® LINKBUILDER® FMS™ 100-TX HUB USER GUIDE A member of the 3Com LinkBuilder FMS family Part No.
3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 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.
CONTENTS ABOUT THIS GUIDE Introduction 1 How to Use This Guide Conventions 2 1 1 INTRODUCTION General Description 1-1 Management Unit 1-3 Hub Functions 1-4 2 INSTALLING THE FMS 100-TX HUB 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 Using the Redundant Power System 2-7 Replacing the Fuse 2-9 3 2-5 MAKING FMS 100-TX HUB CONNECTIONS Making Network Connections 3-1 Hub to Node 3-2 Hub-to-Hub Int
Using Transceiver Interface Modules 3-6 Considerations for Multisegmented Networks Classification of Repeaters 3-9 Class I Repeaters 3-9 Class II Repeaters 3-10 LED Descriptions 3-11 Status LEDs 3-11 Operation LEDs 3-12 Unit Digital Display 3-12 Power-Up Disabled Option Switch 3-13 4 3-7 CABLING Transceiver Interface Module Cabling Requirements Topology Rules 4-2 Hub to Connected Workstations 4-2 One Class I Repeater 4-3 A SPECIFICATIONS Hub Specifications B A-1 TECHNICAL SUPPORT On-line Technical S
INDEX LIMITED WARRANTY FCC CLASS A VERIFICATION STATEMENT CISPR A COMPLIANCE CE NOTICE v
vi
FIGURES 1-1 1-2 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 3-11 3-12 4-1 4-2 4-3 Front Panel of LinkBuilder FMS 100-TX Hub 1-2 Rear Panel of LinkBuilder FMS 100-TX Hub 1-2 Attaching a Bracket for Rack Mounting 2-3 Rack Mounting a Single Hub 2-3 Installing a Hub Stack in a Rack 2-4 Attaching a Bracket for Desktop Placement 2-5 Transceiver Interface Modules 2-6 Connecting the Redundant Power System to Four Hubs 2-8 Opening the Fuse-holder in the AC Receptacle Assembly 2-9 Remov
TABLES 1-1 2-1 3-1 3-2 3-3 3-4 4-1 viii Supported IEEE 802.
ABOUT THIS GUIDE Introduction This guide describes how to mount the 3Com® 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 Fast Ethernet network environment. How to Use This Guide The following table shows where to find specific information in this guide.
2 ABOUT THIS GUIDE 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. Warning Warnings alert you to the risk of severe personal injury.
1 INTRODUCTION The LinkBuilder® FMS™ 100-TX Hub is a member of the 3Com® SuperStack™ system of stackable network devices. The 100 designation refers to 100BASE-T Fast Ethernet, which is an extension of the Ethernet IEEE 802.3 specifications.
1-2 CHAPTER 1: INTRODUCTION 100BASE-TX 1x 2x 3x 4x 5x 6x STATUS 7x 8x 9x 10x 11x 12x UNIT 3C250-TX/Ι ACTIVITY FAN FAIL CLSII LINK OVERTEMP CLSI COLLISION PWR PARTITION ® LinkBuilder FMS 100 100BASE-TX Hub 1 2 3 4 5 6 7 8 9 10 11 12 13 Port LEDs RJ-45 ports Hub operation LEDs Unit digital display Figure 1-1 Front Panel of LinkBuilder FMS 100-TX Hub Each port (including the thirteenth port) is supplied with three LEDs that provide activity, link, and partition status informat
Management Unit 1-3 The two expansion connectors are used for adding components (additional hubs or a Management Unit) to create a hub stack. The LinkBuilder FMS 100-TX 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 functioning as a single logical repeater. Up to eight units (for example, seven hubs and a Management Unit) can be connected together in a stack.
1-4 CHAPTER 1: INTRODUCTION 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 Description Restores the timing and amplitude of the received signal before retransmitting the signal.
INSTALLING THE FMS 100-TX HUB 2 This chapter discusses the following topics: Unpacking the Hub ■ Unpacking the hub ■ Positioning the hub ■ Installing the hub ■ Installing the transceiver interface modules ■ Using the Redundant Power System ■ Replacing the fuse When unpacking the hub, follow these steps: 1 Open the shipping container and carefully remove its contents. 2 Return all packing materials to the shipping container and save it.
2-2 CHAPTER 2: INSTALLING THE FMS 100-TX HUB If you ordered one or more transceiver interface modules, they will be packaged separately from the hub. Positioning 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 Rack Mounting 2-3 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. 2 Position a bracket over the mounting holes on one side of the unit, as shown in Figure 2-1. .
2-4 CHAPTER 2: INSTALLING THE FMS 100-TX HUB 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.
Installing the Transceiver Interface Modules Desktop Placement 2-5 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. To prevent hubs from possibly sliding off the stack, fasten each hub to the hub below it by using the supplied brackets, as shown in Figure 2-4.
2-6 CHAPTER 2: INSTALLING THE FMS 100-TX HUB 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.
Using the Redundant Power System 2-7 3 Carefully remove the transceiver interface module from 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 following the tracks in the slot. The lettering that shows the module type must be positioned on top of the connector openings when the module is in place. 5 Push the module all the way in until the connector is firmly seated.
2-8 CHAPTER 2: INSTALLING THE FMS 100-TX HUB 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.
Replacing the Fuse Replacing the Fuse 2-9 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. Verify that the RPS is on and securely attached to the hub. ■ The AC power source may have failed. If you are using AC power, verify that the AC power cord is securely attached.
2-10 CHAPTER 2: INSTALLING THE FMS 100-TX HUB 4 Remove the burned-out fuse by pulling it straight out of its socket, as shown in Figure 2-8. se 0V fu ith 25 nly w Use o Figure 2-8 Removing the Fuse If you wish, you can store a spare fuse in the front section of the fuse-holder. 5 Insert a new fuse, rated at 2 A, 250 V, in the fuse-holder. 6 Push the fuse-holder back into the AC receptacle until it snaps in place, and reconnect the AC power cord.
MAKING FMS 100-TX HUB CONNECTIONS 3 This chapter discusses how to use the LinkBuilder FMS 100-TX Hub in various network environments. The chapter also discusses how to interpret the hub’s LEDs and how to use the power-up disabled option. Making Network Connections Table 3-1 summarizes the possible schemes for connecting the LinkBuilder FMS 100-TX Hub in a 100BASE-T network. These connections are the only ones permitted for a Class I device such as the LinkBuilder FMS 100-TX Hub.
3-2 CHAPTER 3: MAKING FMS 100-TX HUB CONNECTIONS 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. (The thirteenth port permits an additional connection through the transceiver interface module located on the hub’s rear panel.
Making Network Connections Adapter Hub 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 3-3 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.
3-4 CHAPTER 3: MAKING FMS 100-TX HUB CONNECTIONS Hub-to-Hub Interconnection You 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.) 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’ rear panels).
Making Network Connections Hub to Management Unit 3-5 You can connect the hub (or a hub stack) to a Management Unit by using the expansion cable. Connect the UP expansion port on the hub’s rear panel to the 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.
3-6 CHAPTER 3: MAKING FMS 100-TX HUB CONNECTIONS Hub to Backbone You 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 Considerations for Multisegmented Networks 3-7 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 mixed networks. Both network topologies can be supported by connecting various LAN segments using repeaters and switches, bridges, or routers. The LinkBuilder FMS 100-TX Hub supports only the 100 Mbps network topology.
3-8 CHAPTER 3: MAKING FMS 100-TX HUB CONNECTIONS Collision domain LinkBuilder FMS 100 100BT 1x 2x 3x 4x 5x 6x STATUS 7x 8x 9x 10x 11x 12x 3C250-TX UNIT ACTIVITY FAN FAIL LINK PARTITION ® 100BASE-TX Hub CLSII OVERTEMP CLSI COLLISION PWR 1 2 3 4 5 6 7 8 9 10 11 12 13 STATUS XXXXXX UNIT XX 3C16900 LinkBuilder FMS 100-TX Hub LinkSwitch 1000 LinkSwitch 1000 Switch Collision domain 3C16671 STATUS XX LinkBuilder FMS II LinkBuilder FMS II 10 Mbps Hub Figure 3-7 10 and 100 M
Classification of Repeaters Classification of Repeaters Class I Repeaters 3-9 The IEEE 802.3 standard defines two classes of repeaters for 100BASE-T Fast Ethernet networks, as detailed below. 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. The LinkBuilder FMS 100-TX Hub (product number 3C250-TX/1) is a Class I device only.
3-10 CHAPTER 3: MAKING FMS 100-TX HUB CONNECTIONS 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. The Class II network topology allows two hubs (or hub stacks) to exist between any two end stations. Figure 3-9 shows a two-repeater collision domain containing two hubs between two end stations that are located 205 meters apart.
LED Descriptions LED Descriptions 3-11 The LinkBuilder FMS 100-TX Hub is equipped with front panel LEDs to provide port status and hub information (see Figure 3-10). ® 3C250-TX/Ι UNIT STATUS ACTIVITY FAN FAIL LINK OVERTEMP CLSI PARTITION COLLISION PWR 12x CLSII 1 2 3 4 5 6 7 8 9 10 11 12 13 Figure 3-10 LED Indicators Status LEDs Table 3-2 interprets the meaning of the port STATUS LEDs. Table 3-2 Port LEDs LED Color Status Meaning ACTIVITY Green ON The port is receiving data.
3-12 CHAPTER 3: MAKING FMS 100-TX HUB CONNECTIONS Operation LEDs Table 3-3 interprets the meaning of the hub operation LEDs. Table 3-3 Hub Operation LEDs LED Color Status Meaning FAN FAIL Amber ON One or both of the two internal fans have failed. OVERTEMP Amber ON The internal temperature exceeds 158° F (70° C). COLLISION Green ON The segment is experiencing collisions. OFF The FMS 100-TX Hub does not support Class II configuration. This LED is nonfunctional.
Power-Up Disabled Option Switch Power-Up Disabled Option Switch 3-13 If network management is present, an external switch on the hub’s rear panel allows you to power-up the hub with the ports disabled. The power-up disabled option switch is located between the expansion connectors and the DC input connector, as shown in Figure 3-12. This feature cannot be fully implemented unless a network management device (such as the LinkBuilder FMS 100 Management Unit) is connected to the hub stack.
4 CABLING 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.
4-2 CHAPTER 4: CABLING Transceiver Interface Module Cabling Requirements Topology Rules Hub to Connected Workstations The two transceiver interface modules provide downlink connectivity to another hub or to a bridge, router, or switch. For transceiver interface module connections, the hub supports 100BASE-T functionality using the following media specifications: ■ 100BASE-TX: two pairs of Category 5 twisted-pair UTP wire ■ 100BASE-FX: two-strand fiber-optic cabling (62.
Topology Rules One Class I Repeater 4-3 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 to a router, bridge, or switch with a 100-meter maximum UTP run from the hub to the desktops. (See Figure 4-2.) ® Fiber backbone (160.
4-4 CHAPTER 4: CABLING 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.
A SPECIFICATIONS 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.) Weight: 5.
B TECHNICAL SUPPORT 3Com provides easy access to technical support information through a variety of services. This appendix describes these services.
B-2 APPENDIX B: TECHNICAL SUPPORT Access by ISDN ISDN users can dial-in to 3ComBBS using a digital modem for fast access up to 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.
Support from Your Network Supplier 3ComFacts Automated Fax Service B-3 3Com Corporation’s interactive fax service, 3ComFacts, provides data sheets, technical articles, diagrams, and troubleshooting instructions on 3Com products 24 hours a day, seven days a week. Call 3ComFacts using your touch-tone telephone. International access numbers are: Country Telephone Number Hong Kong (852) 2537 5610 U.K. (44) (1442) 278279 U.S.
B-4 APPENDIX B: TECHNICAL SUPPORT Support from 3Com If you are unable to receive support from your network supplier, technical 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.
GLOSSARY 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. 100BASE-T4 The IEEE 802.
2 GLOSSARY Class I A type of 100BASE-T repeater with internal delay such that only one repeater or stack may exist between 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 repeaters or stacks may exist between any two end stations within a single collision domain when two maximum-length copper cable segments are used.
GLOSSARY 3 Hub 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. MAC Media Access Control. The data link sublayer that is responsible for transferring data to and from the physical layer. MIB Management Information Base.
4 GLOSSARY 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. The coaxial cable is 0.2 inches in diameter, so it is more flexible than thick Ethernet cable.
INDEX 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 interface module 1-2 3Com Bulletin Board Service (3ComBBS) B-1 3Com sales offices B-4 3ComFacts B-3 3ComForum B-2 802.
2 INDEX H N 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 network connections hub-to-backbone 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 O I install
INDEX 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-TX Hub 1-3 T 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 100BASE-FX 1-2 100BASE-TX 1-2 cabling 2-5 cabling requirements 4-2 connector types 2
LIMITED WARRANTY HARDWARE: 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 Network adapters Ethernet stackable hubs and Unmanaged Ethernet fixed port repeaters Fast Ethernet stackable hubs *Power supply and fans in these stackable hubs and unmanaged repeaters Other hardware products Spare parts and spares kits One
FCC CLASS A VERIFICATION 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 against harmful interference in a commercial installation.
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