Mary Lyon Snow
CS 3240: Data-Comm and Networks
(Fall 2015)

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    Homework 15
    Due: Fri Dec 11 2015

  1. 0 points: A digital device uses a (2-level) NRZ encoding and transmits with a bandwidth of 120 MHz. Assuming there is no overhead for synchronization, what is the achievable bit rate? Use .5 for an average value of c.

  2. 100 points: A digital device uses a (2-level) NRZ encoding and transmits with a signal rate of 70 Mbaud. Assuming there is no overhead for synchronization, what is the achievable bit rate? Use .5 for an average value of c.

  3. 0 points: A digital device uses a (3-level) RZ encoding and transmits with a bandwidth of 120 MHz. What is the achievable bit rate? (c is a constant 1 for RZ.)

  4. 100 points: A digital device uses a (3-level) RZ encoding and transmits with a signal rate of 70 Mbaud. What is the achievable bit rate? (c is a constant 1 for RZ.)

  5. 0 points: A digital device uses a (2-level) Manchester encoding and transmits with a bandwidth of 120 MHz. What is the achievable bit rate? Use .75 for an average value of c.

  6. 100 points: A digital device uses a (2-level) Manchester and transmits with a signal rate of 70 Mbaud. What is the achievable bit rate? Use .75 for an average value of c.

  7. 0 points: A digital signal is being encoded using 3-level Alternate Mark Inversion (AMI). If the first bit is encoded using a positive voltage, what is the encoding for the bit string 10110001? Use the symbols 0, +, and - to describe the encoding.

  8. 100 points: A digital signal is being encoded using 3-level AMI. If the first bit is encoded using a negative voltage, what is the encoding for the bit string 11010101? Use the symbols 0, +, and - to describe the encoding.

  9. 100 points: Why isn't there a multi-level scheme known as 4B1Q?

  10. 0 points: What is the rate ratio, r, for the multilevel scheme 6B4T?

  11. 100 points: What is the rate ratio, r, for the multilevel scheme 6B3Q?

  12. 0 points: How many extra signal patterns go unused in the multilevel scheme 6B4T?

  13. 100 points: How many extra signal patterns go unused in the multilevel scheme 6B3Q?

  14. Total Points: 700