XM2 For NCT

Question 1

This is required to run the Upstream Alignment widget.

Answer 1

DOCSIS lock

Question 2

If the ICFR in the upstream is impaired at the node or becomes impaired on the way to the first amp, the technician should?

Answer 2

Stop aligning and remedy the Flux issue.

Question 3

Reason why Flux issues should be repaired before Upstream Alignment.

Answer 3

Flux issues can elevate transmit levels causing incorrect alignment at amplifiers.

Question 4

ICFR level required before balancing an amp for return tilt and transmit levels.

Answer 4

<2.0 dB per National Standard Application of Return Equalization

Question 5

Widget used to balance actives in the return path.

Answer 5

Upstream Alignment widget

Question 6

Widget used to balance and align actives.

Answer 6

Downstream Alignment widget

Question 7

In Ds Alignment,This is stored in a table to create an alignment reference.

Answer 7

Bin data

Question 8

In Ds Alignment, When are alignment references uploaded to the cloud?

Answer 8

Automatically

Question 9

In Ds Alignment, When are amplifier alignments uploaded to the cloud?

Answer 9

When the technician chooses to submit the final results.

Question 10

In Ds Alignment, These must be assigned along with their RF levels.

Answer 10

Low and High tilt channels.

Question 11

In Ds Alignment, these can be named and stored for future use.

Answer 11

Tilt profiles

Question 12

Where is Test Point Compensation set?

Answer 12

Via the main menu TP Comp settings screen.

Question 13

Test Point Compensation does not compensate for this.

Answer 13

DOCSIS return path levels.

Question 14

The first time Ds Alignment is run, the user will be prompted to enter these.

Answer 14

Low and High tilt channels

Question 15

In Ds Alignment, What inside the OFDM band can be used as the high tilt channel.

Answer 15

6 MHz chunks

Question 16

In Ds Alignment, once tilt levels have been entered, this will be displayed on the screen.

Answer 16

raw Ds frequency response

Question 17

In Ds Alignment, the “reference delta average” will appear as this color.

Answer 17

magenta

Question 18

In Ds Alignment, the tilt value colors as you work to bring the active output into balance.

Answer 18

Red > 1.5dB away from desired level
Yellow > 1dB away from desired level
White < 1dB away from desired level

Question 19

In Ds Alignment, the yellow line indicates this.

Answer 19

Saved target reference

Question 20

This widget is primarily used for Node Transmitter (LASER) Optimization.

Answer 20

Us Signal Generator widget

Question 21

Avoid injecting RF CW tones inside these as this will seriously degrade the return path.

Answer 21

active US channel spaces

Question 22

The upstream signal to noise ratio in an analog or digital HFC node will never be greater than this.

Answer 22

The USSNR of the optical link

Question 23

The XM2 generates a CW tone from this.

Answer 23

barrel #1

Question 24

The XM2 measures the generated tone locally on this.

Answer 24

barrel #2

Question 25

Us Signal Generation functions will cease when one of these two things happen.

Answer 25

User returns to XM App home screen

iOS device is locked either by timeout or by hand

Question 26

The node optimization tone should be placed here to manage tilt during the Us alignment process.

Answer 26

As close to the middle of the return band as possible

Question 27

In the Us Signal Generator widget, transmit adjustments can be made in these increments.

Answer 27

1.0dB

Question 28

In the Us Signal Generator widget, frequency adjustments can be made in these increments.

Answer 28

0.1 and 1.0MHz

Question 29

This widget is designed specifically for tracking noise at amplifier test points and plant passives.

Answer 29

Noise widget

Question 30

The Noise widget utilizes this connection.

Answer 30

barrel #2

Question 31

In the Noise widget, this is required on barrel 2 to remove forward RF from the tuner.

Answer 31

Low pass 5-42 or 5-85 filter

Question 32

In the Noise widget, forward RF will cause the tuner do this.

Answer 32

Saturate

Question 33

In the Noise widget, this reduces the dynamic range on the noise tuner and seriously degrades the XM2s ability to distinguish “real” noise and ingress on the plant from internal noise in the tuner.

Answer 33

Saturation

Question 34

This must be removed from barrel 2 when using the Us Signal Generator as it causes unwanted attenuation.

Answer 34

low pass filter

Question 35

In the Noise widget, these are the two different operating modes with different widget controls.

Answer 35

Spectrum & Heatmap

Question 36

In the Noise widget, Spectrum mode will show these three things.

Answer 36

Max hold, Live trace, and Min hold

Question 37

In the Noise widget, this mode works well in low-traffic areas and situations with constant signature noise.

Answer 37

Spectrum mode

Question 38

In the Noise widget Spectrum mode, this can be adjusted to change frames per second on screen.

Answer 38

Refresh Rate

Question 39

In the Noise widget Spectrum mode, this can be adjusted to manage sample rates in max hold code before processing.

Answer 39

Dwell Time

Question 40

In the Noise widget Spectrum mode, this will catch more fast burst impulse noise.

Answer 40

Long dwell

Question 41

In the Noise widget Spectrum mode, this will show consistent “signature noise”

Answer 41

Short dwell

Question 42

In the Noise widget, this mode shows a persistence based view where color indicates the half life of the signal being monitored.

Answer 42

Heatmap mode

Question 43

In the Noise widget Heatmap mode, this indicates frequent presence of signal.

Answer 43

dark colors

Question 44

In the Noise widget Heatmap mode, this indicates infrequent presence of signal.

Answer 44

light colors

Question 45

In the Noise widget Heatmap mode, this dictates the decay of persistence.

Answer 45

Half Life

Question 46

This is the ratio of the largest to the smallest signal that the tuner can measure.

Answer 46

dynamic range

Question 47

In the Noise widget, the XM application will automatically adjust this in the XM2 to attain best dynamic range.

Answer 47

Automatic Gain Control (AGC)