1. ________ is a line coding technique in which a logical “1” or “0” is represen

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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