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3Com 100 TX User Manual

3com hub user guide
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Part No. 09-0889-000
Published March 1996
L
B
INK
UILDER
FMS
100-TX H
™
U
G
SER
UIDE
A member of the 3Com LinkBuilder FMS family
®
UB

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Summary of Contents for 3Com 100 TX

  • Page 1 ® A member of the 3Com LinkBuilder FMS family Part No. 09-0889-000 Published March 1996 ® UILDER 100-TX H ™ UIDE...
  • Page 2 95052-8145 © 3Com Corporation, 1996. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without permission from 3Com Corporation.

  • Page 3: Table Of Contents

    ONTENTS BOUT UIDE Introduction 1 How to Use This Guide 1 Conventions 2 NTRODUCTION General Description 1-1 Management Unit 1-3 Hub Functions 1-4 NSTALLING THE FMS 100-TX H Unpacking the Hub 2-1 Positioning the Hub 2-2 Installing the Hub 2-2 Rack Mounting 2-3 Desktop Placement 2-5 Installing the Transceiver Interface Modules 2-5...
  • Page 4 Unit Digital Display 3-12 ABLING Hub to Connected Workstations 4-2 One Class I Repeater 4-3 UPPORT 3Com Bulletin Board Service B-1 Access by Modem B-1 Access by ISDN B-2 World Wide Web Site B-2 3ComForum on CompuServe B-2 3ComFacts Automated Fax Service B-3...
  • Page 5 NDEX IMITED ARRANTY FCC C LASS ERIFICATION TATEMENT CISPR A C OMPLIANCE CE N OTICE...
  • Page 7 3-9 Class II Hubs 3-10 3-10 LED Indicators 3-11 3-11 Unit Digital Display 3-12 3-12 Power-Up Disabled Option Switch 3-13 4-1 Connecting the Hub to a Workstation 4-2 4-2 Connecting the Hub in a Network Span of 260.8 Meters 4-3...
  • Page 8 1-1 Supported IEEE 802.3 Repeater Functions 1-4 2-1 Transceiver Interface Modules 2-5 3-1 LinkBuilder FMS 100-TX Hub Network Connections 3-1 3-2 Port LEDs 3-11 3-3 Hub Operation LEDs 3-12 3-4 Settings on Power-Up Disabled Option Switch 3-13 4-1 Maximum Network Collision Domain Diameters 4-1 viii...

  • Page 9: About This Guide

    Introduction This guide describes how to mount the 3Com 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 Fast Ethernet network environment.

  • Page 10: Conventions

    BOUT UIDE Conventions The following 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.

  • Page 11: Introduction

    100 Mbps connectivity, has 12 dedicated RJ-45 twisted-pair ports on its front panel, as shown in Figure 1-1. A media-flexible transceiver interface module port on the hub’ s rear panel is designated the thirteenth port. NTRODUCTION ® ™ 100-TX Hub is a member of the 3Com ® SuperStack ™...
  • Page 12 (Refer to Chapter 3 for the interpretation of LEDs.) The hub’s rear panel (Figure 1-2) has a slot for a 3Com transceiver interface module, which (as the thirteenth port) provides media flexibility and accessibility to the hub.

  • Page 13: Management Unit

    The rear panel of the hub provides a three-pronged socket for attaching a 100–240 V AC power cord to the hub. Alternatively, power can be supplied through a 3Com Redundant Power System (RPS) connected to the DC input connector. Refer to the section “Using the Redundant Power System” in Chapter 2 for additional information.

  • Page 14: Hub Functions

    1: I HAPTER NTRODUCTION Hub Functions The LinkBuilder FMS 100-TX Hub supports the standard functions of an IEEE 802.3 repeater, as listed in Table 1-1. Table 1-1 Supported IEEE 802.3 Repeater Functions Standard Repeater Function Signal retiming Carrier integrity monitor Examines the packets being received for invalid framing; Jabber control Automatic partition/ reconnection...

  • Page 15: Installing The Fms 100-Tx Hub

    FMS 100-TX H This chapter discusses the following topics: Unpacking the hub Positioning the hub Installing the hub Installing the transceiver interface modules Using the Redundant Power System Replacing the fuse Unpacking the When unpacking the hub, follow these steps: 1 Open the shipping container and carefully remove its contents.

  • Page 16: Positioning The Hub

    This section discusses hub installation. You can install the hub in a standard 19-inch rack or on a desk or table. WARNING: 3Com strongly recommends that you install the hub stack in a rack, particularly if you intend to use more than four hubs in the stack. Since each hub weighs 12 pounds (5.5 kg), the total weight of eight hubs (the...

  • Page 17: Rack Mounting

    Rack Mounting The hub is supplied with two brackets and four screws for rack mounting in a standard 19-inch rack. The four rubber feet that are shipped with each hub are not used for rack mounting. To mount the hub in a rack, follow these steps, which assume you are stacking two or more hubs in a rack: 1 Place one of the hubs on a level surface, with the front panel facing you.
  • Page 18 2: I HAPTER NSTALLING THE 6 Attach brackets to both sides of the other hubs to be rack-mounted, as described in steps 2 through 4. 7 Insert each hub into the rack and fasten each one individually to the rack uprights, as shown in Figure 2-3.

  • Page 19: Desktop Placement

    Installing the The LinkBuilder FMS 100-TX Hub chassis is equipped with a rear panel port Transceiver into which you can insert an optional 3Com transceiver interface module. Interface Modules The transceiver interface module permits connections to a 100 Mbps Ethernet station or a network backbone that is also running 100 Mbps Ethernet.
  • Page 20 2: I HAPTER NSTALLING THE CAUTION: Each module is packed in antistatic material to protect it during shipment. To avoid damaging any static-sensitive components after removal 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. You can maintain grounding by wearing a wrist strap attached to the chassis.

  • Page 21: Using The Redundant Power System

    Using the To ensure fail-safe operation and constant power to the hub stack, you can Redundant use the 3Com Redundant Power System (RPS) (part number 3C565047). Power System The RPS must be purchased separately. The RPS, which is rack-mountable, comprises two load-sharing bulk power supplies fed by two independent AC lines.
  • Page 22 2: I HAPTER NSTALLING THE The RPS cables are inserted into the DC input connectors on the hubs’ rear panels. Remove the rubber protective cover from each DC input connector before connecting the RPS cable. Figure 2-6 shows the RPS mounted on top of a four-hub stack and connected to each hub.

  • Page 23: Replacing The Fuse

    Replacing the Fuse If the hub’s power (PWR) LED was lit initially but is no longer lit, one of the following conditions may have caused the LED to go out: The unit may be disconnected from its AC power source. If connected to an RPS, the unit may be disconnected from its DC power source.
  • Page 24 2-10 2: I HAPTER NSTALLING THE 4 Remove the burned-out fuse by pulling it straight out of its socket, as shown in Figure 2-8. Figure 2-8 Removing the Fuse If you wish, you can store a spare fuse in the front section of the fuse-holder.

  • Page 25: Making Fms 100-Tx Hub

    Connects as many as eight hubs to each other to form a single logical stack Connects hub or hub stack to a Management Unit Connects hub or hub stack to network backbone through a bridge, router, or switch...

  • Page 26: Hub To Node

    3: M FMS 100-TX H HAPTER AKING Hub to Node Once installed, the hub can support up to 12 end node connections. Figure 3-1 shows 11 PCs and one server connected to the RJ-45 ports on the hub’s front panel. You can connect any combination of PCs, servers, and other hubs to the 12 RJ-45 ports.
  • Page 27 Adapter Figure 3-2 Pin Assignments for 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. Figure 3-3 shows the RJ-45 connector pin assignments. 100BT 12345678 Figure 3-3 RJ-45 Connector Pin Assignments...

  • Page 28: Hub-To-Hub Interconnection

    3: M FMS 100-TX H HAPTER AKING Hub-to-Hub You can interconnect up to eight hubs, using expansion cables to form one Interconnection logical unit. (The hub expansion cable is also designated the inter-hub bus [IHB] cable.) Interconnecting eight hubs will provide a maximum of 104 ports (96 RJ-45 ports from the front panels and 8 ports from the transceiver interface modules inserted in the hubs’...

  • Page 29: Hub To

    DOWN expansion port on the Management Unit’s rear panel, as shown in Figure 3-5. 3Com strongly recommends that you place the Management Unit on top of the hub stack, so it will be unit number 1. This will ensure that existing nonvolatile port configuration information is applied to the correct physical...

  • Page 30: Hub To Backbone

    100-TX module and gain access to a 10BASE-T network. Likewise, by using the 100BASE-FX module, you can attach the hub to a switch that is connected via fiber cabling to the network. (See the next section for a discussion of using the hub to access multisegmented networks.)

  • Page 31: Considerations For Multisegmented Networks

    Considerations The 100BASE-T technology defined in the IEEE 802.3 standard provides for both homogeneous CSMA/CD 100 Mbps networks and heterogeneous 10/100 Mbps Multisegmented mixed networks. Both network topologies can be supported by connecting Networks various LAN segments using repeaters and switches, bridges, or routers. The LinkBuilder FMS 100-TX Hub supports only the 100 Mbps network topology.
  • Page 32 A Fast Ethernet packet transmitted on a LAN can pass through no more than two logical Class II repeaters or one logical Class I repeater before reaching its destination or passing through a LAN bridge, switch, or router. ONNECTIONS 100BT...

  • Page 33: Classification Of Repeaters

    Classification of The IEEE 802.3 standard defines two classes of repeaters for 100BASE-T Repeaters Fast Ethernet networks, as detailed below. Class I Repeaters A Class I repeater is a hub with internal delay such that only one repeater can exist between any two DTE (data terminal equipment) devices within a single collision domain when two maximum-length cable segments are used.

  • Page 34: Class Ii Repeaters

    3-10 3: M FMS 100-TX H HAPTER AKING Class II Repeaters A Class II repeater is a hub with internal delay such that no more than two hubs can exist between any two DTE devices within a single collision domain when two maximum-length cable segments are used.

  • Page 35: Led Descriptions

    LED Descriptions The LinkBuilder FMS 100-TX Hub is equipped with front panel LEDs to provide port status and hub information (see Figure 3-10). Figure 3-10 LED Indicators Status LEDs Table 3-2 interprets the meaning of the port STATUS LEDs. Table 3-2 Port LEDs ACTIVITY LINK PARTITION...

  • Page 36: Operation Leds

    3-12 3: M FMS 100-TX H HAPTER AKING Operation LEDs Table 3-3 interprets the meaning of the hub operation LEDs. Table 3-3 Hub Operation LEDs FAN FAIL OVERTEMP COLLISION CLS II (Class II) CLS I (Class I) PWR (Power) Unit Digital Display The front panel unit digital display (see Figure 3-11) provides a numeric designation for each component in a hub stack, including a Management Unit if one is present.

  • Page 37: Power-Up Disabled Option Switch

    Power-Up If network management is present, an external switch on the hub’s rear panel Disabled Option allows you to power-up the hub with the ports disabled. The power-up Switch disabled option switch is located between the expansion connectors and the DC input connector, as shown in Figure 3-12.

  • Page 39: Cabling

    ABLING The LinkBuilder FMS 100-TX Hub supports Fast Ethernet cabling and topology requirements, as detailed in the IEEE 802.3 specification. Fast Ethernet preserves the 100-meter maximum UTP cable length from the hub to the desktop that is a requirement for 10 Mbps Ethernet. Two 100 Mbps topology rules are different from those for 10 Mbps Ethernet: The maximum number of repeaters in a collision domain is two.

  • Page 40: Transceiver Interface Module Cabling Requirements

    HAPTER ABLING Transceiver The two transceiver interface modules provide downlink connectivity to Interface Module another hub or to a bridge, router, or switch. For transceiver interface Cabling module connections, the hub supports 100BASE-T functionality using the Requirements following media specifications: 100BASE-TX: two pairs of Category 5 twisted-pair UTP wire 100BASE-FX: two-strand fiber-optic cabling (62.5/125...

  • Page 41: One Class I Repeater

    fiber run to the collapsed backbone). For example, you could use a 160.8-meter fiber downlink from the hub to a router, bridge, or switch with a 100-meter maximum UTP run from the hub to the desktops. (See Figure 4-2.) Figure 4-2 Connecting the Hub in a Network Span of 260.8 Meters...
  • Page 42 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 workgroups. This would divide the network into a number of independent segments, as illustrated in Figure 4-3.

  • Page 43: Specifications

    This appendix lists the specifications for the LinkBuilder FMS 100-TX Hub. Hub Specifications Physical Dimensions Length: Width: Height: Weight: Environmental Operating Ranges Operating temperature: Storage temperature: Humidity: Altitude: Power Requirements AC input voltage: Inrush current: AC input isolation: Power consumption: Heat output: User-replaceable fuse: Repeater Classification...

  • Page 45: Technical Support

    3Com provides easy access to technical support information through a variety of services. This appendix describes these services. On-line Technical 3Com offers worldwide product support seven days a week, 24 hours a day, Services through the following on-line systems: 3Com Bulletin Board Service (3ComBBS) World Wide Web site 3ComForum on CompuServe®...

  • Page 46: Access By Isdn

    56 Kbps. To access 3ComBBS using ISDN, dial the following number: (408) 654 2703 World Wide Web Site Access the latest networking information on 3Com’s World Wide Web site by entering our URL into your Internet browser: http://www.3Com.com/ This service features news and information about 3Com products, customer service and support, 3Com’s latest news releases, selected articles from...

  • Page 47: Comfacts Automated Fax Service

    Support from If additional assistance is required, contact your network supplier. Many Your Network suppliers are authorized 3Com service partners who are qualified to provide Supplier a variety of services, including network planning, installation, hardware maintenance, application training, and support services.

  • Page 48: Support From 3Com

    3Com support contracts are available from 3Com. In the U.S. and Canada, call (800) 876-3266 for customer service. If you are outside the U.S. and Canada, contact your local 3Com sales office to find your authorized service provider: Country Australia (Sydney) (61) (2) 959 3020...

  • Page 49: Glossary

    LOSSARY 10BASE-T The IEEE 802.3 physical layer specification for a 10 Mbps Ethernet network over two pairs of Category 3, 4, or 5 UTP wire. 100BASE-FX The IEEE 802.3 physical layer specification for a 100 Mbps Ethernet network over two strands of fiber. 100BASE-T The group of IEEE 802.3 physical layer specifications for a 100 Mbps Ethernet network over various wiring specifications.
  • Page 50 Fiber-optic cable Cable consisting of a glass center, cladding, a buffer layer, strength members, and a cable sheath. The glass center supports the transmission of light signals. Flexible Media Stack. 3Com’s family of stackable hubs.
  • Page 51 LOSSARY A device used to provide connectivity between network devices. Hubs perform the basic repeater functions of restorating signal amplitude and timing, detecting collisions, and broadcasting signals to lower-level hubs and network devices. Media Access Control. The data link sublayer that is responsible for transferring data to and from the physical layer.
  • Page 52 LOSSARY SuperStack 3Com system of stackable hubs, servers, switches, routers, SDLC converters, and power supplies. SuperStack systems can support a range of LAN environments, including Ethernet, token ring, FDDI, SNA, and ATM. Thin Ethernet cable A cable standard for Ethernet (IEEE 802.3) networks using RG-58 A/U or RG-58 C/U cable and BNC connectors.
  • Page 53 3-6 100BASE-FX transceiver interface module 1-2 100BASE-T cabling 4-2 topology rules 4-2 100BASE-TX transceiver interface module 1-2 3Com Bulletin Board Service (3ComBBS) B-1 3Com sales offices B-4 3ComFacts B-3 3ComForum B-2 802.3 specifications 1-1 100 Mbps networks 3-7...
  • Page 54 3-6 hub-to-hub 3-4 hub-to-Management Unit 3-1, 3-5 hub-to-node 3-2 via a bridge, router, or switch 3-6, 3-7, 4-2, 4-3, 4-4 network management and power-up disabled option 3-13 network supplier support B-3 networks, heterogeneous 10/100 Mbps 3-7 on-line technical services B-1...
  • Page 55 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-TX Hub 1-3 technical support B-1 thirteenth port (transceiver interface module port) 1-1 topology rules, 100BASE-T 4-1, 4-2 transceiver interface module port 1-1 transceiver interface modules 1-1, 3-6...
  • Page 57 SOFTWARE: 3Com warrants that the software programs licensed from it will perform in substantial conformance to the program specifications therefor for a period of ninety (90) days from the date of purchase from 3Com or its Authorized Reseller. 3Com warrants the magnetic media containing software against failure during the warranty period.
  • Page 58 2. IEC 801-4—“Electromagnetic compatibility for industrial-process measurement and control equipment Part 4: Electrical fast transient/burst requirements.”—Severity level 2. A “Declaration of Conformity” in accordance with the above standards has been made and is on file at 3Com Corporation.
  • Page 59 NOTES...
  • Page 60 NOTES...
  • Page 61 NOTES...
  • Page 62 NOTES...
  • Page 63 Reader Comment Form Your comments concerning 3Com publications are important to us. Please take the time to complete this form. Your suggestions and comments will help us improve our future publications. Thank you. LinkBuilder FMS 100-TX Hub User Guide Publication Title ___________________________________________________________________________________ 09-0889-000 Part No.
  • Page 64 IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST CLASS PERMIT NO. 1883, SANTA CLARA, CA 3Com Corporation Attn: PCOps Technical Publications P.O. Box 58145 Santa Clara, CA 95052-8145 U.S.A. PLEASE FOLD AND TAPE. POSTAL REGULATIONS PROHIBIT THE USE OF STAPLES.

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