Cable Network Overview Quiz 2023 Graded A+
What are the six methods in which signals arrive at a cable system?
A. Over-the-air
B. Terrestrial microwave
C. Direct cable feed
D. Satellites
E. Locally produced
F. Public switched telephone network
The signals used in broadband cable networks are part of the greater
electromagnetic spectrum. What signals are included in the electromagnetic
spectrum?
A. Radio frequencies (RF)
B. Television
C. Microwave
D. Infared
E. Visible Light
F. X-rays
G. Gamma rays
H. Cosmic rays
What is the analog signal?
composed of three parts: video, color, and audio and are converted to a specific
channel frequency for transport through the cable network.
Describe the basic function of a headend.
takes all incoming signals and first processes them in some way, and then combines
them to form a composite broadband RF signal that is sent out through the cable
system.
How does expanded basic differ from basic services?
includes a number of additional nonpremium, satellite-delivered channels for a separate
monthly fee.
How is digital voice service made available?
made available by connecting a multimedia terminal adaptor (MTA) to the cable modem
or more often with an embedded multimedia terminal adaptor (EMTA) that integrates
the cable modem and MTA in a single device.
CMTS
Cable Modem Termination System
PSTN
Public Switched Telephone Network
Qos
Quality of Service
Which cable system department is typically responsible for maintaining
communication with field personnel (i.e., installers and service technicians) and
the customer service department?
DISPATCH
What two departments work together to ensure bills are accurately and efficiently
sent to customers?
, Customer service and data processing
Through what equipment does a signal pass in the downstream path in the tree-
and -branch architecture?
begins at the headend and is transmitted through trunk coax and amplifiers. Several
trunk cable runs each contain a number of amplifiers spliced into the cables. Line
splitters and directional couplers route some of the signal onto additional trunk runs.
What is the role of amplifiers?
boost the power of a signal, which has lost some of its strength while traveling through
the trunk cables and other passive devices.
How do HFC networks divide the broadband cable operator's coverage area?
divides the broadband cable operator's coverage area into small "serving areas" of 150
to 2,500 customers. Each serving area contains an optical node connected to the
headend or remote hub site by its own dedicated fiber cable.
How is the RF signal converted and transmitted in an HFC architecture?
he RF signal is converted into light at the headend. The light is transmitted by laser over
fibers until reaching optical receivers in the nodes. The light signal is then converted
back into RF, amplified and sent through the coaxial feeder to the drop.
HFC
Hybrid-Fiber-Coax
On the upstream path, what happens to RF signals at the node?
F signals enter the node and are converted into light. A return laser sends the light
signal to the headend.
What is the benefit of replacing coax with fiber?
the HFC architecture reduces the number of amplifiers required to transport the signal
to the feeder. Because of this reduction, the network is more reliable and provides
better voice, video, and data signal quality. An HFC system provides a more efficient
upstream path because separate fibers are used.
What are the basic components of coax (from the inside out)?
(1) the center conductor; (2) dielectric; (3) solid aluminum sheath or outer conductor; (4)
armor (if used); (5) jacket (if used); and (6) messenger (if used).
What can the center conductor be made of?
solid copper or aluminum with a copper cladding (or coating).
What is the role of the dielectric?
supports the center conductor while providing insulation between the center conductor
and aluminum sheath.
What are the functions of the sheath?
encloses the signals and prevents ingress and egress. It also provides structural
support, return (ground) for AC current, and a constant impedance (total opposition to
flow of electrical current) across the entire length of the coax.
To operate, what do active devices require?
electrical power
How is unity gain maintained in amplifiers?
If loss in the coaxial cable is different from the amplifier's gain, input attenuators and
equalizers adjust the loss so that the gain remains the same and the signal level at the
amplifier output is equal across the network.
What does a trunk station contain?
What are the six methods in which signals arrive at a cable system?
A. Over-the-air
B. Terrestrial microwave
C. Direct cable feed
D. Satellites
E. Locally produced
F. Public switched telephone network
The signals used in broadband cable networks are part of the greater
electromagnetic spectrum. What signals are included in the electromagnetic
spectrum?
A. Radio frequencies (RF)
B. Television
C. Microwave
D. Infared
E. Visible Light
F. X-rays
G. Gamma rays
H. Cosmic rays
What is the analog signal?
composed of three parts: video, color, and audio and are converted to a specific
channel frequency for transport through the cable network.
Describe the basic function of a headend.
takes all incoming signals and first processes them in some way, and then combines
them to form a composite broadband RF signal that is sent out through the cable
system.
How does expanded basic differ from basic services?
includes a number of additional nonpremium, satellite-delivered channels for a separate
monthly fee.
How is digital voice service made available?
made available by connecting a multimedia terminal adaptor (MTA) to the cable modem
or more often with an embedded multimedia terminal adaptor (EMTA) that integrates
the cable modem and MTA in a single device.
CMTS
Cable Modem Termination System
PSTN
Public Switched Telephone Network
Qos
Quality of Service
Which cable system department is typically responsible for maintaining
communication with field personnel (i.e., installers and service technicians) and
the customer service department?
DISPATCH
What two departments work together to ensure bills are accurately and efficiently
sent to customers?
, Customer service and data processing
Through what equipment does a signal pass in the downstream path in the tree-
and -branch architecture?
begins at the headend and is transmitted through trunk coax and amplifiers. Several
trunk cable runs each contain a number of amplifiers spliced into the cables. Line
splitters and directional couplers route some of the signal onto additional trunk runs.
What is the role of amplifiers?
boost the power of a signal, which has lost some of its strength while traveling through
the trunk cables and other passive devices.
How do HFC networks divide the broadband cable operator's coverage area?
divides the broadband cable operator's coverage area into small "serving areas" of 150
to 2,500 customers. Each serving area contains an optical node connected to the
headend or remote hub site by its own dedicated fiber cable.
How is the RF signal converted and transmitted in an HFC architecture?
he RF signal is converted into light at the headend. The light is transmitted by laser over
fibers until reaching optical receivers in the nodes. The light signal is then converted
back into RF, amplified and sent through the coaxial feeder to the drop.
HFC
Hybrid-Fiber-Coax
On the upstream path, what happens to RF signals at the node?
F signals enter the node and are converted into light. A return laser sends the light
signal to the headend.
What is the benefit of replacing coax with fiber?
the HFC architecture reduces the number of amplifiers required to transport the signal
to the feeder. Because of this reduction, the network is more reliable and provides
better voice, video, and data signal quality. An HFC system provides a more efficient
upstream path because separate fibers are used.
What are the basic components of coax (from the inside out)?
(1) the center conductor; (2) dielectric; (3) solid aluminum sheath or outer conductor; (4)
armor (if used); (5) jacket (if used); and (6) messenger (if used).
What can the center conductor be made of?
solid copper or aluminum with a copper cladding (or coating).
What is the role of the dielectric?
supports the center conductor while providing insulation between the center conductor
and aluminum sheath.
What are the functions of the sheath?
encloses the signals and prevents ingress and egress. It also provides structural
support, return (ground) for AC current, and a constant impedance (total opposition to
flow of electrical current) across the entire length of the coax.
To operate, what do active devices require?
electrical power
How is unity gain maintained in amplifiers?
If loss in the coaxial cable is different from the amplifier's gain, input attenuators and
equalizers adjust the loss so that the gain remains the same and the signal level at the
amplifier output is equal across the network.
What does a trunk station contain?
