broadband digital installer exam
questions with completed answers…
What information is typically stored in a signal level meter's (SLM) channel plan? -
Answer The SLM channel plan typically includes the channel number, center
frequency, channel bandwidth, modulation type, and symbol rate.
What advantages are there to performing automated measurements with an SLM? -
Answer Automated measurements help ensure consistent measurement practices
among different technicians.
What parameters of the RF carrier should be measured when diagnosing or
qualifying a digital TV (DTV) service? - Answer To diagnose or qualify a DTV
service, measurements such as power levels, modulation error ratio (MER), bit error
rate (BER), etc. should be taken using a digital signal analyzer.
When connected directly to the broadband cable network, what must be done to the
digital television set for it determine each channel's modulation and encoding
scheme? - Answer When connected directly to the broadband cable network, the
DTV must be instructed to "scan" all of the incoming channels and store each
channel's modulation and encoding scheme into memory.
Which customers were originally targeted to use digital terminal adapters (DTA)? -
Answer The DTA was originally targeted to those customers with analog TVs that
subscribed to basic-only service.
What technology enables individual digital set-top boxes (STB) to receive
authorization to access-encrypted program content via a subscriber management
system (SMS), aka billing system? - Answer Addressable technology enables
individual digital STBs to receive authorization to access-encrypted program content
via an SMS.
What device is being deployed as the next evolutionary step for the STB? - Answer
The cable gateway is being deployed as the next evolutionary step for the STB.
What was a practical limitation of the integrated entertainment system cabinet? -
Answer The size of the picture tube was limited to what could be installed in the
integrated entertainment system cabinet.
Why did the digital versatile disc (DVD) player/recorder replace the videocassette
recorder (VCR) in many entertainment systems? - Answer The VCR was replaced in
many entertainment systems because of the DVD's compact size, excellent video
and audio quality, and the player's ease of use.
What could happen if system components are stacked on top of processor-intensive
components such as a set-top box (STB)? - Answer Stacking components on top of
processor-intensive components such as an STB can restrict the air flow that
dissipates heat, which can cause the STB to malfunction or fail.
,broadband digital installer exam
questions with completed answers…
What functionality has been added to many signal level meters (SLM) to measure
specific parameters of a digital modulation carrier containing digital television and
DOCSIS signals? - Answer Digital signal analyzer functionality
What is a risk of performing automated measurements on a sample of channels,
instead of all channels? - Answer Problems in unmeasured channels may go
undetected
Using a digital signal analyzer, what measurements are typically taken to
troubleshoot and diagnose a digital television signal? - Answer Carrier average
power level, modulations error ratio and bit error rate
How do cable operators ensure that only paying customers are receiving digital
television service? - Answer Cable operators prevent unauthorized reception of DTV
services by scrambling or encrypting the services.
When would a DTA be installed in the customer premises? - Answer When the
customer subscribes to basic-only services
What determines how many days TV program schedules can be stored on a digital
set-top box? - Answer The amount of available STB memory, the number of program
channels and how often the carousel server delivers new information.
A cable gateway can replace which broadband cable operator supplied devices? -
Answer The cable gateway could replace a cable modem and digital set-top box
What forced customers to choose between the integrated entertainment system
furniture cabinet and upgraded system components? - Answer Advances in
technology, such as color television, upgraded turntables, etc.
What functionality do many Blu-Ray players have, besides playing back discs? -
Answer Many Blu-ray players have built in media streaming capabilities through a
wired or wireless network connection.
Entertainment cabinets with doors made of green glass, block what? - Answer
Infrared (IR) remote sensors
In addition to being an equipment standard, what other recommendations are
included in the Data Over Cable Service Interface Specification (DOCSIS)? - Answer
In addition to being an equipment standard, DOCSIS includes recommended
parameters for HFC network performance. If the network meets or exceeds these
recommendations, operators can expect reliable data transmission
What are the main components of the DOCSIS architecture? - Answer The main
components of the DOCSIS architecture are the cable modem and the cable modem
termination system (CMTS).
, broadband digital installer exam
questions with completed answers…
What criteria must a cable modem meet to be certified as a DOCSIS modem? -
Answer To be certified as a DOCSIS modem, verification of compliance with
DOCSIS standards and the ability to interoperate with other certified DOCSIS
modems must be met.
Which layers of the seven-layer Open Systems Interconnection (OSI) reference
model are present in the DOCSIS implementation? - Answer Within the DOCSIS
implementation of the OSI model, layers one through four are specific to cable
networks and are present only between the cable modem and the CMTS.
Which broadband cable architecture type was the first Data Over Cable Service
Interface Specification (DOCSIS) designed to operate? - Answer DOCSIS 1.0 was
designed to operate on legacy tree-and-branch and hybrid fiber/coax (HFC)
architectures.
What was added to DOCSIS 1.1 to support PacketCable, an IP-based platform for
telephone service, over a DOCSIS access network? - Answer DOCSIS 1.1 added
quality of service (QoS) controls, enhanced security, and adaptive equalization in the
upstream path for improved data throughput to meet the requirements of
PacketCable.
What two enhanced communications access technologies were introduced in
DOCSIS 2.0 to support wider bandwidth upstream carriers and higher orders of
modulation? - Answer Advanced time division multiple access (A-TDMA) and
synchronous code division multiple access (S-CDMA) were introduced in DOCSIS
2.0 to support wider bandwidth upstream carriers and higher orders of modulation.
What is a feature that was included in DOCSIS 3.0 other than channel bonding? -
Answer In addition to channel bonding, DOCSIS 3.0 was designed to support IPv4
and IPv6 and an orderly transition from IPv4 to IPv6.
What is introduced in DOCSIS 3.1 to increase data throughput? - Answer To
increase data throughput, DOCSIS 3.1 uses orthogonal frequency division
multiplexing (OFDM) and low-density parity-check (LDCP).
What feature was introduced in DOCSIS 1.1 that enabled the setting of defined
levels of service so that minimum throughput data rates could be guaranteed? -
Answer Quality of service (QoS) protocols introduced in DOCSIS 1.1 enabled the
setting of defined levels of service so that minimum throughput data rates could be
guaranteed.
What is the upstream frequency bandwidth if four DOCSIS 3.0 carriers of maximum
bandwidth are bonded? - Answer In DOCSIS 3.0, if up to four 6.4 MHz wide
upstream carriers are bonded, the upstream frequency bandwidth is 25.6 MHz.
How can delays caused by low upstream data throughput delay the delivery of data
in the downstream? - Answer If reception of the application's acknowledgement is
questions with completed answers…
What information is typically stored in a signal level meter's (SLM) channel plan? -
Answer The SLM channel plan typically includes the channel number, center
frequency, channel bandwidth, modulation type, and symbol rate.
What advantages are there to performing automated measurements with an SLM? -
Answer Automated measurements help ensure consistent measurement practices
among different technicians.
What parameters of the RF carrier should be measured when diagnosing or
qualifying a digital TV (DTV) service? - Answer To diagnose or qualify a DTV
service, measurements such as power levels, modulation error ratio (MER), bit error
rate (BER), etc. should be taken using a digital signal analyzer.
When connected directly to the broadband cable network, what must be done to the
digital television set for it determine each channel's modulation and encoding
scheme? - Answer When connected directly to the broadband cable network, the
DTV must be instructed to "scan" all of the incoming channels and store each
channel's modulation and encoding scheme into memory.
Which customers were originally targeted to use digital terminal adapters (DTA)? -
Answer The DTA was originally targeted to those customers with analog TVs that
subscribed to basic-only service.
What technology enables individual digital set-top boxes (STB) to receive
authorization to access-encrypted program content via a subscriber management
system (SMS), aka billing system? - Answer Addressable technology enables
individual digital STBs to receive authorization to access-encrypted program content
via an SMS.
What device is being deployed as the next evolutionary step for the STB? - Answer
The cable gateway is being deployed as the next evolutionary step for the STB.
What was a practical limitation of the integrated entertainment system cabinet? -
Answer The size of the picture tube was limited to what could be installed in the
integrated entertainment system cabinet.
Why did the digital versatile disc (DVD) player/recorder replace the videocassette
recorder (VCR) in many entertainment systems? - Answer The VCR was replaced in
many entertainment systems because of the DVD's compact size, excellent video
and audio quality, and the player's ease of use.
What could happen if system components are stacked on top of processor-intensive
components such as a set-top box (STB)? - Answer Stacking components on top of
processor-intensive components such as an STB can restrict the air flow that
dissipates heat, which can cause the STB to malfunction or fail.
,broadband digital installer exam
questions with completed answers…
What functionality has been added to many signal level meters (SLM) to measure
specific parameters of a digital modulation carrier containing digital television and
DOCSIS signals? - Answer Digital signal analyzer functionality
What is a risk of performing automated measurements on a sample of channels,
instead of all channels? - Answer Problems in unmeasured channels may go
undetected
Using a digital signal analyzer, what measurements are typically taken to
troubleshoot and diagnose a digital television signal? - Answer Carrier average
power level, modulations error ratio and bit error rate
How do cable operators ensure that only paying customers are receiving digital
television service? - Answer Cable operators prevent unauthorized reception of DTV
services by scrambling or encrypting the services.
When would a DTA be installed in the customer premises? - Answer When the
customer subscribes to basic-only services
What determines how many days TV program schedules can be stored on a digital
set-top box? - Answer The amount of available STB memory, the number of program
channels and how often the carousel server delivers new information.
A cable gateway can replace which broadband cable operator supplied devices? -
Answer The cable gateway could replace a cable modem and digital set-top box
What forced customers to choose between the integrated entertainment system
furniture cabinet and upgraded system components? - Answer Advances in
technology, such as color television, upgraded turntables, etc.
What functionality do many Blu-Ray players have, besides playing back discs? -
Answer Many Blu-ray players have built in media streaming capabilities through a
wired or wireless network connection.
Entertainment cabinets with doors made of green glass, block what? - Answer
Infrared (IR) remote sensors
In addition to being an equipment standard, what other recommendations are
included in the Data Over Cable Service Interface Specification (DOCSIS)? - Answer
In addition to being an equipment standard, DOCSIS includes recommended
parameters for HFC network performance. If the network meets or exceeds these
recommendations, operators can expect reliable data transmission
What are the main components of the DOCSIS architecture? - Answer The main
components of the DOCSIS architecture are the cable modem and the cable modem
termination system (CMTS).
, broadband digital installer exam
questions with completed answers…
What criteria must a cable modem meet to be certified as a DOCSIS modem? -
Answer To be certified as a DOCSIS modem, verification of compliance with
DOCSIS standards and the ability to interoperate with other certified DOCSIS
modems must be met.
Which layers of the seven-layer Open Systems Interconnection (OSI) reference
model are present in the DOCSIS implementation? - Answer Within the DOCSIS
implementation of the OSI model, layers one through four are specific to cable
networks and are present only between the cable modem and the CMTS.
Which broadband cable architecture type was the first Data Over Cable Service
Interface Specification (DOCSIS) designed to operate? - Answer DOCSIS 1.0 was
designed to operate on legacy tree-and-branch and hybrid fiber/coax (HFC)
architectures.
What was added to DOCSIS 1.1 to support PacketCable, an IP-based platform for
telephone service, over a DOCSIS access network? - Answer DOCSIS 1.1 added
quality of service (QoS) controls, enhanced security, and adaptive equalization in the
upstream path for improved data throughput to meet the requirements of
PacketCable.
What two enhanced communications access technologies were introduced in
DOCSIS 2.0 to support wider bandwidth upstream carriers and higher orders of
modulation? - Answer Advanced time division multiple access (A-TDMA) and
synchronous code division multiple access (S-CDMA) were introduced in DOCSIS
2.0 to support wider bandwidth upstream carriers and higher orders of modulation.
What is a feature that was included in DOCSIS 3.0 other than channel bonding? -
Answer In addition to channel bonding, DOCSIS 3.0 was designed to support IPv4
and IPv6 and an orderly transition from IPv4 to IPv6.
What is introduced in DOCSIS 3.1 to increase data throughput? - Answer To
increase data throughput, DOCSIS 3.1 uses orthogonal frequency division
multiplexing (OFDM) and low-density parity-check (LDCP).
What feature was introduced in DOCSIS 1.1 that enabled the setting of defined
levels of service so that minimum throughput data rates could be guaranteed? -
Answer Quality of service (QoS) protocols introduced in DOCSIS 1.1 enabled the
setting of defined levels of service so that minimum throughput data rates could be
guaranteed.
What is the upstream frequency bandwidth if four DOCSIS 3.0 carriers of maximum
bandwidth are bonded? - Answer In DOCSIS 3.0, if up to four 6.4 MHz wide
upstream carriers are bonded, the upstream frequency bandwidth is 25.6 MHz.
How can delays caused by low upstream data throughput delay the delivery of data
in the downstream? - Answer If reception of the application's acknowledgement is
