Allied Telesy n International

Allied Telesyn International CentreCOM Fiber Optic Micro Repeaters AT-MR116F — | AT-MR117F AT-MR118FT — | па AI-MR127F RS 201-13 AT-MRI28FT RS 201-173; mm User Manual gp Ny ARENT. ANNE AEE Y Electrical Safety and Installation Requirements > > E RADIATED ENERGY U.S. Federal Communications Commission 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 digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of the Canadian Department of Communications. Le présent appariel numérique n' émet pas de bruits radioélectriques dépassant les limites appicables aux appariels numériques de Classe A. Prescrites dans le réglement sur le brouillage radioélectrique edicte par le minestére des Communications Du Canada. SAFETY WARNING: ELECTRICAL NOTICES ELECTRIC SHOCK HAZARD To prevent ELECTRIC shock, do not remove cover. No user-serviceable parts inside. This unit contains HAZARDOUS VOLTAGES and should only be opened by a trained and qualified technician. To avoid the possibility of ELECTRIC SHOCK disconnect electric power to the product before connecting or disconnecting the LAN cables. Thisisa “CLASS 1 LED PRODUCT” LIGHTNING DANGER DANGER: DO NOT WORK on equipment or CABLES during periods of LIGHTNING A Y. CAUTION: POWER CORD IS USED AS A DISCONNECTION DEVICE. TO DE-ENERGISE EQUIPMENT disconnect the power cord. INSTALLATION ELECTRICAL—AUTO VOLTAGE ADJUSTMENT Lis product will automatically adjust to any voltage between the ranges shown on the abel. ELECTRICAL—TYPE CLASS 1 EQUIPMENT THISEQUIPMENT 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 4.5 meters long, rated 6 amp minimum, 250V, made of HAR cordage molded IEC 320 connector on one end and on the other end a plug approved by the country of end use. 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° C. ALL COUNTRIES: Install product in accordance with local and National Electrical odes. ASENNUS . Ca SAHKO —AUTOMAATTINEN JANNITTEENSAATO Tämä tuote säätää automaattisesti mihin tahansa jännitteeseen ohjetarrassa annettujen arvojen välillä. SAHKO —TYYPPILUOKAN 1 LAITTEET TAMA LAITE TAYTYY MAADOITTAA. Pistoke täytyy liittää kunnollisesti maadoitettuun pistorasiaan. Virheellisesti johdotettu pistorasia voi altistaa metalliosat vaarallisille jánnitteille. SAHKÓ —JOHTOON LIITTYVA HUOMAUTUS Käytä seuraavanlaista virtajohtoa: maksimipituus 4,5 metriä, minimiteho 6 ampeeria, 250 V, valmistettu HAR-johdostosta, muovattu IEC 320 -liitin toisessa päässä ja kaäyttômaassa hyváksytty pistoke toisessa pádssá. HUOMAUTUS: IImavaihtoreikiá ei pidá tukkia ja milla táytyy olla vapaa yhteys ympärôdivään huoneilmaan, jotta ilmanvaihto tapahtuisi. KAYTTOLAMPOTILA Tämä tuote on suunniteltu ympärôivän ilman maksimilämpôtilalle 40“ C. KAIKKI MAAT: Asenna tuote paikallisten ja kansallisten sähkôturvallisuusmääräysten mukaisesti. > > ENERGIA IRRADIATA Questo prodotto commerciale & stato collaudato e risponde ai requisiti U.S.A. per dispositivi di classe A. NORME DI SICUREZZA AVVERTENZE ELETTRICHE PERICOLO DI SCOSSE ELETTRICHE Per evitare SCOSSE ELETTRICHE non asportare il coperchio. Le component: interne non sono riparabili dall'utente. Questa unita ha TENSIONI PERICOLOSE e va aperta solamente da un tecnico specializzato e qualificato. Per evitare ogni possibilita di SCOSSE ELETTRICHE, interrompere l'alimentazione del dispositivo prima di collegare o staccare 1 cavi LAN. Questo ё un “Prodotto con LED di Classe I” PERICOLO DI FULM INI PERICOLO: NON LAVORARE sul dispositivo o sui CAVI durante PRECIPITAZIONI TEMPORALESCHE. ATTENZIONE: IL CAVO DI ALIMENTAZIONE E USATO COME DISPOSITIVO DI DISATTIVAZIONE. PER TOGLIERE LACORRENTE AL DISPOSITIVO staccare il cavo di alimentazione. INSTALLAZIQNE ELETTRICITA—REGOLAZIONE AUTOMATICA DELLA TENSIONE Questo prodotto regolerá automaticamente la tensione ad un valore compreso nella gamma indicata sull’etichetta. ELETTRICITA—DISPOSITIVI DI CLASSE 1 QUESTO DISPOSITIVO DEVE AVERE LA MESSA A TERRA. La spina deve essere inserita in una presa di corrente specificamente dotata di messa a terra. Una presa non cablata tn maniera corretta rischia di scaricare una tensione pericolosa su parti metalliche accessibili. ELETTRICITA—AVVERTENZA SUL CAVO Usare un cavo della lunghezza massima di metri 4,5, con capacità minima di 6 À, 250 V, di filo HAR, dotato di connettore stampato IEC 320 ad un’estremita e di spina approvata dal paese di destinazione all’altra. 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 è concepito per una temperatura ambientale massima di 40 gradi centigradi. TUTTI I PAESI: installare il prodotto in conformita alle vigenti normative elettriche nazionali. Allred Telesyn CentreCOM Fiber Optic Micro Repeaters AT-MR116F AT-MR117F AT-MR118FT AT-MR126F AT-MR127F AT-MR128FT User Manual © Copyright 1995 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. (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. Trademarks: CentreCOM is a registered trademark of Allied Telesyn International Corp. Ethernet is a registered trademark of Xerox Corporation. UNIX is a registered trademark of UNIX System Laboratories. Novell and NetWare are registered trademarks of Novell, Inc. Microsoft and MS-DOS are registered trademarks and LAN Manager and Windows for Workgroups are trademarks of Microsoft Corporation. 3Com is a registered trademark of 3Com. PC-NFS is a trademark of Sun Microsystems, Inc. PC/TCP is a registered trademark of FTP Software, Inc. DECnet is a registered trademark of Digital Equipment Corporation. Table of Contents Electrical Safety and Installation Requirements ....................................... 1 Chapter 1 Overview oii e e eee eee reee eee eee e eee eee 1 The CentreCOM Micro Repeater Family oo... cece, 2 External Power Supply ............. enaoocoooononenaorcaooeocanea ceo eeeceanaacerarecocerecenecesorerecreneo 3 Internal POWer SUPPLY oes eee 3 The AT-MR116F and AT-MR126F ……....…ireresrerrerreneerensrrenrrrrnaesranne san e resserre 3 Activity LEDS .….………rrcrercrrcermmmencenseniererereranressressennneensenaereenrrsanrcacensenasrens rence D The AT-MR117F and AT-MRI12TFE .................. een nene eee eee era er re eee eee 7 The AT-MR118FT and AT-MR128FT …..…....…rrsrereraserrennerensereenarrrrssansrrasrraaararanccranes 9 Chapter 2 Connectivity o.oo eee eee EA periienaceooecacanacenone nenes 13 Cable Types ...................e.remiemii e DI ee eee ee eee eere roer re errar 13 Fiber Optic 1I0OBASE-FL/FOIRL Cable -..............2.e.0em00 De 14 Configuration ......................eeiece ER EEE eee. 14 RJ45 Pin-Out Switch ............e..e..eeveei eee eee eee eee 15 Fiber Cable Connectivity .................e...eme e ee neo ee reee reee reee 16 OST OF SIMA eee Dee eee ener eee eee ree reree erre earn 16 Full- and Half-Repeater Mode of Operation ......................... ena e 17 The Four Repeater Rule .................eeeecn eee ener EEE 17 Full-Repeater Mode of Operation ………………eennnnnnnnnnnnnnnnnnn 17 Half-Repeater Mode of Operation ...................... e reee alero 17 Chapter 3 Troubleshooting ………..…..…..…....…….cicirracrmnansnnsnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnenee 19 Appendix À Data Cabling Techniques een EEE 23 LOBASE-T N 23 UTP Port Wiring ….….rseressresnenennennnnmenennnnnnnnnnnnnnnnnnnnnnnnnnnen+n+e 24 10BASE-FL/FOIRL Ethernet ............. e... near ene re e ae reee. 28 I0BASES (Thick) Ethernet -.............. mine eee en nera eee a der aieiieir eee 28 AUT Drop Cables .....................ee eee e eee reee een e aerea 29 10BASE?2 (Thin) Ethernet ......................——— ene een eee rene ere a reader 29 XI Appendix B (CCT: 1 AS 31 Appendix C Technical Support Fax Order .………..........…..…...…ncncnnenennnnnnnnnnnnnnn 37 Appendix D CentreCOM Fiber Optic Micro Repeaters Manual Feedback ............. 39 15070 (> eee estes serrate essere ees erenerenenenenree recerca renace. 41 Where To Find US ….…................….…rrecrerronanseneerrererernensercerrrsenenmenseceesanre ses ncena neue 43 List of Figures Figure 1: AT-MR116F Front Panel .…........….......rerserereeresersrecrorenensersccaracnensansessces 3 Figure 2: AT-MR116F Back Panel ..................eececcecreiere DD REITER RIE E E ee 4 Figure 3: AT-MR126F Front Panel .................e.e.00cercereree re ere eee nee 4 Figure 4: AT-MR126F Back Panel -..................eeeereiene eee eee nene eran eee, 5 Figure 5: AT-MR117F Front Panel ........ ieee eevee 7 Figure 6: AT-MRI117F Back Panel ..................eccccrcrcccr ce e er e e ee 7 Figure 7: AT-MR127F Front Panel ..............eescscccrercic ener e ee ee ee 8 Figure 8 AT-MRIZTF Back Panel ...... e e e ee e e 8 Figure 9: AT-MRI118FT Front Panel... e ee e eee. 10 Figure 10: AT-MR118FT Back Panel ...............e....nereccierrece ere e e ee 10 Figure 11: AT-MRI128FT Front Panel -................e....erececccic e eee ee eee. 11 Figure 12: AT-MR128FT Back Panel ........oo ieee 11 Figure 13: AT-MR126F to AT-MR117F Configuration ....................e000mecee me 14 Figure 14: AT-MR118FT to AT-MR128FT Configuration ................................. 15 Figure 15: Half-Repeater Mode of Operation ......................erec000re e DDD 18 Figure 16: 10BASE-T UTP Cabling Hub-to-MAU or NIC (Straight-Through) ...................eee=ereeeeeie eee nee eceee eee rene 25 Figure 17: 10BASE-T UTP Cabling Hub-to-Hub (Crossover) ........................ 26 Figure 18: Hub-to-MAU Wiring Usable (A) and Unusable (B) ......................... 27 Figure 19: Pin 1 Orientation on an RJ45 Connector ...:..................eemecerii DD 28 List of Tables Table 1: CentreCOM Fiber Optic Micro Repeaters ....................e.eie EEE 2 Table 2: AT-MR1x6F Fiber Optic Micro Repeaters ......................eier e. 6 Table 3: CentreCOM Micro Repeater Dimensions .....................0eeere DD 6 Table 4: CentreCOM Micro Repeater Weight ......................... ee 6 Table 5: AT-MR127F Fiber Optic Micro Repeaters .....................e.ei 9 Table 6: AT-MR1x8FT Fiber Optic Micro Repeaters ....................... e 11 Table 7: CentreCOM Cable Types ..................eeeeciin eee DA 13 Table 8: Usable and Unusable Twisted Pair Cable recu 24 Table 9: MDI and MDI-X Switch Settings for Common Connection .................. 27 Xi Chapter 1 Overview Welcome to Allied Telesyn! Your decision to purchase a member of Allied Telesyn's family of CentreCOM Fiber Optic Micro Repeaters means that, beginning now, you can not only optimize the operational limits of your existing network but have just incorporated the ability to anticipate future growth. In short, each two-port Micro Repeater has been designed with the present, as well as the future, in mind. Your Micro Repeater is more than just a cost-effective means of interconnecting network devices to fiber optic cable. For example, you will find that each repeater also includes these important features: collision management, an ability to repeat and retime signals, to monitor individual link status and to automatically isolate individual ports that experience problems. And finally, each repeater can automatically resume operations when problems are corrected. While the characteristics of each Micro Repeater will be discussed individually, they all share these common features: OU IEEE 802.3 compliant and Ethernet compatible Industry -standard duplex fiber optic cable Choice of either an external or an internal power supply Full- or half-repeater mode of operation Either SMA or ST fiber optic (10BASE-FL/FOIRL) connectors Automatic segment partitioning and jabber lock-up protection Desktop, wall or 19 inch rack mountable using optional rackmount kits LC CCC Instantaneous visual check of power, port status, collisions and network activity through front-mounted LEDs UU State-of-the-art technologies, including custom Application Specific Integrated Circuits (ASIC) and Surface Mount Technology (SMT) The ability to repeat and retime data packets, regenerate the preamble and extend collision fragment enforcement J One year warranty The CentreCOM Micro Repeater Family The CentreCOM Fiber Optic Micro Repeater family consists of six repeaters: D The AT-MR116F and the AT-MR126F support IEEE 10BASE-FL/Fiber Optic Inter-Repeater Link (FOIRL) to AUI (10BASES) connectivity. OU The AT-MR117F and the AT-MR127F support IEEE 10BASE-FL/ FOIRL to 10BASEZ (thin Ethernet) segments. J The AT-MR118FT and the AT-MR128FT support IEEE 10BASE-FL/ FOIRL to 10BASE-T Unshielded Twisted Pair (UTP) connections. Micro Repeaters is the power supply: the AT-MR11xF has an external ме The difference between AT-MR11xF and AT-MR12xF CentreCOM power supply, the AT-MR12xF has an internal power supply — a feature that is consistent with each model in the entire Micro Repeater family. Because of the external power supply, the AT-MR11xF can be slightly smaller and weigh less if this should be a requirement. Table 1 summarizes the differences among the models. Table 1: CentreCOM Fiber Optic Micro Repeaters Power Model Supply Port 1 Port 2 AT-MR1x6F External or 10BASES 10BASE-FL/FOIRL Internal ( AUI) (SMA or ST) AT-MR1x7F External or 10BASE2 10BASE-FL/FOIRL Internal (BNC) (SMA or ST) AT-MR1x8FT External or 10BASE-T 10BASE-FL/FOIRL Internal (UTP) (SMA or ST) The choice between either an internal or external power supply is a function of the physical characteristics of your particular networking environment such as whether you want the unit to be rack, wall or surface mounted. Regardless of which unit you have purchased, both will mount in a standard 19-inch rack (with cables facing either front or back) or on any horizontal surface such as a shelf or table. In short, since both hubs are only 1.2 inches high (less than one rack space), they require very little space regardless of the mounting configuration. External Power Supply AT-MR116F, AT-MR117F and AT-MR118FT Micro Repeaters have an external universal AC input/DC output power supply. This means they can be used with any 100-240 VAC, 50/60 Hz outlet (a power cord is provided with all models that are intended for use in the United States). manufacturer’s power adapter your Micro Repeater may be damaged. This would also void your warranty and Safety Compliance Certifications. Not Y Use the AC power adapter that is provided. If you use another ote: Internal Power Supply AT-MR126F, AT-MR127F and AT-MR128FT Micro Repeaters have an internal universal AC input/DC output power supply which can be used with any 100-240 VAC, 50/60 Hz outlet (a power cord is provided with all models that are intended for use in the United States). The AT-MR116F and AT-MR126F AT-MR116F and AT-MR126F CentreCOM Micro Repeaters are two-port Ethernet media converters of network transmissions based upon thick Ethernet Attachment Unit Interface (AUT) cable which typically connects a transceiver attached to a coaxial segment to a workstation and fiber optic (10BASE-FL/ FOIRL) cable. The characteristics of both types of cable are discussed in . The front panel of the AT-MR116F CentreCOM Micro Repeater is shown in Figure 1. M9 COLLISION RECEIVE —) COLLISION RECEIVE D Allied Tel | Internationa TRANSMIT ON LINE | а O | O O CentreCOM™ PORT 1: AUI 10BASE-FL/FOIRL MR 1 16F IEEE 802.3 MICRO REPEATER Figure 1: AT-MR116F Front Panel Figure 1 shows the power LED and activity LEDs (On Line, Collision, Receive, Transmit) for both Port 1, the thick Ethernet AUI port and Port 2, the 10BASE-FL/FOIRL port (which also includes a Link LED). The diagnostic indicators are common to all members of the CentreCOM Micro Repeater family and are discussed more thoroughly later. The back panel of the AT-MR116F CentreCOM Micro Repeater is shown in Figure 2. PORT 1 ave Allied To 00000600586 nternationa O | O CentreCOM OO MICRO REPEATER POWER AUI - PORT 2 |] 1 J || TX RX REPEATER 10BASE-FUFOIRL Figure 2: AT-MR116F Back Panel The back panel of the Micro Repeater shows the power receptacle, Port 1 and Port 2. Port 1 is a thick Ethernet port and shows the AUI connector. Port 2 is the fiber optic port and can be specified as either an ST or SMA interface connector: one for receive (RX) and the other for transmit (TX). Port 2 also includes a user-selectable, full- or half-repeater mode of operation switch. These features will be discussed in more detail in . The front panel of the AT-MR126F CentreCOM Micro Repeater is shown in Figure 3. MA (lie J ele CentreCOM” MR 126F IEEE 802.3 MICRO REPEATER PORT 1: AUI PORT 1: 10BASE-FL/FOIRL Figure 3: AT-MR126F Front Panel Figure 3 shows the power LED and activity LEDs (On Line, Collision, Receive, Transmit and Link [on Port 2 only]) for both the AUT port and the 10BASE-FL/ FOIRL port. The back panel of the AT-MR126F CentreCOM Micro Repeater is shown in Figure 4. = Ex ame tasse [Tr | 5 $] Cenrecom o O-2-0 С MR126F | TOBASE-FUFOIRL AUI EEE 802.3 MICRO REPEATER Figure 4: AT-MR126F Back Panel The back panel of the AT-MR126F Micro Repeater shows the power receptacle, Port 1 and Port 2. Port 1 is the thick Ethernet port and shows the AUI connector. Port 2 is the fiber optic port and be specified as either an ST or SMA interface connector: one for receive (RX) and the other for transmit (TX). Port 2 also includes a user-selectable, full- or half-repeater mode of operation switch. These features are discussed in more detail in . Once your CentreCOM Micro Repeater and optional transceiver are installed, your network will support the maximum data transmission distance as well as the maximum number of allowable nodes — all in accordance with IEEE transmission specifications. These parameters are discussed further in. Activity LEDs Link—This indicator will illuminate when a valid link is detected on the Receive (RX) port of the fiber optic segment. The Link indicator must be illuminated on the fiber optic devices at both ends of the segment for Ethernet data to flow. Power—AC power provided to the Micro Repeater. On Line—This indicator is illuminated when the port is ready for operation and is not partitioned. Collision—Indicates a collision detected at that port. Receive—This indicator will flash whenever a packet is received on that port. Brief flashes indicate low traffic levels. Transmit—Indicates Micro Repeater transmitting a packet out of that port. Table 2 summarizes the functional differences between the four models of the AT-MR116F and the AT-MR126F. Table 2: AT-MR1x6F Fiber Optic Micro Repeaters Model Power Port 1 Port 2 Supply AT-MR116F-x1 External 10BASE5 10BASE-FL/FOIRL (AU!) (SMA) AT-MR116F-x3 External 10BASES 10BASE-FL/FOIRL (AUI) (ST) AT-MR126F-x1 Internal 10BASES 10BASE-FL/FOIRL (AU) (SMA) AT-MR126F-x3 Internal 10BASES 10BASE-FL/FOIRL (AUI) (ST) Aninternal power supply means that the AT-MR126F is slightly wider and heavier than the AT-MR116F: it is 7.0 cm (2.8 in.) wider and 200 grams (7.0 0z.) heavier than the AT-MR116F. The dimensions of the two repeaters are shown in Table 3. Table 3: CentreCOM Micro Repeater Dimensions Model Dimensions AT-MR11xF 14.0 cm (5.5 in.) x 11.2 cm (4.4 in.) x 3.1 cm (1.2 in.) AT-MR12xF 21.0 cm (8.3 in.) x 11.2 cm (4.4 in.) x 3.1 cm (1.2 in.) The weights of the two repeaters are shown in Table 4. Table 4: CentreCOM Micro Repeater Weight Model Weight AT-MR11xF 0.3 kg (10 07.) AT-MR12xF 0.5 kg (1 Ib. 1 oz.) The AT-MR117F and AT-MR127F While both the AT-MR117F and AT-MR127F CentreCOM Micro Repeaters are functionally similar to the AT-MR116F and AT-MR126F Micro Repeaters respectively, they differ in the type of non-fiber optic media connectivity. The AT-MR117F and the AT-MR127F employ 10BASE2 thin Ethernet cable as well as fiber optic (10BASE-FL/FOIRL) cable. Thin Ethernet cable is discussed in. Like both members of the AT-MR1x6F series, the AT-MR127F is functionally identical to the AT-MR117F in all respects except for the power supply: the AT-MR117F has an external power supply, the AT-MR127F has an internal power supply. This means that the AT-MR127F is also slightly wider and heavier than the AT-MR117F. As previously stated, the physical dimensions are the same for all members of the Micro Repeater family and are shown in Table 3 and Table 4. The front panel of the AT-MR117F CentreCOM Micro Repeater is shown in Figure 5. AY Alied Te Internationa CentreCOM™ PORT 1: 10 BASE 2 MR 1 1 /F IEEE 802.3 MICRO REPEATER 10BASE-FL/FOIRL Figure 5: AT-MR117F Front Panel The front panel of the CentreCOM AT-MR117F Micro Repeater shows the power and activity LEDs (On Line, Collision, Receive, Transmit and Link [on Port 2 only]) for both Port 1, the 10BASE2 (thin Ethernet port) and Port 2 (the 10BASE-FL/FOIRL port). Figure 6 shows the back panel of the CentreCOM AT-MR117F Micro Repeater. © 1 Al ae (39) O CentreCOM (39) O MR117F TERMINATOR IEEE 802.3 10 BASE 2 MICRO REPEATER POWER Figure 6: AT-MR117F Back Panel PORT 2 REPEATER AX 10BASE-FUFOIRL The back panel of the AT-MR117F Micro Repeater shows the power receptacle, Port 1, the BNC port — which includes a user-selectable 50 Q terminator switch — and Port 2, the two fiber optic connections (again, with either two ST or two SMA connectors). means that an external BNC-T 50 Q terminator is not required when Not The default of the 50 Q terminator switch on the BNC port is ON. This ote 4 ++ this switch is left in the default position. The back panel also includes the user-selectable switch for either full- or half- repeater mode of operation. The 50 Q terminator switch, as well as the full- or half- repeater switch, will be discussed in more detail in . The front panel of the AT-MR127F CentreCOM Micro Repeater is shown in Figure 7. | AVL ed ent с = —— == =D er 9 O € o “To О oO D C= IEEE 802.3 MICRO REPEATER PORT 1: 10 BASE 2 PORT 2: 10BASE -FUFOIRL Figure 7: AT-MR127F Front Panel Figure 7 shows the power LED and activity LEDs (On Line, Collision, Receive, Transmit and Link [on Port 2 only]) for both Port 1, the thin Ethernet (BNC) port and Port 2, the fiber optic port. The back panel of the AT-MR127F CentreCOM Micro Repeater is shown in Figure 8. 5 | ABE IEEE 802.3 MICRO REPEATER Figure 8: AT-MR127F Back Panel The back panel of the AT-MR127F Miero Repeater shows the power receptacle, Port 1, the BNC port — including the 50 Q termination switch — and Port 2, the two fiber optic connections (again, either two ST or two SMA connectors). There is also the user-selectable switch for either full- or half-repeater mode of operation. These features will be discussed in more detail in . Table 5 summarizes the functional differences between the AT-MR117F and the AT-MR127F. Table 5: AT-MR1x7F Fiber Optic Micro Repeaters Power Model Supply Port 1 Port 2 AT-MR117F-x1 External 10BASE? 10BASE-FL/FOIRL (BNC) (SMA) AT-MR117F-x3 External 10BASE? 10BASE-FL/FOIRL (BNC) (ST) AT-MR127F-x1 Internal 10BASE? 10BASE-FL/FOIRL (BNC) (SMA) AT-MR127F-x3 Internal 10BASE2 — 10BASE-FL/FOIRL (BNC) (ST) The AT-MR118FT and AT-MR128FT Both AT-MR118FT and AT-MRI128FT Micro Repeaters are functionally identical to the other members of the Micro Repeater family respectively with the exception of the non-fiber optic media connectivity. AT-MR118FT and AT-MRI128FT Micro Repeaters employ a 10BASE-T UTP wire medium. Like the AT-MR1x6F series as well as the AT-MR1x7F series, the AT-MR118FT 1s functionally identical to the AT-MR128F'T in all respects except for the power supply: the AT-MR118FT has an external power supply, the AT-MR128FT has an internal power supply. As previously stated, the physical dimensions are the same for all members of the Micro Repeater family and were given in Table 3 and Table 4. The front panel of the AT-MR118FT CentreCOM Micro Repeater is shown in Figure 9. MAY? RECEIVE >) (Allied ario a TRANSMIT О J C= CentreCOM™ PORT 1: 10BASE-T MR 1 18FT IEEE 802.3 MICRO REPEATER PORT 2: 10BASE-FL/FOIRL Figure 9: AT-MR118FT Front Panel The front panel of the AT-MR118FT CentreCOM Micro Repeater shows the power LED and activity LEDs (On Line, Collision, Receive, Transmit and Link) for both the 10BASE-T (Port 1) and the 10BASE-FL/FOIRL (Port 2) receptacles. The back panel of the AT-MR118FT CentreCOM Micro Repeater is shown in Figure 10. PORT 2 PORT 1 AVS ga = — nternationa RJ45 PIN-OUT CentreCOM O O wae [Jeu 0 MDI X MRTISFT OO MICRO REPEATER TX REPEATER AX 10BASE-FL/FOIRL 10 BASE-T POWER Figure 10: AT-MR118FT Back Panel The back panel of the Micro Repeater shows the power receptacle. It also shows Port 1, the 10BASE-T port, including the RJ45 pin-out, a straight-through/cross- over cable selection switch (MDI/MDI-X) and Port 2, the two 10BASE-FL/FOIRL connections (again either two ST or two SMA connectors). Port 2 also includes the user-selectable switch for either full- or half-repeater mode of operation. All of these features are discussed in more detail in . 10 The front panel of the AT-MR128F T 1s shown below in Figure 11. AVES EE CentreCOM” MR128FT IEEE 802.3 MICRO REPEATER PORT 1: 10OBASE T PORT 2: 10BASE FL .FOIRL Figure 11: AT-MR128FT Front Panel The back panel of the AT-MR128FT is shown below in Figure 12. MAYO 252) CentreCOM” POWER MR128F T Figure 12: AT-MR128FT Back Panel PORT 1 RAS PIN-OUT wo [Jo ul 10BASE-T Table 6 summarizes the differences between the AT-MR118FT and the AT-MR128FT. Table 6: AT-MR1x8FT Fiber Optic Micro Repeaters Model Power Port 1 Port 2 Supply AT-MR118FT-x1 External 10BASE-T 10BASE-FL/FOIRL (RJ45) (SMA) AT-MR118FT-x3 External 10BASE-T 10BASE-FL/FOIRL (RJ45) (ST) AT-MR128FT-x1 Internal 10BASE-T 10BASE-FL/FOIRL (RJ45) (SMA) AT-MR128FT-x3 Internal 10BASE-T 10BASE-FL/FOIRL (RJ45) (ST) 11 Chapter 2 Connectivity Cable Types Four types of cable can be used with CentreCOM Fiber Optic Micro Repeaters: A Fiber optic (10BASE-FL/FOIRL) CCC Thick Ethernet (10BASES) Thin Ethernet (10BASE2) UTP (10BASE-T) While each type of cable has different advantages and characteristics, they all adhere to IEEE 802.3 specifications. The primary consideration of each type of cable is generally economic: the more expensive the cable, the greater the advantages in terms of the number of available nodes, security, interference protection and maximum distances. Each type of cable is shown in Table 7. Additional details of cabling techniques and port specifications for IEEE 802.3 media are contained in Appendix A on page 23, and should be referred to before installing your network. Table 7: CentreCOM Cable Types Model Power Port 1 Port 2 Supply AT-MR1x6F External or 10BASE5 10BASE-FL/FOIRL Internal (AUI) (SMA or ST) AT-MR1x7F External or 10BASE? 10BASE-FL/FOIRL Internal (BNC) (SMA or ST) AT-MR1x8FT External or 10BASE-T 10BASE-FL/FOIRL Internal (RJ45) (SMA or ST) 13 Fiber Optic 10BASE-FL/FOIRL Cable In general, fiber optic cable: J Isimmune to electromagnetic interference J Can span longer distances without attentuation J Eliminates grounding problems J Is secure from unauthorized taps Configuration The configuration in Figure 13 demonstrates how an AT-MR126F (or AT-MR116F) and an AT-MR117F (or AT-MR127F) can be used to link two networks. Building Backbone 50 © TOBASES Lh so Terminator XCVR | Terminator a or == a ABST) || O20 —— CRS | 0 J 2,000 Meters Max. Multimode Fiber Optic Cable (020) HO EE) LEGEND 10BASES — 10BASE-FL AUI drop Figure 13: AT-MR126F to AT-MR117F Configuration 14 The configuration in Figure 14 demonstrates how an AT-MR118FT and an AT-MR128FT can be used to link two networks. Note that, when thick Ethernet 10BASES connections are joined with a different medium such as 10BASE-T, 10BASE-FL, ete., an appropriate transceiver must be employed. In this instance, Allied Telesyns’ Fiber Optic CentreCOM Micro Transceiver (AT-MX25F or AT-MX26F) would fulfill this requirement as would any equivalent transceiver from any other source. Building Backbone so 10BASES О 50 © Terminator XCVR Terminator AUVUTP hub of A Ad am onan." ua. (am DD LEGEND 10BASES sess 10BASE-T +----------- 10BASE-FL — 7 — AUI drop Figure 14: AT-MR118FT to AT-MR128FT Configuration activated (MDI = ON) on both AT-MR118FT and AT-MR128FT Micro Repeaters, thus enabling a hub-to-hub connection using straight- through cable. Note Uy This configuration assumes that the RJ45 Pin-Out switch has been | — 4 RJ45 Pin-Out Switch The RJ45 Pin-Out switch on the back panels of the AT-MR118FT and AT-MRI28FT Micro Repeaters converts Port 1 to an uplinkable port and, therefore allows one hub to connect to another hub in a star topology without the use of special cross-over cables. The default setting for the RJ45 Pin-Out switch is MDI-X (standard RJ45 port). 15 If you want to use Port 1 to connect (uplink) two hubs, then the RJ45 Pin-Out switch of only one hub must be set to the uplinkable position MDI. The MDI position is basically a hub pin-out which automatically swaps the TX and RX pin- outs such that they do not conflict with the TX and RX ports at the other end of a straight-through cable. If you connect a straight-through cable (or any cable for that matter) between two hubs (or any two nodes), and the network LEDs do not indicate the passage of packets, change the position of the MDI/MDI-X switch. The repeater will not be harmed if the MDI switch is in the wrong position. In the configuration shown in Figure 14 on page 15, two buildings are linked by fiber optic cabling and the signals are distributed by UTP. This technique takes advantage of the stronger fiber optic signal and the less expensive UTP signal technique. Fiber Cable Connectivity CentreCOM Fiber Optic Micro Repeaters support 100/140 micron, 62.5/125 micron, and 50/125 micron duplex optical fiber cable (‘duplex’ refers to fiber optic cable pairs). Normally, duplex fiber optic cable is labeled TX or TD (transmit) and RX or RD (receive). This means it has a dedicated transmit cable and a dedicated receive cable. The receiving port (RX or RD) on one device must be mated to the transmitting (TX or TD) port on a second device for proper connectivity. Fiber Cable Length—The IEEE FOIRL (fiber-optic inter-repeater link) standard limits a fiber segment length to 1 km. That is, the fiber optic cable that connects two repeaters is limited to 1 km. On the other hand, the more recent IEEE 10BASE-FL standard limits a fiber segment length to 2 km. Note, however, that this only applies to topologies in which one 10BASE-FL node connects to another 10BASE-FL node. If one end of a 10BASE-FL connection is to a FOIRL connection the limitation would revert to the lesser distance of 1 km. What will happen if you accidently connect the TX cable of one device to the TX port of another device? Or RX to RX? Nothing! There will be no damage. The link port LED will not illuminate which means there 1S no connectivity. ST or SMA As previously noted, the fiber optic port can be ordered with either an ST or SMA interface. The difference between the two is fundamental: an ST connector uses a bayonet type interface; the SMA connector uses a screw-on, threaded interface. On the other hand, while Allied Telesyn sells both ST and SMA connectors it should be noted that many existing (usually older) networking environments use SMA (or Biconic) connectors which are not physically compatible with ST connectors. 16 The five common modular cable specifications and their applicability to 10BASE-T network use are shown in Table $. Table 8: Usable and Unusable Twisted Pair Cable Cable Cable en Twist/ | 10BASE-T Level | Description AC Character | Specification Fool OK? 1 Unshielded N/A CCITT None NO! Untwisted 2 Individual 100 © +30 2 RS232 None NO! UTP 1BASES AT&T PDS 3 Typical 100 © +15 © T1, AT&T 3-5 YES Individual ISDN UTP 10BASE-T IBM Type 3 4 Enhanced 100 Q +30 Q EIA, TIA 5-8 YES Individual 10BASE-T UTP NEMA 5 Individual 100Q+30Q EIA, TIA 8-10 YES UTP 10BASE-T UTP Port Wiring The AT-MR118FT and AT-MR128FT both have a 10BASE-T UTP port with an industry-standard RJ45 receptacle and a RJ45 pin-out switch. The RJ45 pin-out straight-through (MDI)/crossover (MDI-X) switch enables you to use a straight- through cable during hub-to-hub connectivity by simply placing the switch in the MDI position. 24 RJ45 PIN RJAS PIN Par IEEE 802.3 specifications Figure 16: 10BASE-T UTP Cabling Hub-to-MAU or NIC (Straight-Through) The standard connection when using a micro repeater is from a Data Communications Equipment (DCE) device, such as the repeater, to a DTE device, such as a workstation NIC. This configuration uses a straight-through cable (see Figure 16) with the switch in the MDI-X position. 25 Some situations require a DCE-to-DCE connection, for example when hubs are cascaded. This can be accomplished with a standard crossover cable, as illustrated in Figure 17. By setting the switch to MDI, you may use a straight-through cable, eliminating the need for making or obtaining a crossover cable. RJ45 PIN RJ45 PIN Per IEEE 802.3 specifications (1) TD + [TE то - 3 RD + (4) Not Used (5) Not Used (7) Not Used Not Used Note Y Figure 17: 10BASE-T UTP Cabling Hub-to-Hub (Crossover) The interface type that IEEE specifies as standard for a repeater such as the AT-MR1x8F'Tis MDI-X. The straight-through/crossover switch merely provides convenience to avoid having to obtain an alternate cable in some applications. If you connect a cable and it does not work, try changing the MDI switch. The rule of thumb is the total number of crossovers must be odd. You cannot harm the repeater by having the MDI switch in the wrong position. Table 9 shows which position the straight-through/crossover selection switch needs to be for the device configuration shown. 26 Table 9: MDI and MDI-X Switch Settings for Common Connection’ Model Connected to MDI MDI-X AT-MR118FT/AT-MR128FT Hub X AT-MR118FT/AT-MR128FT RJ45 Transceiver X AT-MR118FT/AT-MR128FT NIC X 1. This table assumes a straight-through cable is being used. The switch setting are the opposite of what is shown if a crossover cable is being used. In both the crossover and straight-through instances, the wire is twisted pair. Figure 18 demonstrates usable and unusable cable configurations for the straight- through wire pairing in the UTP environment. A [1] Parr twisted as per Level 3, 4 or 5 cable. RJ45 Pin RJ45 Pin TDs (1) В (7 TD+ TD- O, a (2) TD- This cable will not work for 10BASE-T. Note that 3 and 6 are twisted, but are not a pair. RJ45 Pin RJ45 Pin то» O, — (1) то» TD- (2) QE TD- AD. (3) - —(3) RD- No! Used (4) Q (4) Not Used Not Used ( 5 (5) Not Used © QA ro. Not Used O - 7) Not Used Not Used a (8) Not Used Figure 18: Hub-to-MAU Wiring Usable (A) and Unusable (B) Diagram A is correct because the proper pairs are twisted together. Diagram B 1s Incorrect because the wires for the receive pair, pins 3 and 6, are not twisted together. This could result in excessive common mode noise and an unacceptably high data error rate. 27 If you pair pins incorrectly, for example as shown in Figure 18, Diagram B, your network may have a high data error rate. In a straight-through cable, the transmit pins, 1 and 2, are paired, as are the receive pins, 3 and 6. In a crossover cable (not shown), pins 1 and 2, TD+ and TD-, are paired, as are pins 3 and 6, RD+ and RD-. When pins 1 and 2 are crossed over, they connect to pins 3 and 6 respectively, and pins 3 and 6, when crossed over, connect to pins 1 and 2 respectively. See Figure 19 for the location of pin 1 so you can count your pins correctly. On an RJ45 connector, it is important to know where pin 11s so you can count your pins correctly. Figure 19 shows the location of pin 1. Pin 1 Figure 19: Pin 1 Orientation on an RJ45 Connector 10BASE-FL/FOIRL Ethernet The IEEE 802.3 10BASE-FL standard supports up to 2,000 meters (6,560 ft.) of multimode duplex fiber optic cable in a point-to-point link which directly attaches two devices. Duplex refers to support for fiber optic cable pairs, enabling a two- cable fiber optic connection with transmit mode dedicated to one cable and receive mode on the other. 10BASE-FL supports connections of 2,000 meters (6,560 ft.) while Fiber Optic Inter-Repeater Link(FOIRL) supports connections of 1,000 meters (3,280 ft.). 10BASE-FL is compatible with FOIRL, but restricts distance to 1,000 meters (3,280 ft.) You can intermix 10BASE-FL and FOIRL nodes, but if the cable connects a 10BASE-FL node at one end and a FOIRL node at the other, the limitation would revert to the lesser distance of 1 km (3,280 ft.). 10BASES (Thick) Ethernet When configuring 10BASES coax segments, IEEE 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 10BASES5 cable segment cannot exceed 500 meters (1,640 ft.) in length. Worst case “end-to-end” propagation delay of a 10BASES5 coax segment is 2165 ns. Propagation delay of 10BASES Ethernet coax is calculated at 4.33 ns/meter. Both ends of the segment must be terminated with a 50 Q termination with a power rating of 0.5 watts or greater. Earth grounding of the segment shield must take place at only one point on the cable. 28 AUI Drop Cables AUT 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. AUT cables may have a maximum 257 ns propagation delay, as used for computing the worst case propagation delay of a cable system. AUT cable propagation delay 1s approximately 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 1s nominally 78 Q. The AUI cable typically connects a transceiver attached to a coaxial segment to a DTE (workstation). 10BASE2 (Thin) Ethernet When configuring thin coax segments, IEEE 802.3 specifications allow 29 or fewer MA Us per cable segment spaced at no less than 0.5 meter (1.64 ft.). The 10BASEZ2 cable length cannot exceed 185 meters (607 ft.) per 10BASE2 cable segment. The worst case propagation delay for a 185 meters (607 ft.) thin Ethernet segment is 950.9 ns. The propagation delay for 10B ASE2 Ethernet cable is 5.14 ns/meter. Both ends of the segment must be terminated with a 50 Q termination with a power rating of 0.5 watts or greater. Earth grounding of the segment shield must take place at only one point on the cable. 29 Appendix B Glossary 10BASE2—Also called thinnet Ethernet, thinnet or CheaperNet, a 10 MHz baseband specification. Cable impedance is 50 Q and maximum coaxial segment length is 185 meters (607 ft.). 10BASE5—AIso called thick Ethernet, a 10 MHz baseband specification. Cable impedance is 50 Q and maximum coaxial segment is 500 meters (1,640 ft.). The cable is commonly referred to as yellow cable. Thick Ethernet cable is typically used as a trunk or backbone path of the network. 10BASE-FL—IEEE 802.3 Fiber Optic Ethernet. A fiber optic standard that allows up to 2,000 meters (6,560 ft.) of multimode duplex fiber optic cable in a point- to-point link. 10BASE-T—IEEE 802.3 UTP Ethernet. Using low cost Level 3 or better UTP wiring, 100 meters (328 ft.) of point-to-point link segments are possible. Uses RJ45 connectors and sometimes 50-pin AMP connectors to a patch panel. Runs at 10 MHz. 50-PIN TELCO (RJ21)—This connector is very common in 10BASE-T wiring. As opposed to the RJ45 connector, the 50-pin Telco connector concentrates up to 12 UTP connections onto one connection. This concentration of UTP ports is then broken out for connection to a punch-down block inside a building’s wiring closet. 50-pin Telco connections provide a very clean, uncluttered interface to the building’s wiring. AT-ADAPT-2— A harmonica-style adapter that allows direct conversion from a 50-pin Telco connector to RJ45 receptacles. | ATTACHMENT UNIT INTERFACE (AUI)—Connection between a MAU (transceiver) and a DTE (typically a workstation). Includes a 15-pin D-sub connector and sometimes a 15-conductor twisted pair cable. Maximum length is 50 meters (164 ft.). BACKUP MODULE— A repeater that behaves as the management module when the Master fails in a department concentrator. BASEBAND COAXIAL SYSTEM—A system whereby information is directly encoded and impressed on the coaxial transmission medium. At any point on the medium, only one information signal at a time can be present without disruption. BAYONET NUT COUPLE (BNC) CONNECTOR—A 10BASEZ2 thin coax connector with push-on BNC locking lug that quickly locks into place with a half twist. 2 DATA COMMUNICATION EQUIPMENT (DCE)—In RS232 specification a module, such as a modem, for connecting a DTE to other equipment. A repeater connected to a terminal or workstation for OMEGA LOCAL management use is wired as a DCE. DATA TERMINAL EQUIPMENT (DTE)—In RS232 specification a module typically at the end of a segment. The DTE could be an Ethernet workstation, repeater or bridge. DEPARTMENT CONCENTRATOR—Hub which provides a large number of workstation connections. The term, department concentrator, refers to multiple repeaters housed in an AT-36C8 chassis. See Hub/Repeater, Repeater. DIX CONNECTOR—See D-Sub Connector FOIRL — A fiber optic standard that allows up to 1,000 meters (3,280 ft.) of multimode duplex fiber optic cable in a point-to-point link. HARMONICA ADAPTER—This adapter provides a simple way to convert the 50-pin Telco connection to RJ45 connections. HEARTBEAT—See SQE HOT SWAPPING— The process of replacing a hub module without bringing down the network. This process occurs by sliding an active module into a fully powered up concentrator, replacing a failed module. HOUSE WIRING—House wiring is the existing wiring inside a building. This wiring generally originates from one or more wiring closets such as a telephone room. Some older buildings may have wiring unsuitable for 10 megabit data rates. In these circumstances, it is recommended that the wiring is tested with a 10BASE-T signal/wire tester. 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, 10BASEZ2 and fiber optic (10BASE-FL, FOIRL) repeaters are considered hubs. See Repeater. HUB-to-HUB WIRING—See MAU-to-MAU Wiring HUB-to-MAU WIRING—UTP cables for 10BASE-T hub-to-MAU or NIC cards are wired straight-through. An RJ45 receptacle at the hub would wire pin-to-pin to the RJ45 receptacle at the MAU. 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 LOCK-UP—The MAU's ability to automatically inhibit the transmit data from reaching the medium if the transmit data time exceeds a specified duration. This duration is in the range of 20 ms to 150 ms. Jabber lock-up protects the medium from being overrun with data packets from a possibly defective device. 33 JAM—This is a term used to describe the collision reinforcement signal output by the repeater to all ports. The jam signal consists of 96 bits of alternating 1s and Os. The purpose is to extend a collision sufficiently so that all devices cease transmitting. JITTER—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 together such as repeaters. LINK TEST—In 10BASE-T Ethernet there is a link test function that validates the UTP link. This consists of a pulse transmitted from point A on one pair and validated at point B. Point B also transmits a pulse on the second pair to be validated by point A. These pulses occur during media idle states (in between packets). MANAGED MODULE— An intelligent repeater in a department concentrator chassis that makes management data available to the Master. MANAGEMENT AGENT—Software that is used to view hub activity and set hub variables. MASTER—A repeater in the top-most position in a department concentrator chassis that contains and downloads the management agent software to Backup and Slaves. The Master contains the only active image of the management agent and controls the management functions of the Backup and Slaves. 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 crossover cable located somewhere along the UTP cable run. This may commonly occur at the punch-down block or between the RJ45 wall receptacle and the workstation. MAU/TRANSCEIVER— An Ethernet transceiver isa MAU. À 10BASE-T MAU interfaces the UTP media to an AUI port on a workstation, repeater, bridge or other Ethernet devices. MDI/MDI-X—See Medium Dependent Interface 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 the trunk cable medium and the MAU. MDI-X is another version of the interface that enables like devices to connect, using different pin- outs, avoiding conflicts that occur when receiving and transmitting packets use the same pin-out. MODULE—A single repeater when it is mounted with other repeaters in an AT-36Cx or AT-36 Ex department concentrator chassis. 34 N-SERIES—A barrel shaped, threaded connector used on 10BASES (thick Ethernet) coaxial cable. PATCH PANEL—A 10BASE-T patch panel may be between a punch-down block and UTP workstation. The patch panel generally has a female RJ45 connector on the front for each workstation anda Telco (RJ21) connector on the back, which are wired to a punch-down block. This provides a convenient way for the installer or network manager to connect the hub 10BASE-T ports into the desired building locations. PHYSICAL MEDIUM ATTACHMENT (PMA)—The portion of the MAU that contains the functional circuitry. PHYSICAL SIGNALING (PLS)—That portion of the physical layer contained Within the DTE that provides the logical and functional coupling between MAU and data link layers. POLARITY CORRECTION—Many 10BASE-T UTP ports have a polarity correction function. If the UTP wiring has RD-and RD+ inadvertently crossed, the polarity correction function will sample the signal and electrically swap the wires. If the TD- and TD+ wires are crossed, the correction would occur at the MAU on the other end of the UTP link. This occurs within a single pair and should not be confused with the crossover 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 maximums for computing propagation budgets when designing a LAN. Cable length plays a major role in propagation delay. [i.e, a 50 meters (164 ft.) AUT cable has a maximum allowable propagation delay of 257 ns.] The propagation delay of cable is dependent on length and velocity factor of the cable type. There are also propagation delays associated with electronics attached to the system. 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 length. Repeaters perform the basic actions of restoring signal amplitude, waveform and timing applied to normal data and collision signals. RJ45—This connector is a 10BASE-T standard for connecting UTP cabling. They are Inexpensive and easy to install onto UTP cable. 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. 35 SIMPLE NETWORK MANAGEMENT PROTOCOL (SNMP)— SNMP is a TCP/IP protocol that generally uses the User Datagram Protocol (UDP) to exchange messages between a management information base and a management client residing on a network. Since SNMP does not rely on the underlying communication protocols, it can be made available over other protocols, such as XNS or DECnet. SLAVE— A repeater that behaves as a “dumb” module managed by a Master in a department concentrator chassis. Slaves operating standalone perform only simple regeneration and retiming tasks associated with repeating and are not manageable. 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 SQL Test. STANDADLONE—Repeater operating as a hub on its own; i.e., not a module among other modules in a department concentrator chassis. 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. TCP/IP PROTOCOLS—A set of protocols for inter-computer communication, including network level (Internet Protocol), transport level (Transmission Control Protocol or TCP), and application level protocols (for example, Telnet terminal emulation). TCP/IP has been used for many years in two country-wide networks, the ARPANET and MILNET. Recently, TCP/IP has become very popular with users of a variety of multi-user computer systems and engineering workstations. Most UNIX computers use TCP/IP over Ethernet as the main inter-computer networking technology. TCP/IP is also popular among PC users, particularly as a means of communication with large multi-user computers. TELCO CONNECTOR— A 50-pin receptacle that plugs into the front of the hub, enabling cables from external devices to connect to the hub. THICK ETHERNET—See 10BASES THIN ETHERNET—See 10BASE2 TRUNK CABLE—The trunk coaxial cable system. UNMANAGED MODULE— A repeater that behaves as a “dumb” repeater in a department concentrator chassis (i.e., without a Master). It performs simple repeating tasks like packet retiming and regeneration, but is not managed. 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 Q. Level 3 and Level 4 UTP cable generally fits these criteria. 36 Index A adapters AT-ADAPT-2 45 harmonica 47 Telco 50-pin/RJ45 47 Application Specific Integrated Cir- cuit (ASIC) 15 Attachment Unit Interface (AUI) 45 AUI 43, 46 AUI drop specification 43 B baseband coaxial system 45 bit rate 46 bit time 46 C cabling 10BASE2 43, 45 10BASES 45 10BASE-FL 27, 45 10BASE-T 45, 46 cross-over 46 FOIRL 27, 47 impedance 45, 47 straight-through 50 UTP (10BASE-T) 27 carrier sense 46 carrier sense multiple access with collision detect (CSMA/CD) 46 coax segment 46 coaxial cable 46 coaxial cable segment 46 Collision 19, 30 collision presence 46 compatibility interface 46 compliance four repeater rule 31 IEEE 802.3 45, 46 IEEE 802.3 specification 27 configuration standalone 50 connectors 50-pin Telco 45, 47 bayonet nut couple connector 45 DIX 47 D-sub 46 N-series 49 RJ45 45, 47, 49 D Data Communication Equipment (DCE) 47 Data Terminal Equipment (DTE) 47 department concentrator 45, 47 DTE 43, 45, 46 E Ethernet 42, 45 F fiber optic 31, 45 H harmonica adapter 47 hot swapping 47 hub/repeater 47 41 I indicator collision 46 heartbeat 47 link test 48 J jabber lock-up 47 jam 48 jitter 48 L LAN 46 link segment 48 M managed module 48 management agent 48, 50 management agent 48 MAU 43, 46, 48 MAU/transceiver 48 MDI/MDI-X 48 Medium Attachment Unit (MAU) 48 Medium Dependent Interface (MDI) 48 module 48 backup 45 master 48 slave 50 O On Line 19 P Packet Retiming Controller (PRC) 31 patch panel 49 Physical Medium Attachment (PMA) 49 Physical Signaling (PLS) 49 polarity correction 49 Power 19 propagation delay 49 punch-down block 49 42 R Receive 19 repeater 45, 48, 49, 50 full-repeater/half-repeater 31 repeater, full full-repeater mode 31 switch S Signal Quality Error (SQE) 49 Simple Network Management Proto- col (SNMP) 50 SQE test 50 Surface Mount Technology (SMT) 15 T TCP/IP protocols 50 Telco connector 50 Transmit 19 U unmanaged module 50 Unshieled Twisted Pair (UTP) 50 UTP 45 W wiring 27, 43, 45, 46, 47, 50 AUI drop, specification 43 branch cable 46 house wiring 47 hub-to-hub 47 hub-to-MAU 47 MAU-to-MAU UTP, hub-to-hub 48 thick Ethernet 50 thin Ethernet 50 trunk cable 50
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