Pathway through which individual systems are connected to route data signals in a network.
- Transmission media makes it possible to transmit electronic signals from one computer to another
- These signals are nothing but binary pulses.
- Each type of transmission media varies in its characteristics, that makes it suitable for a specific type of service.
Guided transmission media:
Consists of physical connection between source and destination via a wire or a cable. These connections are bounded to a channel to follow. There are three basic types of guided media :
- Twisted pair cable
- Co-axial cable
- Fiber-optic cable
Unguided transmission media:
No physical connection between source and destination, instead they use air itself. These connections are not bounded to a channel to follow. There are two basic types of primary technologies used.
- Travels in straight lines and therefore narrowly focused concentrating all the energy into a beam.
- Periodic repeaters are necessary for long distances.
- For transmitting and receiving, antennas should be aligned accurately.
- Can not penetrate through buildings.
- Best example is Bluetooth technology.
- Uses microwave radio to prevent from atmosphere and act as microwave relay station.
- They are situated in space 22,000 miles above the equator.
- It appears stationary from the earth as it rotates with specific speed.
- They can amplify and relay microwave signals from one transmitter on the ground to another.
- Capable of receiving, relaying of voice, data, and TV signals.
- Bad weather can affect the communication.
- Cost of media
- Installation requirements
- Band usage
- Electro Magnetic Interference (EMI)
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