Transmission Media
Two types of transmission media:
1) Physical transmission media/Guided media/Wired
- Twisted-Pair Cable,Coaxial Cable,Fiber-Optic Cable
2) Wireless transmission media/Unguided media/Wireless
- Infrared,Broadcast Radio,Cellular Radio,Microwave, communications satellite
Physical Transmission Media
| Device | Description of guided media(Physical Transmission Media) |
|---|---|
| Twisted Pair Cable | • Twisted-pair cable consists of one or more twisted-pair wires bundled together. |
| •Widely used transmission media for network cabling and telephone systems. | |
| Coaxial cable | Consists of a single copper wire surrounded by at least three layers: |
| 1.An insulating material | |
| 2.A woven or braided metal | |
| 3.A plastic outer coating . | |
| Fiber optic | A transmission media that uses glass or plastic fiber to carry light (laser) signals. |
Wireless Transmission Media
| Device | Discription of Wireless Transmission Media |
|---|---|
| Infrared | Infrared (IR) is a wireless transmission medium that sends signals using infrared light waves. |
| Broadcast radio (Bluetooth, Ultra Wideband (UWB), Wi-Fi and WiMAX | A wireless transmission medium that distributes radio signals through the air over long distances such as between cities, regions and countries and short distances such as within an office or home. |
| Cellular Radio (2G,3G,4G) | A form of broadcast radio that is used widely for mobile communications, specifically wireless modems and cell phones |
| Microwave | Microwaves are radio waves that provide a high-speed signal transmission. |
| * Microwave transmission, often called fixed wireless, involves sending signals from one microwave station to another. | |
| Communications Satellite | Is a space station that receives microwave signals from an earth-based station, amplifies (strengthens) the signals, and |
| broadcasts the signals back over a wide area to any number of earth-based stations. |
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