BDS RF Fundamentals and Signal Theory

Question 1

What is the standard downstream frequency range used in DOCSIS 3.1 systems?

Accepted Answer

108–1218 MHz

Answer

5–42 MHz

Answer

54–1002 MHz

Answer

1 GHz–3 GHz

Question 2

What unit measures the ratio of signal power to noise power in a cable system?

Accepted Answer

SNR (dB)

Answer

dBmV

Answer

dBc

Answer

BER

Question 3

Which modulation scheme carries the most bits per symbol in HFC downstream signals?

Accepted Answer

1024-QAM

Answer

64-QAM

Answer

256-QAM

Answer

QPSK

Question 4

What does a -6 dBmV reading indicate compared to 0 dBmV?

Accepted Answer

Signal is one-quarter the power

Answer

Signal is twice as strong

Answer

Signal is half the power

Answer

Signal is six times stronger

Question 5

What phenomenon causes signal levels to vary across the frequency spectrum due to different attenuation rates at different frequencies?

Accepted Answer

Tilt

Answer

Ingress

Answer

Reflection

Answer

Distortion

Question 6

What is the typical upstream frequency range in a DOCSIS 3.0 cable plant?

Accepted Answer

5–42 MHz

Answer

54–750 MHz

Answer

750–1000 MHz

Answer

1002–1218 MHz