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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
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

2015 Mark (20 decks)

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