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2015 Mark > scout > Flashcards

scout Flashcards

1
Q

A feature in Scout that can help identify drop and mainline problems.

A

Scout Flux

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2
Q

Provides a view into the upstream uncorrectable error rates for an entire upstream channel.

A

FEC Dashboard

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3
Q

Analyzes the forward error correction counters and signal-to -noise metrics for the upstream traffic on the entire channel.

A

FEC microscope

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4
Q

Brings up the last seven days of uncorrectable codeword rates grouped into one-hour polls.

A

FEC Uncorrectable History

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5
Q

Provides a view into which upstream channel(s) are being used by a particular node.

A

Upstream Channel Node Lookup

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6
Q

Where you can enter a customer device to be monitored for the online status every 10 minutes.

A

CM Watch

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7
Q

Where you can find information for a particular customer.

A

Customer Report

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8
Q

Where you can enter a node and the tool does a real-time check on all the modems in that node looking for service outages or potential degraded service issues.

A

Node Analyzer

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9
Q

Where you can create a custom report that displays real-time data for a particular device with attributes you select.

A

Real Time CM

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10
Q

Where you can see the results from the device query performed under the Real Time CM tab.

A

Batch Results

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11
Q

Provides customer billing information from CPE, the CM and MTA devices provisioned to the customer, the Video STB devices, and VOD streams and errors.

A

Customer Report

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12
Q

Engineer that led the effort to develop Scout FLUX?

A

Larry Wolcott

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13
Q

Feature of DOCSIS 2.0, or newer systems in which Digital Signal Processor (DSP) corrects signal echos and impairments.

A

Adaptive Equalization

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14
Q

3 types of Linear Distortions

A

Micro-reflectionsAmplitude tilt (ICFR)Group delay

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15
Q

Two types of upstream distortions

A

linear non-linear

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16
Q

Are caused by impedance mismatches and are indicated by a change in the amplitude and phase of a signal for a given frequency point.

A

Linear distortions

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17
Q

Bouncing back and forth of a signal between two interfaces that have an impedance mismatch.

A

Micro-reflection

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18
Q

A non-flat frequency response in which the amplitude versus frequency characteristic of the channel or operating spectrum is sloped or tilted across a specific frequency range.

A

Amplitude tilt

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19
Q

Observed when all portions of the channel do not arrive at the receiver at the same time.

A

Group delay

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20
Q

common examples of non-linear distortions:

A

Common Path Distortion (CPD)Composite Second Order (CSO)Composite Triple Beat (CTB)

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21
Q

A process in which a DSP actively corrects signal echoes and other linear distortions.

A

Upstream Pre-equalization

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22
Q

For most cases what is the distance between equalizer taps in the Impulse Coefficients Bar Chart?

A

85 feet

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23
Q

When not in signature mode what are the modem colors and what do they mean?

A

Green- OKYellow- Minor problemRed- Major problemGrey / Black- offline / Does not support adaptive equalization.Red / Yellow lightening Bolt- Distortion is still present after equalization.

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24
Q

What do the modem colors indicate in signature mode?

A

Groups of modems with common signatures

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25
Q

What two approaches does FLUX use to approximate the location of a problem?

A

Time domainFrequency domain

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26
Q

Which EQ tap is known as the main tap and signifies the cable modem time at zero?

A

EQ Tap 8

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27
Q

EQ taps to the right of tap 8 are used to?

A

Compensate for echoes

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28
Q

EQ taps to the left of tap 8 are used to?

A

Counter group delay and phase

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29
Q

The Coefficients bar chart is accurate to within?

A

20 feet

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30
Q

Name the four places that Scout Flux data can be accessed

A

Scout GrandSlam Market Health Watchtower

31
Q

Scout menu used for logging out or where administrators will go to access administrative features

A

Admin

32
Q

Scout menu used For accessing pages related to real-time device data

A

Device Watch

33
Q

Scout menu used For accessing the Comcast Digital Voice, or CDV, Call Summary and Upstream Interface Settings

A

CMTS Tools

34
Q

Scout menu used For accessing pages related to legacy digital set top box (or STB) video monitoring

A

Video Monitoring

35
Q

Scout menu used For finding rollup summary data for Upstream Forward Error Correction (or FEC) rates, video STBs, and Video On Demand, or VOD streams

A

Dashboards

36
Q

The path to view upstream uncorrectable error rates for an entire upstream channel in scout

A

Dashboards -> FEC Errors

37
Q

DSP

A

Digital Signal Processor

38
Q

Provides a view into which upstream channel(s) are being used by a particular node

A

Upstream Channel Node Lookup

39
Q

Where you can enter a customer device to be monitored for the online status every 10 minutes - this watch page does not generate any automated alerts though

A

CM Watch

40
Q

Where you can find information for a particular customer

A

Customer Report

41
Q

Where you can see statistics statistics for Xfinity WiFi

A

Beacon Report

42
Q

Where you can enter a node and the tool does a real-time check on all the modems in that node looking for service outages or potential degraded service issues.

A

Node Analyzer

43
Q

Where you can create a custom report that displays real-time data for a particular device with the attributes you select

A

Real Time CM

44
Q

Where you can see the results from the file upload from the device query performed under the Real Time CM tab

A

Batch Results

45
Q

Adaptive Equalization is a feature of this standard

A

DOCSIS 2.0 or greater.

46
Q

A type of distortion that is caused by impedance mismatches and are indicated by a change in the amplitude and phase of a signal for a given frequency point

A

Linear Distortions

47
Q

ISI

A

Intersymbol Interference

48
Q

This type of interference prevents the receiver from detecting the correct amplitude and phase of the received signal

A

Intersymbol Interference

49
Q

Three main categories of linear distortions

A

Micro-reflections Amplitude Tilt (ICFR) Group Delay

50
Q

The bouncing back and forth of a signal between two interfaces that have an impedance mismatch

A

Micro-Reflections

51
Q

Most common causes of micro-reflections

A

Unterminated ports Bad Connectors Bad Passives Damaged Cables

52
Q

A non-flat frequency response in which the amplitude versus frequency characteristic of the channel or operating spectrum is sloped or tilted across a specified frequency range.

A

Amplitude Tilt

53
Q

This is observed when all portions of the channel do not arrive at the receiver at the same time.

A

Group Delay

54
Q

Most common cause of Group Delay

A

The diplex filter or any kind of filtering mechanism(in home amplifiers can also be a factor)

55
Q

Common Examples of non-linear distortions

A

Common Path Distortions (CPD) Composite Second Order Distortion (CSO) Composite Triple Beat Distortion (CTB)

56
Q

When a DSP actively corrects signal echoes and other linear distortions.

A

Upstream Pre-Equalization

57
Q

The continuous, closed-loop feedback process between the modem and the CMTS

A

Adaptive Equalization

58
Q

The five graphs in Scout Flux

A

Impulse Coefficients Bar Chart In-Channel Frequency Response (ICFR) Graph Phase Response Graph Group Delay Graph Quadrature Amplitude Modulation (QAM) Constellation

59
Q

This chart graphs equalization coefficients in the time domain

A

Impulse Coefficients

60
Q

This can be thought of as time delays created by impairments between the CMTS and the device

A

EQ Coefficients

61
Q

One EQ Tap equals approximately how many feet?

A

85’

62
Q

This graph is an invers of the actual issue in the field

A

In Channel Frequency Response (ICFR) Graph

63
Q

On the ICFR Graph, if the equalized graph looks worse than the Pre-EQ graph the problem lies in one of these two places

A

At the CMTS or Additive Ingress

64
Q

Both of these graphs show the non-linear relationship between phase and frequency

A

Phase Response Graph and Group Delay Graph

65
Q

Each box represents a unique set of bits called symbols in this graph

A

QAM Constellation

66
Q

The edges of the boxes in the QAM Constellation are known as what?

A

The Decision Boundary

67
Q

if there is random scattering on the equalized side of the QAM Constellation, what might this indicate?

A

Presence of Ingress, a Non-Linear Distortion, or a Linear Distortion that is constantly changing

68
Q

Equalization is intended to correct what type of distortion?

A

Linear Distortions

69
Q

A red or yellow lightning bolt indicates what?

A

Distortion is still present after equalization

70
Q

In scout Flux these are the parameters that define the signature groups

A

Match Strength, Ripple dB, FFT (Fast Fourier Transform) Points and Defeat Taps

71
Q

The Taps to the Left of Tap 8 are used for what?

A

Compensate for Group Delay and Phase

72
Q

The Taps to the Right of Tap 8 are used for what?

A

Compensate for Echoes

73
Q

When using a meter to troubleshoot issues in FLUX, what type of channel should you be using on your test equipment?

A

A-TDMA

2015 Mark (20 decks)

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