Vital purpose of this lecture is to presentation on Transmission Media for Trunks. Transmission media illustrates the nature of physical organism used to carry a communication signal from one system to another. Examples are includes twisted-pair cable, coaxial cable, and fiber optic cable etc. Transmission media is a pathway that transmits the information from sender to receiver. We use different types of cables or waves to transmit data. Data is transmitted usually during electrical or electromagnetic signals. Here briefly explain various types of Transmission Media: Open Wire Pairs, Twisted Pair Wires, Coaxial Cable, Microwave Links, Submarine Cables, Satellite Communications and Optical Fiber.