|  | 7.1 |
| 10-Mbps and 100-Mbps Ethernet
|  | 7.1.4 |
| 10BASE-T
10BASE-T was introduced in 1990. 10BASE-T used cheaper and easier to install Category 3 unshielded twisted pair (UTP) copper cable rather than coax cable. The cable plugged into a central connection device that contained the shared bus. This device was a hub. It was at the center of a set of cables that radiated out to the PCs like the spokes on a wheel. This is referred to as a star topology. The distances the cables could extend from the hub and the way in which the UTP was installed increasingly used stars made up of stars, referred to as an extended star topology. Originally 10BASE-T was a half-duplex protocol, but full-duplex features were added later. The explosion in the popularity of Ethernet in the mid-to-late 1990s was when Ethernet came to dominate LAN technology. 10BASE-T also uses Manchester encoding. A 10BASE-T UTP cable has a solid conductor for each wire in the maximum 90 meter horizontal cable. UTP cable uses eight-pin RJ-45 connectors. Though Category 3 cable is adequate for use on 10BASE-T networks, it is strongly recommended that any new cable installations be made with Category 5e or better. All four pairs of wires should be used either with the T568-A or T568-B cable pinout arrangement. With this type of cable installation, supports the use of multiple protocols without rewiring. Figure shows the pinout arrangement for a 10BASE-T connection. The transmitting pair on the receiving side are connected to the receiving pair on the attached device. Half duplex or full duplex is a configuration choice. 10BASE-T carries 10 Mbps of traffic in half-duplex mode and 20 Mbps in full-duplex mode.
|  | Interactive Media Activity
Matching: 10BASE-T After completing this activity, the student will learn the characteristics of 10BASE-T technology. Interactive Media Activity 7.1.4 is located in the CCNA 3.0 Bridge 1 Activities and Quizzes file. The Activities and Quizzes file can be downloaded in the Course Material section of your class homepage.
Web Links
10BASE-T http://www.usyd.edu.au/is/comms/ networkcourse/USydNet_mod3_ ethernet.html#toc10baseTtoc10baseT