# Transmission channel

Transmission channel

Short Answer 1. Given that a transmission channel has the following characteristics: The sender generates a signal at 55 dB of power. The signal attenuates at a rate of 5dB per kilometer. The channel has a noise level of 15dB at the sending end. The channel adds 5 dB of noise per kilometer. What is the maximum theoretical distance that a successful transmission can cover over this channel? You must show your work to earn full credit. 2. Where does electromagnetic noise come from? Explain why optical media such as fiber-optic and infrared is not affected by electromagnetic noise. 3. Describe how two separate channels may be carried over the same media. You must describe the method to earn full credit. (i.e., You will not get credit for just answering, “Multiplexing.”) 4. Given the following data block, parity bits (even parity), and block check character (even parity):

Data block Parity bit (even parity)

0 1 1 0 1 1 0 0 0 0 1 1 1 1 0 1 1 0 1 0 1 0 0 1 1 1 1 0 1 0 0 0 0 1 0 0 1 0 1 1 0 1 1 0 1 1 1 1 0 1 1 1 1 1 0 0 0 0 1 0 1 0 1 0 1 1 0 0 1 1 0 0

Block check character 1 0 0 0 0 1 1 1 0 (even parity)

Calculate the percentage of overhead bits that must be transmitted using this method

Identify the erroneous bit

Describe how to correct the error