3Com 100 TX - Manual

viii T ABLES 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...

A BOUT T HIS G UIDE 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. Ho...

2 A BOUT T HIS G 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 ...

1 I NTRODUCTION 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. The 100BASE-T specification supports the following 10...

1-2 C HAPTER 1: I NTRODUCTION 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 information. Additional LEDs provide repeater classification, environmental, and port status info...

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 ben...

1-4 C HAPTER 1: I 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 Description Signal retiming Restores the timing and amplitude of ...

2-2 C HAPTER 2: I NSTALLING THE FMS 100-TX H UB 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 cab...

Installing the Hub 2-3 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 t...

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 Insert each hub into the rack and fasten each one individually to the rack uprights, as shown in Figure 2-3. Figure 2-3 Installing a Hub Stack in...

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 outli...

2-6 C HAPTER 2: I NSTALLING THE FMS 100-TX H UB 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 t...

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. T...

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 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 connecte...

Replacing the Fuse 2-9 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 D...

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 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. 5 Insert a new fuse, rated at 2 A, 250 V, in t...

3 M AKING FMS 100-TX H UB C ONNECTIONS 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 possibl...

3-2 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS 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 ...

Making Network Connections 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. Figure 3-...

3-4 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS 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 10...

Making Network Connections 3-5 Hub to Management Unit 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 strongl...

3-6 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS 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 inter...

Considerations for Multisegmented Networks 3-7 Considerations for Multisegmented Networks 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 conn...

3-8 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Figure 3-7 10 and 100 Mbps Collision Domains Connected by a Switching Hub 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 p...

Classification of Repeaters 3-9 Classification of Repeaters The IEEE 802.3 standard defines two classes of repeaters for 100BASE-T 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 (d...

3-10 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS 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 topol...

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 Figure 3-10). Figure 3-10 LED Indicators Status LEDs Table 3-2 interprets the meaning of the port STATUS LEDs. 12x UNIT ® STATUS 1 2 3 4 5 6 7 8 9 1...

3-12 C HAPTER 3: M AKING FMS 100-TX H UB C ONNECTIONS Operation LEDs Table 3-3 interprets the meaning of the hub operation LEDs. 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 i...

Power-Up Disabled Option Switch 3-13 Power-Up Disabled Option Switch 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 c...

4 C 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 topolog...

4-2 C HAPTER 4: C ABLING Transceiver Interface Module Cabling Requirements 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 ...

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...

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 workgroups. This would divide the network into a number of independent segments, as illustrated in Figure 4-3. Figure 4-3 ...

A S PECIFICATIONS 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: 5.5 kg (12 lb) Environmental Operating Ranges Operating temperature: 0˚ to 40˚ C...

B T ECHNICAL S UPPORT 3Com provides easy access to technical support information through a variety of services. This appendix describes these services. On-line Technical Services 3Com offers worldwide product support seven days a week, 24 hours a day, through the following on-line systems: ■ 3Com Bu...

B-2 A PPENDIX B: T ECHNICAL S UPPORT 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 sit...

Support from Your Network Supplier B-3 3ComFacts Automated Fax Service 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 ...

B-4 A PPENDIX B: T ECHNICAL S UPPORT 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. and Canada, contact your local 3C...

G 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 l...

2 G LOSSARY 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 tha...

G LOSSARY 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 sublaye...

4 G 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) networ...

I NDEX Numerics 100 Mbps media options 100BASE-FX 1-1 required cabling 3-6 100BASE-T4 1-1100BASE-TX 1-1 required cabling 3-6 100BASE-FX transceiver interface module 1-2100BASE-T cabling 4-2topology rules 4-2 100BASE-TX transceiver interface module 1-23Com Bulletin Board Service (3ComBBS) B-13Com sal...

I NDEX 3 S specifications environmental operating ranges A-1physical dimensions A-1power requirements A-1 stacking hubs 1-3straight-through cabling, pin assignments 3-3SuperStack family FMS 100 Management Unit 1-3FMS 100-TX Hub 1-3 T technical support B-1thirteenth port (transceiver interface module...

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