Progression: Construction Coordinator I - II
Exam Questions |Already Answered | Graded
A+
Monitoring the status of optical nodes - ANSWER-Involves the use of a node transponder that
continuously monitors a number of critical functions.
Digital return path transmissions - 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? - ANSWER-DOCSIS
What is MPEG? - ANSWER-A universally accepted standard for digital television, first released in 1992.
Which of the following is true about optical nodes? - 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? - ANSWER-
PacketCable
In a centralized server VOD architecture, - 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? - ANSWER-Local ad insertion is
performed usually by a video server.
In regard to providing HSD service, - 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? - 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? - ANSWER-The CCA center conductor has almost equal attenuation at high
frequencies.
In hardline coaxial cable, what is the most common dielectric material? - ANSWER-Foamed polyethylene
produced by gas injection.
In aerial installations, why do cable manufacturers recommend that expansion loops be formed in
hardline coaxial cable? - 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)? - 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)? - 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? - 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.) - ANSWER-22.05 dB.
What happens when there is an impedance mismatch between the coaxial cable and the load? -
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? - ANSWER-The difference in decibels (dB) between the signal
power applied to a terminated cable and the reflected signal power.
Exam Questions |Already Answered | Graded
A+
Monitoring the status of optical nodes - ANSWER-Involves the use of a node transponder that
continuously monitors a number of critical functions.
Digital return path transmissions - 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? - ANSWER-DOCSIS
What is MPEG? - ANSWER-A universally accepted standard for digital television, first released in 1992.
Which of the following is true about optical nodes? - 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? - ANSWER-
PacketCable
In a centralized server VOD architecture, - 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? - ANSWER-Local ad insertion is
performed usually by a video server.
In regard to providing HSD service, - 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? - 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? - ANSWER-The CCA center conductor has almost equal attenuation at high
frequencies.
In hardline coaxial cable, what is the most common dielectric material? - ANSWER-Foamed polyethylene
produced by gas injection.
In aerial installations, why do cable manufacturers recommend that expansion loops be formed in
hardline coaxial cable? - 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)? - 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)? - 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? - 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.) - ANSWER-22.05 dB.
What happens when there is an impedance mismatch between the coaxial cable and the load? -
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? - ANSWER-The difference in decibels (dB) between the signal
power applied to a terminated cable and the reflected signal power.
