10Base-T (10 Mbps speeds) or 100Base-TX (100 Mbps (Web server info)
10Base-T (10 Mbps speeds) or 100Base-TX (100 Mbps speeds). These cables plug into the computer s NIC on one end and the hub on the other. For bus topologies, coaxial cables are used. These cables are also referred to as thin Ethernet cables, or thin net. (There are also thick net cables, which are more expensive and more cumbersome to deal with. These are rarely used and are primarily for network backbones.) The connector on coaxial cables is a barrel connector (BNC). A T connector attaches to the BNC port on the NIC. In the middle of the daisy chain, each computer connects to two adjacent computers using the T connector. At the two ends of the chain, the computer connects to one adjacent computer, then uses a terminator at the other end of the T to end the chain. Figure 15-3 shows an example of a twisted pair cable with an RJ-45 connector used for star topologies. Figure 15-4 shows a coaxial (thin net) cable with a BNC connector and a T connector used for bus topologies. A terminator at the end of the T connector shows that this is the end of a chain. If it were in the middle of the chain, the other side of the T would be connected to the next computer in the chain. Figure 15-3: A star topology’s twisted pair cables have RJ-45 connectors (similar to telephone cable connectors). Figure 15-4: A bus topology has coaxial cables that must be terminated (as shown) or continued from the T. Hubs With the star topology, a hub is required to connect the computers. For the bus topology a hub can be used, but is not necessary. Sometimes hubs are also referred to as repeaters or concentrators because they receive signals from the nodes connected to them and send the signals on to other nodes. Intel and 3Com make popular, inexpensive hubs for small offices.
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