Manuale d’uso / di manutenzione del prodotto 100 TX del fabbricante 3Com
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® L INK B UILDER ® FMS ™ 1 00- TX H UB U SER G UIDE A member of the 3Com LinkBuilder FMS family Part No. 09-0889-000 Published March 1996.
ii 3Com C orporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8145 © 3Com Corporation, 1996. All rights reserved. No par t of this documentation may be r eproduced in any form or b y any means or used to make any derivativ e work (such as translation, transformation, or adaptation) without permission from 3Com Corporation.
iii C ONTENTS A BOUT T HIS G UIDE Introduction 1 How to Use This Guide 1 Con ventions 2 1 I NTRODUCTION General Description 1-1 Management Unit 1-3 Hub Functions 1-4 2 I NSTALLING THE FMS 100-TX H UB .
iv Using T ransceiver Interface Modules 3-6 Considerations for Multisegmented Networks 3-7 Classification of Repeaters 3-9 Class I Repeaters 3-9 Class II Repeaters 3-10 LED D escriptions 3-11 Status .
v I NDEX L IMITED W ARRANTY FCC C LASS A V ERIFICATION S TATEMENT CISPR A C OMPLIANCE CE N OTICE.
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vii F IGURES 1-1 F ront P anel of LinkBuilder FMS 100-T X Hub 1-2 1-2 Rear P anel of LinkBuilder FMS 100-TX Hub 1-2 2-1 Attaching a Bracket for Rack Mounting 2-3 2-2 Rack Mounting a Single Hub 2-3 2-3.
viii T ABLES 1-1 Supported IEEE 802.3 Repeater F unc tions 1-4 2-1 T ransceiver Inter face Modules 2-5 3-1 LinkBuilder FMS 100-TX Hub Network Connections 3-1 3-2 P or t LEDs 3-11 3-3 Hub Operation LED.
A BOUT T HIS G UIDE Introduction This guide describes how to mount the 3C om ® LinkBuilder ® FMS ™ 100-TX Hub in a rack, install the hub on the network, and interpret the hub ’ s front panel LEDs. It also describes, in general terms , the functioning of the hub in a F ast Ethernet network en vironment.
2 A BOUT T HIS G UIDE C on ven tions The follo wing table lists the notice icons that are used throughout this guide . Icon Type Description Information Note Information notes call attention to important features or instructions. Caution Cautions alert you to personal safety risk, system damage, or loss of data.
1 I NTRODUCTION The LinkBuilder ® FMS ™ 100-TX Hub is a member of the 3Com ® SuperStack ™ system of stackable network devices. The 100 designation ref ers to 100BASE-T F ast Ethernet, which is an extension of the Ethernet IEEE 802.3 specifications.
1-2 C HAPTER 1: I NTRODUCTION Figur e 1-1 Fr ont Panel of LinkBuilder FMS 100-TX Hub Each por t (including the thir teenth port) is supplied with three LEDs that provide activity , link, and par tition status inf ormation. Additional LEDs provide repeat er classification, environmental, and port status information.
Management Unit 1-3 The two expansion connectors are used f or adding components (additional hubs or a Management Unit) to create a hub stack. The LinkBuilder FMS 100-T X Hub can be used as a stand-alone repeater or as a stacked unit with other LinkBuilder FMS 100 Hubs.
1-4 C HAPTER 1: I NTRODUCTION Hub F unc tions The LinkBuilder FMS 100-TX Hub suppor ts the standard functions of an IEEE 802.3 repeater , as listed in T able 1-1.
2 I NSTALLING THE FMS 1 00- TX H UB This chapter discusses the f ollowing topics: ■ Unpacking the hub ■ P ositioning the hub ■ Installing the hub ■ Installing the transceiver interface modules.
2-2 C HAPTER 2: I NSTALLING THE FMS 100-TX H UB If you ordered one or mor e transceiver interface modules, they will be packaged separately from the hub . P ositioning the Hub When deciding where to place the hub , make sure the environment meets the following conditions: ■ The hub is accessible and cables can be connected easily .
Installing the Hub 2-3 Rack Mounting The hub is supplied with two brackets and four scr ews for rack mounting in a standard 19-inch rack. The four rubber f eet that are shipped with each hub are not used for rack mounting .
2-4 C HAPTER 2: I NSTALLING THE FMS 100-TX H UB 6 Attach brackets to both sides of the other hubs to be rack-mounted , as described in steps 2 through 4. 7 Inser t each hub into the rack and fasten each one individually to the rack uprights, as shown in F igure 2-3.
Installing the Transceiver Interface Modules 2-5 Desktop Placement If you place the hub on a desk or table , attach the supplied rubber feet to each bottom corner of the hub . If you stack additional hubs on top of the bottom one , place rubber feet on the bottom of each corner of each hub in the outline shown on the unit’ s base.
2-6 C HAPTER 2: I NSTALLING THE FMS 100-TX H UB CA UTION: Each module is packed in antistatic material to protect it during shipment. T o avoid damaging any static-sensitive c omponents after remov al from the container , be sure to reduce any static electricity on your person.
Using the Redundant Power System 2-7 3 Carefully remo ve the transceiver int er face module fr om its shipping container . 4 Slowly insert the module into the slot, being careful not to damage any of the components or connecting pins. The module will slide into the hub f ollowing the tracks in the slot.
2-8 C HAPTER 2: I NSTALLING THE FMS 100-TX H UB The RPS cables are inserted into the DC input connectors on the hubs’ rear panels. Remove the rubber protective cover fr om each DC input connec t or before connecting the RPS cable. Figur e 2-6 shows the RPS mounted on top of a four-hub stack and connected to each hub .
Replacing the Fuse 2-9 Replacing the F use If the hub’ s power (PWR) LED was lit initially but is no longer lit, one of the following conditions ma y have caused the LED t o go out: ■ The unit may be disconnected from its A C power sour ce. ■ If connected to an RPS, the unit may be disconnected from its DC power source.
2-10 C HAPTER 2: I NSTALLING THE FMS 100-TX H UB 4 Remove the burned-out fuse by pulling it straight out of its socket, as shown in F igure 2-8. Figur e 2-8 Removing the F use If you wish, you can store a spar e fuse in the front section of the fuse-holder .
3 M AKING FMS 1 00-TX H UB C ONNECTIONS This chapter discusses how t o use the LinkBuilder FMS 100-TX Hub in various network en vironments. The chapter also discusses how to int erpret the hub ’ s LEDs and how to use the pow er-up disabled option.
3-2 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Hub to Node Once installed , the hub can suppor t up to 12 end node connections. F igure 3-1 shows 11 PCs and one ser ver connected to the RJ-45 ports on the hub ’ s front panel. Y ou can connec t any combination of PCs , ser v ers, and other hubs to the 12 RJ-45 ports.
Making Network Connections 3-3 Figur e 3-2 Pin Assignments f or Straight-Through Cabling The pin assignments for the 100BASE-TX transceiver interface module are the same as the pin assignments for the RJ-45 ports on the hub’ s front panel. F igure 3-3 shows the RJ-45 connector pin assignments.
3-4 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Hub-to-Hub Interc onnection Y ou can interconnect up to eight hubs , using expansion cables to form one logical unit.
Making Network Connections 3-5 Hub to Management Unit Y ou can connect the hub (or a hub stack) to a Management Unit by using the expansion cable. Connect the UP expansion por t on the hub ’ s rear panel to the DOWN expansion port on the M anagement Unit’ s rear panel, as shown in F igure 3-5.
3-6 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Hub to Backbone Y ou can connect hubs and hub stacks to the network backbone through the transceiver interface module on the rear panel via a bridge, router , or switch, using either Category 5 UTP or fiber cabling.
Considerations for Multisegmented Networks 3-7 C onsidera tions for Multisegmented Networks The 100BASE-T technology defined in the IEEE 802.3 standard pr ovides for both homogeneous CSMA/CD 100 Mbps networks and heterogeneous 10/100 Mbps mixed networks .
3-8 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Figur e 3-7 10 and 100 Mbps Collision Domains C onnec ted b y a Switching Hub A F ast Ethernet packet transmitted on a LAN c an pass through no mor.
Classification of Repeaters 3-9 Classification of Repeaters T he IEEE 802.3 standard defines two classes of repeat ers for 100BASE-T F ast Ethernet networks , as detailed below .
3-10 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Class II Repeaters A Class II r epeater is a hub with internal dela y such that no more than two hubs can exist between any tw o DTE devices within a single collision domain when two maximum-length cable segments are used .
LED Descriptions 3-11 LED Descriptions The LinkBuilder FMS 100-TX Hub is equipped with front panel LEDs to provide port status and hub information (see F igure 3-10). Figur e 3-10 LED Indicators Status LEDs T able 3-2 interprets the meaning of the por t ST A TUS LEDs.
3-12 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Operation LEDs T able 3-3 interprets the meaning of the hub operation LEDs. Unit Digital Display The front panel unit digital display (see F igure 3-11) provides a numeric designation for each component in a hub stack, including a M anagement Unit if one is present.
Power-Up Disabled Option Switch 3-13 Pow e r - Up Disabled Option S witch If network management is present, an ex ternal switch on the hub ’ s rear panel allows you to po wer-up the hub with the ports disabled. T he power-up disabled option switch is located between the expansion connectors and the DC input connector , as shown in F igure 3-12.
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4 C ABLING The LinkBuilder FMS 100-TX Hub suppor ts F ast Ethernet cabling and topology requirements , as detailed in the IEEE 802.3 specification. F ast Ethernet preserves the 100-meter maximum UTP cable length from the hub to the desktop that is a requirement f or 10 Mbps Ethernet.
4-2 C HAPTER 4: C ABLING T ransceiv er Interface Module Cabling Requirements The two transceiv er inter face modules provide downlink connectivity to another hub or to a bridge , router , or switch.
Topology Rules 4-3 One Class I Repeater A total network span of 260.8 meters (combined UTP and fiber cabling) is allowed in single-Class I hub topologies (one hub stack per wiring closet with a fiber run to the collapsed backbone). For example , you could use a 160.
4-4 C HAPTER 4: C ABLING If greater distances and more ports are required , you can use an internetworking device (such as a bridge, router , or switch) to isolate traffic between workgr oups. T his would divide the network into a number of independent segments, as illustrated in Figure 4-3.
A S PECIFICA TIONS This appendix lists the specifications for the LinkBuilder FMS 100-TX Hub . Hub Specifications Physical Dimensions Length: 30.48 cm (12 in.
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B T ECHNICAL S UPPORT 3Com pro vides easy access to technical support information through a variety of ser vices. This appendix describes these ser vices.
B-2 A PPENDIX B: T ECHNICAL S UPPORT Acc ess by ISDN ISDN users can dial-in to 3ComBBS using a digital modem f or fast access up to 56 Kbps. T o access 3ComBBS using ISDN, dial the following number: (.
Support from Your Network Supplier B-3 3ComF ac ts Automated F ax Ser vic e 3Com C orporation’ s interactive fax ser vice, 3ComF acts, provides data sheets , technical articles, diagrams, and troubleshooting instructions on 3Com products 24 hours a day , seven days a week.
B-4 A PPENDIX B: T ECHNICAL S UPPORT Suppor t from 3C om If you are unable to r eceive support from your network supplier , technical suppor t contracts are available fr om 3Com. In the U.S. and Canada, call (800) 876-3266 for customer ser vice. If you are outside the U.
G LOSSARY 10BASE-T The IEEE 802.3 physical la yer specification for a 10 Mbps E thernet network over tw o pairs of Category 3, 4, or 5 UTP wire. 100BASE-FX The IEEE 802.3 physical la yer specification for a 100 Mbps E thernet network over tw o strands of fiber .
2 G LOSSARY Class I A type of 100BASE-T repeater with internal delay such that only one repeater or stack may exist betw een any two end stations within a single collision domain when two maximum-length copper cable segments are used.
G LOSSARY 3 Hub A device used to provide connectivity between network devices. Hubs per f orm the basic repeater functions of restorating signal amplitude and timing, detecting collisions, and broadcasting signals to lower-lev el hubs and network devices.
4 G LOSSARY SuperStack 3Com syst em of stackable hubs, ser v ers, switches, routers , SDL C converters, and power supplies. SuperStack systems can support a range of LAN envir onments, including Ethernet, token ring, FDDI, SNA, and A TM. Thin Ethernet cable A cable standard for Ethernet (IEEE 802.
I NDEX Numerics 100 Mbps media options 100BASE-FX 1-1 required cabling 3-6 100BASE-T4 1-1 100BASE-TX 1-1 required cabling 3-6 100BASE-FX transceiver interface module 1-2 100BASE-T cabling 4-2 topology.
2 I NDEX H hub connections hub to backbone 3-6 hub to Management Unit 3-1, 3-5 hub to node 3-2, 4-2 hub-to-hub interconnection 3-4 description 1-1 functions 1-4 installation 2-2 LEDs 3-11, 3-12 speci.
I NDEX 3 S specifications environmental operating ranges A-1 physical dimensions A-1 power requirements A-1 stacking hubs 1-3 straight-through cabling , pin assignments 3-3 SuperStack family FMS 100 .
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LIMITED W ARRANTY HARDW ARE: 3Com warrants its hardware products to be free from defects in workmanship and materials, under normal use and service, for the following lengths of time from the date of .
FCC CLASS A V ERIFICATION STATEMENT WARNING: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules, and the Canadian Department of Communications Equipment Standards entitled, “Digital Apparatus,” ICES-003.
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Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il 3Com 100 TX è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del 3Com 100 TX - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso 3Com 100 TX imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul 3Com 100 TX ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il 3Com 100 TX, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del 3Com 100 TX.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il 3Com 100 TX. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo 3Com 100 TX insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
