Troubleshooting

Front 1

RF level into a cable modem/mta/day set top box

Back 1

-12 to +12 dBmv

Front 2

RF transmit level from a cable modem/mta/dsg set top box

Back 2

35 to 50 dBmv

Front 3

RF level into OOB set top box

Back 3

Analog: 0 to 15 dBmv; Digital: -8 to +10 dBmv

Front 4

RF transmit level from OOB set top box

Back 4

35 to 55 dBmv

Front 5

Roughly, as frequency quadruples on a center conductor, attentuation

Back 5

Doubles

Front 6

Low loss at low frequencies and high loss at high frequencies is called

Back 6

Tilt

Front 7

For every 1 degree F change, attenuation changes by appriximately

Back 7

1%

Front 8

Outside temperature fluctuations are the reasons our plant amplifiers have

Back 8

Automatic gain controls and automatic slope controls

Front 9

Approximately 60% of attenuation is attributable to

Back 9

The size of the center conductor

Front 10

4 basic steps to troubleshooting

Back 10

1. Analyze the problem 2. Isolate the problem 3. Fix the problem 4. Verify the fix

Front 11

Seven essential questions to ask a customer in order to analyze a problem

Back 11

1. What is the specific problem?

2. How long has it been occurring?

3. Did the problem occur suddenly or gradually?

4. How often does the problem occur?

5. What time of day does the problem occur?

6. Has the problem occurred before? If so, what caused the problem then?

7. What happened just before you noticed the problem?

Front 12

When isolating the problem, the four essential demarc points include

Back 12

CPE, splitter(s), bond location, tap

Front 13

FDM

Back 13

Frequency division multiplexing

Front 14

NTSC

Back 14

National Television Systems Committee

Front 15

Baseband vs carrier

Back 15

Baseband is the converted content itself, the carrier is the wave upon which it is modulated

Front 16

The carrier wave is generally at a much (blank) frequency than the input signal

Back 16

Higher

Front 17

Cliff edge for 64/256 QAM SNR

Back 17

23/28 dB

Front 18

General rule of thumb to guage good signal quality

Back 18

Add 3 dB to snr Cliff edge as insulation

Front 19

In QAM, describe the I signal and the Q signal

Back 19

I: incidence (x-axis); Q: quadrature (y-axis)

Front 20

Specifications call for what value MER for 64/256 QAM

Back 20

31/35 dB

Front 21

Spectrum support site for.customer reference

Back 21

Spectrum.net/support

Front 22

In an environment with no obstacles, 802.11ac wireless signals extend

Back 22

115 feet

Front 23

In an environment with no obstacles, 802.11n wireless signals extend

Back 23

230 feet

Front 24

Default gateway

Back 24

IP address of router in ipcong

Front 25

Typical default gateway

Back 25

192.168.0.1

Front 26

Public IP

Back 26

The IP address assigned to the modem

Front 27

DNS

Back 27

Domain Name Service

Front 28

Primary/secondary DNS Server

Back 28

The ip address of the IP/web address middleman service, checks web addresses against registry of all registered IP addresses... Internet providers have a default. 8.8.8.8 or 8.8.4.4 is Google's. 1.1.1.1 is another. Can make a difference in internet speeds

Front 29

Three helpful command prompt utilities

Back 29

Ipconfig

Ping (address)

Tracert (address)

Front 30

General IP address of local Host (yourself)

Back 30

127.0.0.1

Front 31

Default windows ip

Back 31

169.254.0.1; not a real IP address, only assigned if there is no internet connection

Front 32

Telephone service forward rf channel

Back 32

101

Front 33

Telephone service ideal/within spec levels

Back 33

0/+-10dBmV

Front 34

Type of Jack used for home security, describe

Back 34

RJ31X; 8-pin modular jack, usually located close to alarm control panel; a single pair of wires connects this to the NID

Front 35

LTE overlap band

Back 35

698-806 mHz

Front 36

Simple memory aid to remember standard 4-pair colors

Back 36

Blue skies, orange sun, green grass, brown dirt

Front 37

ATOM

Back 37

Automated Technical Operations Management

Front 38

eQA

Back 38

Electronic Quality Assurance

Front 39

CLI

Back 39

Cumulative Leakage Index

Front 40

I3000

Back 40

The most accurate approach to calculating CLI. Each leak is meaured from the source to a point 3000 meters above the center of the plant

Front 41

Aeronautical crossover frequencies

Back 41

108-137 mHz; 225-400 mHz

Front 42

Leakage threshold

Back 42

20 microvolts at 3 meters

Front 43

Hum modulation

Back 43

The amplitude distortion of broadband cable video and audio carriers by 60 or 120 Hz voltages

Front 44

Audio vs video hum

Back 44

Video: single (60 Hz) or double (120 Hz) horizontal bars that slowly roll up screen; Audio: low continuous audible drone that varies in frequency

Front 45

Specification for hum

Back 45

<=1%

Front 46

How many symbols per second are transmitted on a 256 QAM channel

Back 46

5M

Front 47

How many bits per symbol

Back 47

8

Front 48

How to calculate error incident?

Back 48

Bit rate*BER=Errors per second

Front 49

Pre-FEC vs Post-FEC BER

Back 49

pre:corrected+uncorrected; post: uncorrected

Front 50

DQI, ratings

Back 50

Digital Quality Index; 1-10, 8-10 is good, 6-7 indicate impairments, 3-4 indicate adverse impairment

Front 51

ICFR

Back 51

In-channel frequency response; magnitude of the largest peak to valley in the channel frequency response graph

Front 52

Group delay

Back 52

Measurement of how fast or slow a bandwidth of frequencies travels through a network

Front 53

HPMT

Back 53

High post main tap

Front 54

HPMTM

Back 54

High post main tap magnitude; a high value indicates the modem has a problem

Front 55

Ripples

Back 55

In-channel frequency response is measured for ripples, which are the peaks and valleys on the graph. Anywhere the line changes direction vertically by over 1dB, a ripple is tallied

Front 56

RJ 11/14/45

Back 56

1/2/4 pair connectors for CATx cable

Front 57

T568A/T568B

Back 57

Two types of Ethernet wiring/jack configuration patterns

Front 58

6 types of typical phone line problems

Back 58

Open (wire split); dirty open (wire stripped); crosstalk (wires touching across pairs); roll (tip/ring mismatch); short (exposed wires touching); split (connections made across pairs)

Front 59

Spectrum's OOB carrier frequency

Back 59

531 mHz