ct3 Flashcards
1
Q
Aspect ratio of HDTV
A
16:9
2
Q
Preferred method of coax cable routing
A
Home Run
3
Q
What is CRT?
A
cathode ray tube
4
Q
What four services are business class TV customers not eligible to receive?
A
PPVVODDVRPremium channels
5
Q
What does REN stand for?
A
Ring equivalency number
6
Q
How much REN do we suppoprt?
A
5
7
Q
DOCSIS
A
Data Over Cable Services Interface Specification
8
Q
What ensures interoperability of cable modems from various manufacturers?
A
DOCSIS
9
Q
What does MoCA stand for?
A
Multimedia over Coax Alliance
10
Q
Name four COMCAST business services
A
TVPhoneInternetTeleworker
11
Q
What is the delay between transmission and arrival of a packet?
A
latency
12
Q
What is it called when packets are received in the wrong order?
A
jitter
13
Q
What does the term POTS mean?
A
Plain Old Telephone System
14
Q
What is the name of the dial tone a customer will hear when they have voicemail?
A
stutter
15
Q
what does CMTS stand for?
A
Cable Modem Termination System
16
Q
How many pairs should there be in a fax machine flat satin?
A
1 pair
17
Q
What does EDTV stand for?
A
Enhanced Definition TV
18
Q
What is the resolution of EDTV?
A
480p
19
Q
What does eMTA stand for?
A
embedded mutimedia terminal adapter
20
Q
All lights flashing on an eMTA indicate what type of problem?
A
Foreign Voltage
21
Q
What does VOIP stand for?
A
Voice Over Internet Protocol
22
Q
List the 3 pairs in order of older station wire?
A
Green/Red Black/Yellow White/Blue
23
Q
What tools can you use to check polarity on a phone line?
A
Butt Set and Toner
24
Q
Internet phone services transmit calls over a ______ network.
A
Public
25
What is the supervisory voltage provided by an eMTA?
42-48 VDC (tip side 0V ring side -48)
26
What connection type provides both audio and video?
HDMI
27
Out of the following colors: Green/Red Yellow/Black list the tip and ring.
green-tipred-ringyellow-ringblack-tip
28
What is DHCP?
Dynamic Host Configuration Protocol
29
What is QAM?
Quadrature Amplitude Modulation
30
What frequencies are assigned to the downstream and upstream?
Up- 5-42 MhzDown- 54-1000 Mhz
31
List 2 types of call forwarding.
SelectiveVariable
32
What is the 4 step troubleshooting process?
IdentifyIsolateRepairVerify
33
What are 3 ways to access voicemail?
*99Xfinity ConnectVM Access
34
What is ICFR?
In Channel Frequency Response
35
Ring voltage for CDV?
60-90 VAC (20-23Hz)
36
5 factors of attenuation
Diameter of center conductorDielectricFrequencyTemperatureLength of cable
37
What is the difference between dB and dBmV?
dB is relativedBmV is absolute
38
Multiple carriers oscillating at different frequencies transported in the same medium is what?
Frequency Division Multiplexing
39
Passage of outside signal into the cable is known as what?
Ingress
40
Signal leaking out of the system is known as what?
Egress
41
What are the three main components of a home theater system?
AudioVideoEnvironment
42
List the 4 main types of displays
Direct viewRear ProjectionFront projectionFlat Panel
43
Latent or out of sync audio is known as?
Lip sync
44
MPEG identifies and removes what type of information between successive frames of the picture?
Redundant / Static
45
Separating successive frames into two types of video information is also known as what?
compression
46
What is a rugged, inexpensive to repair bandwidth versatile transmission medium?
Coaxial cable
47
A home run system is also known as what?
Star topology
48
Formula for voltage
E=IxR
49
What does DLNA stand for?
Digital Living Network Alliance
50
What are the 3 troubleshooting areas in CDV?
Before eMTAAt eMTAAfter eMTA
51
What numbers do you need to dial in order to place an international call?
011 + country code
52
DHCP
Dynamic Host Configuration Protocol
53
What is the measure of voice, data and or video quality provided to a customer called?
Quality of Service (QoS)
54
What is our loop current?
23-40 mA (current is drawn when you go off-hook)
55
List 2 safety precautions to take before working on phone lines.
Disconnect ILECDisconnect eMTA
56
When an eMTA is upgrading firmware what lights are flashing?
U/S and D/S
57
If the power light is flashing on an eMTA it indicates what?
AC power failure
58
What tool can you use to connect your butt set to a modular outlet?
banjo
59
The twists in CAT5 wire help to prevent these 2 things?
crosstalknoise
60
What type of cable is needed to backfeed an eMTA to a wallplate?
electrically straight
61
Excess debris left in a punch down block that can cause a short is known as?
shiners
62
ILEC
Incumbent Local Exchange Carrier
63
What defines where COMCAST may physically disconnect a customer from the ILEC network?
Interconnection Agreement
64
When troubleshooting a data device what is the first thing you should check?
dial tone and polarity
65
What must be placed between the eMTA and the customers telephones if they have an alarm system?
RJ31X
66
Businesses can add what services a la carte?
HDMusic ChoiceMulti LatinoSports Packages
67
What is an internet product for companies that have a mobile workforce?
Teleworker
68
How many email addresses are available to a teleworker customer?
7
69
How would a teleworker customer add or disconnect accounts?
Teleworker order center
70
What DOCSIS standard brought about channel bonding and IPv6?
DOCSIS 3.0
71
What is DNS and what does it do?
Domain Name SystemTranslates the FQDN to an IP
72
Connect RF to power in order to prevent what?
Ranging
73
The cumulative effect of ingress from multiple homes is known as what?
Funnel effect
74
The number one cause of ingress and egress occurs where in the system?
Drop system
75
The number 1 cause of ingress and egress?
Poorly installed connectors
76
CPE
Customer Premise Equipment
77
A return path problem that is caused by the corrosion of dissimilar metals?
CPD
78
What audio format has 4 channels: Left, Right, Center, Surrounds
Dolby Pro Logic
79
3 types of audio formats with 5.1 channels.
DTS Neo:6Dolby DigitalDTS
80
What essential supplies are needed for an Xfinity Internet installation?
Modem, cable installation materials (coaxial cable and splitters), welcome kits, ethernet cables
81
What are the installation options for Xfinity Internet?
Self installation and professional installation
82
What essential supplies are needed for an Xfinity Internet installation?
Modem, cable installation materials (coaxial cable and splitters), welcome kits, ethernet cables
83
What is a bit?
a single character of data
84
What is a Byte (B)?
8 bits, a larger amount of data but still not very large.
85
What is a Kilobit (Kb)?
Roughly 1000 bits. Many Internet applications measure speed in kilobits
86
What is a Gigabyte (GB)?
Roughly one thousand megabytes. Gigabytes are common when talking about hard drive storage.
87
What is a Megabit (Mb)?
Roughly one million bits. This is smaller than a megabyte, but is a common measurement for network bandwidth.
88
Projects light from microscopic mirrors onto big, widescreen, rear-projection TVs (or micro-displays)
Digital Light Processing(DLP)
89
What is the Pre-installation internet requirement to installing a CT3 cablecard in a PC?
An Internet connection MUST BE working prior to installation.
90
Boosts low level signals from the components to the speakers.
Amplifier
91
Images result when electrically charged gases illuminate colored phosphors
Plasma
92
What type of cable fulfills the video requirement for an internal or external xfinity TV user?
A/B USB cable.
93
What is a Gigabyte (GB)?
Roughly one thousand megabytes. Gigabytes are common when talking about hard drive storage.
94
Includes audio and video input/output ports; Audio input to AV receivers internal preamplifier; Audio output fed to system speakers; Video for selected device is fed from the receivers output jacks to connected video display
Audio/Video Receiver
95
What is the requirement PRIOR to installing a CT3 cablecard in a PC?
An Internet connection MUST BE working prior to installation.
96
Toslink or EIA-J are types of what?
Optical Digital Audio connectors
97
Uses an RCA connector to carry Digital Audio
Coaxial Digital connection
98
Uses an RCA connector to Analog Audio
Stereo Connection
99
Creates a picture by shooting an electronic beam at a phosphor-coated glass screen
Cathode Ray Tube (CRT)
100
Creates images by passing light through a layer of liquid crystal sandwiched between two panes of polarized glass.
Liquid Crystal Display(LCD)
101
Allows customers to link home TVs from any PC or hand-held device
Slingbox
102
Uses LED backlighting instead of the cold cathode fluorescents CCFL
LED-backlit LCD
103
A general term for non-projection types of TVs, which include conventional tube TVs and flat-panel plasma and LCD TVs
Direct View TV
104
Changes the size of an image to fit the pixel size of a device without changing the shape
Scaler
105
Operates with beam of infrared light; components must be in line of sight with remote
Infrared Remote
106
Consisting of a separate projector (typically placed on a table or ceiling-mounted) and screen; Can display images up to 20 feet across, or larger
Front Projection
107
Ideal if there is little or no space for a TV or projector; Can be hung on the wall; Can be plasma or LCD
Flat Panel
108
What is the pre-installation video requirement for a CT3 cablecard?
A) An internal or external xfinity TV Tuner
109
Just launched by Comcast, these remotes talk to the STB via RF while using infrared to talk to the TV.
IR/RF Remote(XR2)
110
Large 24-pin connector in which audio is not provided
DVI
111
4-pin video only connector
S-Video
112
RCA wiring that uses Yellow Red and White connectors
Composite video
113
Improves picture quality; Makes routing and distribution easier; Allows images to be displayed in different ways
Signal Processor
114
Enables multiple video and audio signals to be selected and sent to one or more display devices
Switcher
115
What type of cable fulfills the video requirement for an internal or external xfinity TV user?
An A/B USB cable.
116
Operate components located throughout the household; Generates signals of given radio frequency
RF Remotes
117
Control all components; Can be programmed for individual components (uses 3 or 4 digit codes)
Universal Remotes
118
Perform operations on more than one component; can usually learn commands
Programmable Remotes
119
Control all components; Can be programmed for individual components (uses 3 or 4 digit codes)
Universal Remotes
120
Perform operations on more than one component; can usually learn commands
Programmable Remotes
121
Just launched by Comcast,these remotes talk to the STB via RF while using infrared to talk to the TV.
IR/RF Remote(XR2)
122
How far should seating be away from TV for Optimum viewing in a Home Theater setup?
Seating should be two times the diagonal wide-screen TV away from TV (example: seating should be 84" away from a 42" TV screen)
123
Name 4 of the 6 equipment requirements for an external digital cable tuner setup.
1) Windows Vista Home Premium or Ultimate Edition2) Vista digital cable compatible PC3) DVD-ROM Drive4) Audio Output Capabilities5) Internet Access6) Internal or External Xfinity TV Tuner with remote
124
What is the second step in the installation checklist?
Ensure eMTA is on customer’s account If you are not using a handheld or laptop, call dispatch to verify.
125
What is the third step in the installation checklist?
Greet the customer Introduce yourself and explain that service will be temporarily disconnected. Ensure that the customer is NOT using an existing service (for example, downloading a file, recording a TV program, etc.) prior to starting to work.
126
What is the fourth step in the installation checklist?
Determine if additional jacks or wiring is needed If additional telephone jacks need to be installed, have the customer indicate where he/she wants them installed, and get sign-off of any extra costs. If additional wiring is needed, consult customer on preferences, and follow local guidelines regarding wiring policies.
127
What is the fifth step in the installation checklist?
Confirm work order Note changes and obtain agreement before work
128
What is the sixth step in the installation checklist?
Determine if customer has an alarm system If yes, have customer put in ―test‖ or call the alarm company to test alarm.
129
What is the seventh step of the installation checklist?
If yes, see page 36 for Door Entry System Considerations.
130
What is the eighth step in the installation checklist?
Give customer Welcome Kit Customer can look over while you do work.
131
What is the ninth step in the installation checklist?
Test and verify customer equipment Make a call from all the outlets the customer wants changed over to verify they are functioning properly
132
Equation for calculating Exact Loss
Cable Loss + Passive Loss = Total Loss
133
Most trouble calls, including repeat trouble calls, in the CATV industry are found where?
Between the tap port and the customer's television set.
134
The majority of troubles calls are due to what?
Poor connector installation or device attachments.
135
What types of problems can poorly installed F-Connectors cause the customer?
Tiling"One Moment Please" messageGhostingDistorted picture (hum)Intermittent service
136
The Top 5 Types of Connector Problems
1. Moisture damage2. Long/short center conductor3. Connector not tightened to port4. Braid removed or too short/long5. Improper connector for cable type
137
Why is it improper to cut a center conductor a second time to (trim it) to fit a fitting?
A jagged center conductor can scratch the contacts inside the F-port creating reflections.
138
Name 3 of the 6 best practices for F- Connector Installation
1. Use a prep tool with a stop2. Use the side of the compression tool to recheck dimensions3. With the correct prep tool, all the dimensions (1/4") are setup correctly.4. Make sure the dielectric is flush with post face5. Make sure you hear an audible "click" when using the torque wrench to ensure the connector is tightened properly.6. Always compress fully
139
Name 5 of the 10 Best practices for Handling Coaxial Cable
1. Do not use the wrong size clip2. Do not kink the cable3. Follow the cable's bending radius4. Label each end of cable with a matching numbering system5. Do not allow a vehicle to run over the cable6. Always use a cable caddy when handling drop cable7. When pulling drop cable off a reel, do not pull loops out. Walk to the loop and unwnd it without kinking the cable.8. Never make 90-degree bends.9.Do not staple the cable10. Do not over tighten tie wraps, or stuff into house boxes.
140
What is the tenth step in the installation checklist?
Test and verify Comcast services Verify the Cable TV picture quality on all of the customer’s televisions. Be sure the cable modem has Block Sync and basic Web sites can be accessed prior to starting the installation.
141
What is the eleventh step in the installation checklist?
Determine location of eMTA Place near customer’s primary computer, if possible Keep eMTA away from wireless devices, access by children/pets Avoid attics and spaces that are not temperature controlled
142
What is the twelve step in the installation checklist?
Complete Onsite Quality Assurance Check Check for signal leakage. Check for inferior/substandard cable, connectors, andcraftsmanship. Check for any filters/traps that may have existed within aprevious installation and remove. If Xfinity Internet does exist, check that the modem isconnected to a ―home run‖ coaxial outlet. If Xfinity Internet does not exist, determine the route for a coaxial cable from a splitter near the ground block to the customer’s PC location. Test to verify that the coaxial portion of the home wiring is properly bonded. Determine the route for a ―home run‖ phone line from the customer’s PC location to the NID. For customers with alarms systems, a ―home run’ phone line to the NID is a required practice to ensure the alarm equipment can seize the customer’s phone line to call out during a potential emergency scenario.
143
Series-6 cable bending radius:
2.5"
144
Series-7 cable bending radius:
4"
145
What are the two ways to typically connect the eMTA to the customer's inside wiring?
1. Direct line from NID to eMTA using Scotchlok connectors2. Via a four-pair jumper
146
What is involved in the "Isolate" step of the troubleshooting process?
1. Measure and record signal levels at outlets, splitter, ground block and tap2. Inspect all connectors, cable, and splitters and replace as needed3. Ensure all equipment is connected properly..4. Use Bypass Method to isolate bad equipment5. Perform Ingress Scan at both the ground block and the tap with all CPE connected.6. Use your Divide and Conquer techniques to cut the system in half to locate the fault
147
What frequency range is tested in a downstream Ingress resistance test?
88-108 MHz(FM Band) downstream
148
What is the web address for most Comcast modems and eMTAs
http://192.168.100.1
149
What frequency range is tested in an upstream spectrum test?
5-42 MHz
150
What is the acceptable measurement for both the upstream spectrum test and the Ingress resistance test?
-30 dBmV or lower
151
what are four benefits to an employer who uses teleworker?
Single contract, unified billing, online ordering and management, business class customer support
152
what are four benefits of teleworker for employees?
Multiple connections, comcast.net email, after hours use, Portal services
153
how any levels of teleworkers are there?
2
154
what are the names of of the two levels of teleworker?
Standard and enhanced
155
what is the major difference between the two teleworker service levels?
speed
156
how does a technician know the a teleworker customer from a CHSI customer?
the work order
157
what paper work does a technician give a teleworker at the end of the install?
None
158
RF:
RF or Radio Frequency refers to an electromagnetic wave that generally falls in the frequency range of 3 kHz to 300 GHz.
159
MHz (Megahertz):
Equal to one million Hz. Video signal bandwidth is typically expressed in megahertz
160
All FM radio stations transmit in a band of frequencies between:
88 and 108 MHz
161
Spectrum:
A range of wavelengths of electromagnetic emission
162
AM radio:
535 kHz to 1.7 MHz
163
Short wave radio:
5.9 to 26.1 MHz
164
Aircraft navigation frequencies:
110 to 137 MHz
165
Broadcast television stations: VHF low band channels 2 through 6
54 to 88 MHz
166
Broadcast television stations: VHF high band channels 7 through 13
174 to 220 MHz
167
The difference between transmitted and received power resulting from the loss through equipment, lines, or other transmission devices; usually expressed in decibels.
Attenuation
168
Coax attenuation specifications are based on:
100 feet of cable at 68 deg F
169
Each 10 degree increase in temperature results in a
1.2% increase in attenuation
170
The variable in calculating attenuation is always
The frequency
171
At 50 MHz, 100 feet of RG6 cable loses roughly
1.5 dBmV
172
At 400 MHz, 100 feet of RG6 cable loses roughly
4 dB
173
At 750 MHz, 100 feet of RG6 cable loses roughly
5.5 dB
174
The insulating material separating two conductors such as that between the center conductor and sheath in a coaxial cable
Dielectric
175
High frequencies travel in the very ____ of the center conductor
skin
176
Damage to the copper or silver skin of the center conductor will directly affect ____ _________ signals
high frequency
177
_____ ___________ utilize more of the cross-sectional area of the conductor and are more forgiving when it comes to imperfections in the copper plating
Lower frequencies
178
The property of higher frequencies travelling on the outer portion of a conductor is called the ____ ______
skin effect
179
A passive signal splitting device, with minimum signal loss between the input port and the output port (through loss), a specified coupling loss between the input port and the tap port (tap or coupler loss), and very high loss between the output port and tap port (isolation)
Directional coupler
180
A subunit of a larger unit called the bel:
decibel
181
Is a measure of the ability of a circuit (often an amplifier) to increase the power or amplitude of a signal from the input to the output
Gain
182
An increase of 3 dB _______ the signal power
doubles
183
Anytime an RF signal changes by 3 dB, the signal power is either _______ (+3 dB) or ___ __ ____ (-3 dB)
doubledcut in half
184
A signal of 0 dBmV corresponds to
1 mV across a 75-ohm impedance
185
(Attenuation x Footage)
Cable Loss
186
(Cable Loss + Passive Loss)
Total Loss
187
(Known Level – Total Loss)
Expected Level
188
A measure of the received carrier strength relative to the strength of the received noise
Carrier to Noise (C/N) ratio
189
A network architecture developed by the cable industry, which typically uses fiber optic cables to bring signals to selected areas of the system called nodes, which are usually based on the number of subscribers to be served
Hybrid Fiber Coax (HFC)
190
An advantage of fiber is:
It has bandwidth many times greater than coaxial cable and can travel great distances without amplification
191
The width of a band of frequencies
Bandwidth
192
Passage of an outside signal into the cable; can result in noise and disruption of the desired signal
Ingress
193
A standard for home entertainment networking in which existing subscriber drop coaxial cabling and components are used to interconnect set-top boxes
MoCA
194
Allows up to 16 devices on the network, with a maximum of 300 feet of cable
MoCA 1.1
195
MoCA 1.1 offers ___ ____ MAC rates and __ node network extensions
175 Mbps16
196
MoCA 1.1 operates in the ___ – ____ MHz frequencyrange
500 – 1500
197
MoCA 2.0: offers net throughput MAC rates of ________(baseline mode) and _______ (enhanced mode)
400 Mbps800 Mbps
198
MoCA 2.0 operates in the ___ - ____ MHz frequency range
500 - 1650
199
To ensure that MoCA energy remains within the home, the CommTech 3 must install a __________ in the drop
POE filter
200
FCC part 76.614
States that any leakage source which produces a field strength of 20 uV/m or greater at a distance of 3 meters in the aeronautical radio frequency bands shall be noted and such leakage sources shall be repaired within a reasonable period of time
201
Three main features of OWE:
First Time User Experience (FTUE) XFINITY ProfileProgress Bar
202
The residential services are:
XFINITY TVXFINITY VoiceXFINITY InternetXFINITY Home
203
Xfinity apps
XFINITY Connect AppXFINITY Home AppXFINITY TV Go AppXFINITY Player AppXFINITY Remote AppXFINITY Wi-Fi App
204
Suite of applications that enable customers to enjoy the services they have from Comcast on as many platforms as possible
Converged Products:
205
Allows customers to make outgoing calls via a virtual telephone number using a mobile device without using wireless minutes
Voice 2go
206
The three main components of a Home Theater system are:
AudioVideoEnvironment
207
There are three significant considerations in a Home Theater application
Audio qualityAudio formatsAudio equipment
208
Latent or out-of-sync audio
Lip-Sync
209
The different types of audio formats are:
MonoStereoSurround Sound
210
Key elements of a surround sound system are:
PreamplifierPower AmplifierSurround Sound ProcessorAudio/Video Receiver
211
Tiny dots that convey light and combine to form a video picture
Pixel
212
Short for "picture element."
Pixel
213
The number of scans from the left side of the display to the right and back that occur in one second
Horizontal Scan Rate
214
The number of times per second that the scan sequence is repeated from the top of the display
Vertical Scan Rate
215
Visible fading of luminance between scan cycles on video displays
Flicker
216
The method of displaying television pictures in which the picture is displayed in two halves (one of odd-numbered lines, one of even-numbered lines), that are interlaced together to create the full picture
Interlaced scanning
217
Standard television pictures are composed of ___ horizontal lines that scan across the screen in less than the blink of an eye
480
218
The ____ format utilizes two sequential fields of 540 lines each
1080i
219
Interlacing produces __ fields or __ complete frames every second
6030
220
Television pictures are displayed in a single pass, instead of the two fields used with interlaced scanning
progressive scanning
221
The common progressive scan standards that you will see are:
480p, 720p, and 1080p
222
Identifies and removes redundant information between successive frames of the picture
MPEG compression
223
Separating successive frames into two types of video information—that which remains unchanged from frame to frame, and that which is updated frame to frame
Digital Compression
224
The most important part of a Home Theater system is the?
video display
225
The three main steps involved in site preparation when installing new equipment in a customers home are:
Determining customer expectationsAnalyzing the current setupPlanning the signal flow
226
A common problem with Home Theater systems is:
no picture or poor picture
227
The most common causes of picture failure in a Home Theater system are:
Wrong display settings.Lack of power to various components.Cable routing malfunction, loose or disconnected cables
228
Ground loop issues are basically caused by
A 60-cycle AC component in the audio connections
229
When multiple carriers oscillating at different frequencies are transported simultaneously in the same medium
Frequency Division Multiplexing (FDM)
230
A return path impairment that can have a severe effect on return path signal quality
CPD
231
The transfer of energy from one device to another is most successful when both devices are of the same
Impedance
232
Signals propagate through either of two mediums
guided and unguided
233
Provides a physical path along which the signals are transported; such as those used in cable TV
Guided media
234
Can be water or the air around us. The signal is transmitted from a transmit antenna to a receive antenna
Unguided media
235
Three components of an electrical circuit:
VoltageCurrentResistance
236
The electromotive force (or pressure) that causes electrons to flow in a circuit
Voltage (E)
237
The amount of pressure required to cause one ampere of current to flow through one ohm of resistance
One volt
238
The flow of electrons through a conductor
Current (I)
239
The opposition a material offers to the flow of electrical current
Resistance (R)
240
One coulomb passing a given point in one second is equivalent to
One amp
241
German physicist, investigated galvanic currents and established the mathematical relationship between voltage, current, and resistance
Georg Simon Ohm
242
voltage =
current X resistance
243
A flow of IP data supplied to a processor at a rate fast enough forreal-time decoding
Streaming
244
Enables media files—movies, TV shows, music, and so on—to be played on TV, from various sources like computers, hard drives, the Internet, and media servers
Home Media Streaming
245
An all-in-one device that connects the customer’s Internet, phone, and home networking, enabling them to share files with computers and other electronic products that are connected to their home network
Wireless Gateway
246
A term used in IP telephony for methodologies and transmission techniques that manage the delivery of voice, using IP packets
Voice over Internet Protocol (VoIP)
247
Three ways a customer can access Enhanced Voicemail:
1. Dial *992. Dial home telephone number3. Online, through XFINITY Connect
248
A customer can access Enhanced Voicemail while away from home bypressing
#, once the greeting begins
249
Customers can easily check their email, listen to voicemail, and manage their address book and calendar from any computer with an internet connection.
XFINITY Connect
250
XFINITY Connect allows customers to:
Review call historyEasily manage everything related to their account without calling Customer Service
251
How customers can access XFINITY Connect:
If a customer has XFINITY Internet and XFINITY Voice, the login is their primary email username and password.If a customer is only subscribing to XFINITY Voice, the login will be the XFINITY Voice 10-digit home telephone number and voicemail password.For a new voicemail setup, simply dial *99, the system will prompt you to create a new passcode. Note, the last four digits of the telephone number is NO LONGER the default passcode.
252
website to access Xfinity Connect
https://login.comcast.net/login
253
Phone service that transmits telephone calls over a public network, such as the Internet
IP Telephony
254
A term used in IP telephony for methodologies and transmission techniques that manage the delivery of voice, using IP packets
VoIP
255
Technology used to transmit voice and related calls over a data network
IP Phone/IP Voice
256
A device that allows the telephone company to route and connect customers to one another
Telephone Switch
257
Worldwide network of public circuit-switches used by traditional, local, and long-distance companies
Public Switched Telephone Network (PSTN)
258
Central Office (CO) server that routes calls to other IP-based phones or through the PSTN
Soft switch (Software Switch, VoIP Switch, or CMS)
259
A telephone line dedicated to a specific subscriber. This line sends signals through the system, based on a subscriber making and receiving calls.
Subscriber Line
260
A site where telecommunications companies (such as cellular and long-distance providers) physically interconnect their systems with other networks (such as local telephone companies or cable companies)
Point of Presence (POP)
261
A condition caused when packets are not received in the correct order, or when they take too long to arrive at their destination.
Jitter
262
Delay associated with inconsistencies, or impairments, in the data transport stream.
Latency
263
Voice packets are given priority over other types of data traveling within the Comcast network. This managed delivery ensures high-quality voice packet interpretation.
Dynamic Quality of Service (DQoS)
264
The only time a call from an XFINITY Voice customer may use the public Internet is when the receiving party is using an ______________________.
internet-based service
265
When a telephone is on-hook, there is a potential difference of 48 volts between the tip and ring. This is called?
Supervisory or idle voltage
266
Ring voltage:
It may be anywhere from 60–90 Volts Alternating Current (VAC) at a frequency of 20 Hz.
267
In North America, a ____ pattern is the standard ring cycle.
2-4, two seconds of ring voltage followed by a four-second pause
268
In legacy telephone networks, talk battery and ring voltage come from the?
Central Office
269
Always disconnect the inside wire (IW) from the_________ before working on the wiring.
NID or eMTA
270
The total REN value in an individual circuit should not be greater than?
5
271
CPE that may have REN specifications:
Answering machineFax machinePhone modemMonitoring devicesAlarm systems
272
The voice portion of the eMTA can interpret both
DTMF and pulse signaling
273
Also known as Touch-Tone, this form of audio signaling was introduced by Western Electric in 1963
DTMF: Dual-tone multi-frequency signaling
274
In earlier pulse dialing systems, noise generated in the copper pairs could be interpreted as a pulse by the switch rendering:
Wrong telephone numbers
275
An eMTA features up to ____ hours talk time and up to _____ hours of standby battery
fiveseven
276
An eMTA features up to ____ hours talk time and up to _____ hours of standby battery
fiveseven
277
When utilizing an in-house amplifier, the eMTA must be connected to a:
passive port
278
If the customer has opted for a backup battery, it is recommended that they also have a ___________ on hand, in the event of a power outage.
wired phone
279
eMTA Location Guidelines
Place near customer¡¦s primary computer, if possible.Do not place eMTA in an attic or unheated basement space.Do not place the eMTA too close to a furnace or in any other area that is environmentally unsuitable for the unit.Keep away from wireless devices, and access by children or pets.Ensure adequate ventilation
280
Do not place an in-home amplifier between the tap and the eMTA unless the amplifier has an approved:
eMTA port
281
eMTA battery provides _____________ hours of standby time in case of power outage
five to seven
282
Backup batteries will not be available for purchase from Comcast by customers subscribing to:
“Unlimited Select.”
283
All of a sudden, the eMTA Link lamp or LED goes off. What could be the reason?
Ethernet cable disconnected, or computer has been powereddown. Possibly the router has lost power
284
What does the eMTA Telephone light do when the telephone is off the hook?
The lamp flashes
285
What does the eMTA Telephone light do when the telephone is off the hook?
The lamp flashes
286
How do you know if the eMTA battery is low?
Indicates a low battery
287
If all the lights flash, it is an indication that:
foreign voltage is present.
288
Name two ways to discourage the customer from unplugging the eMTA from a dual jack when they are trying to unplug their phone.
Wire in such a manner that the eMTA is plugged into the bottom jack to minimize accidental disconnectionUse a red "Do not remove" tag to block the unused port
289
Once the eMTA is hooked up, you can access a GUI to check signal levels by using:
192.168.100.1
290
Line test set common features:
» Monitor mode (on hook): Primarily for monitoring of a telephone line while on hook.» Talk mode (off hook): Will draw dial tone and is used to test the analog phone line» Speaker phone: Provides hands-free listening in both monitor and talk modes» Polarity test: Used to check polarity of the tip and ring, for tone signaling, and receiving signal from the tone-generating unit» Talk battery: The butt set can power a wire pair for voice communications» Dialing and calling capability
291
Indicates the pair polarity, detects a short circuit, and indicates the presence of “talk battery” (connection to the network)
Toner
292
Older wiring is often referred to as ____________, or Category 1 (CAT 1) wire.
station wire
293
With station wire the_____ and___ wires are used for the primary line.
greenred
294
The twists in Category 3,5 and 6 wire help prevent __________ and cancel out noise that might be induced onto the wire from adjacent pairs or exposed wire.
cross talk
295
All the wires used at Comcast start with “white” because white (tip) refers to the first five pairs:
» White/Blue» White/Orange» White/Green» White/Brown» White/Slate
296
____________________ silver satin cables should always be used from the eMTA to the wall jack, to prevent reverse polarity.
Electrically straight
297
4P4C connector -
4 wire (handset coil cord)
298
6P2C connector -
2 wire – RJ11 – one phone
299
6P4C connector -
4 wire – RJ14 – two phones
300
6P6C connector -
6 wire - RJ25 – three phones
301
8P8C connector -
8 wire – RJ45 - Ethernet
302
Contrary to popular belief, the handset cord is not a ______________ It has been erroneously referred to as an RJ22, RJ10, or RJ9. It is simply a unique sized 4P4C connector designed for the handset.
registered jack
303
When a fax machine is used with XFINITY Voice, the fax machine will:
Share the incoming phone line
304
Pre-installation Guidelines
Verify that tools and equipment have been chargedStock XFINITY Voice Welcome KitsEnsure that pocket guides/other resources are availableKnow how to use the mobile device/laptop and the IVRUnderstand troubleshooting stepsCheck work order; find out whether the customer requires a DOCSIS 3.0 deviceVerify that XFINITY Voice is shown on the work order before attempting the installation
305
What to do before beginning the actual installation
Confirm that the job is indeed what the customer orderedDetermine if additional jacks or wiring is neededHand the customer a Welcome KitDetermine if the customer has a monitored alarm systemAsk if the telephone is connected to an entry buzzer or door-entry systemAsk the customer what devices they have at home that are connected to the telephone line. This will help in ensuring compatibility.If there is a monitored security alarm, have the customer notify the alarm service to test the functionality of the alarm system.Once tested and verified, or if alarm is not monitored, ask the customer to place the alarm in "test" mode.
306
In a ____________ wiring configuration, the twisted-pair coming in from the NID goes, consecutively, through all the phone jacks
loop-through
307
In homes with loop-through wiring, the primary line may have been moved to the ____________ pair because of damage to the _________ pair somewhere in the wall
black/yellow red/green
308
Disadvantage of loop-through wiring configurations
If one part of the loop goes bad, the rest of the circuit is often affected.It inhibits/complicates addition of a special service, such as a fax machine, to just one phone jack.
309
In a home-run wiring configuration, also known as ____, each outlet is fed directly from a central location
star
310
When to use back-feed installation:
After determining that the existing wire can support a back-feed, and that it is the most reliable and efficient solution
311
When to use dedicated feed:
Whenever the customer has a PBX and/or monitored alarm system or when the existing phone jack wiring is determined to be faulty
312
Disadvantage of dedicated feed installation:
Requires spare pairs that are not always availableMay require installation of an additional telephone wire to facilitate the feed
313
Only _________ alarm systems should be connected to the phone service
monitored
314
Allows an alarm panel to control access to active phone pairs, and seize those pairs even if the customer is using the telephone
Line seizure
315
Be sure that the alarm system is in ________ before beginning work, to ensure that an alarm is not triggered
Test Mode
316
Some ILECs utilize "______________," a service that keeps talk battery on the pairs even if the location no longer subscribes to their phone service
soft dial tone
317
Before the eMTA can be connected to the customer’s home wiring, the existing service must be disconnected at the?
NID
318
Unplugging the modular connector in the NID is a safety step. It prevents?
being hit by ring voltage
319
Insulate wiring disconnected at the NID with __________or similar if it is going to have continuity back to the eMTA.
Scotchloks
320
What is the preferred method of connecting the eMTA to the house wiring?
Disconnect the ILEC and connect the eMTA with a dedicated line to the NID
321
An _____ jack isolates the alarm panel from the eMTA in the telephone circuit.
RJ31X
322
In a phone installation with an alarm system, a _________ _____ _____ is always the first active device in the telephone circuit
monitored alarm panel
323
Exceptions to opening the alarm panel:
When you do not know the color/pair of inside wiring that has been previously used to supply dial tone from the NID to the RJ31XWhen you need to isolate a trouble condition
324
Rule of Three for XFINITY Voice:
1. Confirm the customer’s new telephone number.2. Illustrate how to use voicemail, referencing the steps in the Welcome Kit.3. Talk about XFINITY Connect where customers can go online to check voicemail, see call history, or set options
325
There are three methods for activating XFINITY Voice services. They are (in order of preference):
1. Via the workforce management application on the company-issued mobile device or laptop2. Via the Online Tech Activation Tool, using the customer’s computer3. Via the Interactive Voice Response (IVR).
326
Often called Cable Modem MAC, is typically used when provisioning an installation for both XFINITY Voice and Internet
CMAC
327
Refers to the telephone only portion of the eMTA. It is typically used for provisioning XFINITY Voice when using the IVR
MTA-MAC
328
MAC address added to the customer's account in CSG/ACSR markets
CMAC
329
Typically used for provisioning XFINITY Voice when using the IVR.
MTA-MAC
330
Used for provisioning via the mobile device in AMDOCS/Comtrac/Cable Data markets
The serial number
331
An eMTA or modem that has not been activated receives a ____________boot file which allows it to communicate with our network but not surf the Internet
walledgarden
332
After activation the first test call:
verifies inbound calling, long distance, and calling features
333
After activation and placing the first test call, keep the first test call connected and prompt a second test call to validate:
call waiting and voicemail
334
If a password is required, to validate voice mail, use?
the last four digits of the telephone number
335
Use only________________to connect the fax machine
single pair silver satin (two wires)
336
Single pair silver satin utilizes pins ______ of the connector
2 and 3
337
Why do we only use single pair silver satin wire for fax machines?
Using two-pair (four wire) silver satin may allow voltage to be present on pins 1 and 4 of the modular connector. The eMTA provides supervisory voltage on pair two even if the customer subscribes to only one phone line. This pair two voltage wreaks havoc with several models of fax.
338
There are three categories that can help us determine where an XFINITY Voice problem may occur
RF or coaxCopper wiring or jacksThe eMTA
339
Keenness and depth of perception, discernment, or discrimination especially in practical matters
Acumen
340
The ability to make good judgments and quick decisions, typically in a particular domain
Business acumen
341
The Comcast Credo
"We will deliver a superior experience to our customers every day. Our products will be the best and we will offer the most customer-friendly and reliable service in the market."
342
Two versions of Business TV:
Private ViewPublic View
343
Typically private/professional businesses where food and/or alcohol is not sold for immediate consumption/not the main source of revenue.
Private View
344
Includes, but is not limited to, locations where the bulk of the revenue is derived from the sale of food and/or alcohol
Public View
345
Some services available to Residential customers are excluded in Business Services. The excluded services are:
DVRVODImpulse PPV (IPPV)Premium channels
346
Business TV is not available to venues that:
Charge an admission or entry fee. (However, a monthly or yearly membership is not considered as admission fee. Thus, Business TV is made available to health clubs or special interest clubs.)
347
Service levels for Business TV Private View:
Business TV BasicBusiness TV Information & EntertainmentBusiness TV StandardBusiness TV Preferred
348
Business customers are required to sign a ______________________ in order to establish service.
service order agreement/contract
349
Service levels for Business TV Public View:
BasicDigital Basic PlusDigital StandardDigital DeluxeSports & Entertainment StandardSports & Entertainment Deluxe
350
There are three major music licensing organizations which provide the rights for businesses to play licensed recordings:
ASCAPBMISESAC
351
Benefits of bundling
FlexibleOne service providerEfficientCost effectivePeace of mind
352
Most VoIP service providers use the _____________(Internet Phone) to carry phone traffic; Comcast does not.
public Internet
353
Business Voice is transported over _____________________________, giving customers the clarity they expect.
Comcast’s private, advanced broadband network
354
Business Voice Service Capabilities & Customer Support
Operator AssistanceDirectory AssistanceCall RestrictionsE911 Emergency CallsDo-Not-Call RegistryDirectory Listings
355
Features that are available only to Business customers:
Call Forward No AnswerHunt GroupsExtension Dialing
356
A serviceability check consist of two components:
1. Serviceability of the location2. E911 serviceability
357
The demarcation point for Small Business Voice services is?
The RJ telephone connector on the back of the eMTA
358
When installing Business Voice, always use a?
dedicated eMTAThe Ethernet port should not be used for Internet service
359
___________ circuits can be noisy and more susceptible to migration and corrosion
Ground start
360
_________circuits are almost always used in IP voice telephony
Loop start
361
1 Baud equals ____, thus 9600 Baud is _______.
1 bps9.6kbps
362
Metro Ethernet (Metro-e) customers can select one of the three Classes of Service (CoS) that best meets their applications’ performance requirements:
1. Basic2. Priority3. Premium
363
What is the speed range for Metro-e?
1Mbps–10Gbps
364
What website would you direct a customer to for anything business class related?
http://business.comcast.com/
365
Business Internet Customer Support a technician can be dispatched within ______, including on weekends and holidays
4 hours
366
Combines the functions of a cable modem and a router in a single device
IP gateway
367
It is the process of modifying IP address information in IPv4 headers
NAT
368
Some routers come with a ___________option which, when enabled, essentially disables the networking functionality and the gateway basically becomes a modem.
Bridge Mode
369
Managed Internet access, available to corporations that have a distributed, mobile workforce of at least 100 persons
Teleworker Internet
370
DOCSIS 1.0 issued
March 1997
371
DOCSIS 1.1 added full standardization and quality of service capabilities
April 1999
372
DOCSIS 2.0 released, to meet the demand for enhanced upstream transmission speeds
December 2001
373
DOCSIS 3.0 released; it supported enhanced upstream and downstream transmission speeds and Internet Protocol version 6 (IPv6).
August 2006
374
Aims to support capacities of at least 10Gbit/s downstream and 1Gbit/s upstream
DOCSIS 3.1
375
All DOCISIS specifications currently support:
6 MHz wide downstream channels, modulated at 64 QAM or 256 QAM, with receive levels between -15 and +15 dBmv at the cable modem
376
Upstream channels are __ MHz wide and depending on the DOCSIS version, support these upstream modulation schemes:
3 MHzQPSK, 16 QAM, 32 QAM, and 64 QAM
377
Transmit levels for QPSK are:
+8 to +58 dBmv
378
Transmit levels for 64 QAM are:
+8 to +55 dBmv
379
Comcast has allocated downstream DOCSIS carriers to be located in the higher end of the downstream bandwidth, somewhere between:
500 and 700 MHz
380
DOCSIS supports frequencies anywhere between:
88 MHz and 860 MHz
381
Upstream carriers are currently located somewhere between:
5 and 42 MHz
382
Technology that allows multiple cable boxes to utilize a single radio channel. Each box is assigned a code for its upstream bit stream
S-CDMA: Synchronous - Code Division Multiple Access
383
Load-sharing technique for logically combiningmultiple DOCSIS channels
Channel Bonding
384
Electromagnetic wave that generally falls in the frequency range of 3 kHz to 300 GHz
RF or Radio Frequency
385
A protocol for assigning dynamic IP addresses to devices on a network
Dynamic Host Configuration Protocol (DHCP)
386
The modem scans the downstream QAM channels, looking for an upstream channel descriptor. A __ occurs if the cable modem does not find one within a few seconds
T1
387
The modem waits for an opportunity to communicate with the CMTS. If it does not get an opportunity within about 12 seconds, a __ timeout occurs.
T2
388
The cable modem has sent a ranging request upstream to the CMTS for transmit and timing information. If the modem does not get a response within 200 milliseconds, a __ Timeout occurs. After 16 attempts, the modem will reboot to restart the registration process from the beginning.
T3
389
Once a cable modem is online, it continues to communicate with the CMTS. The modem watches for Keep Alive requests from the CMTS. If it does not receive one after 30 seconds, a __ timeout occurs.
T4
390
After __ T4s, the cable modem will reset
16
391
T3 and T4 timeouts can be a sign of an
upstream or downstream problem
392
A complex number with a resistive and reactive component. It is a function of the frequency of the applied signal, and is unrelated to length
Characteristic Impedance
393
The condition that results when two components of a system are operating at a different impedance
Impedance Mismatch
394
Performs a function similar to that of a cable amplifier’s equalizer. However, instead of equalizing the entire 50-860 MHz downstream or 5-42 MHz upstream, it deals with just a single channel.
Adaptive Equalization Technology
395
A feature in Scout that shows the presence or absence of linear distortions in the RF portion of the return path
Scout Flux
396
Cable modems communicate with the CMTS every _________ to characterize network conditions
20 seconds
397
How do you access Scout Flux data for a single modem
Go to the Device Watch tab and select Customer ReportIn the search box, you can enter an account number, phone number, MAC address, IP address, FQDN, or name for the customer.After entering the information, click the Submit buttonThe customer report will look slightly different for various customers, due to the equipment on the accountClick on the CM1 page (if it shows up on your screen), and go to the Modem Toolbox at the bottom of the pageTo open up Scout Flux, click on the Scout Flux icon - the sine wave
398
To troubleshoot single premise issues in Scout Flux, you will need to concentrate on the ____________________________ graphs shown in the second row
In-Channel Frequency Response (ICFR)
399
A measurement of how consistent the signal response is from the beginning to the end of the channel space
ICFR
400
ICFR values, and what they indicate:> 3.0 dB -< 3.0 dB -< 1.5 dB -
-the problem should be investigated and fixed-required level to pass Techlink certification-ideal circumstances at the modem
401
ICFR Ripple Count:Fewer ripples would generally indicate a?whereas numerous ripples would most llikely indicate a?
house problemplant problem
402
The adaptive equalizers are sent fresh commands for equalization every?
20 seconds
403
talk battery
approx 3-9 VDC
