Author:
Whitechoc
ID:
72235
Filename:
CCT4
Updated:
2013-05-03 03:31:33
Tags:
Comcast CommTech4
Folders:

Description:
Learning Experience
Show Answers:

  1. Name 4 troubleshooting steps for Voice CPE if cannot dial out
    Verify dial tone(DT), correct polarity, inbound/outbound and make sure that a data device is not on a voice line
  2. 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), and CPE is set for 9600 baud.
  3. This allows a group of phone stations to access a common set of telephone lines.
    Key System (KSU)/Public Exchange Branch (PBX)
  4. Which type of punchdown block is used for data applications
    110 Block
  5. In BCV (Business Class Voice) it is the interface between the eMTA and the 66 or 110 block demarcation point
    RJ21X
  6. What is the Backup time with TM508 Idle?
    18hrs
  7. What is the Backup time with the TM512 in use?
    8hrs
  8. What is the output wattage of the LPSU?
    50-60Watts max
  9. What is the Backup time with the TM512 Idle?
    16hrs
  10. What is the Backup time with the TM508 in use?
    8hrs
  11. What is a domain name?
    a descriptive name for an address or group of addresses on the Internet
  12. 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.
  13. On a punch down block which side is the input and which is the output?
    Input is on the left side and output is on the right
  14. What is the demarcation point on a 66 Block?
    The left side
  15. 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
  16. 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
  17. When a punch block is involved, what is the technician responsible of supporting?
    UP TO the Customer (right) side of the 66 block
  18. What places baseband signal onto standard RF channel carrier?
    Video Modulator
  19. What modifies the signal for various reasons such as resolution compatibility, encryption, and other reasons?
    Video or Signal Processor
  20. Switches high resolution video and audio for commercial applications
    Multi-media Switcher
  21. What eliminates unused channels and inserts local feeds?
    Video Channel Filter
  22. Device that connects the customer's internal network to the Internet
    Router
  23. Device that acts as a FOCAL POINT in connecting multiple computers within one Local Area Network (LAN)
    Switch
  24. 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)
  25. Connects building data wiring to Ethernet switch
    Network Patch Bay
  26. Provides less interference and is certified for data
    110 punch-down connecting block
  27. On a SMC, what should the technician support?
    all connectivity UP TO the LAN side
  28. What is the data throughput speed for the Incombent Local Exchange Carrier (ILEC) Network Interface?
    1.54Mb/Sec
  29. Two 50 pin connectors at each end of a 25 pair cable that connects an eMTA to a distribution block
    RJ21x
  30. 568A
    RJ45 Straight
  31. 568B
    RJ45 Crossover
  32. 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
  33. What are the input pair on a RJ31x modular jack?
    terminals 4 and 5
  34. What are the output pair on a RJ31x modular jack?
    terminals 1 and 8
  35. What are the color codes for cat-5e
    BOGB: Blue, Orange, Green, Brown
  36. What is used to seal around the cable if a firewall must be penetrated?
    Fire barrier caulk or putty
  37. What port does HTTP use
    80/8080
  38. What port does TCP use
    20
  39. When will you give a student feedback?
    daily
  40. If you have a ride-along, giving the remote to the student is considered what type of discovery?
    self discovery
  41. What is the first thing you learn in managing?
    memorizing and managing your anxiety
  42. How do you want to treat the customer when you enter their home?
    as a friend
  43. What are the three types of learners?
    Visual, auditory, Tactile (kinesthetic, hands-on)
  44. What is meant by paraphasing
    Reiterating what the customer just explained to or asked of you.
  45. 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
  46. What are the 4 components your voice consists of?
    Rate, volume, force and pitch
  47. 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
  48. What is Cross Modulation (XMOD)
    the "crossing" of modulation from one channel to another
  49. What is the first thing you want to do to make a good impression
    build good rapport
  50. what is passive listening?
    indicationg that you are paying attention, as the customer speaks, i.e.: yes, ok, uh huh
  51. What are features?
    elements that enhance the product and give it more usability
  52. What are benefits
    the features that will directly meet the customer's needs
  53. This works by separating successive pictures into two types of video information -- that which stays the same and that which changes
    Digital compression
  54. A device or software that enables CODEC for digital video
    Video CODEC
  55. What is CODEC?
    A compression/decompression process
  56. What is a video CODEC?
    a device or software that enables codec for digital video
  57. What is the major advatage of MPEG?
    files are much smaller for the same quality
  58. How do MPEGs work?
    by identifying and removing redundant information between successive images of the video
  59. What are MPEG-1s used for?
    Video CDs
  60. What are MPEG-4s used for?
    Internet streaming, Video on cell phones and Interactive TV
  61. What are the three kinds of encoded pictures for MPEG?
    I-pictures, P-pictures, B-pictures
  62. How many pictures are in 1 MPEG frame?
    12
  63. What is an I-picture?
    Intra-coded picture, which is a single compressed picture that contains all the spatial information of a video picture
  64. How are I-pictures encoded?
    as a single freestanding image, with no reference to preceding or subsequent pictures
  65. All the pictures before the next I-picture are called?
    Group of Pictures (GOP)
  66. What is a P-picture?
    Predictive pictures, which are computed pictures based on the nearest previous I- or P-picture
  67. How is the P-picture calculated?
    By comparing the previous and successive pictures and recording only the changes in the picture
  68. What do Bi-directional pictures do?
    use both past and subsequent pictures as references to calculate the compressed picture data
  69. This defines a cryptographic protocol for protecting audio/video entertainment content from illegal copying, interception and tampering
    Digital Transmission CONTENT Protection (DTCP)
  70. What does Digital Transmission CONTENT Protection (DTCP) do?
    defines a cryptographic protocol for protecting audio/video entertainment content from illegal copying, interception and tampering
  71. 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
  72. What is Conditional Access (CA)?
    the protection of content by requiring certain criteria to be met before granting access to this content
  73. What protects content by requiring certain criteria to be met before granting access to this content?
    Conditional Access (CA)
  74. What does copy protection do?
    gives content providers the security that their content is protected, but allows our customers to access it
  75. 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
  76. What does a Key System do?
    Allows a group of phone stations to access a common set of telephone lines
  77. What is the main use of a 110 punch down block?
    data applications and less interference
  78. What is the RJ21x used for?
    to interface between the eMTA and the 66 or 110 block demarcation point
  79. If the demarcation point is on the left side what is this refering to?
    a 66 or 110 punch down block
  80. What does a Video Modulator do?
    Places baseband signal onto a standard RF channel carrier
  81. What does a Video/Signal Processor do?
    modifies the signal for various reasons
  82. What does a multi-media switch do?
    switches high resolutin video and audio for commercial applications
  83. What does a Video Channel Filter do?
    eliminates unused channels and inserts local feeds
  84. What does a router do?
    connects the customer's internal network to the Internet
  85. What does a switch do?
    acts as a focal point in connecting multiple computers within one Local Area Network (LAN)
  86. 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
  87. What does a Network Patch Bay do?
    Connects building data wiring to an Ethernet switch
  88. What is the purpose of a 110 punch down block?
    for data usage and provide less interference
  89. 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
  90. What is fire barrier caulk and/or putty used for?
    to seal around the cable if a firewall must be penetrated
  91. What are elements that enhance the product and give it more usability?
    features
  92. What does digital compression do?
    separates successive pictures into two types of video information -- that which stays the same and that which changes
  93. What works by identifying and removing redundant information between successive images of the video?
    Moving Pictures Expert Group (MPEG)
  94. What is the first step that you should do when troubleshooting BCV, where the customer cannot dial out is:
    Verify dial tone and polarity
  95. What term describes an IP that can be SEEN ACROSS the internet?
    Public routable
  96. To provide good wireless coverage where some laptops may be outside:
    Place the Access Point (AP) near a window
  97. What is the range of an 802.11n wireless Access Point?
    UP TO 160'
  98. The range of an 802.11b thru g wireless Access Point is:
    25-150'
  99. 802.11g is compatible with: a, b, f, or only g devices?
    compatible with 802.11b
  100. Virus that triggers when a certain condition is met (SUCH AS A DATE) are said to be:
    event watching
  101. Virus that exploits SECURITY HOLES are:
    Worms
  102. The process of READDRESSING your packets with routable IPs is called:
    Network Address Translation (NAT)
  103. A virus that appears to be a normal program, but when run causes damage is a/an:
    Trojan
  104. The relationship between you and the customer is called:
    rapport
  105. How often should a champion meet with a coworker?
    If no "daily" answer then use as often as schedules permit
  106. When a champion provides feedback, it should be:
    a. timely and brutally honest
    b. honest yet tactful
    c written and oral
    d. documented in employees file
    B. Honest yet tactful
  107. The adult learning styles are?
    Visual, Auditory, tactile
  108. Which jack is used with the 8 line eMTA for phone lines?
    RJ21x
  109. Which malicious software uses an ADDRESS book to use to invade other computers?
    E-Mail virus
  110. Repeating what was just said in different words is:
    paraphrasing
  111. An IP address of 192.168.2.1 is:
    A. non-routable
    B. routable
    C. Reserved
    D. autoconfiguration
    A. non-routable
    (this multiple choice question has been scrambled)
  112. The 3 video encoded picture sequence for MPEG are:
    I-Picture, P-Picture, and B-picture or Bi-directional Picture
  113. The company Macro-vision is a company that offers what kind of services?
    Developing Analog Anti-copying and Piracy Technology (DACP)
  114. The main types of firewall rules are?
    Proxy, packet filtering, and stateful inspection
  115. How often should a champion meet with a worker?
    as often as possible
  116. What IPs are private non-routable?
    10.x.x.x, 172.16.x.x, 172.31.x.x, and 192.168.x.x
  117. What subnet mask would be used with a static IP of 70.123.16.75/29
    255.255.255.248
  118. What is the routable static IP of a BCI account with a Network IP of 70.23.47.87/30?
    70.23.47.88
  119. What is the Comcast tech log-in password for an IP gateway?
    D0nt4g3tme
  120. What is the process of REDISTRIBUTING your IPs into smaller groups called?
    subnetting
  121. What is the default log-in IP of a IP GATEWAY?
    10.1.10.1
  122. What subnet mask would indicate 13 static IPs?
    255.255.255.240
  123. What is the MULTIPAIR connector used in telephony for a 25pair cable?
    RJ21x
  124. What are the even numbered pins on the right side of a 66 block?
    Customer ring
  125. The IP address 169.254.x.x is called:
    Autoconfiguration
  126. The feature that distributes calls to multiple lines on BCV is:
    Hunt group
  127. When routing through a DROP CEILING, you should:
    suspend cables above the tiles
  128. 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
  129. What jack is used for a two line phone?
    RJ14
  130. What jack is used for a three line phone?
    RJ25
  131. What is the speed of a telco T1?
    1.54Mbps
  132. An IP address of 172.17.x.x is:
    non-routable
  133. Leading ghosts appear on what side of the picture?
    Right
  134. Following ghosts appear on what side of the picture?
    Left
  135. 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
  136. 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
  137. The main difference between MPEG and other Codecs is:
    MPEG files are much smaller than other Codec files for the same quality
  138. Beats generated in the cable system must be how much below the carrier level?
    57dB
  139. What interference is caused by the carrier from one channel operating in the space of another channel?
    co-channel
  140. What is co-channel?
    the interference is caused by the carrier from one channel operating in the space of another channel
  141. What is the power output of an 8line eMTA Local Power Supply Unit (LPSU)?
    48VDC/50Watts (60 Watts max)
  142. What is the expected noise inside of an amplifier (even without input signal)?
    -59.2dBmv
  143. What is the noise added to the input signal called?
    Amp's Noise Figure (NF)
  144. This device inserts a baseband signal onto a carrier
    Video Modulator
  145. What does a Video Modulator do?
    inserts a baseband signal onto a carrier
  146. What is the minimum processor speed for a new CHSI installation on Windows XP?
    300MHz
  147. What is the minimum hard drive space for a CHSI install on Mac OS 10.4?
    100MB
  148. What type of questioning requires you to acknowledge the customer intermittently during their talking?
    Passive listening
  149. A directional coupler is used in BCTV as a:
    Channel inserter
  150. What piece of equipment can be found between Comcast's modem and the customer's data patch panel?
    Router
  151. What are the 3 components of a fiber optic cable?
    Core, cladding, and coating
  152. What is the range of an 802.11n router?
    up to 160 feet
  153. What are the different types of routers?
    B, A, G, and N
  154. Which 802.11 router is NOT on a 2.4GHz frequency?
    A
  155. What are the four parts of viruses?
    Replication, event watching, camouflage and delivery
  156. 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
  157. 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
  158. What does a camouflage virus do?
    the virus replicates itself, it creates a different fake code to break up its identifying signature.
  159. Which virus replicates itself and creates a different fake code to break up its identifying signature?
    camouflage
  160. What are the main types of viruses?
    Executable, E-mail, worms, and trojan horse
  161. What virus scans the network for another machine that has a specific security hole?
    Worm
  162. 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
  163. What is the communications room?
    a room or dedicated location on the customer's premises that acts as a "hub" for various telecommunications services
  164. What is a room or dedicated location on the customer's premises that acts as a "hub" for various telecommunications services?
    Communications room
  165. What are the different types of ILEC connections?
    66 Block, NID, and screw term block
  166. What does the eMTA do?
    Enables operators to deliver 8 lines of telephony, tiered data and other advanced Internet Protocol (IP) services
  167. What is the difference between a 66 and 110 block?
    110 is for data and has less interference
  168. How much extra wire should be left around the mushroom spool?
    1-3 feet
  169. What is the standard interface for connecting multi-line telephone equipment?
    RJ21x
  170. 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
  171. What represents baseband AUDIO feed?
    Music on Hold
  172. What is the demarcation point?
    Point at which company wiring ends and the customer wiring begins
  173. What does a channel deletion filter and combiner do?
    deletes unused channels and inserts local feed
  174. Baseband VIDEO
    Video Modulator
  175. What does a video modulator do?
    Places baseband signal onto standard RF channel carrier
  176. What is the Domain Name Suffix (DNS)?
    abbreviation for the Internet service that locates and translates domain names into IP addresses
  177. What is a technique by which several hosts or computers share an IP Address for access to the Internet?
    Network Address Translation (NAT)
  178. 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
  179. How many IP addresses does a /30 subnet have?
    4
  180. What is the subnet mask for a /30 subnet?
    255.255.255.252
  181. How many static IPs for a /30 subnet?
    1
  182. How many static IPs for a /29 subnet?
    5
  183. How many static IPs for a /28 subnet?
    13
  184. What is the subnet mask for a /29 subnet?
    255.255.255.248
  185. What is the subnet mask for a /28 subnet?
    255.255.255.240
  186. How many IP addresses does a /29 subnet have?
    8
  187. How many IP addresses does a /28 subnet have?
    16
  188. 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)
  189. A group of computers geographically far apart, but are connected.
    Wide Area Network (WAN)
  190. Using a public network, this establishes a secure connection to an organization's private network
    Virtual Private Network (VPN)
  191. 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
  192. A portion of a network that shares a common address component.
    Subnet
  193. This forwards requests for a particular IP port pair to another IP port pair
    Port Address Translation (PAT)
  194. A system of computers, peripherals, terminals, and databases connected by communications lines
    Network
  195. 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)
  196. Software/hardware used to prevent unauthorized access from a computer system or network of computer systems
    Firewall
  197. What is the residential like product that we sell to customers for Internet?
    Business Class Internet (BCI)
  198. What is the residential like product that we sell to customers for phone?
    Business Class Voice (BCV)
  199. What techniques do you apply to ensure that the customer understands what services he/she ordered?
    customer education
  200. What is the last thing you do before leaving the customer's house?
    customer education
  201. What is the Point of Demarcation for Business Class Internet
    the business customer's LAN connection point on the IP gateway
  202. What port is used for HTTP or Web traffic?
    port 80
  203. What port is used for FTP traffic?
    port 20
  204. How do you access the features for comcast BCI?
    go to Team Comcast, click on Learning & Development and select CommCapsules
  205. Should you ever change the remote settings on a BCI install?
    No, always leave at default
  206. What is the format for a continuous ping?
    /ping(space)site(space)-t
  207. How do you get to "back up settings locally" with BCI?
    Configuration tools page, utility pull down menu
  208. What is used to assign Static IP addresses to Comcast Business Class Internet customers?
    Routing Information Protocol (RIP)
  209. What port is used for SMTP, POP and E-mail traffic?
    25
  210. What port is used for HTTPS, or secure traffic?
    443
  211. What does Port Blocking do?
    enables you to restrict specific local hosts from accessing particular Internet applications
  212. What enables you to restrict specific local hosts from accessing particular Internet applications?
    Port Blocking
  213. What is the difference between Port Forwarding and Port Triggering?
    Trigging is more secure but it runs slower
  214. 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
  215. 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)
  216. What area is used to tell BCI customer about all their features?
    feature manager
  217. What is the feature manager for?
    it tells Business Class Internet customers about all their features
  218. What star # is for activating call forward selective?
    *63
  219. What allows the customer to create list of people whose calls will be forwarded to a specific number?
    call forward selective
  220. What star # is for deactivating call forward selective?
    *83
  221. What star # is for activating call forward variable?
    *72
  222. What star # is for deactivating call forward variable?
    *73
  223. What star # is for deactivating "cancel call forwarding?"
    *70
  224. How do you activate "cancel call waiting?"
    press the flash button or the receiver button
  225. What star # is for activating speed dial 8?
    *74
  226. What is speed dial 8 used for?
    allows you to press 1 digit for the 8 most important phone numbers
  227. What star # is for activating speed dial 30?
    *75
  228. What is speed dial 30 used for?
    Allows you to press 2 digits for the 30 most important phone numbers
  229. What star # is for activating call hold?
    *52
  230. What star # is for activating anonymous call rejection?
    *77
  231. What star # is for deactivating anonymous call rejection?
    *87
  232. What star # is for activating call screening?
    *60
  233. What star # is for deactivating call screening?
    *80
  234. What star # is for activating caller ID blocking per call?
    *67
  235. What star # is for activating private numbering plan?
    2 + last 3 digits of number
  236. How do you activate a multi-line hunt group?
    the technician doesn't, it is set up by provisioning
  237. What star # is for activating terminal make busy (Do Not Disturb)?
    *230
  238. What star # is for deactivating terminal make busy (Do Not Disturb)?
    *231
  239. What star # is for activating call trace?
    *57
  240. What are the technician's roles for a BCI install?
    Site survey, and physical installation
  241. What does the site survey consist of?
    the technician confirming that the customer has the necessary infrastructure for the Business Class Voice
  242. What represents a line card error?
    Telephone light flashing slowly, about 1 per second.
  243. Telephone light flashing slowly, about 1 per second represents what?
    Line Card Error
  244. What star # is for activating group make busy (for multi-line hunt groups)?
    *232
  245. What star # is for deactivating group make busy (for multi-line hunt groups)?
    *233
  246. What would a data only line be used for?
    POS and fax
  247. Which of the following features is unique to BCV customers?
    A. anonymous call rejection
    B. call trace
    C. operator assistance
    D. remote activation of call forwarding
    D. remote activation of call forwarding
    (this multiple choice question has been scrambled)
  248. Which BCV installation step occurs first?
    A. verify dial tone on the eMTA
    B. disconnect previous phone provider
    C. label the voice line at the tap
    D. hook up a tone generator
    D. hook up a tone generator
    (this multiple choice question has been scrambled)
  249. What star # is for deactivating the different types of rings on a phone?
    *81
  250. What is the power measurement for an eMTA when plugged into an outlet?
    120VAC
  251. What is the power measurement for an eMTA when running off the battery?
    48VDC
  252. Where do Business Class Voice customers go to pay their bill?
    myebill.com
  253. What is the star # for directed call pickup with barge-in?
    *33
  254. What is the star # for flash call hold?
    hit the flash button, then press *22
  255. What is the star # for call pick up?
    *98
  256. What is the star # for directed call pickup?
    *97
  257. What is the star # for direct to voice mail?
    *55
  258. What is the star # for parking a call?
    hit the flash button, then *68
  259. What is the star # for retrieving a parked call?
    *88
  260. What does call pick up do?
    picks up a ringing call to any phone in a company
  261. What does directed call pickup do?
    this feature allows user to pick up a ringing call from a selected extension
  262. What does direct to voice mail do?
    this feature allows a user to transfer a call directly to user voicemail without the phone ringing
  263. 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
  264. A process that diverts and introduces a different signal for subsequent transmission in the same position:
    drop and insert
  265. Which Comcast Digital Cable service is NOT available to Business Class TV customers?
    Video On Demand
  266. What is the cable loss formula?
    (cable footage/100)/dB=cable loss
  267. How many MHz wide is 1 channel?
    6MHz
  268. How far from the channel edge is the video carrier?
    1.25MHz
  269. How far from channel video carrier is the sound carrier?
    4.5MHz
  270. How far from channel video carrier is color carrier?
    3.58MHz
  271. What are the signal leakage limits?
    64uV/m
  272. What is one of the two uV/ms to look for?
    15 microvolts per meter (uV/m) or greater at a distance of 30 meters (about 100 feet), at 5 to 54MHz and above 216MHz
  273. What is one of the two uV/ms to look for?
    20 microvolts per meter (uV/m) or greater at a distance of 3 meters (10feet), at 54 to 216 MHz
  274. What code title and part in FCC are the regulations for uV/m?
    Code of Fedral Regulations, Title 47, Telecommunication, Part 76.
  275. 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
  276. What side of the screen do leading ghosts appear on?
    Right
  277. What side of the screen do following ghosts appear on?
    Left
  278. Which Ghosts appear on the right side of the screen?
    Leading Ghosts
  279. Which Ghosts appear on the left side of the screen?
    Following Ghost
  280. What type of ghosts are usually caused by signal reflection?
    Following Ghost
  281. What type of ghosts are usually caused by direct pick up (off-air signal getting into the cable system)?
    Leading Ghost
  282. What is caused in one channel by the carrier from another transmitter operating on the same channel?
    Co-Channel Interference
  283. Where is the majority of ingress entering the system?
    Majority of ingress is usually between the tap and the customer's TV set.
  284. 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
  285. 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)
  286. 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
  287. What is Cumulative Leakage Index/Indicator (CLI)?
    a mathematical value derived from the number and severity of leaks in the cable system
  288. a mathematical value derived from the number and severity of leaks in the cable system
    Cumulative Leakage Index/Indicator (CLI)
  289. How long must leakage logs be kept on file?
    at least 2yrs
  290. What is the maximum Federal Communication Commission (FCC) limit of leakage allowed?
    must be 64uV/m or less
  291. 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
  292. What is the voltage on hook?
    -48VDC +/- 2
  293. What is the voltage off hook?
    -6.5VDC +/- 2
  294. What is the difference between on and off hook voltage?
    42 Volts +/-2
  295. How does Cross Modulation (XMOD) usually manifest itself?
    as a VERTICAL bar
  296. What does the "tree and branch" analogy refer to?
    Coaxial cable with 30, 40, 60 or even greater cascade of amps
  297. What is a combination of optics and RF that now replace Coaxial cable?
    Hybrid Fiber Coax (HFC)
  298. 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
  299. What is the primary source of hum modulation today?
    the power passing chokes used in passive devices; splitters, etc
  300. What is a phase modulation algorithm that a digital modulation scheme might shift a carrier in 90-degree steps?
    Quadrature Phase Shift Keying (QPSK)
  301. 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)
  302. What is a measure of signal strength relative to background noise in analog and digital communications?
    Signal-to-noise ratio (SNR)
  303. What measures activity levels in the unused portion of a multi-channel system when there is random activity in the active channels?
    Noise Power Ratio (NPR)
  304. 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
  305. What is a useful measurement for early detection of non-transient (noise) impairments?
    Modulation Error Rate (MER)
  306. What is a useful measurement for detection of transient impairments?
    Bit Error Rate (BER)
  307. What measures how often an error occurs in a given amount of data?
    Bit Error Rate (BER)
  308. What is useful for measuring long term system performance and periodic transient impairments?
    Bit Error Rate (BER)
  309. 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)
  310. 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
  311. What enters a Community Antenna TeleVision (CATV) system through damaged or otherwise improperly shielded coax cable or related components?
    Ingress
  312. What type of filter passes high frequencies well, but attenuates (or reduces) frequencies lower than the cut-off frequency?
    High Pass Filters
  313. 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
  314. 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
  315. What is the first step in troubleshooting when you get to a video service call?
    Begin at the TV
  316. What has the ability to carry and individually select different channels on a single cable by their unique FREQUENCY?
    Frequency division multiplexing (FDM)
  317. Which of these appliances does NOT interfere with the return path to create ingress?
    A. Air conditioners
    B. Refrigerators
    C. Microwaves
    d. All of the above
    C. Microwaves
    (this multiple choice question has been scrambled)
  318. What is the term for RF signal entering the CATV system?
    ingress
  319. What is the term for RF signal leaking OUT of the system?
    egress
  320. What separates OR combines the AC power and the RF broadband signals?
    Power Diplex
  321. What separates (AND recombines) the forward and reverse signals?
    Diplex Filter
  322. What is usually selected to produce "FLAT" broadband signals to the INPUT of the first stage of amplification?
    Input Equalizer
  323. What determines the station's OUTPUT tilt?
    Interstage Equalizer
  324. What is used to compensate for the fluctuations of the INPUT signal?
    Automatic Gain Control (AGC)
  325. What maintains the proper tilt and OUTPUT levels?
    Automatic Level and Slope Control (ALS)
  326. What converts the lower level "trunk" signals to a higher output that can be used for distribution?
    Bridger Amplifier
  327. What is a signal splitting device that plugs into a trunk/bridger chassis?
    Feedermaker
  328. Do minibridgers contain a feedermaker?
    No
  329. What is the isolation amount for signal paths between the tap and output port on a directional coupler?
    25dB or greater
  330. What acts as a combiner with signals that flow in the opposite direction, such as return?
    splitters
  331. AC flow is determined by the placement of fuses or shunts in the ___________?
    splitter
  332. Is the number on the tap added or subtracted from your meter when taking levels?
    subtracted
  333. What is used to introduce AC power into the network for use by the active devices?
    Power Inserter
  334. 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
  335. What converts the incoming light to RF signals?
    Optical Receiver
  336. What does the structure of Comcast National Architecture Layers NOT consist of?
    A. Radio Frequency distribution system
    B. Converged Regional Area Network
    C. Converged Backbone
    D. Internet Backbone
    A. Radio Frequency Distribution System
    (this multiple choice question has been scrambled)
  337. 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
  338. A strand map includes all BUT the following:
    A. span lengths
    B. streets
    C. amps
    D. poles
    C. amps
    (this multiple choice question has been scrambled)