Study Sheet Cards Flashcards
Name 5 troubleshooting steps for Voice CPE if cannot receive call or data
- Verify dial tone(DT)
- correct polarity
- inbound/outbound
- verify proper loop current for off-hook status (approx 33mA)
- CPE is set for 9600 baud.
Name 4 troubleshooting steps for Voice CPE if cannot dial out
- Verify dial tone(DT)
- correct polarity
- inbound/outbound
- make sure that a data device is not on a voice line
This allows a group of phone stations to access a common set of telephone lines.
Key System (KSU)/Public Exchange Branch (PBX)
Which type of punchdown block is used for data applications
110 Block
In BCV (Business Class Voice) it is the interface between the eMTA and the 66 or 110 block demarcation point
RJ21X
What is the Backup time with the TM512 in use?
8 hrs
What is the output wattage of the LPSU?
50-60Watts max
What is the Backup time with the TM512 Idle?
16hrs
What is a domain name?
a descriptive name for an address or group of addresses on the Internet
If after the installation of a POS (Point of Sale System) there is no connection, what should you check?
Verify proper polarity, inbound/outbound, number to dial out, verify input and output connections and ask customer to adjust baud rate to 9600.
What is the demarcation point on a 66 Block?
The left side
What is the demacation point for BCV services if there is a Comcast-provided eMTA?
The punch block itself or the telephone jack on the eMTA to which the Customer’s phone network is connected
What is the demacation point for BCV to a non-Comcast-provided eMTA?
if the customer provides the eMTA, the demarc point shall be the coax input connector to the eMTA
When a punch block is involved, what is the technician responsible of supporting?
UP TO the Customer (right) side of the 66 block
What places baseband signal onto standard RF channel carrier?
Video Modulator
What modifies the signal for various reasons such as resolution compatibility, encryption, and other reasons?
Video or Signal Processor
Switches high resolution video and audio for commercial applications
Multi-media Switcher
What eliminates unused channels and inserts local feeds?
Video Channel Filter
Device that connects the customer’s internal network to the Internet
Router
Device that acts as a FOCAL POINT in connecting multiple computers within one Local Area Network (LAN)
Switch
A managed hard drive connected to a LAN that can be accessible by anyone on the Internet as defined by a company’s Network Administrator
Network Attached Storage (NAS)
Connects building data wiring to Ethernet switch
Network Patch Bay
Provides less interference and is certified for data
110 punch-down connecting block
On a SMC, what should the technician support?
all connectivity UP TO the LAN side
What is the data throughput speed for the Incombent Local Exchange Carrier (ILEC) Network Interface?
1.54Mb/Sec
Two 50 pin connectors at each end of a 25 pair cable that connects an eMTA to a distribution block
RJ21x
568A
RJ45 Straight
568B
RJ45 Crossover
What is used as a standard alarm interface so that when the security system is unplugged, the outlets in the house should still function?
RJ31x modular jack
What are the input pair on a RJ31x modular jack?
terminals 4 and 5
What are the output pair on a RJ31x modular jack?
terminals 1 and 8
What are the color codes for cat-5e
BOGB: Blue, Orange, Green, Brown
What is used to seal around the cable if a firewall must be penetrated?
Fire barrier caulk or putty
What port does HTTP use
80/8080
What port does TCP use
20
When will you give a student feedback?
Daily
If you have a ride-along, giving the remote to the student is considered what type of discovery?
self discovery
What is the first thing you learn in managing?
memorizing and managing your anxiety
How do you want to treat the customer when you enter their home?
as a friend
What are the three types of learners?
Visual, auditory, Tactile (kinesthetic, hands-on)
What is meant by paraphasing
Reiterating what the customer just explained to or asked of you.
These are 5 ways to minimize anxiety
Remember that the audience is your friend, memorize the most important parts of what you’ll say, practice positive self-talk (remind yourself before you initiate the conversation that you are the expert), breathe, check your appearance
What are the 4 components your voice consists of?
Rate, volume, force and pitch
what is the 3-5 second rule?
look for 3-5 seconds then away for same amount of time, repeat; also means keeping a safe following distance behind another vehicle
What is Cross Modulation (XMOD)
the “crossing” of modulation from one channel to another
What is the first thing you want to do to make a good impression
build good rapport
what is passive listening?
indicationg that you are paying attention, as the customer speaks, i.e.: yes, ok, uh huh
What are features of comcast service.
elements that enhance the product and give it more usability
What are benefit features?
the features that will directly meet the customer’s needs
This works by separating successive pictures into two types of video information – that which stays the same and that which changes
Digital compression
A device or software that enables CODEC for digital video
Video CODEC
What is CODEC?
A compression/decompression process
What is a video CODEC?
a device or software that enables codec for digital video
What is the major advatage of MPEG?
files are much smaller for the same quality
How do MPEGs work?
by identifying and removing redundant information between successive images of the video
What are MPEG-1s used for?
Video CDs
What are MPEG-4s used for?
Internet streaming, Video on cell phones and Interactive TV
What are the three kinds of encoded pictures for MPEG?
I-pictures, P-pictures, B-pictures
How many pictures are in 1 MPEG frame?
12
What is an I-picture?
Intra-coded picture, which is a single compressed picture that contains all the spatial information of a video picture
How are I-pictures encoded?
as a single freestanding image, with no reference to preceding or subsequent pictures
All the pictures before the next I-picture are called?
Group of Pictures (GOP)
What is a P-picture?
Predictive pictures, which are computed pictures based on the nearest previous I- or P-picture
How is the P-picture calculated?
By comparing the previous and successive pictures and recording only the changes in the picture
What do Bi-directional pictures do?
use both past and subsequent pictures as references to calculate the compressed picture data
This defines a cryptographic protocol for protecting audio/video entertainment content from illegal copying, interception and tampering
Digital Transmission CONTENT Protection (DTCP)
What does Digital Transmission CONTENT Protection (DTCP) do?
defines a cryptographic protocol for protecting audio/video entertainment content from illegal copying, interception and tampering
What does Analog Copyright and Piracy Technology (ACP) do?
Prevents or distorts copies made over an analog connection between a source player and a DVD recorder, DVR, PC, or VCR
What is Conditional Access (CA)?
the protection of content by requiring certain criteria to be met before granting access to this content
What protects content by requiring certain criteria to be met before granting access to this content?
Conditional Access (CA)
What does copy protection do?
gives content providers the security that their content is protected, but allows our customers to access it
What is the difference between Content Protection (CP) and Conditional Access (CA)?
Content Protection is the a company to Comcast and Conditional Access is Comcast to the customer
What does a Key System do?
Allows a group of phone stations to access a common set of telephone lines
What is the main use of a 110 punch down block?
data applications and less interference
What is the RJ21x used for?
to interface between the eMTA and the 66 or 110 block demarcation point
If the demarcation point is on the left side what is this refering to?
a 66 or 110 punch down block
What does a Video Modulator do?
Places baseband signal onto a standard RF channel carrier
What does a Video/Signal Processor do?
modifies the signal for various reasons
What does a multi-media switch do?
switches high resolutin video and audio for commercial applications
What does a Video Channel Filter do?
eliminates unused channels and inserts local feeds
What does a router do?
connects the customer’s internal network to the Internet
What does a switch do?
acts as a focal point in connecting multiple computers within one Local Area Network (LAN)
What is a Network Attached Storage (NAS)?
a hard drive connected to a LAN that can be accessible by anyone on the Internet as defined by a company’s Network Administrator
What does a Network Patch Bay do?
Connects building data wiring to an Ethernet switch
What is the purpose of a 110 punch down block?
for data usage and provide less interference
What is a RJ31x modular jack?
standard alarm interface so that when the security system is unplugged, the outlets in the house should still function
What is fire barrier caulk and/or putty used for?
to seal around the cable if a firewall must be penetrated
What are elements that enhance the product and give it more usability?
features
What does digital compression do?
Separates successive pictures into two types of video information – that which stays the same and that which changes
What works by identifying and removing redundant information between successive images of the video?
Moving Pictures Expert Group (MPEG)
What is the first step that you should do when troubleshooting BCV, where the customer cannot dial out is:
Verify dial tone and polarity
What term describes an IP that can be SEEN ACROSS the internet?
Public routable
To provide good wireless coverage where some laptops may be outside:
Place the Access Point (AP) near a window
What is the range of an 802.11n wireless Access Point?
UP TO 160’
The range of an 802.11b thru g wireless Access Point is:
25-150’
802.11g is compatible with: a, b, f, or only g devices?
compatible with 802.11b
Virus that triggers when a certain condition is met (SUCH AS A DATE) are said to be:
event watching
Virus that exploits SECURITY HOLES are:
Worms
The process of READDRESSING your packets with routable IPs is called:
Network Address Translation (NAT)
A virus that appears to be a normal program, but when run causes damage is a/an:
Trojan virus
The relationship between you and the customer is called:
A rapport
How often should a champion meet with a coworker?
If no “daily” answer then use as often as schedules permit
When a champion provides feedback, it should be:
Honest yet tactful
The adult learning styles are?
Visual, Auditory, tactile
Which jack is used with the 8 line eMTA for phone lines?
RJ21x
Which malicious software uses an ADDRESS book to use to invade other computers?
E-Mail virus
Repeating what was just said in different words is:
paraphrasing
An IP address of 192.168.2.1 is:
Non-routable
The 3 video encoded picture sequence for MPEG are
I-Picture, P-Picture, and B-picture or Bi-directional Picture
The company Macro-vision is a company that offers what kind of services?
Developing Analog Anti-copying and Piracy Technology (DACP)
The main types of firewall rules are?
Proxy, packet filtering, and stateful inspection
How often should a champion meet with a worker?
as often as possible
What IPs are private non-routable?
10.x.x.x, 172.16.x.x, 172.31.x.x, and 192.168.x.x
What subnet mask would be used with a static IP of 70.123.16.75/29
255.255.255.248
What is the routable static IP of a BCI account with a Network IP of 70.23.47.87/30?
70.23.47.88
What is the Comcast tech log-in password for an IP gateway?
D0nt4g3tme
What is the process of REDISTRIBUTING your IPs into smaller groups called?
subnetting
What is the default log-in IP of a IP GATEWAY?
10.1.10.1
What subnet mask would indicate 13 static IPs?
255.255.255.240
What is the MULTIPAIR connector used in telephony for a 25pair cable?
RJ21x
What are the even numbered pins on the right side of a 66 block?
Customer ring
The IP address 169.254.x.x is called:
Autoconfiguration
The feature that distributes calls to multiple lines on BCV is:
Hunt group
When routing through a DROP CEILING, you should:
Suspend cables above the tiles
What is the first steps when trouble shooting BCV, when the customer DOES NOT GET INBOUND is:
disconnect eMTA from inside wire and check voltages on inside wiring
What jack is used for a two line phone?
RJ14
What jack is used for a three line phone?
RJ25
What is the speed of a telco T1?
1.54Mbps
An IP address of 172.17.x.x is:
non-routable
Leading ghosts appear on what side of the picture?
Righł
Following ghosts appear on what side of the picture?
Left
What is the technique used to remove parts of the video information from a 6MHz channel in order to make room for other channels?
Digital Compression
What does digital compression do?
it is the technique used to remove parts of the video information from a 6MHz channel in order to make room for other channels
The main difference between MPEG and other Codecs is:
MPEG files are much smaller than other Codec files for the same quality
What interference is caused by the carrier from one channel operating in the space of another channel?
Co-channel
What is co-channel?
the interference is caused by the carrier from one channel operating in the space of another channels
What is the power output of an 8line eMTA Local Power Supply unit?
48VDC/50Watts (60 Watts max)
What is the expected noise inside of an amplifier (even without input signal)?
-59.2dBmv
What interference is caused by the carrier from one channel operating in the space of another channel?
co-channel
What is co-channel?
the interference is caused by the carrier from one channel operating in the space of another channel
What is the power output of an 8line eMTA Local Power Supply Unit (LPSU)?
48VDC/50Watts (60 Watts max)
What is the expected noise inside of an amplifier (even without input signal)?
-59.2dBmv
What is the noise added to the input signal called?
Amp’s Noise Figure (NF)
This device inserts a baseband signal onto a carrier
Video Modulator
What is the minimum processor speed for a new CHSI installation on Windows XP?
300MHz
What is the minimum hard drive space for a CHSI install on Mac OS 10.4?
100mb
What type of questioning requires you to acknowledge the customer intermittently during their talking?
Passive listening
A directional coupler is used in BCTV as a:
Channel inserter
A directional coupler is used in BCTV as a:
Channel inserter
Channel inserter
What piece of equipment can be found between Comcast’s modem and the customer’s data patch panel?
Router
What are the 3 components of a fiber optic cable?
Core, cladding, and coating
What is the range of an 802.11n router?
What is the up to 160 feet
What are the different types of routers?
B, A, G, and N
Which 802.11 router is NOT on a 2.4GHz frequency?
A
What are the four parts of viruses?
Replication, event watching, camouflage and delivery
When a virus inserts copies of itself into other program files and each descendant of a virus then replicates itself each time its host is read by the computer, what type of virus is represented?
Replication
What does a replicating virus do?
it inserts copies of itself into other proram files. Each descendant of a virus then replicates itself each time its host is read by the computer
What does a camouflage virus do?
the virus replicates itself, it creates a different fake code to break up its identifying signature.
Which virus replicates itself and creates a different fake code to break up its identifying signature?
camouflage
What are the main types of viruses?
Executable, E-mail, worms, and trojan horse
What virus scans the network for another machine that has a specific security hole?
Worm
What virus scans the network for another machine that has a specific security hole?
Worm
What is adware?
a variant of spyware that displays advertising for products it thinks might interest you, based on the Web site you are browsing
What is the communications room?
a room or dedicated location on the customer’s premises that acts as a “hub” for various telecommunications services
What is the communications room?
a room or dedicated location on the customer’s premises that acts as a “hub” for various telecommunications services
What is a room or dedicated location on the customer’s premises that acts as a “hub” for various telecommunications services?
Communications room
What are the different types of ILEC connections?
66 Block, NID, and screw term block
What does the eMTA do?
Enables operators to deliver 8 lines of telephony, tiered data and other advanced Internet Protocol (IP) services
What is the difference between a 66 and 110 block?
110 is for data and has less interference
What is the difference between a 66 and 110 block?
110 is for data and has less interference
How much extra wire should be left around the mushroom spool?
1-3 feet
What is the standard interface for connecting multi-line telephone equipment?
RJ21x
Steps to try if the Point of Sale System (POS) does not connect after the installation:
Verify inbound/outbound at outlet, check dial out number (may need to dial “9”), confirm correct polarity, and adjust baud rate to 9600
What represents baseband AUDIO feed?
Music on Hold
What is the demarcation point?
Point at which company wiring ends and the customer wiring begins
What does a channel deletion filter and combiner do?
deletes unused channels and inserts local feed
What does a channel deletion filter and combiner do?
deletes unused channels and inserts local feed
What does a video modulator do?
Places baseband signal onto standard RF channel carrier
What is the Domain Name Suffix (DNS)?
abbreviation for the Internet service that locates and translates domain names into IP addresses
What is a technique by which several hosts or computers share an IP Address for access to the Internet?
Network Address Translation (NAT)
What enables a Local Area Network to use one set of IP addresses for internal traffic and a second set of addresses for external traffic, and provides a type of firewall by hiding internal IP addresses?
Network Address Translation
How many IP addresses does a /30 subnet have?
4
What is the subnet mask for a /30 subnet?
255.255.255.252
How many static IPs for a /30 subnet?
1
How many static IPs for a /29 subnet?
5
How many static IPs for a /28 subnet?
13
What is the subnet mask for a /29 subnet?
255.255.255.248
What is the subnet mask for a /28 subnet?
255.255.255.240
How many IP addresses does a /29 subnet have?
8
How many IP addresses does a /28 subnet have?
16
What is the technique of data flowing to and from the Internet and the computers on the local network, passing across the IP Gateway called?
Network Address Translation (NAT)
A group of computers geographically far apart, but are connected.
Wide Area Network (WAN)
Using a public network, this establishes a secure connection to an organization’s private network
Virtual Private Network (VPN)
Combined with the IP address, this allows a device to know which other addresses are local to it and which must be reached through a gateway or router.
Subnet Mask
A portion of a network that shares a common address component.
Subnet
This forwards requests for a particular IP port pair to another IP port pair
Port Address Translation (PAT)
A system of computers, peripherals, terminals, and databases connected by communications lines
Network
A group of computers and associated devices such as printers and servers that share a common communication line and other resources within a SMALL GEOGRAPHIC AREA
Local Area Network (LAN)
Software/hardware used to prevent unauthorized access from a computer system or network of computer systems
Firewall
What is the residential like product that we sell to customers for Internet?
Business Class Internet
What is the residential like product that we sell to customers for phone?
Business Class Voice (BCV)
What techniques do you apply to ensure that the customer understands what services he/she ordered?
customer education
What is the last thing you do before leaving the customer’s house?
customer education
What is the Point of Demarcation for Business Class Internet
the business customer’s LAN connection point on the IP gateway
What port is used for HTTP or Web traffic?
port 80
What port is used for FTP traffic?
port 20
How do you access the features for comcast BCI?
go to Team Comcast, click on Learning & Development and select CommCapsules
Should you ever change the remote settings on a BCI install?
No, always leave at default
What is the format for a continuous ping?
/ping(space)site(space)-t
/ping www.yahoo.com-t
How do you get to “back up settings locally” with BCI?
Configuration tools page, utility pull down menu
What is used to assign Static IP addresses to Comcast Business Class Internet customers?
Routing Information Protocol (RIP)
What port is used for SMTP, POP and E-mail traffic?
25
What port is used for HTTPS, or secure traffic?
443
What does Port Blocking do?
enables you to restrict specific local hosts from accessing particular Internet applications
What enables you to restrict specific local hosts from accessing particular Internet applications?
Port Blocking
What is the difference between Port Forwarding and Port Triggering?
Trigging is more secure but it runs slower
What allows you to restrict a computer within your Local Area Network from accessing certain Internet traffic by IP address and logic port?
Port Blocking
What allows a selected computer to bypass the firewall features of the gateway and permits unrestricted access from the Internet to that computer?
Demilitarized Zone (DMZ)
What area is used to tell BCI customer about all their features?
feature manager
What is the feature manager for?
it tells Business Class Internet customers about all their features
What star # is for activating call forward selective?
*63
What allows the customer to create list of people whose calls will be forwarded to a specific number?
call forward selective
What star # is for deactivating call forward selective?
*83
What star # is for activating call forward variable?
*72
What star # is for deactivating call forward variable?
*73
What star # is for deactivating “cancel call forwarding?”
- 70 (2008)
* 73 (post 2008)
How do you activate “cancel call waiting?”
press the flash button or the receiver button
What star # is for activating speed dial 8?
*74
What is speed dial 8 used for?
allows you to press 1 digit for the 8 most important phone numbers
What star # is for activating speed dial 30?
*75
What is speed dial 30 used for?
Allows you to press 2 digits for the 30 most important phone numbers
What star # is for activating call hold?
*52
What star # is for activating anonymous call rejection?
*77
What star # is for deactivating anonymous call rejection?
*87
What star # is for activating call screening?
*60
What star # is for deactivating call screening?
*80
What star # is for activating caller ID blocking per call?
*67
What star # is for activating private numbering plan?
2 + last 3 digits of number
How do you activate a multi-line hunt group?
the technician doesn’t, it is set up by provisioning
What star # is for activating terminal make busy (Do Not Disturb)?
*230
What star # is for deactivating terminal make busy (Do Not Disturb)?
*231
What star # is for activating call trace?
*57
What are the technician’s roles for a BCI install?
Site survey, and physical installation
What does the site survey consist of?
the technician confirming that the customer has the necessary infrastructure for the Business Class Voice
What represents a line card error?
Telephone light flashing slowly, about 1 per second.
Telephone light flashing slowly, about 1 per second represents what?
Line Card Error
What star # is for activating group make busy (for multi-line hunt groups)?
*232
What star # is for deactivating group make busy (for multi-line hunt groups)?
*233
What would a data only line be used for?
POS and fax
Which feature is unique to BCV customers?
remote activation of call forwarding
What star # is for deactivating the different types of rings on a phone?
*81
What is the power measurement for an eMTA when plugged into an outlet?
120VAC
What is the power measurement for an eMTA when running off the battery?
48VDC
Where do Business Class Voice customers go to pay their bill?
myebill.com
What is the star # for directed call pickup with barge-in?
*33
What is the star # for call pick up?
*98
What is the star # for directed call pickup?
*97
What is the star # for direct to voice mail?
*55
What is the star # for retrieving a parked call?
*88
What does call pick up do?
picks up a ringing call to any phone in a company
What does directed call pickup do?
this feature allows user to pick up a ringing call from a selected extension
What does direct to voice mail do?
this feature allows a user to transfer a call directly to user voicemail without the phone ringing
What is drop and insert?
a process that diverts (drops) a portion of the multiplexed aggregate signal at an intermediate point, and introduces (inserts) a different signal for subsequent transmission in the same position
A process that diverts and introduces a different signal for subsequent transmission in the same position:
drop and insert
Which Comcast Digital Cable service is NOT available to Business Class TV customers?
Video On Demand
What is the cable loss formula?
(cable footage/100)/dB=cable loss
How many MHz wide is 1 channel?
6MHz
How far from the channel edge is the video carrier?
1.25MHz
How far from channel video carrier is the sound carrier?
4.5MHz
How far from channel video carrier is color carrier?
3.58MHz
What are the signal leakage limits?
64uV/m
What is one of the two uV/ms measurements to look for concerning leakage?
15 microvolts per meter (uV/m) or greater at a distance of 30 meters (about 100 feet), at 5 to 54MHz and above 216MHz
What is one of the two uV/ms measurements to look for concerning leakage?
20 microvolts per meter (uV/m) or greater at a distance of 3 meters (10feet), at 54 to 216 MHz
What code title and part in FCC are the regulations for uV/m?
Code of Fedral Regulations, Title 47, Telecommunication, Part 76.
What causes Ghosts?
Ghosts are caused when a TV signal (of the same frequency and video content) arrives at a receiver just before, or just after the desired TV signal
What side of the screen do leading ghosts appear on?
Right
What side of the screen do following ghosts appear on?
Left
Which Ghosts appear on the right side of the screen?
Leading Ghosts
Which Ghosts appear on the left side of the screen?
Following Ghost
What type of ghosts are usually caused by signal reflection?
Following Ghost
What type of ghosts are usually caused by direct pick up (off-air signal getting into the cable system)?
Leading Ghost
What is caused in one channel by the carrier from another transmitter operating on the same channel?
Co-Channel Interference
Where is the majority of ingress entering the system?
Majority of ingress is usually between the tap and the customer’s TV set.
What causes Thermal Noise?
It is caused by random electron activity or the atoms that make up the conductor, resistor, or any part of the passive circuit in question
How do you access the Feature Manager for BCV?
Go to Team Comcast, click on My Teams, workgroups, type “feature manager,” click on Business Class Services - Feature Manager (Beta)
What causes random electron activity or the atoms that make up the conductor, resistor, or any part of the passive circuit in question?
Thermal Noise
What is Cumulative Leakage Index/Indicator (CLI)?
a mathematical value derived from the number and severity of leaks in the cable system
a mathematical value derived from the number and severity of leaks in the cable system
Cumulative Leakage Index/Indicator (CLI)
How long must leakage logs be kept on file?
at least 2yrs
What is the maximum Federal Communication Commission (FCC) limit of leakage allowed?
must be 64uV/m or less
What is the carrier-to-noise (C/N) ratio?
the difference in a peak carrier level, measured in dBmV, to the noise level, also measured in dBmV
What is the voltage off hook?
-6.5VDC +/- 2
What is the voltage on hook?
-48VDC +/- 2
What is the difference between on and off hook voltage?
42 Volts +/-2
How does Cross Modulation (XMOD) usually manifest itself?
As a VERTICAL bar
What does the “tree and branch” analogy refer to?
Coaxial cable with 30, 40, 60 or even greater cascade of amps
What is a combination of optics and RF that now replace Coaxial cable?
Hybrid Fiber Coax (HFC)
If you raise your levels by 1, your Composite Second Order (CSO), Composite Third Order (CTB), and Cross Modulation (XMOD) get worse or better and by how much?
Worse by 2
What is the primary source of hum modulation today?
the power passing chokes used in passive devices; splitters, etc
What is a phase modulation algorithm that a digital modulation scheme might shift a carrier in 90-degree steps?
Quadrature Phase Shift Keying (QPSK)
What is a digital modulation scheme that allows 2 channels of information to be transmitted at the same time on a particular frequency by changing the phase and amplitude?
Quadrature Amplitude Modulation (QAM)
What is a measure of signal strength relative to background noise in analog and digital communications?
Signal-to-noise ratio (SNR)
Who specifies the minimum amount of Modulation Error Ratio (MER) or signal-to-noise ratio (SNR) the set-top converter can handle before significant errors occur?
The manufacturer
What is a useful measurement for early detection of non-transient (noise) impairments?
Modulation Error Rate (MER)
What is a useful measurement for detection of transient impairments?
Bit Error Rate (BER)
What measures how often an error occurs in a given amount of data?
Bit Error Rate (BER)
What is useful for measuring long term system performance and periodic transient impairments?
Bit Error Rate (BER)
What is a method where additional data bits are added to the digital video bit stream to help identify and CORRECT any errors that may be caused by the transmission system?
Forward Error Correction (FEC)
What level should the signal not be higher than, between 5 and 42 MHz, in the drop from CPE to tap?
-30dBmV, anything higher will need to be fixed
What enters a Community Antenna TeleVision (CATV) system through damaged or otherwise improperly shielded coax cable or related components?
Ingress
What are the tests used to verify that the quality of the DOWNSTREAM signals at the customer end of the network meets the FCC and CFR standards?
Proof-of-Performance (POP) tests
What is the first step in troubleshooting when you get to a video service call?
Begin at the TV
What has the ability to carry and individually select different channels on a single cable by their unique FREQUENCY?
Frequency division multiplexing (FDM)
Which of these appliances does NOT interfere with the return path to create ingress? A. Air conditioners B. Microwaves C. Refrigerators d. All of the above
B. Microwaves
What is the term for RF signal entering the CATV system?
Ingress
What is the term for RF signal leaking OUT of the system?
Egress
What separates OR combines the AC power and the RF broadband signals?
Power Diplex
What separates (AND recombines) the forward and reverse signals?
Diplex Filter
Who did all these study cards so you could pass this test and collect major cash
Lisimba Shakir the MAN!!
What is usually selected to produce “FLAT” broadband signals to the INPUT of the first stage of amplification?
Input Equalizer
What determines the station’s OUTPUT tilt?
Interstage Equalizer
What is used to compensate for the fluctuations of the INPUT signal?
Automatic Gain Control (AGC)
What maintains the proper tilt and OUTPUT levels?
Automatic Level and Slope Control (ALS)
What converts the lower level “trunk” signals to a higher output that can be used for distribution?
Bridger Amplifier
What is a signal splitting device that plugs into a trunk/bridger chassis?
Feedermaker
What is the isolation amount for signal paths between the tap and output port on a directional coupler?
25dB or greater
What acts as a combiner with signals that flow in the opposite direction, such as return?
splitters
AC flow is determined by the placement of fuses or shunts in the ___________?
Splitter
Is the number on the tap added or subtracted from your meter when taking levels?
subtracted
What is used to introduce AC power into the network for use by the active devices?
Power Inserter
The power inserter has low/pass filters to preven the RF on the cable from entering the power suppply where its very low impedance would cause severe attenuation of the signals while at the same time causing what?
Egress
What converts the incoming light to RF signals?
Optical Receiver
What does the structure of Comcast National Architecture Layers NOT consist of? A. Radio Frequency distribution system B. Internet Backbone C. Converged Regional Area Network D. Converged Backbone
A. Radio Frequency distribution system
What two level system provides a very rudimentary form of multi-topology routing, which is a more urgent need of regional networks?
Converged and Internet Backbones
A strand map includes all BUT the following: A. span lengths B. poles C. streets D. amps
D. amps
How many IP addresses are used in a /28 subnet?
16
Static IPs come in blocks of?
1,5,13
What is the subnet mask of /30
255.255.255.252
How many routable addresses in a /28 subnet
13
How many routable IP addresses in a /29 subnet
5
What type of filter passes high frequencies well, but attenuates (or reduces) frequencies lower than the cut-off frequency?
High Pass Filters
What are problems in the RETURN path that are additive (become stronger as more interferences are added to the return path signals) called?
Funneling effect
