3Com 100 TX User Manual

4 CABLINGThe LinkBuilder FMS 100-TX Hub supports Fast Ethernet cabling and topologyrequirements, as detailed in the IEEE 802.3 specification. Fast Ethernetpreserves the 100-meter maximum UTP cable length from the hub to thedesktop that is a requirement for 10 Mbps Ethernet. Two 100 Mbps topologyrules are different from those for 10 Mbps Ethernet:n The maximum number of repeaters in a collision domain is two. (For additionalinformation, refer to the sections “Considerations for MultisegmentedNetworks” and “Classification of Repeaters” in Chapter 3.)The LinkBuilder FMS 100-TX Hub only supports one repeater in a collisiondomain.n In a single collision domain, the maximum network diameter is 200 meterswith Category 5 UTP cabling only, or 260.8 meters with one fiber-opticcabling link. Refer to Table 4-1 for a summary of maximum cable lengths.Table 4-1 Maximum Network Collision Domain DiametersModel Maximum Cable Length MediaHub to connectedworkstations100 meters Straight-through UTP cableOne Class I repeater 200 meters Straight-through UTP cable260.8 meters Combined UTP and fiber cable