NCT 5 16

Question 1

the “measuring” of the analog signal at specific intervals

Answer 1

Sampling

Question 2

the assigning of a specific value to each of the samples

Answer 2

Quantization

Question 3

The process of varying the amplitude, frequency, or phase of a carrier to be in step with the instantaneous value of the modulating waveform.

Answer 3

modulation

Question 4

Data transmission scheme wherein the carrier is shifted in amplitude.

Answer 4

Amplitude Shift Keying (ASK)

Question 5

Digital modulation scheme wherein the frequency of the carrier is shifted

Answer 5

Frequency Shift Keying (FSK)

Question 6

Digital modulation scheme wherein the carrier is shifted in 90 degree steps. There are four possible phase states and the magnitude is constant.

Answer 6

quadrature phase shift keying (QPSK)

Question 7

A network architecture where nodes, hubs, or headends may be connected with fiber optic cables to provide redundancy or increase services.

Answer 7

ring

Question 8

An extra bit added to help check if the data that is being transferred is correct.

Answer 8

parity bit

Question 9

used in synchronous transmission to maintain synchronization between transmitter and receiver.

Answer 9

sync bits

Question 10

(DOCSIS)

Answer 10

Data Over Cable Service Interface Specification

Question 11

What does Nyquist’s Rule state?

Answer 11

The C/N gets worse by 3 dB each time the number of amplifiers doubles.

Question 12

How many phase angles are there in QAM?

Answer 12

4 (0°/360°, 90°, 180° and 270°)

Question 13

A stream of atomic nuclei that enter the earth’s atmosphere from outer space at speeds approaching that of light.

Answer 13

cosmic rays

Question 14

Having or relating to a frequency below the audibility range of the human ear.

Answer 14

infrasonic