Chapter 7 Transmission Media 長庚大學資訊工程學系陳仁暉副教授 Tel: (03) 211-8800 Ext: 5990 Email: ******@ URL: .tw/~jhchen Figure Transmission medium and physical layer 2 NDSLab ******@2008 Transmission Media By definition Broadly defined as anything that can carry information from a source to a destination. ., air, twisted-pair cable, coaxial cable, fiber-optic cable, conductor, and so on. Guided media Provide a conduit from one device to another, include twisted-pair cable, coaxial cable, and fiber-optic cable. 3 NDSLab ******@2008 Figure Classes of transmission media 4 NDSLab ******@2008 7-1 GUIDED MEDIA Guided media, which are those that provide a conduit from one device to another, include twisted-pair cable, coaxial cable, and fiber-optic cable. Twisted-Pair Cable Coaxial Cable Fiber-Optic Cable Topics discussed in this section: 5 NDSLab ******@2008 Figure Twisted-pair cable 6 NDSLab ******@2008 Figure UTP and STP cables Unshielded Twisted-Pair (UTP) Shielded Twisted-Pair (STP) 7 NDSLab ******@2008 Unshielded vs Shielded Twisted-Pair Cable Unshielded twisted-pair (UTP) Shielded twisted-pair (STP) Has a metal foil or braided-mesh covering that encases each pair of insulated conductors. Category Electronic Industries Association (EIA) has developed standards to classify unshielded twisted-pair cable into seven categories. Table shows these categories. Connectors mon UTP connector is RJ-45 (RJ stands for registered jack). 8 NDSLab ******@2008 Table Categories of unshielded twisted-pair cables 9 NDSLab ******@2008 Figure UTP connector 10 NDSLab ******@2008
