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CentreCOM

AT-MR420TR

AT-MR820TR

Multiport Micro Repeaters

Installation Guide

PN 613-10625-00 Rev A

MRx20TR(STP/UTP)_BookA Page i Thursday, April 3, 1997 5:24 PM

Summary of content (72 pages)

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MRx20TR(STP/UTP)_BookA Page i Thursday, April 3, 1997 5:24 PM CentreCOM ® AT-MR420TR AT-MR820TR Multiport Micro Repeaters Installation Guide PN 613-10625-00 Rev A
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MRx20TR(STP/UTP)_BookA Page ii Thursday, April 3, 1997 5:24 PM Copyright 1997 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. The information provided herein is subject to change without notice.
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MRx20TR(STP/UTP)_BookA Page iii Thursday, April 3, 1997 5:24 PM Electrical Safety and Installation Requirements U.S. Federal Communications Commission RADIATED ENERGY 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.
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MRx20TR(STP/UTP)_BookA Page iv Thursday, April 3, 1997 5:24 PM INSTALLATION ELECTRICAL—AUTO VOLTAGE ADJUSTMENT This product will automatically adjust to any voltage between the ranges shown on the label. ELECTRICAL—TYPE CLASS 1 EQUIPMENT THIS EQUIPMENT MUST BE EARTHED. Power plug must be connected to a properly wired earth ground socket outlet. An improperly wired socket outlet could place hazardous voltages on accessible metal parts. ELECTRICAL—CORD NOTICE Use power cord, maximum 4.
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MRx20TR(STP/UTP)_BookA Page v Thursday, April 3, 1997 5:24 PM KLASSE 1 GERÄTE DIESE GERÄTE MÜSSEN GEERDET SEIN. Der Netzstecker darf nur mit einer vorschriftsmäßig geerdeten Steckdose verbunden werden. Ein unvorschriftsmäßiger Anschluß kann das Metallgehäuseteile unter gefährliche elektrische Spannungen setzen.
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MRx20TR(STP/UTP)_BookA Page vi Thursday, April 3, 1997 5:24 PM ELEKTRISK—KLASSE 1-UDSTYR DETTE UDSTYR KRÆVER JORDFORBINDELSE. Stikket skal være forbundet med en korrekt installeret jordforbunden stikkontakt. En ukorrekt installeret stikkontakt kan sætte livsfarlig spænding til tilgængelige metaldele. ELEKTRISK—LEDNING Anvend ledning af maksimum 4,5 meters længde, med en kapacitet på minimum 6 amp.
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MRx20TR(STP/UTP)_BookA Page vii Thursday, April 3, 1997 5:24 PM 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. MONTAGE-INSTRUCTIES WAARSCHUWING: Deze modellen zijn ontworpen om te werken in HORIZONTALE stand.
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MRx20TR(STP/UTP)_BookA Page viii Thursday, April 3, 1997 5:24 PM ELECTRICITE—INFORMATION SUR LE CORDON Utiliser un cordon secteur de 4,5 mètres de long maximum, calibré à 6 ampères minimum, 250V, et fabriqué en câblage HAR avec connecteur IEC 32C moulé à une extrémité et à l’autre extrémité, une prise de courant mâle répondant aux normes du pays d’utilisation. INSTRUCTIONS DE MONTAGE ATTENTION: Ces modèles sont destiné à fonctionner en position horizontale.
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MRx20TR(STP/UTP)_BookA Page ix Thursday, April 3, 1997 5:24 PM ASENNUSSOHJEET HUOMAUTUS: Nämä mallit on suunniteltu käytettäviksi VAAKA-asennossa. PYSTYASENNUSTA EI SAA TEHDÄ ilman Allied Telesyn -pystykiinnitysalustaa, joka on suunniteltu tähän tarkoitukseen. HUOMAUTUS: Ilmavaihtoreikiä ei pidä tukkia ja niillä täytyy olla vapaa yhteys ympäröivään huoneilmaan, jotta ilmanvaihto tapahtuisi. HUOMAUTUS: ÄLÄ irroita kumijalkoja tuotteesta, ellei Allied Telesynpystykiinnitysalusta ole käytössä.
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MRx20TR(STP/UTP)_BookA Page x Thursday, April 3, 1997 5:24 PM ISTRUZIONI PER IL MONTAGGIO ATTENZIONE: questi modelli sono concepiti per il funzionamento in posizione ORIZZONTALE. NON È POSSIBILE EFFETTUARE IL MONTAGGIO VERTICALE senza utilizzare l’apposito telaio per il montaggio verticale Allied Telesyn. ATTENZIONE: le prese d’aria non vanno ostruite e devono consentire il libero ricircolo dell’aria ambiente per il raffreddamento.
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MRx20TR(STP/UTP)_BookA Page xi Thursday, April 3, 1997 5:24 PM FORSIKTIG: MEKANISK LASTNING Installering av utstyret på hyllen må utføres på slik måte at ingen farlige situasjoner oppstår som en følge av ujevn lastning. FORSIKTIG: Luftventilene må ikke blokkeres og må ha fri tilgang til luft med romtemperatur for avkjøling. FORSIKTIG: Gummiføttene må IKKE fjernes fra produktet med mindre en Allied Telesyn vertikal monteringschassis er i bruk.
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MRx20TR(STP/UTP)_BookA Page xii Thursday, April 3, 1997 5:24 PM INSTRUÇÕES DE INSTALAÇÃO CUIDADO: Este modelos foram projetados para funcionar na posição HORIZONTAL. NÃO DEVE SER EFETUADA INSTALAÇÃO VERTICAL sem o uso de um chassis de montagem vertical Allied Telesyn projetado para este fim específico. CUIDADO: CARREGAMENTO - O equipamento deverá ser montado no suporte de montagem de forma a não causar perigo devido a carregamento não-uniforme.
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MRx20TR(STP/UTP)_BookA Page xiii Thursday, April 3, 1997 5:24 PM INSTRUCCIONES DE MONTAJE ATENCION: Estos modelos están diseñados para operar en posición HORIZONTAL. NO SE DEBEN MONTAR VERTICALMENTE sin el uso de un chasis de montaje vertical de Allied Telesyn que se ha diseñado para este fin. ATENCION: CARGA MECANICA - El montaje del equipo en el bastidor debe realizarse de manera tal que no cause una condición peligrosa debido a la distribución desigual del peso.
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MRx20TR(STP/UTP)_BookA Page xiv Thursday, April 3, 1997 5:24 PM MONTERINGSINSTRUKTIONER VARNING: Dessa modeller är konstruerade för användning i HORISONTALLÄGE. VERTIKALMONTERING får EJ UTFÖRAS utan att ett Allied Telesyn specialkonstruerat vertikalt monteringschassi används. VARNING: MEKANISK BELASTNING: Utrustningen ska installeras i chassit på så sätt att fara inte uppstår p g a ojämn belastning. VARNING: Luftventilerna får ej blockeras och måste ha fri tillgång till omgivande rumsluft för avsvalning.
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MRx20TR(STP/UTP)_BookA Page xv Thursday, April 3, 1997 5:24 PM Table of Contents Electrical Safety and Installation Requirements . . . . . . . . . . . . . . . . . .iii About This Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix Document Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx Contacting ATI Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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MRx20TR(STP/UTP)_BookA Page xvi Thursday, April 3, 1997 5:24 PM Chapter 3 Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Four Media Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AC Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Base-T Network Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AUI Port . . . . . .
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MRx20TR(STP/UTP)_BookA Page xvii Thursday, April 3, 1997 5:24 PM Appendix D CentreCOM AT-MR420TR/AT-MR820TR Guide Feedback . . . . . . . . . 45 Appendix E Where To Find Us . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Appendix F Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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MRx20TR(STP/UTP)_BookA Page xviii Thursday, April 3, 1997 5:24 PM
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MRx20TR(STP/UTP)_BookA Page xix Thursday, April 3, 1997 5:24 PM About This Guide This guide is written for system administrators who are responsible for configuring, monitoring, and maintaining a Local Area Network (LAN) of which Allied Telesyn’s AT-MR420TR and AT-MR820TR Micro Repeaters are components. This guide serves as an installation guide and reference guide for both products.
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MRx20TR(STP/UTP)_BookA Page xx Thursday, April 3, 1997 5:24 PM About This Guide Document Conventions The following conventions are used in presenting information in this guide: Note A note provides additional information or describes the possible consequence of a specific action you can perform.
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MRx20TR(STP/UTP)_BookA Page xxi Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide The process is straightforward: Once the BBS is accessed, it requests that you register either as a new user or as a current user. It then provides instructions on the various features and functions available. This is followed by a list and description of all available technical notes and files that can be downloaded.
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MRx20TR(STP/UTP)_BookA Page xxii Thursday, April 3, 1997 5:24 PM
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MRx20TR(STP/UTP)_BookA Page 1 Thursday, April 3, 1997 5:24 PM Chapter 1 Product Description Overview Allied Telesyn’s multiport AT-MR420TR/AT-MR820TR Micro Repeaters represent a compact, inexpensive solution for Local Area Network (LAN) applications. AT-MR420TR/AT-MR820TR Micro Repeaters combine 10 Mbps of 10Base-T Ethernet connectivity with the same features and functionality of larger, more expensive repeaters.
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MRx20TR(STP/UTP)_BookA Page 2 Thursday, April 3, 1997 5:24 PM Product Description Figure 1: AT-MR420TR and AT-MR820TR Front Panels Figure 2: AT-MR420TR and AT-MR820TR Rear Panels On the back panel are four/eight STP/UTP RJ45 network ports, including Port 4/8, an uplink port, as well as the 10Base5 and 10Base2 backbone network ports, Figure 1 and Figure 2 also show the three-pin AC power receptacle.
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MRx20TR(STP/UTP)_BookA Page 3 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide Features The AT-MR420TR/AT-MR820TR Micro Repeaters have incorporated the latest technologies, including a custom Application Specific Integrated Circuit (ASIC) and Surface Mount Technology (SMT). These result in enhanced functionality, increased reliability, improved performance, and lower cost. The AT-MR420TR/AT-MR820TR Micro Repeaters have the following features: ❑ IEEE 802.
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MRx20TR(STP/UTP)_BookA Page 4 Thursday, April 3, 1997 5:24 PM Product Description jabber lock-up automatically prevents transmitted data from reaching the repeater if the transmitted data time exceeds a specified duration (usually 5 ms). Backbone Network Port There are two user-selectable network media options which can be used to connect to a backbone network: 10Base2 and 10Base5. These network ports are located on the back panel. See Figure 3.
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MRx20TR(STP/UTP)_BookA Page 5 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide ❑ 10Base5 (Attachment Unit Interface [AUI]) — Located to the right of the BNC port, the 10Base5 network port connects the repeater to the network using standard ( thick) Ethernet cable and AUI-series connectors. Alternatively, you can fit an Allied Telesyn 802.3 transceiver into this port for alternative media connections, for example fiber optics.
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MRx20TR(STP/UTP)_BookA Page 6 Thursday, April 3, 1997 5:24 PM Product Description Backbone Enable Switch This dual-position switch allows you to activate the backbone network AUI and BNC ports. When this switch is ON (default position), it is depressed below the surface of the chassis. The ON position (enabled) indicates that both 10Base2 and AUI ports have a backbone network capability. Deactivating the switch to OFF (disabled) means that the switch is flush with the surface of the chassis.
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MRx20TR(STP/UTP)_BookA Page 7 Thursday, April 3, 1997 5:24 PM Chapter 2 Installation Site Requirements Ventilation AT-MR420TR/AT-MR820TR Micro Repeaters have grilled openings on both sides for ventilation. Although they do not require an internal fan to aid in cooling, adequate ventilation is required. Ensure that the ventilation openings located on the sides of the chassis are never blocked. Note Maximum ambient operating temperature is 104o F (40o C).
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MRx20TR(STP/UTP)_BookA Page 8 Thursday, April 3, 1997 5:24 PM Installation Quick Installation 1. Carefully remove the AT-MR420TR/AT-MR820TR Micro Repeaters from their packaging materials. Keep the packing materials until you have successfully installed the product. 2. Place them in a location with adequate ventilation and power receptacles. 3. Apply power by plugging in the AC cord and ensure that the POWER LED on the front panel is illuminated. 4.
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MRx20TR(STP/UTP)_BookA Page 9 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide Connections The AT-MR420TR/AT-MR820TR Micro Repeaters have the following connectors: ❑ RJ45 ❑ AUI ❑ BNC RJ45 Ports Attach an RJ45 10Base-T STP/UTP cable to port 1. The respective segment LINK OK LED located on the front panel should light when the 10Base-T network adapter card in the device on the opposite end of the STP/UTP segment is operational.
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MRx20TR(STP/UTP)_BookA Page 10 Thursday, April 3, 1997 5:24 PM Installation LED Status Indicators The front panel indicators are grouped into the following categories: ❑ Network Load ❑ Port Status ❑ Hub Status Network Load Indicators Eight Network Load LEDs indicating the percentage of network utilization, are located on the front panel. Figure 5 shows these LEDs.
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MRx20TR(STP/UTP)_BookA Page 11 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide Note A data packet is too fast for the human eye to distinguish on an LED, therefore the LEDs will not reflect real-time activity. The repeater artificially stretches the LED on time for easier observation. Figure 6: Port Indicators Each RJ45 repeater port has two LEDs — LINK OK and Receive: ❑ LINK OK — No light—Indicates typically a physical connection problem.
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MRx20TR(STP/UTP)_BookA Page 12 Thursday, April 3, 1997 5:24 PM Installation If there is no link light, there is no signal continuity. Check that the attached Data Terminal Equipment (DTE) is ON and that the proper cable is being used. If this check does not identify the problem, it may indicate that a repeater or the device connected to the port is faulty. Move the cable to the adjacent ports to further isolate the problem to the repeater or to the attached device.
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MRx20TR(STP/UTP)_BookA Page 13 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide Table 1: Hub Status LEDs LED Color Description Power green lights when AC power is applied Collision1 amber flashes indicating an SQE or frame collisions on a segment. This may be caused by an overloaded segment, faulty cable, or loose connection. Activity green indicates that the repeater is functional and is transmitting packets 1 Occasional collisions are normal in Ethernet networks.
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MRx20TR(STP/UTP)_BookA Page 14 Thursday, April 3, 1997 5:24 PM Installation Note The LINK LED validates the receive pair only. The opposite end of the STP segment is responsible for validating the transmit pair.
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MRx20TR(STP/UTP)_BookA Page 15 Thursday, April 3, 1997 5:24 PM Chapter 3 Connectivity Four Media Connectors This repeater has four types of ports and media connectors: ❑ AC input power connector ❑ 10Base5 (AUI) network backbone port ❑ 10Base2 (BNC) network backbone port ❑ Four/Eight STP/UTP 10Base-T (RJ45) ports These four types of connecting media are described in the following sections.
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MRx20TR(STP/UTP)_BookA Page 16 Thursday, April 3, 1997 5:24 PM Connectivity Figure 8: Power Connector 16
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MRx20TR(STP/UTP)_BookA Page 17 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide 10Base-T Network Specifications Table 2 provides an overview of the IEEE 802.3 specifications for 10Base-T network configurations using thick, thin, and twisted-pair wiring. Table 2: IEEE 802.
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MRx20TR(STP/UTP)_BookA Page 18 Thursday, April 3, 1997 5:24 PM Connectivity Figure 9: AUI Network Port 10Base5 (Thick) Ethernet Cable. When configuring 10Base5 coax segments, IEEE 802.3 specifications allow a maximum of 100 MAU attachments, spaced at multiples of 2.5 meters (8.2 ft.) measured accurately from the cable end (50 Ω terminator included). The 10Base5 cable segment should not exceed 500 meters (1,640 ft.). Worst-case “end-to-end” propagation delay of a 10Base5 coax segment is 2165 ns.
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MRx20TR(STP/UTP)_BookA Page 19 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide 5.13 ns/meter. This cable internally consists of four shielded twisted pair wires with an overall shield and drain wire; a 15-pin D-shell male connector at one end and a 15-pin D-shell female connector at the other end. Cable impedance is nominally 78 Ω. The AUI cable typically connects a transceiver attached to a coaxial segment to a DTE (workstation).
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MRx20TR(STP/UTP)_BookA Page 20 Thursday, April 3, 1997 5:24 PM Connectivity Twisted Pair (RJ45) Connector Figure 11 shows a twisted pair cable with RJ45 connectors. For a 10Base-T link between a repeater and a Medium Attachment Unit (MAU) or Network Interface Controller (NIC), the cable is wired straight through. Figure 11: RJ45 Connector 10Base-T STP cables can be up to 100 meters (328 ft.) in length. The cable should be 22 to 26 AWG TP wire with 100Ω impedance and rated at Category 3, 4, or 5.
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MRx20TR(STP/UTP)_BookA Page 21 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide 10Base-T connections require Category 3, 4, or 5. In most cases, if a cable type is flat, it is typically untwisted and can cause problems. Generally, cable that is more or less round in section, gives better results. Hub to MAU Wiring. The most typical TP cable for the AT-MR420TR/ AT-MR820TR Micro Repeaters is TP Hub to TP transceiver Data Terminal Equipment (DTE).
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MRx20TR(STP/UTP)_BookA Page 22 Thursday, April 3, 1997 5:24 PM
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MRx20TR(STP/UTP)_BookA Page 23 Thursday, April 3, 1997 5:24 PM Chapter 4 Topology Standalone Topology Figure 12 shows a standalone topology. Four workstations are connected directly to the repeater through the repeater’s RJ45 ports. 100 Meters TP cable wired Pin to Pin 10BaseT Tranciever Figure 12: AT-MR420TR Standalone Topology Cascade Topology A shared Ethernet network can be expanded by interconnecting repeaters (cascading) through the UTP ports.
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MRx20TR(STP/UTP)_BookA Page 24 Thursday, April 3, 1997 5:24 PM Topology Figure 13: AT-MR820TR Four Cascaded Repeaters The Four-Repeater Rule. The IEEE 802.3 standard provides general rules for 10Base-T cable length and network connections on single segments of cable or on point-to-point links with media attenuation and signal propagation delays. The basic rule applies for all networks. The maximum number of repeaters in the data path between any two nodes cannot exceed four.
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MRx20TR(STP/UTP)_BookA Page 25 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide the termination switch. Figure 14 shows the location of the twoposition 50 Ω Terminator switch. The switch is either ON (the default) or OFF. Figure 14: Terminator Switch OFF (disabled) — When installing a hub at an intermediate point of a thinnet cable, a BNC-T connector must be used to connect the cable to the backbone port and the terminator switch must be disabled. See Figure 14.
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MRx20TR(STP/UTP)_BookA Page 26 Thursday, April 3, 1997 5:24 PM Topology Backbone Networks The most straightforward topology is a backbone network. Figure 15 show a backbone network topology with the AUI port attaching to a coaxial Ethernet cable.
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MRx20TR(STP/UTP)_BookA Page 27 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide second unit. A maximum of four repeaters (the four repeater rule) can be interconnected. The network effectively consists of 6 nodes for the AT-MR420TR and 14 nodes for the AT-MR820TR. The Uplink port is located on the back panel, as shown in Figure 16. Figure 16: Uplink Port for MR420TR/820TR Port 4/8 has the ability to become a dedicated uplink port.
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MRx20TR(STP/UTP)_BookA Page 28 Thursday, April 3, 1997 5:24 PM Topology ❑ In the MDI configuration — the slide switch is to the left — you can connect the 10Base-T port to another 10Base-T internal crossover port, that is, a repeater using straight-through twisted pair cable to form an interrepeater link. See Figure 16. If you use this port to connect repeaters to each other, the RJ45 pinout switch must be set to MDI.
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MRx20TR(STP/UTP)_BookA Page 29 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide 10Base2 Backbone A maximum of 30 AT-MR420TR/AT-MR820TR Micro Repeaters can be connected in a network using 10Base2 (thin Ethernet). When you use the BNC port, you avoid using transceivers to complete the linkage. See Figure 18.
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MRx20TR(STP/UTP)_BookA Page 30 Thursday, April 3, 1997 5:24 PM Topology Fiber Optic Backbone By attaching a fiber optic transceiver, the AUI port can connect your network to a fiber optic (10Base-FL/FOIRL) cable backbone.
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MRx20TR(STP/UTP)_BookA Page 31 Thursday, April 3, 1997 5:24 PM Appendix A Technical Specifications The AT-MR420TR/AT-MR820TR Specifications Physical Height 37.6 mm (1.55 in.) Width 332 mm (13 in.) Depth 112 mm (4.4 in.) Installation options Tabletop or rack-mount Electrical Rating Input voltage 100-120 or 200-240 VAC Frequency 50 or 60 Hz Amperage 0.5/0.
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MRx20TR(STP/UTP)_BookA Page 32 Thursday, April 3, 1997 5:24 PM Technical Specifications Diagnostic LEDs Individual port link status (4/8) Individual port receive activity (4/8) Hub status (3), specifying: ❑ Both Transmit and Receive activity ❑ Collision ❑ Power Certification Safety UL 1950, CSA 22.2 No.
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MRx20TR(STP/UTP)_BookA Page 33 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide Connectors Notice how the pins are numbered in Figure 20. Be sure to hold the connectors in the same orientation when connecting the wires to the pins. 8 1 8 1 Figure 20: Connector Pin Numbers Each twisted-pair link segment must have a male connector attached to both ends.
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MRx20TR(STP/UTP)_BookA Page 34 Thursday, April 3, 1997 5:24 PM Technical Specifications Straight-through Wiring If the twisted-pair link segment is to join two ports on a switch, and only one of the ports has an internal crossover, the two pairs of wires must be straight-through, as shown in Table 4.
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MRx20TR(STP/UTP)_BookA Page 35 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide 5 - 4 - 3 Rule In addition to the requirements outlined in Chapter 3, Table 2, follow the “5-4-3 rule” to ensure that your configuration does not exceed the maximum 10Base-T data transmission path (the longest path through any given network). The 5-4-3 rule describes the maximum path between any two devices or nodes (PCs or other stations) on the network.
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MRx20TR(STP/UTP)_BookA Page 37 Thursday, April 3, 1997 5:24 PM Appendix B Glossary 10Base2—Also called thin Ethernet, thinnet or CheaperNet, a 10 MHz baseband specification. Cable impedance is 50 Ω and maximum coaxial segment length is 185 meters (607 ft.). 10Base5—Also called thick Ethernet, a 10 MHz baseband specification. Cable impedance is 50 Ω and maximum coaxial segment is 500 meters (1,640 ft.). The cable is commonly referred to as yellow cable.
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MRx20TR(STP/UTP)_BookA Page 38 Thursday, April 3, 1997 5:24 PM Glossary medium (coax cable) for data packet transmission. It provides for a level of error detection should that transmission be corrupted or impeded by contention for the transmission medium. COAX SEGMENT—A segment of Ethernet cable that contains MAUs. COAXIAL CABLE—A two-conductor (center conductor, shield system), concentric, constant impedance transmission line used as the trunk medium in the baseband system.
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MRx20TR(STP/UTP)_BookA Page 39 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide HUB/REPEATER—A hub is a central signal distributor. It is used in a wiring topology consisting of several point-to-point segments originating from a central point. The term hub is often used interchangeably with the term repeater. Multiport 10Base-T, 10Base2 and fiber optic (10Base-FL, FOIRL) repeaters are considered hubs. See Repeater.
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MRx20TR(STP/UTP)_BookA Page 40 Thursday, April 3, 1997 5:24 PM Glossary MEDIUM ATTACHMENT UNIT (MAU)—In a LAN, a device used in a data station to couple the DTE to the transmission medium. MEDIUM DEPENDENT INTERFACE (MDI)—The mechanical and electrical interface between a hub and a transceiver (MAU). MDI-X is another version of the interface that enables hubs to connect using different pin-outs, thereby avoiding conflicts that occur when receiving and transmitting packets use the same pin-out.
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MRx20TR(STP/UTP)_BookA Page 41 Thursday, April 3, 1997 5:24 PM AT-MR420TR and AT-MR820TR Installation Guide SQE TEST—Commonly referred to as Heartbeat, is a special 802.3 signal sent by the MAU to the DTE to test the collision detection function. Some DTE want SQE and others do not. Repeaters do not want the SQE Test. STRAIGHT-THROUGH—A type of wiring connection where the pins of one connector connect to the same pins of another connector.
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MRx20TR(STP/UTP)_BookA Page 43 Thursday, April 3, 1997 5:24 PM Appendix C Technical Support Fax Order Name__________________________________________________________________ Company _______________________________________________________________ Address ________________________________________________________________ City ________________________ State/Province _______________________________ Zip/Postal Code ___________________ Country _______________________________ Phone _______________________________
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MRx20TR(STP/UTP)_BookA Page 45 Thursday, April 3, 1997 5:24 PM Appendix D CentreCOM AT-MR420TR/AT-MR820TR Guide Feedback Please tell us what additional information you would like to see discussed in the guide. If there are topics you would like information on that were not covered in the guide, please photocopy this page, answer the questions and fax or mail this form back to Allied Telesyn International Corp. The mailing address and fax number are at the bottom of the page.
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MRx20TR(STP/UTP)_BookA Page 47 Thursday, April 3, 1997 5:24 PM Appendix E Where To Find Us For Technical Support or Service Location Phone Fax Asia Singapore, Taiwan, Thailand, Malaysia, Indonesia, Korea, Philippines, China, India (+65) 3815-613 (+65) 3833-830 Australia Australia, New Zealand (612) 416-0619 (612) 416-9764 France France, Belgium, Luxembourg, The Netherlands, Middle East, Africa (+33) 1-60-92-15-32 (+33) 1-69-28-37-49 Germany Germany, Switzerland, Austria, Eastern Europe (+49)
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MRx20TR(STP/UTP)_BookA Page 48 Thursday, April 3, 1997 5:24 PM Where To Find Us For Sales Information Australia Lindfield, NSW Tel: (612) 416-0619, Fax: (612) 416-9764 Canada Rexdale, Ontario Tel: (416) 675-6738, Fax: (416) 675-0057 Richmond, British Columbia Tel: (604) 244-0678, Fax: (604) 270-3644 England Abingdon, Oxon Tel: (+44) 1235-442500, Fax: (+44) 1235-442590 France Les Ulis Tel: (+33) 1-60921525, Fax: (+33) 169-28-37-49 Germany Berlin Tel: (+49) 30-435-90-00, Fax: (+49) 30-435-706-50 Freising Te
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MRx20TR(STP/UTP)_BookA Page 49 Thursday, April 3, 1997 5:24 PM Appendix F Index Numerics 50 Ω terminator switch 4, 6 802.
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MRx20TR(STP/UTP)_BookA Page 50 Thursday, April 3, 1997 5:24 PM Index 10Base2/AUI backbone switches 5 AUI 17 AUI network 9 backbone 17 backbone network 4 BNC 19 BNC network 9 network backbone 15 RJ45 9 uplink 2, 8 power conditioners 15 product description 1 R RJ45 network ports 2 S segmentation 3 signal quality error (SQE) 8 site requirements 7 specifications 10Base-T Network 17 certification 32 connector ports 31 diagnostic LEDs 32 electrical 31 environmental 31 physical 31 50 surface mount technology