Transmission media provide the physical path through which electrons flow. At the physical layer of OSI model of networking, electrons represent network data as binary 0s and 1s. Transmission media provides these electrons with a bound or unbound communication path. Telephone lines are well proven and commonly used communication media.
Telecommunications systems deliver messages using a number of different transmission media, including copper wires, fiber-optic cables, communication satellites, and microwave radio. One way to categorize telecommunications media is to consider whether or not the media uses wires. Wire-based (or wire line) telecommunications provide the initial link between most telephones and the telephone network and are a reliable means for transmitting messages. Telecommunications without wires, commonly referred to as wireless communications, use technologies such as cordless telephones, cellular radio telephones, pagers, and satellites. Wireless communications offer increased mobility and flexibility. In the future some experts believe that wireless devices will also offer high-speed Internet access.
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