Chapter 8 Homework

# Chapter 8 Homework - CIS 3003 Homework 8 1 In conductors...

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CIS 3003 – Homework 8 1. In conductors, the flow of electrons within the material results in an electric current, with the magnitude of charge flow (size of electrical current) proportional to the value of the potential difference. 2. The relationship between voltage (V), current (I), and resistance (R) is defined by the following relationship: V = IR 3. In 4-ary signaling, four different signal levels are sent over the communication channel, and two bits may be sent over the channel using a single pulse of electricity. 4. The data rate (D) in bits per second for M-ary transmission can be calculated by the following: D = R log 2 M where R is the signaling transmission rate expressed in terms of signals per second. 5. The data rate for a communication system that employs 8-ary signaling and a signal transmission rate of 1000 signals per second is equal to 3kbps. 6. Wavelength of an electromagnetic wave can be calculated using the following expression: l=c/f where c is the speed of EM waves (“the speed of light”) in a vacuum measured in meters per second (m/s), and f is the frequency of the EM wave in hertz (Hz). 7. ASK, FSK and PSK are all digital modulation techniques. 8. When signals travel through any transmission medium, including fiber-optic cable, copper wire, or free space, they lose energy. The loss of energy, called attenuation , is a significant factor that affects the quality and distance of

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Chapter 8 Homework - CIS 3003 Homework 8 1 In conductors...

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