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Allied Telesis AT-MR420T, Installation Manual

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Allied Telesis AT-MR420T Installation Manual Download Page 57

AT-MR420T and AT-MR820T Installation Guide

35

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. For example, pin 1 of 
one connector connects to pin 1 of another connector.

THICK ETHERNET—See 10Base5

THIN ETHERNET—See 10Base2

TRUNK CABLE—The coaxial cable used to distribute signals over long 
distances throughout a cable system.

UNSHIELDED TWISTED PAIR (UTP)—A cable used in 10Base-T wiring 
that consists of at least two twisted pairs of 22 to 26 AWG wire. The pairs 
should have at least 3 twists per foot and have an impedance of 100 

Ω

. Level 3, 

Level 4 and Level 5 UTP cables fit these criteria. 

MRx20T(UTP)Ver6_Book  Page 35  Thursday, April 3, 1997  5:18 PM

Summary of Contents for AT-MR420T

Page 1: ...CentreCOM AT MR420T AT MR820T Multiport Micro Repeaters Installation Guide PN 613 10624 00 Rev A MRx20T UTP Ver6_Book Page i Thursday April 3 1997 5 18 PM...

Page 2: ...llied Telesyn International Corp has been advised of known or should have known the possibility of such damages Trademarks Ethernet is a registered trademark of Xerox Corporation UNIX is a registered...

Page 3: ...e power cord 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 R...

Page 4: ...esem Fall m te der Anwender angemessene Gegenma nahmen ergreifen St rsicherheit EN50082 1 NORMEN Dieses Produkt erf llt die Anforderungen der nachfolgenden Normen Die Sicherheitspr fung dieser Produkt...

Page 5: ...ERHED ELEKTRISKE FORHOLDSREGLER RISIKO FOR ELEKTRISK ST D For at forebygge ELEKTRISK st d undlad at bne apparatet Der er ingen indre dele der kan repareres af brugeren Denne enhed indeholder LIVSFARLI...

Page 6: ...e stroombron ontkoppelen alvorens de LAN kabels te koppelen of ontkoppelen GEVAAR VOOR BLIKSEMINSLAG GEVAAR NIET aan toestellen of KABELS WERKEN bij BLIKSEM WAARSCHUWING HET TOESTEL WORDT UITGESCHAKEL...

Page 7: ...ATTENTION LE CORDON D ALIMENTATION SERT DE MISE HORS CIRCUIT POUR COUPER L ALIMENTATION DE L APPAREIL d branchez le cordon INSTALLATION ELECTRICITE REGLAGE DE TENSION AUTOMATIQUE Ce produit peut s aju...

Page 8: ...laitteiden tai KAAPELEIDEN KANSSA SALAMOINNIN AIKANA HUOMAUTUS VIRTAJOHTOA K YTET N VIRRANKATKAISULAITTEENA VIRTA KATKAISTAAN irrottamalla virtajohto ASENNUS S HK AUTOMAATTINEN J NNITTEENS T T m tuote...

Page 9: ...ONI TEMPORALESCHE ATTENZIONE IL CAVO DI ALIMENTAZIONE USATO COME DISPOSITIVO DI DISATTIVAZIONE PER TOGLIERE LA CORRENTE AL DISPOSITIVO staccare il cavo di alimentazione INSTALLAZIONE ELETTRICIT REGOLA...

Page 10: ...RSIKTIG STR MLEDNINGEN BRUKES TIL SL APPARATET AV HVIS DU VIL DEAKTIVISERE UTSTYRET m du fjerne str mledningen INSTALLASJON ELEKTRISK AUTO SPENNINGSTILPASSING Dette produktet vil automatisk bli tilpas...

Page 11: ...TA O UTILIZADO COMO UM DISPOSITIVO DE DESCONEX O PARA DESELETRIFICAR O EQUIPAMENTO desconecte o cabo de alimenta o INSTALA O EL TRICO AJUSTE AUTOM TICO DE VOLTAGEM Este produto ajustar se automaticame...

Page 12: ...ACION SE USA COMO UN DISPOSITIVO DE DESCONEXION PARA DESACTIVAR EL EQUIPO desconecte el cable de alimentaci n INSTALACION ELECTRICO AUTO AJUSTE DE TENSION Este producto se ajustar autom ticamente a cu...

Page 13: ...MBRYTARE F R ATT KOPPLA FR N STR MMEN dra ur n tkabeln INSTALLATION ELEKTRISKT AUTOMATISK SP NNINGSJUSTERING Denna produkt justeras automatiskt till alla sp nningar inom omf nget som indikeras p produ...

Page 14: ...MRx20T UTP Ver6_Book Page xiv Thursday April 3 1997 5 18 PM...

Page 15: ...Forum xxi Chapter 1 Product Description 1 Overview 1 AT MR420T AT MR820T Faceplates 1 Features 3 Backbone Network Port 4 Chapter 2 Installation 5 Site Requirements 5 Ventilation 5 Power 5 Quick Insta...

Page 16: ...ptic Backbone 25 Appendix A Technical Specifications 27 The AT MR420T AT MR820T Specifications 27 Physical 27 Electrical 27 Connector Ports 27 Environmental 27 Diagnostic LEDs 28 Certification 28 10Ba...

Page 17: ...xvii Appendix E Where To Find Us 41 Appendix F Index 43 MRx20T UTP Ver6_Book Page xvii Thursday April 3 1997 5 18 PM...

Page 18: ...MRx20T UTP Ver6_Book Page xviii Thursday April 3 1997 5 18 PM...

Page 19: ...ation procedures connections and LED Status Indicators Chapter 3 Connectivity provides instructions associated with the media connectors and ports Chapter 4 Topology describes uplink and cascading cap...

Page 20: ...letin board services Electronic mail via the Internet CompuServe forum When you contact Technical Support you should have the following information available Serial number of the AT MR420T AT MR820T P...

Page 21: ...rnet Mail You can send electronic mail via the Internet to tech_support centre com CompuServe Forum ATI has a forum on CompuServe You can reach us by typing go allied at the CompuServe prompt MRx20T U...

Page 22: ...MRx20T UTP Ver6_Book Page xxii Thursday April 3 1997 5 18 PM...

Page 23: ...802 3 standards AT MR420T AT MR820T Faceplates Figure 1 and Figure 2 show the front and back panels of the two versions respectively The front panel consists of eight Network Load LEDs indicating the...

Page 24: ...Product Description 2 Figure 1 AT MR420T Front and Back Panels Figure 2 AT MR820T Front and Back Panels MRx20T UTP Ver6_Book Page 2 Thursday April 3 1997 5 18 PM...

Page 25: ...on Test link capability Auto partitioning and jabber lock up protection Status and diagnostic LEDs Network Load LEDs UTP uplink port supported for network cascading Packet Regeneration Packet regenera...

Page 26: ...maximum packet length That is 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...

Page 27: ...respectively Because there is no external power switch power is applied when the power cord is connected Note For countries other than the United States and Canada use a power cord that is rated at 6...

Page 28: ...able to the 15 pin connector on the back panel Make sure that the external transceiver has its Signal Quality Error SQE Heartbeat Test function disabled When power is applied to the AT MR420T AT MR820...

Page 29: ...ach repeater has one AUI port to accommodate a 10Base5 standard or thick Ethernet cable connection to the network backbone using an AUI LED Status Indicators The front panel indicators are grouped int...

Page 30: ...repeater artificially stretches the LED on time for easier observation Figure 5 Port Indicators Each RJ45 repeater port has two LEDs LINK OK and Receive LINK OK No light Link is not OK If the polarit...

Page 31: ...s 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 probl...

Page 32: ...tion disconnect the active 10Base T connector and connect it to the next successive port Continue this process until all 10Base T ports have been validated with good network connections 3 Establish a...

Page 33: ...0T Installation Guide 11 Note The LINK OK LED validates the receive pair only The opposite end of the UTP segment is responsible for validating the transmit pair MRx20T UTP Ver6_Book Page 11 Thursday...

Page 34: ...MRx20T UTP Ver6_Book Page 12 Thursday April 3 1997 5 18 PM...

Page 35: ...itioners to supply power to network devices the source must be able to provide AC power at 100 120 200 240 VAC and 60 50 Hz This aids in isolating the network equipment from electrical power noise Loc...

Page 36: ...Connectivity 14 Figure 7 Power Connector MRx20T UTP Ver6_Book Page 14 Thursday April 3 1997 5 18 PM...

Page 37: ...le See Figure 8 Alternatively you can fit any of a variety of Allied Telesyn s 802 3 transceivers into this port should you select a different medium such as fiber optics 10Base T 10Base2 10Base5 Medi...

Page 38: ...arth grounding of the segment shield is allowed at only one point on the cable AUI Drop Cables AUI or drop cables should not exceed 50 meters 164 feet Attachments may be made only to the cable ends at...

Page 39: ...ists concerning identification of modular cable There are various grades of voice quality and data quality cables available These can appear to be similar but their high speed data transmission charac...

Page 40: ...pical UTP cable for the AT MR420T AT MR820T Micro Repeaters is UTP Hub to UTP transceiver Data Terminal Equipment DTE To configure your own cables see Appendix A Technical Specifications MRx20T UTP Ve...

Page 41: ...kstations are connected directly to the repeater through the repeater s RJ45 ports Figure 10 AT MR420T Standalone Topology 100 Meters maximum Category 3 5 UTP cable wired Pin to Pin AUI cable Coaxial...

Page 42: ...enty six AT MR820T ports Its design complies with the four repeater rule Additional UTP ports are available if the AUI port is used for cascading The Four Repeater Rule The IEEE 802 3 standard provide...

Page 43: ...network and the backbone is used to link the various workgroups through the bridges The advantages of a backbone network topology are twofold When the backbone network is operating correctly any prob...

Page 44: ...s the four repeater rule can be interconnected The network effectively consists of 6 nodes for the AT MR420T and 14 nodes for the AT MR820T The Uplink port is located on the back panel as shown in Fig...

Page 45: ...r the RJ45 pinout switch must be set to MDI The MDI position is a repeater pinout which automatically swaps the TX and RX pinouts so that they do not conflict with the TX and RX ports at the other end...

Page 46: ...AT MR820T Micro Repeaters connecting to a thick Ethernet backbone using a transceiver Figure 14 10Base5 Backbone Topology 100 Meters maximum Category 3 5 UTP cable wired Pin to Pin AUI cable Coaxial...

Page 47: ...iminates grounding problems secure from unauthorized taps 10Base FOIRL The IEEE FOIRL fiber optic inter repeater link standard limit of a fiber segment is 1 km The fiber optic cable that connects two...

Page 48: ...MRx20T UTP Ver6_Book Page 26 Thursday April 3 1997 5 18 PM...

Page 49: ...Installation options Tabletop or rack mount Electrical Input voltage 100 120 or 200 240 VAC Frequency 50 or 60 Hz Connector Ports 4 8 RJ45 Ethernet ports MDI X 1 AUI D type 15 pin female port Environm...

Page 50: ...A EN55022 CISPR 22 Class A 10Base T Pin Assignments An Ethernet twisted pair link segment requires two pairs of wires Each wire pair is identified by solid and striped colored wires For example one w...

Page 51: ...ble 3 TX and TR represent Transmitted Data and Ready Data respectively Table 3 Straight through RJ45 Pin Assignments Crossover Wiring Two repeaters can communicate only if the transmitter on one unit...

Page 52: ...on the network There can be Up to five segments in series Up to four repeaters or multiport hubs Up to three populated segments that is segments attached to two or more PCs The remaining two segments...

Page 53: ...sub connector and sometimes a 15 conductor twisted pair cable Maximum length is 50 meters 164 ft BASEBAND COAXIAL SYSTEM A system whereby information is directly encoded and impressed on the coaxial...

Page 54: ...me pins as another 10Base T MAU If pins were wired straight there would be two transmitters on one pair and no receiver As a solution the crossover cable crosses the TD pair with the RD Ready Data pai...

Page 55: ...forcement signal output by the repeater to all ports The jam signal consists of 96 bits of alternating 1s and 0s The purpose is to extend a collision sufficiently so that all devices cease transmittin...

Page 56: ...over cable PROPAGATION DELAY The time it takes a signal to travel from the input of a system component to the output Usually measured in nanoseconds IEEE 802 3 has specific propagation delay maxima fo...

Page 57: ...her connector For example pin 1 of one connector connects to pin 1 of another connector THICK ETHERNET See 10Base5 THIN ETHERNET See 10Base2 TRUNK CABLE The coaxial cable used to distribute signals ov...

Page 58: ...MRx20T UTP Ver6_Book Page 36 Thursday April 3 1997 5 18 PM...

Page 59: ...___ Conditions List the steps that led up to the problem ____________________ _______________________________________________________________ __________________________________________________________...

Page 60: ...MRx20T UTP Ver6_Book Page 38 Thursday April 3 1997 5 18 PM...

Page 61: ...______________________________________________________________ I would like the following more developed ______________________________ _______________________________________________________________...

Page 62: ...MRx20T UTP Ver6_Book Page 40 Thursday April 3 1997 5 18 PM...

Page 63: ...047 39 2 419282 Japan 81 3 3443 5640 81 3 3443 2443 North America United States Canada Mexico Central America South America 1 800 428 4835 1 206 481 3790 United Kingdom United Kingdom Denmark Norway S...

Page 64: ...7 Fax 602 423 7088 Los Angeles CA Tel 310 412 8684 Fax 310 412 8685 Mission Viejo CA Tel 714 699 0628 Fax 714 699 0276 For Sales Information San Diego CA Tel 619 279 3899 Fax 619 279 3897 Santa Ana CA...

Page 65: ...17 compliance IEEE 802 3 3 connections 6 7 connectivity 13 connectors power 13 UTP RJ45 17 F features 3 auto partitioning 3 jabber lock up protection 4 link integrity 3 regeneration 3 H hub status pow...

Page 66: ...twork 15 certification 28 connector ports 27 diagnostic LEDs 28 electrical 27 environmental 27 physical 27 surface mount technology SMT 3 switches MDI MDI X 22 T technical support services bulletin bo...

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