1.       ________ is a line codingtechnique in which a logical “1” or “0” is represented by a voltagetransition (e.g., low-to-high or high-to-low voltages) in themiddle of the clock cycle.

		a. NRZ
		b. Manchester
		c. Bipolar AMI
		d. B8ZS

10 points   

QUESTION 12

1.       By using 4B/5B, youintroduce 20% overhead.

True

False

10 points   

QUESTION 13

1.       Which timing and datasynchronization method depends upon the data to recover timing.

		a. Asynchronous
		b. Synchronous
		c. Isochronous
		d. Plesiochronous

10 points   

QUESTION 14

1.       Select the correctstatement(s) regarding “error correction”.

		a. “error correction” techniques can be classified as either“error detection” or “error correction”
		b.  Forward error correction (FEC) dependsupon the addition of redundant data bits to correct bit errorsduring transmission
		c. Use of “parity bits” and Cyclic Redundancy Check(CRC) enables “error detection”, but not “errorcorrection”
		d. All statements are correct

10 points   

QUESTION 15

1.       Data compressionalgorithms 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, andnot formatting information, is sent
		c. In text documents, identifying and using common characterstrings and abbreviations
		d. All are correct

10 points   

QUESTION 16

1.       Which multiplexingmethods 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 aredesigned to address the noise floor; however, additional power“link margins” are built into most systems to enable communicationswhen unpredictable or higher than normal noise is present withinthe operating environment.

True

False

10 points