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- Data can be transmitted in a single channel or multiple channels. - Bandwidth - The range of frequencies that can be transmitted. - Data Rate - The speed at which data is transmitted (bits per second) - **Factors that affect Data Rate:** - Bandwidth - Noise - Interference...

- Data can be transmitted in a single channel or multiple channels. - Bandwidth - The range of frequencies that can be transmitted. - Data Rate - The speed at which data is transmitted (bits per second) - **Factors that affect Data Rate:** - Bandwidth - Noise - Interference - Encoding scheme - **Encoding:** Conversion of data into a signal that can be transmitted over a transmission medium - **Types of Encoding:** - **Unipolar:** Only one voltage level is used to represent a binary digit. - **Bipolar:** Uses two voltage levels to represent a binary digit. - **Manchester:** uses transitions in the signal to represent a binary digit. - **Differential Manchester:** uses transitions in the signal to represent a binary digit.