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

The voltage required to “ring” the phone, typically between

Answer 11

70 and 90 volts AC

Question 12

What does Nyquist’s Rule state?

Answer 12

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

Question 13

How many phase angles are there in QAM?

Answer 13

4 (0°/360°, 90°, 180° and 270°)

Question 14

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

Answer 14

cosmic rays

Question 15

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

Answer 15

infrasonic