1. ________ is a line coding technique in which a logical “1” or “0” is represen
ID: 2294130 • Letter: 1
Question
1. ________ is a line coding technique in which a logical “1” or “0” is represented by a voltage transition (e.g., low-to-high or high-to-low voltages) in the middle of the clock cycle.
a. NRZ
b. Manchester
c. Bipolar AMI
d. B8ZS
10 points
QUESTION 12
1. By using 4B/5B, you introduce 20% overhead.
True
False
10 points
QUESTION 13
1. Which timing and data synchronization method depends upon the data to recover timing.
a. Asynchronous
b. Synchronous
c. Isochronous
d. Plesiochronous
10 points
QUESTION 14
1. Select the correct statement(s) regarding “error correction”.
a. “error correction” techniques can be classified as either “error detection” or “error correction”
b. Forward error correction (FEC) depends upon the addition of redundant data bits to correct bit errors during transmission
c. Use of “parity bits” and Cyclic Redundancy Check (CRC) enables “error detection”, but not “error correction”
d. All statements are correct
10 points
QUESTION 15
1. Data compression algorithms are based on which concept(s)?
a. Removal of redundant data bits (e.g., “white space”)
b. Use of data formats/forms/templates so that only data, and not formatting information, is sent
c. In text documents, identifying and using common character strings and abbreviations
d. All are correct
10 points
QUESTION 16
1. Which multiplexing methods can be used with analog signals?
a. FDM
b. TDM
c. Both FDM and TDM
d. Neither FDM nor TDM
10 points
QUESTION 17
1. Communication systems are designed to address the noise floor; however, additional power “link margins” are built into most systems to enable communications when unpredictable or higher than normal noise is present within the operating environment.
True
False
10 points
a. NRZ
b. Manchester
c. Bipolar AMI
d. B8ZS
Explanation / Answer
Following are the correct answers;
1. A line coding technique in which a logical ‘1’ OR ‘0’ is represented by a voltage transition (e.g. low to high OR high to low voltages) in the middle of the clock cycle is;
Ans: Manchester
2. By using 4B / 5B you can introduce 20% overhead
Ans: True
3. Which timing and data synchronization method depends upon the data to recover timing.
Ans: Plesiochronous
4. Select the correct statement(s) regarding “error correction”.
Ans: The Correct options are;
b: Forward error correction (FEC) depends upon the addition of redundant data bits to correct bit errors during transmission
c. Use of “parity bits” and Cyclic Redundancy Check (CRC) enables “error detection”, but not “error correction”
Ans: All are correct
Ans: FDM
7. Communication systems are designed to address the noise floor; however, additional power “link margins” are built into most systems to enable communications when unpredictable or higher than normal noise is present within the operating environment.
Ans: True
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