Progression Construction Coordinator I – II: Questions
Answered With Expert Insight
Monitoring the status of optical nodes Correct Answer - Involves the use of
a node transponder that continuously monitors a number of critical functions.
Digital return path transmissions Correct Answer - Use DWDM
Dense wavelength division multiplexing
digital return transmitters in hub-to-headend architectures.
Broadband cable operators provide customers with HSD High-speed data
connections to the Internet via their HFC networks using what standard?
Correct Answer - DOCSIS
What is MPEG? Correct Answer - A universally accepted standard for
digital television, first released in 1992.
Which of the following is true about optical nodes? Correct Answer - They
contain four main sections: the optical receiver, the RF amplifier module, the
reverse optical transmitter, and the DC power supply.
What product based on the DOCSIS defines the protocols for IP telephony over
HFC? Correct Answer - PacketCable
In a centralized server VOD architecture, Correct Answer - The number of
servers needed for video content storage is smaller than in the distributed
server architecture.
Which of the following statements about local ad insertion is true? Correct
Answer - Local ad insertion is performed usually by a video server.
In regard to providing HSD service, Correct Answer - The CMTS
Cable modem termination system
can provide a data transfer rate up to 38 Mbps, using 256-QAM in a single 6
MHz channel.
Which of the following is true about the SONET standard? Correct Answer -
SONET is the North American standard used for telephony applications.
,Compared to a solid copper center conductor, which property about a copper
clad aluminum (CCA) center conductor is correct? Correct Answer - The
CCA center conductor has almost equal attenuation at high frequencies.
In hardline coaxial cable, what is the most common dielectric material?
Correct Answer - Foamed polyethylene produced by gas injection.
In aerial installations, why do cable manufacturers recommend that expansion
loops be formed in hardline coaxial cable? Correct Answer - To allow
movement of the cable when lashed to the strand
Why was the impedance for the broadband cable industry standardized at 75
ohms (Ω)? Correct Answer - At 75 Ω characteristic impedance, the coaxial
cable has minimal attenuation, with adequate breakdown voltage and power
carrying capacity.
What is the coaxial cable velocity of propagation (VoP)? Correct Answer -
The rate that radio frequency (RF) signals travel through the coaxial cable
versus the speed that RF signals travel in a vacuum or free space.
If the attenuation through a 100 ft. span of 0.750 MC2 coaxial cable is 2.5dB at
75 MHz, what will be the approximate attenuation at 300 MHz? Correct
Answer - 2 x 2.5 dB, or 5.0 dB.
What is the attenuation through 1,600-feet of 0.750 cable at 600 MHz and
120° F, when at 68° F and 600 MHz the cable attenuation rate is 1.31 decibels
(dB)/100 feet? (Be sure to factor in the higher temperature.) Correct
Answer - 22.05 dB.
What happens when there is an impedance mismatch between the coaxial
cable and the load? Correct Answer - Some signal energy is transferred to
the load, with the remainder reflected along the coaxial cable back to the
source.
What is the return loss in coaxial cable? Correct Answer - The difference in
decibels (dB) between the signal power applied to a terminated cable and the
reflected signal power.
, How can signal leaks (egress) from hardline coaxial cable occur? Correct
Answer - Through cracks in the shield where the cable is bent, or tiny holes
in the shield.
Why are pin-type hardline connectors the preferred type of connector for
attaching hardline coaxial cable to equipment housings in today's networks?
Correct Answer - Over the years, intermittent operation, low-frequency roll-
off, and common path distortion (CPD) issues have been attributed to feed-
through connectors.
What type of adapter is used for permanent or temporary jumper installation
in place of damaged hardline coaxial cable or equipment hookup? Correct
Answer - Pin-to-F female adapters.
What should be worn when cutting and preparing hardline coaxial cable for
connector attachment? Correct Answer - Leather work gloves.
How should a knife be used when preparing hardline coaxial cable for
connector attachment? Correct Answer - To carefully cut the dielectric
away before coring the cable.
What is a consequence of cutting hardline coaxial cable with conventional side
cutters? Correct Answer - The end of the cable is crushed and deformed,
which makes coring the dielectric and sliding connector parts onto the cable
difficult.
When using a single-purpose coring tool, what is done before the coring tool
can be used to cut and remove the dielectric? Correct Answer - The
appropriate length of aluminum shield and dielectric must be removed, to
expose the cable center conductor.
If the hardline coaxial cable center conductor is too short after coring the
dielectric with a combination coring tool, what should be done? Correct
Answer - Clean out any dielectric and aluminum trimmings from the cable
and the tool and continue coring to the correct depth.
What is different about preparing QR hardline coaxial cable for connector
installation compared to all other types? Correct Answer - QR cable is first
Answered With Expert Insight
Monitoring the status of optical nodes Correct Answer - Involves the use of
a node transponder that continuously monitors a number of critical functions.
Digital return path transmissions Correct Answer - Use DWDM
Dense wavelength division multiplexing
digital return transmitters in hub-to-headend architectures.
Broadband cable operators provide customers with HSD High-speed data
connections to the Internet via their HFC networks using what standard?
Correct Answer - DOCSIS
What is MPEG? Correct Answer - A universally accepted standard for
digital television, first released in 1992.
Which of the following is true about optical nodes? Correct Answer - They
contain four main sections: the optical receiver, the RF amplifier module, the
reverse optical transmitter, and the DC power supply.
What product based on the DOCSIS defines the protocols for IP telephony over
HFC? Correct Answer - PacketCable
In a centralized server VOD architecture, Correct Answer - The number of
servers needed for video content storage is smaller than in the distributed
server architecture.
Which of the following statements about local ad insertion is true? Correct
Answer - Local ad insertion is performed usually by a video server.
In regard to providing HSD service, Correct Answer - The CMTS
Cable modem termination system
can provide a data transfer rate up to 38 Mbps, using 256-QAM in a single 6
MHz channel.
Which of the following is true about the SONET standard? Correct Answer -
SONET is the North American standard used for telephony applications.
,Compared to a solid copper center conductor, which property about a copper
clad aluminum (CCA) center conductor is correct? Correct Answer - The
CCA center conductor has almost equal attenuation at high frequencies.
In hardline coaxial cable, what is the most common dielectric material?
Correct Answer - Foamed polyethylene produced by gas injection.
In aerial installations, why do cable manufacturers recommend that expansion
loops be formed in hardline coaxial cable? Correct Answer - To allow
movement of the cable when lashed to the strand
Why was the impedance for the broadband cable industry standardized at 75
ohms (Ω)? Correct Answer - At 75 Ω characteristic impedance, the coaxial
cable has minimal attenuation, with adequate breakdown voltage and power
carrying capacity.
What is the coaxial cable velocity of propagation (VoP)? Correct Answer -
The rate that radio frequency (RF) signals travel through the coaxial cable
versus the speed that RF signals travel in a vacuum or free space.
If the attenuation through a 100 ft. span of 0.750 MC2 coaxial cable is 2.5dB at
75 MHz, what will be the approximate attenuation at 300 MHz? Correct
Answer - 2 x 2.5 dB, or 5.0 dB.
What is the attenuation through 1,600-feet of 0.750 cable at 600 MHz and
120° F, when at 68° F and 600 MHz the cable attenuation rate is 1.31 decibels
(dB)/100 feet? (Be sure to factor in the higher temperature.) Correct
Answer - 22.05 dB.
What happens when there is an impedance mismatch between the coaxial
cable and the load? Correct Answer - Some signal energy is transferred to
the load, with the remainder reflected along the coaxial cable back to the
source.
What is the return loss in coaxial cable? Correct Answer - The difference in
decibels (dB) between the signal power applied to a terminated cable and the
reflected signal power.
, How can signal leaks (egress) from hardline coaxial cable occur? Correct
Answer - Through cracks in the shield where the cable is bent, or tiny holes
in the shield.
Why are pin-type hardline connectors the preferred type of connector for
attaching hardline coaxial cable to equipment housings in today's networks?
Correct Answer - Over the years, intermittent operation, low-frequency roll-
off, and common path distortion (CPD) issues have been attributed to feed-
through connectors.
What type of adapter is used for permanent or temporary jumper installation
in place of damaged hardline coaxial cable or equipment hookup? Correct
Answer - Pin-to-F female adapters.
What should be worn when cutting and preparing hardline coaxial cable for
connector attachment? Correct Answer - Leather work gloves.
How should a knife be used when preparing hardline coaxial cable for
connector attachment? Correct Answer - To carefully cut the dielectric
away before coring the cable.
What is a consequence of cutting hardline coaxial cable with conventional side
cutters? Correct Answer - The end of the cable is crushed and deformed,
which makes coring the dielectric and sliding connector parts onto the cable
difficult.
When using a single-purpose coring tool, what is done before the coring tool
can be used to cut and remove the dielectric? Correct Answer - The
appropriate length of aluminum shield and dielectric must be removed, to
expose the cable center conductor.
If the hardline coaxial cable center conductor is too short after coring the
dielectric with a combination coring tool, what should be done? Correct
Answer - Clean out any dielectric and aluminum trimmings from the cable
and the tool and continue coring to the correct depth.
What is different about preparing QR hardline coaxial cable for connector
installation compared to all other types? Correct Answer - QR cable is first
