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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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