 LAN transceivers, by which multiple stations compete for use of the transmission medium (coax cable) for data packet transmission, and provides for a level of error detection should that transmission be corrupted or impeded by...
  • Page 26 CentreCOM AT-3012T Multiport Repeater DEPARTMENT CONCENTRATOR —Hub which provides a large number of workstation connections. Tthe term, department concentrator, refers to multiple repeaters housed in an AT-36C8 chassis. See Hub/Repeater, Repeater. DIX CONNECTOR —See D-Sub Connector HARMONICA ADAPTER —This adapter provides a simple way to convert the 50-pin Telco connection to RJ45 connections.
  • Page 27 Glossary MANAGEMENT AGENT —Software that is used to view hub activity and set hub variables. MAU —See Medium Attachment Unit MAU to MAU, HUB to HUB WIRING —10BASE-T MAU to MAU or hub to hub wiring generally requires a cross-over cable located somewhere along the UTP cable run.
  • Page 28 CentreCOM AT-3012T Multiport Repeater PUNCH-DOWN BLOCK —The punch-down block is the wiring panel where the house wiring from the building’s offices terminates. This is where many 10BASE-T hubs would be located. Wiring installers use a special punch-down tool to insert the UTP wire for data and voice applications. REPEATER —A device used to extend the length, topology, or interconnectivity of the physical medium beyond that imposed by a single segment, up to the maximum allowable end-to-end trunk transmission line...

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