CentreCOM Two-Port Ethernet Micro Repeater Model AT
Contents
1. Tel 33 1 69 28 16 17 F ax 33 1 69 28 37 49 Hong Kong Tsim Sha Tsui Kowloon Tel 852 2 376 3199 F ax 852 2 376 3360 Singapore el 65 383 3832 F ax 65 383 3830 Japan Shinagawa ku Tokyo el 81 3 3443 5640 F ax 81 3 3443 2443 Yodogawa ku Osaka Tel 81 6 391 6310 F ax 81 6 391 6325 Fujisawa shi Kanagawa Tel 81 466 88 8510 F ax 81 466 88 8515 Machida shi Tokyo el 81 427 21 8141 F ax 81 427 21 8848 Nagoya shi Aichi el 81 52 223 3791 F ax 81 52 223 3736 CentreCOM is a trademark of Allied Telesyn International Corp Copyright 1995 Allied Telesyn I nternational All rights reserved No part of this publication may be reproduced without prior written permission from Allied Telesyn Allied Telesyn 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 In no event shall Allied Telesyn be liable for any incidental special indirect or consequential damages whatsoever including but not limited to lost profits arising out of or related to this manual or the information contained herein even if Allied Telesyn has been advised of known or should have known the possibility of such damages Allied V n tege Allied Telesyn International 19015 N orth Creek Parkway Suite 200 Bothell WA 98011 Tel 1 206 4872. Fax 1 206 489 9191 Allied Telesyn International Corp 950 Kifer Road Sunnyvale CA 94086 Tel 1 800 424 4284 USA and Canada Fax 11408 736 0100 17 United States Atlanta GA el 404 717 0290 F Salt Lake City UT el 801 350 9130 Vienna VA el 703 506 0196 F Chicago IL Austin TK Dallas TK el 214 446 9873 Reading MA el 617 944 3492 F Los Angeles CA Costa Mesa CA el 714 432 6424 San Diego CA el 619 279 3896 F Clearwater FL el 813 726 0022 F Wenonah NJ el 609 468 1070 F Canada Mississauga Ontai Tel 905 803 8626 Richmond British For Sales Information ax 404 717 0806 F ax 801 350 9051 ax 703 506 1986 el 708 406 8431 F ax 708 406 8462 Tel 512 502 3087 F ax 512 794 9326 F ax 214 446 8555 F ax 617 944 3492 el 310 412 8684 F ax 310 412 8685 F ax 714 432 6546 ax 619 279 3897 ax 813 726 0234 ax 609 468 1201 rio F ax 905 279 0050 Columbia Tel 604 244 0678 Germany Berlin Freising 18 F ax 604 270 3644 Tel 49 30 435 9000 F ax 49 30 435 70650 Tel 49 8161 62 002 F ax 49 8161 68 374 The Netherlands Schiphol el 31 20 654 0111 F ax 31 20 654 0270 Italy Milano Tel 39 2 38093 444 F ax 39 2 38093 448 England Abingdon Oxon el 1 44 865 390001 F ax 1 44 865 390002 France Les Ulis
3. Thin Coax Connections The micro repeater 10BASE 2 thin E thernet connections support a full 185 meters 606 ft of thin E thernet coaxial cable This coax segment will allow up to 30M edia Access U nits MAU or transceiver connections including the connection to the CentreCOM Micro Repeater The BNC coax connector may be plugged directly into the BNC connection without using a BN C T connector and external 500 terminator The termination is built in I f the micro repeater is not on either end of the segment then the internal 50 Q termination must be disabled via the external switch located next to the BNC connector External Power Requirements The AT MR 125D Micro R epeater is designed to accept a wide range of DC power input The recommended voltage and power are as follows 18V to 435 VDC operational voltage range 27 VDC preferred nominal voltage 500mA DC current requirement L ocate the 27V DC outlet at your site and plug the cable into the connector The power indicator should illuminate See F igure 2 MVE CentreCOM ES MR125D dk IEEE 802 3 MICRO REPEATER ame rentre a MAISON Figure 2 DC Input A If you use other than the voltage range specified in this manual you can Note permanently damage your micro repeater and void your warranty Operation The CentreCOM Micro R epeaters re time the E thernet signal and regenerate the E
4. 125D is used to connect two 10BA SE 2 segments The termination switch must be on AE CentreCOM MR125D IEEE 802 3 MICRO REPEATER Thin Ethernet 185 Meters Max 30 MAU Max Thin Ethernet 185 Meters Max 30 MAU Max i 500 5020 Terminator n Terminator m J Figure 4 AT MR125D BNC to BNC Configurations Switch to the OFF Position A S AWE CentreCOM ie MR125D MYA paws EJ VE mer menn Terminator 50 Q Terminator T Connector Thin Ethernet 185 Meters Max 30 MAU Max Thin Ethernet 185 Meters Max 30 MAU Max 50 Q 50 Q Terminator Terminator Figure 5 AT MR125D BNC to BNC Using T Connector If the configuration in F igure 5 is used with BNC T connectors in the center of a segment the termination switch must be disabled OF F on the LAN repeater AT MR 125D 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 sub connector AU Drop cables may have a maximum 257ns propagation delay for computing the worst case propagation d
5. 8880 F ax 1 206 489 9191 Technical Support Tel 1 800 428 4835 F ax 1 206 481 3790
6. BASE 2 Figure 3 AT MR125D Indicators Troubleshooting Power LED is lit but no packets are getting through no network connections across the repeater 1 Check to see if the port is receiving or transmitting packets by checking the R eceive and Transmit indicators 2 Check port connections and wiring Check the termination switch on a 10BASE 2 segment 3 Check for excessive collisions 4 Try another known good repeater to test and validate the segment On a 10BASE 2 BNC port there are too many collisions or packets are not getting through 1 Verify that the segment is properly terminated on both ends and that there is no other termination between these two points Y ou can plug the BNC connector directly into the micro repeater BNC connection if the internal 50 Q termination function is enabled If a BN C T connector is to be used the internal 50 Q termination function should be disabled U sing an Ohm Meter DMM or VOM it is possible to statically test the coaxial segment With terminators in place measure the resistance of the cable from the male connector of a BN C T Touch one of the meter s probes to the inner pin and the other probe to the outside of the BN C T The resistance should be between 25 Q and 30 Q 2 Check the media connections and cabling E xcessive collisions may be caused by network loading a faulty cable or connection Configurations The configuration in Figure 4 shows how an AT MR
7. BNC 3 BNC T 3 C Collision 5 D Data Terminal Equipment DTE 8 External Power Supply Micro Repeaters 4 Index F Four Repeater Rule 9 L LEDs 3 M Media Access Units MAU 3 O On Line 5 P Power 5 propagation delay 9 R Receive 5 S Surface Mount Technology SMT 3 T Transmit 5 Where To Find Us Where To Find Us For Technical Support or Service Location Phone Fax North America United States Canada Mexico Central America South America Australia New Zealand 1 800 428 4835 1 206 481 3790 France France Belgium Luxembourg The Netherlands Middle East Africa 33 1 69 28 16 17 33 1 69 28 37 49 Germany Germany Switzerland Austria Eastern Europe 01 30 83 56 66 49 30 435 70 650 Italy Italy Spain Portugal Greece Turkey Israel United Kingdom United Kingdom Denmark Norway Sweden Finland Iceland Japan 39 2 416 047 39 2 419 282 0 800 20 40 40 44 1 865 390 002 81 3 3443 5640 81 3 3443 2443 Asia Singapore Taiwan Thailand Malaysia Indonesia Korea Philippines China India 65 383 2050 65 383 2079 Hong Kong 852 2 393 0101 852 2 397 7979 Technical Bulletin Board Service 1 206 483 7979 For Information Regarding Allied Telesyn International Corp Allied Telesyn International Corp 19015 North Creek Parkway Suite 200 Bothell WA 98011 Tel 1 206 487 8880
8. ENERGIE IRRADIEE Ce mat riel a t test et certifi conforme par la r glementation am ricaine aux normes d finies pour les appareils de ClasseA S CURIT DANGER DE FOUDRE DANGER NE PAS MANIER le mat riel ou les CABLES lors d activit orageuse INSTRUCTIONS DE MONTAGE ATTENTION Ces model es sont destin s a fonctionner en position HORIZONTALE Le mat riel NE DOIT PAS tre utilis en MONTAGE VERTICAL a moins d utiliser un chassis de montage vertical Allied Telesyn concu a cet effet ATTENTION Ne pas bloquer les fentes d a ration ced emp cherait l air ambiant de circuler librement pour le refroidissement Temp rature De Fonctionnement Ce mat riel est capable de tol rer une temp rature ambiante maximum de 40 degr s Celsius Pour Tous Pays Installer le mat riel conform ment aux normes lectriques nationales et locales SATEILYENERGIA Tama kaupallinen tuote on testattu ja noudattaa Y hdysvaltojen vaatimuksia luokan A laitteelle TURVALLISUUS SALAMANISKUVAARA HENGENVAARA ALA TYOSKENTELE laitteiden tai KAAPELEIDEN KANSSA SALAMOINNIN AIKANA ASENNUSSOHJ EET HUOMAUTUS Nama mallit on suunniteltu k ytett viksi VAAK A asennossa PYSTYASENNUSTA El SAA TEHDA ilman Allied Telesyn pystykiinnitysalustaa joka on suunniteltu t h n tarkoitukseen HUOMAUTUS mavaihtoreiki ei pid tukkia ja niill t ytyy olla vapaa yhteys ymp r iv n huoneilmaan jotta ilmanvaihto tapahtuisi K ytt
9. during periods of LIGHTNING ACTIVITY MOUNTING INSTRUCTIONS CAUTION These models are designed for operation in the HORIZONTAL position VERTICAL MOUNTING must NOT BE DONE without the use of an Allied Telesyn vertical mount chassis designed for this purpose CAUTION Air vents must not be blocked and must have free access to the room ambient air for cooling Operating Temperature This product is designed for a maximum ambient temperature of 40 degrees C All Countries Install product in accordance with local and National Electrical Codes SICHERHEIT GEFAHR DURCH BLITZSCHLAG GEFAHR Keine Arbeiten am Ger t oder an den Kabeln w hrend eines Gewitters ausfuhren MONTAGEANWEISUNGEN VORSICHT Diese Modellesind fur Betrieb in horizontaler Position entworfen worden Das Ger t darf NICHT OHNE Gebrauch eines daf r entworfenen Allied Telesyn Vertikalmontagegestells in VERTIKALER POSITION montiert werden gt e Pe VORSICHT DeEntl ftungs ffnungen d rfen nicht versperrt sein und m ssen zum K Uhlen freien Zugang zur Raumluft haben Betriebstemperatur Dieses Produkt wurde fur den Betrieb in einer Umgebungstemperatur von nicht mehr als 40 C entworfen Alle Lander nstallation muf rtlichen und nationalen elektrischen Vorschriften entsprechen STRALINGSENERGI Dette kommercielle produkt opfylder de krav der i USA stilles til udstyr af KlasseA SIKKERHED FARE UNDER UVEJR FARE UNDLAD at arbejde pa udstyr eller KA
10. 00 meters 328 ft in length from one end to the other Thin 10BASE 2 Ethernet W hen configuring thin coax segments I E E E 802 3 specifications allow 29 or fewer MA Us per cable segment spaced at no less than 0 5 meter 1 6 ft The 10BASE 2 thin cable length can not exceed 185 meters 606 ft per 10BA SE 2 thin cable segment The worst case propagation delay for a 185 meters 606 ft thin E thernet segment is 950 9 ns The propagation delay for 10BA SE 2 thin E thernet cable is 5 14 ns meter Both ends of the segment must be terminated with a 500 termination with a power rating of 0 5 watts or greater E arth grounding of the segment shield must take place at only one point on the cable Thick 10B ASE 5 Ethernet W hen configuring thick coax segments I E E E 802 3 specifications allow 100 MAU attachments or less spaced at multiples of 2 5 meters 8 2 ft measured accurately from the cable end 50 Q terminator included The thick cable segment cannot exceed 500 meters 1640 ft in length Worst case end to end propagation delay of athick coax segment is 2165 ns Propagation delay of thick E thernet coax is calculated at 4 33 ns meter B oth ends of the segment must be terminated with a 50 Q termination with a power rating of 0 5 watts or greater E arth grounding of the segment shield must take place at only one point on the cable 6 IEEE 802 3 Quick Primer Propagation R ound trip propagation delay throughout the
11. Allied Telesyn International AVE CentreCOM Two Port Ethernet Micro Repeater Model AT MR125D User Manual CentreCOM MR125D IEEE 802 3 MICRO REPI PN 613 10368 00 Rev A 951026 gt gt PP 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 This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Note Modifications or changes not expressly approved of by the manufacturer or the FCC can void your right to operate this equipment Canadian Department of Communications This ClassA digital apparatus meets all requirements of the Canadian I nterference Causing E quipment Regulations Cet appareil num rique de la classe A respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada SAFETY LIGHTNING DANGER DANGER DO NOT WORK on equipment or CABLES
12. BLER i perioder med LYNAKTIVITET INSTRUKTIONER FOR OPSTILLING ADVARSEL Disse modeller er konstrueret til at betjenes i HORISONTAL position vandret VERTIKAL OPSTILLING lodret m IKKE FORETAGES uden brug af et Allied Telesyn vertikalt monteringsstel konstrueret til dette formal ADVARSEL Ventilations bninger m ikke blokeres og skal have fri adgang til den omgi vende luft i rummet for afk ling Betjeningstemperatur Dette apparat er konstrueret til en omgi vende temperatur p maksimum 40 grader C Alle Lande Installation af produktet skal ske i overensstemmelse med lokal og national lovgivning for elektriske installationer STRALINGSENERGIE Dit handelsprodukt werd getest en voldoet aan de Amerikaanse vereisten voor een klasse A toestel VEILIGHEID GE VAAR VOOR BLIKSEMINSLAG GE VAAR NIET aan toestellen of KABELS WERKEN bij BLIKSEM MONTAGE INSTRUCTIES OPGELET Deze modellen zijn ontworpen om te werken in HORIZONTALE stand VERTICALE MONTAGE mag NIET UITGEVOERD WORDEN tenzij een daartoe speciaal ontworpen Allied Telesyn chassis voor verticale montage wordt gebruikt OPGELET De ventilatiegaten mogen niet worden gesperd en moeten de omgevingslucht ongehinderd toelaten voor afkoeling gt gt gt e Bedrijfstemperatuur De omgevingstemperatuur voor dit produkt mag niet meer bedragen dan 40 graden Celsius Alle Landen het toestel installeren overeenkomstig de lokale en nationale elektrische voorschriften
13. E Repeating packets results in a higher performance network by regenerating preamble retiming the data packets and extending collision fragments to ensure collision enforcement by all nodes The AT MR 125D is shown in Figure 1 AVE COLLISION RECEIVE C COLLISION RECEIVE Gm SU P VS MRT25D REPEATER PORT 1 10 BASE 2 PORT 2 10 BASE 2 AE Bees Cen ma o S 2 M pc INPUT 10 BASE 2 10 BASE 2 IEEE 802 3 MICRO REPEATER Figure 1 AT MR125D Front and Back Panels The AT MR 125D allows for connection of a thin 10BA SE 2 coaxial segment These media converters utilize state of the art technologies including a custom Application Specific ntegrated Circuit ASIC and Surface M ount Technology SMT which provide enhanced functionality increased reliability and improved performance The use of a proprietary ASIC has permitted A llied Telesyn to make the CentreCOM Micro R epeaters exceptionally compact while providing the complete functionality of large repeaters The small size of the units allows for the repeater function to be brought to the desktop or used in a wall mount installation N etwork diagnostic indicators are provided on the front of the micro repeaters to aid in troubleshooting and fault isolation E ach port has LE Ds appropriate for the medium F or example on the AT M R 125D both ports have Transmit R eceive On Line and Collision indicators Cabling 10B ASE 2
14. O DE RAYOS PELIGRO NO REALICE NINGUN TIPO DE TRABAJ O O CONEXION en los equipos o en LOS CABLES durante TORMENTAS ELECTRICAS INSTRUCCIONES DE MONTAJ E ATENCION Estos modelos est n disefiados para operar en posici n HORIZONTAL NO SE DEBEN MONTAR VERTICALMENTE sin el uso de un chasis de montaje vertical de Allied Telesyn quese ha dise ado para este fin ATENCION Las aberturas para ventilaci n no deber n bloquearse y deber n tener acceso libre al aire ambiental de la sala para su enfriamiento Temperatura Requerida Para La Operaci n Este producto est dise ado para una temperatura ambiental m xima de 40 grados C Para Todos Los Pa ses Monte el producto de acuerdo con los C digos El ctricos locales y nacionales gt gt vi ENERGIUTSTRALNING Denna handelsprodukt har testats och befunnits vara i enlighet med USA s krav f r klass A utrustning S KERHET FARA F R BLIXTNEDSLAG FARA ARBETA EJ p utrustningen eller kablarna vid ASK VADER MONTERINGSINSTRUKTIONER VARNING Dessa modeller ar konstruerade for anv ndning i HORISONTALLAGE VERTIKALMONTERING f r EJ UTF RAS utan att ett Allied Telesyn specialkonstruerat vertikalt monteringschassi anv nds VARNING Luftventilerna f r ej blockeras och m ste ha fri tillg ng till omgivande rumsluft f r avsvalning Driftstemperatur Denna produkt r konstruerad f r rumstemperatur ej verstigande 40 grader Celsius Alla L nder Installera produkten i enlig
15. ata from reaching the medium if the transmit data time length exceeds 150 ms duration This protects the medium from being overrun with data packets from a possibly defective device J ITTER The fluctuation of the data packet in respect to a standard clock cycle Jitter is undesirable and must be minimized LINK SEGMENT The link segment of coaxial cable is a segment which has no MAU devices but links two LAN devices such as repeaters together in a point to point configuration By the inherent nature of 10BA SE T and fiber optic media these media are point to point link segments MEDIA ATTACHMENT UNIT MAU Provides an electrical attachment to a 10BASE 2 or 10BASE 5 coaxial cable segment The MAU will convert the IE E E 802 3 composite signal into separate signals for Data In circuit A and B Data Out circuit A and B Control In circuit A and B Control Out circuit A and B Voltage Plus and Voltage Common N SERIES A barrel shaped threaded connector used on 10BA SE 5 thick E thernet coaxial cable PROPAGATION DELAY Thetimeit takes a signal to travel from the input of a system component to the output U sually measured in nanoseconds I E E E 802 3 has specific propagation delay maximums for computing propagation budgets when designing aL AN Cable length plays a major role in propagation delay i e a 50 meter 164 ft AU I cable has a maximum allowable propagation delay of 257 ns The propagation delay of ca
16. ble is dependent on length and velocity factor of the cable type There are also propagation delays associated with electronics attached to the system SIGNAL QUALITY ERROR SQE Also referred to as Collision or Collision Presence This occurs when two devices attempt to transmit at the same time which is an illegal condition SQE TEST Commonly referred to as heartbeat is a special 802 3 signal sent by the MAU totheDTE totest the collision reporting mechanism Some DTE want SQE Test and others do not R epeaters do not want SQE Test THICK ETHERNET see also 10BASE 5 THIN ETHERNET see also 10BASE 2 10 Trademarks Ethernet is a registered trademark of Xerox Corporation CentreCOM is a registered trademark of Allied Telesyn Copyright 1995 Allied Telesyn Inc All rights reserved No part of this publication may be reproduced without prior written permission from Allied Telesyn Allied Telesyn ATI 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 In no event shall ATI be liable for any incidental special indirect or consequential damages whatsoever including but not limited to lost profits arising out of or related to this manual or the information contained herein even if ATI has been advised of known or should have known the possibility of such damages T
17. echnical Support Fax Order Form Technical Support Fax Order Form Name Company Address City State Province Zip Postal Code Country Phone Fax Incident Summary Model number of Allied Telesyn product I am using Network software products I am using e g network managers Brief summary of problem Conditions List the steps that led up to the problem Detailed description Use separate sheet if necessary When completed fax this sheet to the appropriate ATI office Fax numbers can be found on page 17 CentreCOM AT MR125D Manual Feedback Form CentreCOM AT MR 125D Manual Feedback Form Please tell us what additional information you would like to see discussed in the manual If there are topics you would like information on that were not covered in the manual please photocopy this page answer the questions and fax or mail this form back to Allied Telesyn The mailing address and fax number are at the bottom of the page Your comments are valuable when we plan future revisions of the manual I found the following the most valuable I would like the following more developed I would find the manual more useful if Please fax or mail your feedback Fax to 1 206 481 3790 Or mail to Allied Telesyn International Technical Communications Department 19015 North Creek Parkway Suite 200 Bothell WA 98011 USA Index Numerics 10BASE2 3 A Application Specific I ntegrated Circuit ASIC 3 AUI Drop cables 8 B
18. elay of a cable system AU I cable propagation delay is about 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 sub male connector at one end and a 15 pin D sub female connector at the other end Cable impedance is typically 78Q The AUI cable typically connects a transceiver attached to a coaxial segment to a Data Terminal E quipment DTE workstation 10BASE T 10BASE T UTP media was implemented to reduce Ethernet wiring costs UTP wiring is installed in most buildings for telephone systems Much of this existing cabling is suitable for Ethernet 10 Mb data rates Care must be taken to ensure the buildings UTP wiring is able to carry these Ethernet data rates before a 10BASE T network solution is implemented U nlike coaxial Ethernet 10BASE 2 and 10BASE 5 10BASE T UTP is point to point wiring Typically an Ethernet 10BA SE T transceiver MAU is connected to one end and a 10BASE T Hub R epeater is connected to the other Straight through cabling pinout is used for Hub to MAU connections Hub to Hub and MAU to MAU connections are allowed using a UTP cable with a cross over function crossing TD and TD withRD and R D signals No other attachments are allowed along the length of UTP wire however wiring patch panels and punch down blocks are allowed for interconnecting segments The cable should be Type 3 UTP 1002 impedance 22 to 24 AWG and should not exceed 1
19. elesyn vertikal monteringschassis som er spesiallaget til dette form l FORSIKTIG Lufteventilene m ikke blokkeres og m ha fri tilgang til luft med romtemperatur for avkj ling Driftstemperatur Dette produktet er konstruert for bruk i maksimum romtemperatur p 40 grader celsius Alle Land Produktet m installeres i samsvar med de lokale og nasjonale elektriske koder gt e gt e ENERGIA IRRADIADA E ste produto foi testado e atende aos requisitos para dispositivos comerciais de Classe A dos E U A SEGURAN A PERIGO DE CHOQUE CAUSADO POR RAIO PERIGO NAO TRABALHE no equipamento ou nos CABOS durante per odos suscet veis a QUEDAS DE RAIO INSTRU ES DE INSTALA O CUIDADO Estes modelos foram projetados para funcionar na posi o HORIZONTAL NAO DEVE SER EFETUADA INSTALACAO VERTICAL sem o uso de um chassis de montagem vertical Allied Telesyn projetado para este fim especifico CUIDADO As aberturas de ventila o n o devem ser bloqueadas e devem ter acesso livre ao ar ambiente para arrefecimento adequado do apare ho Temperatura De Funcionamento E ste produto foi projetado para uma temperatura ambiente m xima de 40 graus cent grados Todos Os Pa ses nstale o produto de acordo com as normas nacionais elocais para instala es el tricas ENERGIA RADIADA E ste producto comercial ha sido probado y cumple con las normas requeridas en los EE UU para un dispositivo de Clase A SEGURIDAD PELIGR
20. entire cable system from farthest ends may not exceed 51 7 us Propagation delay is the time it takes a signal to travel from the input of a system component to the output Propagation delay is usually measured in nanoseconds IEEE 802 3 has specific propagation delay maximums for the E thernet components Cable length plays a major role in propagation delay That is a 50 meter 164 ft AUI cable has a maximum propagation delay of 257 ns The propagation delay of a cable is dependent on the length and velocity factor of the cable type Four Repeater Rule N o more than four repeaters can be linked to connect five segments and no other attachments may be on the linking segments I f attachments are present on the repeater coax link segments then no more than two repeaters linking three segments may be configured These limitations are set to keep propagation delay packet jitter and signal attenuation to within acceptable standards Glossary Glossary 10BASE 2 Also called thinnet or CheaperN et 10B A SE 2isa10MHz Baseband 185 meter 606 ft coaxial segment Cable impedance is 509 10BASE 5 Also called thick Ethernet 1OBASE5is a 10 MHz Baseband 500 meter 1639 ft coaxial segment The cable is also referred to as yellow cable Cable impedance is 50 Q Thick Ethernet cable is typically used as a trunk or backbone path of the network 10BASE T IEEE 802 3UTP Ethernet U sing low cost UTP wiring 100 meters 328 ft
21. het med lokala och statliga best mmelser f r elektrisk utrustning Table of Contents Electrical Safety and Installation Requirements i BA NEE A ee a nee aed 1 Cabling AA tee te tae ek Me ae AAA ee eee 1 10BASE2 Thin Coax Connections 1 External Power Requirements 2 Operativa a Od SOM Ala Ok e OS 2 Guttheet wes i a ba a ora E de saa EE 3 Indicators 263k E tie ek ee pete 3 Troubleshooting 3 Configurations 4 IEEE 802 3 Quick Primer 6 AUT Drop Cables serer Se eee tose dl 6 LOB ASEAN s vn a skrev Het hee weed oe eke TE 6 Thin IOBASE 2 Ethernet 6 Thick LOBASE5 Ethernet 6 Propagation NA at Wee te As A ee Reo eee heels 7 Four Repeater Rule 7 Glossary ii A A RA ADE AA 9 Technical Support Fax Order Form 11 Incident Summary corso E al 11 CentreCOM AT MR125D Manual Feedback Form 13 INdex ee EE 15 WhereToFindUs 17 vii Overview Overview CentreCOM Micro R epeaters are two port media converters designed for E thernet coax network segments CentreCOM Micro R epeaters support full length segments on either side fully repeated transmission and the maximum number of nodes specified by the IE E
22. l mp tila T m tuote on suunniteltu ymp r iv n ilman maksimil mp tilalle 40 C Kaikki Maat Asenna tuote paikallisten ja kansallisten s hk turvallisuusm r ysten mukaisesti gt e gt gt ENERGIA IRRADIATA Questo prodotto commerciale amp stato collaudato e risponde ai requisiti U S A per i dispositivi di classe NORME DI SICUREZZA PERICOLO DI FULMINI PERICOLO NON LAVORARE sul dispositivo o sui CAVI durante PRECIPITAZIONI TEMPORALESCHE ISTRUZIONI PER IL MONTAGGIO ATTENZIONE questi modelli sono concepiti per il funzionamento in posizione ORIZZONTALE NON E 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 Temperatura Di Funzionamento Questo prodotto concepito per una temperatura ambientale massima di 40 gradi centigradi Tutti Paesi installare il prodotto in conformit delle vigenti normative elettriche nazionali UTSTR LT ENERGI Dette kommersielle produktet er blitt testet og funnet v re i samsvar med amerikanske krav for et klasse A apparat SIKKERHET FARE FOR LYNNEDSLAG FARE ARBEID IKKE p utstyr eller KABLER i TORDENV R BRUKSANVISNING FOR MONTERING FORSIKTIG Disse modellene er beregnet til bruk i HORISONTAL stilling VERTIKAL MONTERING m IKKE UTF RES uten bruk av et Allied T
23. of point to point link segments are possible Uses RJ 45 connectors and sometimes 50 pin AMP connectors to a patch panel 15 PIN D SUB CONNECTOR The AU cable uses 15 pin D connectors D refers to the shape of the connector shell and sub refers to the size Also called D sub miniature miniature D DB 15 or DI X connectors In Ethernet a female 15 pin connector isa DTE connection and a male 15 pin connector is a transceiver connection Male always attaches to female gender changing is not allowed ATTACHMENT UNIT INTERFACE AUI The cable connection from an MAU transceiver toa DTE typically a workstation consisting of a 15 conductor twisted pair cable of 50 meters 164 ft maximum length BNC SERIES A 10BASE 2 thin coax connector with push on bayonet locking lug that quickly locks into place with a half twist COAX SEGMENT A segment of E thernet cable that contains MAU See also Link Segment DATA TERMINAL EQUIPMENT DTE TheMAU withanAUI cable The DTE could be aE thernet workstation host server repeater bridge router or gateway DTE connections are female 15 pin connectors DIX CONNECTOR see also D Sub Connectors HEARTBEAT seealso SQE Test IMPEDANCE An electrical characteristic of a circuit dealing with the combination of the AC and DC resistance and the appearance of that resistance to attached circuits JABBER This function is the MAU s ability to automatically inhibit the transmit d
24. thernet packet and preamble The micro repeaters also count the number of consecutive collisions I f this number reaches 32 then the repeater takes the segment Off L ine partition If one valid Ethernet packet is received on that segment the repeater places the segment On L ine automatically thus disconnecting problem segments and reconnecting valid segments dynamically Switches Switches Two BNC ports on the AT MR 125D have two terminating switches for selecting or deselecting the internal 50 Q termination function for the thinnet connection The factory default of the 50 Q terminator switch is the ON setting No Note external BN C T and 50 Q terminator are required when this switch is 5 enabled Indicators The following diagnostic indicators are common to the micro repeaters These indicators are shown in F igure 3 Power ndicates the external source providing power to the micro repeater On Line T his indicator is lit when the port is ready for operation and is not partitioned Collision ndicates a collision detected on that port Receive T his indicator will flash whenever a packet is received on that port Brief flashes indicate low traffic levels Transmit ndicates micro repeater transmitting a packet out of that port C COLLISION RECEIVE gt COLLISION RECEIVE AVE Gert eam I Y ly ly Td Wd eye MR125D IEEE 802 3 MICRO REPEATER PORT 1 10 BASE 2 PORT 2 10
Download Pdf Manuals
Related Search