QUESTION: Identify the correct grouping of line coding techniques (i.e., mapping logical 1s and 0s directly to an electrical baseband signal).

a. ASK, FSK, PSK

b. ASK, QAM, NRZ

c. NRZ, Bipolar AMI, Manchester

d. AM, FM, PM

QUESTION: 4B5B differs from line coding techniques in that is ensures that strings of consecutive 1s and 0s do not exist prior to being line coded. Select the correct statement(s) regarding 4B5B.

a. since 4B5B eliminates long string of logical 1s and 0s, simpler line coding techniques such as NRZ can be used.

b. since one bit out of every five bits sent is not real information, the data link suffers from a 1/5 or 20% overhead cost (i.e., reduction in data throughput)

c. only 80% of the data sent using 4B5B is real information

d. all of the above are correct statements

QUESTION: Select the line coding technique in which the signal is sampled in the center of the clock pulse, and where a voltage transition essentially guarantees signal changes despite the transmission of long strings of logical 1s or 0s.

a. NRZ

b. Bipolar AMI

c. Manchester

d. B8ZS

QUESTION:Analog information can be converted into digital data using techniques such as PCM (pulse code modulation). Select the correct statement(s).

a. in order to convert an analog signal that consists of an infinite number of values, it must be sampled using the Nyquist sampling theorem

b. digitized analog signals always experience quantization loss

c. signal aliasing is experienced when sampling falls under the recommended Nyquist sampling rate

d. all of the above are correct

QUESTION: During the ADC process, failure to follow the Nyquist sampling theorem will result in a poor digital representation of the digitized analog signal. The result is signal aliasing.

True

False