Everything Signal (MM 10/23/2018)(IS2018)

Question 1

A term for an impairment that is caused by the RMS level of carrier to the thermal noise floor generated by the electronics

Answer 1

Carrier to Noise

Question 2

A term for an impairment that is caused by distortion components caused by non-linear mixing of carriers in the transmission system

Answer 2

Carrier to Coherent Interference

Question 3

A term for an impairment that is caused by HUM at low frequency—60Hz from the power system, 120Hz from linear power supplies, < 1 KHz from switching power supplies, and other low frequency sources.

Answer 3

Carrier to Low Frequency Distortion

Question 4

A term for an impairment that is caused by a continuous unwanted signal within the channel pass band that can affect digital decoding.

Answer 4

Carrier to Sustained Impairments (CI)

Question 5

A term for an impairment that is caused by digital effect due to power loading on amplifier circuits, generally present in processing equipment.

Answer 5

Spectral Regrowth

Question 6

A term for an impairment that in the analog world, results in “Ghosting” or “fringing,” also known as “ringing.” These are reflections that, if high enough in level in relation to the carrier, cause digital decoding problems.

Answer 6

Multipath and Micro-reflections

Question 7

A term for an impairment that is caused by the result of the presence of any of the distortion components listed above that cause an error in the digital decoding

Answer 7

Amplitude and Phase Distortion

Question 8

the nominal acceptable C/N for reliable operation for QPSK is

Answer 8

12dB

Question 9

the nominal acceptable C/N for reliable operation for 16QAM is

Answer 9

20dB

Question 10

the nominal acceptable C/N for reliable operation for 64QAM is

Answer 10

31dB

Question 11

the nominal acceptable C/N for reliable operation for 256QAM is

Answer 11

38dB

Question 12

acronym for MER

Answer 12

Modulation Error Ratio

Question 13

acronym for BER

Answer 13

Bit Error Rate

Question 14

is the measurement of the quality of the signal at the output of the edge device as compared to the quality of the signal after decoding at the CPE output

Answer 14

MER

Question 15

acronym for QAM

Answer 15

Quadrature Amplitude Modulation

Question 16

is a measurement of the average deviation of the desired signal vector point to the RMS of the actual landing point

Answer 16

MER

Question 17

is the average power difference of where the symbols landed versus the power at where they should have landed

Answer 17

MER