1. In asynchronous serial communication the physical layer provides

Answer. both start & stop signalling and flow control

2. The physical layer is responsible for

Answer.
• line coding
• channel coding
• modulation

3. The physical layer translates logical communication requests from the into hardware specific operations.

Answer. data link layer

4. A single channel is shared by multiple signals by

Answer. multiplexing

5. Wireless transmission of signals can be done via

Answer.
• radio waves
• microwaves
• infrared