3Com 100 TX manuale d’uso

® 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. 3Co[...]

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 Unpacking the Hub 2-1 P ositioning the Hub 2-2 Installing the Hub 2-2 Rack Mounting 2-3 Desktop Placement 2-5 Installing the T ransceiver Interface Mo[...]

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 LEDs 3-11 Operation LEDs 3-12 Unit Digital Display 3-12 P ower-Up Disabled Option Switch 3-13 4 C ABLING T ransceiver Inter face Module Cabling Requir[...]

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 Installing a Hub Stack in a Rack 2-4 2-4 Attaching a Bracket for Desktop Placement 2-5 2-5 T ransceiver Inter face Modules 2-6 2-6 Connecting the Red[...]

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 LEDs 3-12 3-4 Settings on Po wer-Up Disabled Option Switch 3-13 4-1 Maximum Network Collision D omain Diameters 4-1[...]

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. How to U se This Guide The follo wing ta[...]

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. Warning Warnings alert you to the ri[...]

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. The 100BASE-T specification supports the following 100 Mbps media options: ■ 100BASE-TX (tw[...]

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. (Refer to Chapt er 3 for the int[...]

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. Stacking units provides the benefit of a higher port count, with the stack fun[...]

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. T able 1-1 Supported IEEE 802.3 Repeater F unctions Standard Repeater Function Description Signal retiming Restores the timing and amplitude of the received signal before retransmitting t[...]

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 ■ Using the Redundant P ower Syst em ■ Replacing the fuse Unpacking the Hub When unpacking the hub, f ollow these steps: 1 Open the shipping cont[...]

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 . F or help in p[...]

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 . T o mount the hub in a rack, follow these st eps, which assume you ar e stacking two or more hubs in a rack: 1 Place one of th[...]

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. Figur e 2-3 Installing a Hub Stack in a Rack 8 Repeat steps 2 through 7 when placin[...]

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. T o prevent hub[...]

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. One way to do this is to touch the metal chassis of the hub . Y ou can [...]

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. The lettering that shows the module type must[...]

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 . Figur e 2-6 Connecting the R[...]

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. V erify that the RPS i[...]

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 . 5 Inser t a new fuse, rated at 2 A, 250 V , in the fuse-holder . 6 Push the fuse-holder bac[...]

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. Making Network C onnections T able 3-1 summarizes the possible schemes for connecting the LinkBuilde[...]

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. ( The thir teenth port p[...]

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. Figur e 3-3 RJ-45 Connector Pin Assignmen ts 1 2 3 4 [...]

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. ( The hub expansion cable is also designated the inter-hub bus [IHB] cable.) Inter connecting eight hubs will provide a maximum of 104 ports (96 RJ-45 por ts from the fr ont panel[...]

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. 3Com strongly r ecommends that you plac e the Manag[...]

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. Figure 3-6 shows single and interconnected hubs connected to a network backbone.[...]

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 . Both network topologies can be supported by connecting various LAN segments using repeat ers [...]

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 more than two logical Class II repeaters or one logic al Class I repeater before reaching its destination or passing through a LAN bridge, switch, or rou[...]

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 . Class I Repeaters A Class I r epeater is a hub with internal delay such that only one r epeater can exist between any tw o DTE (data terminal equipment) devices within a[...]

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 . The Class II network topology allows two hubs (or hub stacks) t o exist [...]

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. 12x UNIT ® STATUS 123456789 1 0 1 1 1 2 1 3 ACTIVITY LINK PARTITION CLSII 3C250-[...]

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. Unit numbers are assigned dyn[...]

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. T[...]

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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. Tw o 100 Mbps topology rules are differ ent from those for 10 Mb[...]

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. For transceiv er inter face module connections, the hub suppor ts 100BASE-T functionalit y using the following media specifications: ■ 100BASE-TX: t[...]

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 160.8-meter fiber downlink from the hub t o a router , bridge, or switch with a 100-m[...]

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. Figur e 4-3 Using an Internetworking Device to Extend th[...]

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.) Width: 43.94 cm (17.3 in.) Height: 4.37 cm (1.72 in.) W eight: 5.5 kg (12 lb) Envir onmental Operating Ranges Operating temperature: 0˚ to 40˚ C (34˚ to 104˚ F) Storage temperature: ?[...]

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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. On-line T echnical Services 3Com offers w orldwide produc t suppor t seven days a w eek, 24 hours a day , through the follo wing on-line systems: ■ 3Com Bulletin Board Service (3ComBBS) ■ W o[...]

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: (408) 654 2703 W orld Wide W eb Site Access the latest networking information on 3Com ’ s World Wide Web site b y entering our URL into your Int erne[...]

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. Call 3ComF ac ts using your touch-tone t elephone. International access nu[...]

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.S. and Canada, contac t your local 3Com sales office to find your authorized [...]

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 . 100BASE-T The group of IEEE 802.3 ph ysical layer specifications f or a 100 Mbps Et[...]

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. Class II A type of 100BASE-T repeater with internal delay such that two repeat ers or stacks may exist between an y[...]

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. MA C Media Access Control. The data link sublayer that is responsible f or transferring data t[...]

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 802.3) networks using RG-58 A/U or RG-58 C/U cable and B[...]

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 rules 4-2 100BASE-TX transceiver inter face module 1-2 3Com Bulletin Board Service (3ComBBS) B-1 3Com sales offices B-4 3ComF acts B-3 3ComF orum B-[...]

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 specifications A-1 I installing hub 2-2 desktop placement 2-5 positioning 2-2 rack mounting 2-3 unpacking 2-1 transceiver inter face modules 2-6 inter-hub [...]

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 Management Unit 1-3 FMS 100-T X Hub 1-3 T technical suppor t B-1 thirteenth por t (transceiver interface module por t) 1-1 topology rules, 100BASE-T 4[...]

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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 purchase from 3Com or its Authorized Reseller: Internetworking products One year Network adapters Lifetime Ethernet stackable hubs and Unmanaged Ether[...]

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. These limits are designed to provide reasonable protection [...]

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