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Flashcards in scout Deck (73):
1

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

Scout Flux

2

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

FEC Dashboard

3

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

FEC microscope

4

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

FEC Uncorrectable History

5

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

Upstream Channel Node Lookup

6

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

CM Watch

7

Where you can find information for a particular customer.

Customer Report

8

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.

Node Analyzer

9

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

Real Time CM

10

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

Batch Results

11

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

Customer Report

12

Engineer that led the effort to develop Scout FLUX?

Larry Wolcott

13

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

Adaptive Equalization

14

3 types of Linear Distortions

Micro-reflectionsAmplitude tilt (ICFR)Group delay

15

Two types of upstream distortions

linear non-linear

16

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

Linear distortions

17

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

Micro-reflection

18

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.

Amplitude tilt

19

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

Group delay

20

common examples of non-linear distortions:

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

21

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

Upstream Pre-equalization

22

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

85 feet

23

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

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

24

What do the modem colors indicate in signature mode?

Groups of modems with common signatures

25

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

Time domainFrequency domain

26

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

EQ Tap 8

27

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

Compensate for echoes

28

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

Counter group delay and phase

29

The Coefficients bar chart is accurate to within?

20 feet

30

Name the four places that Scout Flux data can be accessed

Scout GrandSlam Market Health Watchtower

31

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

Admin

32

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

Device Watch

33

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

CMTS Tools

34

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

Video Monitoring

35

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

Dashboards

36

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

Dashboards -> FEC Errors

37

DSP

Digital Signal Processor

38

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

Upstream Channel Node Lookup

39

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

CM Watch

40

Where you can find information for a particular customer

Customer Report

41

Where you can see statistics statistics for Xfinity WiFi

Beacon Report

42

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.

Node Analyzer

43

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

Real Time CM

44

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

Batch Results

45

Adaptive Equalization is a feature of this standard

DOCSIS 2.0 or greater.

46

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

Linear Distortions

47

ISI

Intersymbol Interference

48

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

Intersymbol Interference

49

Three main categories of linear distortions

Micro-reflections Amplitude Tilt (ICFR) Group Delay

50

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

Micro-Reflections

51

Most common causes of micro-reflections

Unterminated ports Bad Connectors Bad Passives Damaged Cables

52

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.

Amplitude Tilt

53

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

Group Delay

54

Most common cause of Group Delay

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

55

Common Examples of non-linear distortions

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

56

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

Upstream Pre-Equalization

57

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

Adaptive Equalization

58

The five graphs in Scout Flux

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

59

This chart graphs equalization coefficients in the time domain

Impulse Coefficients

60

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

EQ Coefficients

61

One EQ Tap equals approximately how many feet?

85'

62

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

In Channel Frequency Response (ICFR) Graph

63

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

At the CMTS or Additive Ingress

64

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

Phase Response Graph and Group Delay Graph

65

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

QAM Constellation

66

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

The Decision Boundary

67

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

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

68

Equalization is intended to correct what type of distortion?

Linear Distortions

69

A red or yellow lightning bolt indicates what?

Distortion is still present after equalization

70

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

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

71

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

Compensate for Group Delay and Phase

72

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

Compensate for Echoes

73

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

A-TDMA

Decks in 2016 Master Class (110):