Introducing Fiber-Optic Networks Study guide 2023 with
complete solution
Monitoring the status of optical nodes
By remote means is not critical for maintaining network stability and reliability????
Explaining Status Monitoring
Remote monitoring of optical nodes is a critical function for network stability and
reliability. All scalable nodes support status monitoringTechnology that allows the
network operator to remotely monitor and pinpoint malfunctions anywhere in the
network and analyze them on a computer. technology. A status monitoring node
transponder monitors a number of critical functions, including power supply voltages,
transmitter/receiver status, and temperature, and it usually monitors a tamper switch
mechanism as well. A status monitoring transponder receives downstream information
from a controller located in the headend. It also generates an upstream telemetry carrier
that is combined into the reverse optical transmitter input. This telemetry carrier allows
the transponder to continuously communicate node functions with the controller located
at the headend. Any parameters exceeding a preset threshold will generate an alarm.
Digital return path transmissions
Use dense wavelength division multiplexing (DWDM) digital return transmitters in hub-
to-headend architectures.
What is channel bonding?
A 3.0 revision to Data Over Cable Service Interface Specification (DOCSIS) that
significantly increases upstream and downstream transport data rates.
What is MPEG (Moving Picture Experts Group)?
A universally accepted standard for digital television, first released in 1992.
Which of the following is true about optical nodes?
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 Data Over Cable Service Interface Specification
(DOCSIS) defines the protocols for Internet protocol (IP) telephony over hybrid
fiber/coax (HFC) networks?
PacketCable
In a centralized server video-on-demand (VOD) architecture,
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?
Local ad insertion is performed usually by a video server.
In regard to providing high-speed data (HSD) service,
The cable modem termination system (CMTS) 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 synchronous optical network (SONET)
transmission standard?
SONET is the North American standard used for telephony applications.
Why was the zero-dispersion point in single-mode fiber moved to 1,550 nm?
, To take advantage of the low intrinsic absorption and lower attenuation at 1,550 nm in
single-mode fiber.
What type of single-mode fiber is intended for fiber-to-the-home (FTTH)
installations?
The ITU-T G.657 bend-insensitive fiber (BIF).
What are the primary causes of intrinsic loss in single-mode fiber?
Excessive bending and Rayleigh scattering.???
The phenomenon, total internal reflection, is what enables an optical fiber to
guide light. What characteristic of optical fiber causes total internal reflection?
The difference in refractive indexes, between cladding and core, causes light to be
reflected off the cladding and back into the core along the optical fiber.
Where would you expect Fresnel reflections to occur in a fiber-optic network?
At connections and mechanical splices where the signal source is entering or exiting the
cable.
Chromatic dispersion is a combination of which two dispersions?
Material and waveguide dispersion.
What is one advantage and one disadvantage of single-mode fiber with a large
mode field diameter (MFD)?
The larger the MFD, the easier it is to splice and connectorize the fiber, although it
becomes more sensitive to bending losses.
What is the current standardized outside diameter (OD) of the cladding of single-
mode fiber?
It is 125 μm, with an accuracy of ±1 μm.
What do diameter differences between spliced fibers look like on an optical time
domain reflectometer (OTDR)?
Gain in one direction and high loss in the opposite direction.
Besides protection, what else must the coating on an optical fiber do?
Function over a wide temperature range; be compatible with cable gels; adhere to the
glass cladding over the lifetime of the cable; and be mechanically strippable for splicing
operations.
How do technicians know the specific type of single-mode fiber used in a
particular project?
They have read the project's specification records.
Which type of fiber-optic cable provides the most stable transport characteristics
and additional protection from stresses caused by macrobends and microbends?
Ribbon fiber requires different tools and equipment to perform splicing.
What are the two critical elements that align the optical fibers in a connection?
The C-clip and adapter.
In an optical network, what is reflectance?
Reflectance is the reflected light from a single Fresnel reflection event
How should surface particulates usually be removed from optical connectors?
By using a compressed-air cleaner designed for optical connectors
Since they provide the same functions, what is the primary difference between
the fiber distribution hub (FDH) and fiber access terminal (FAT)?.
The FAT is typically easier to install and has lower fiber counts than the FDH.
Which statement about pigtails used for optical fiber terminations is true?
complete solution
Monitoring the status of optical nodes
By remote means is not critical for maintaining network stability and reliability????
Explaining Status Monitoring
Remote monitoring of optical nodes is a critical function for network stability and
reliability. All scalable nodes support status monitoringTechnology that allows the
network operator to remotely monitor and pinpoint malfunctions anywhere in the
network and analyze them on a computer. technology. A status monitoring node
transponder monitors a number of critical functions, including power supply voltages,
transmitter/receiver status, and temperature, and it usually monitors a tamper switch
mechanism as well. A status monitoring transponder receives downstream information
from a controller located in the headend. It also generates an upstream telemetry carrier
that is combined into the reverse optical transmitter input. This telemetry carrier allows
the transponder to continuously communicate node functions with the controller located
at the headend. Any parameters exceeding a preset threshold will generate an alarm.
Digital return path transmissions
Use dense wavelength division multiplexing (DWDM) digital return transmitters in hub-
to-headend architectures.
What is channel bonding?
A 3.0 revision to Data Over Cable Service Interface Specification (DOCSIS) that
significantly increases upstream and downstream transport data rates.
What is MPEG (Moving Picture Experts Group)?
A universally accepted standard for digital television, first released in 1992.
Which of the following is true about optical nodes?
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 Data Over Cable Service Interface Specification
(DOCSIS) defines the protocols for Internet protocol (IP) telephony over hybrid
fiber/coax (HFC) networks?
PacketCable
In a centralized server video-on-demand (VOD) architecture,
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?
Local ad insertion is performed usually by a video server.
In regard to providing high-speed data (HSD) service,
The cable modem termination system (CMTS) 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 synchronous optical network (SONET)
transmission standard?
SONET is the North American standard used for telephony applications.
Why was the zero-dispersion point in single-mode fiber moved to 1,550 nm?
, To take advantage of the low intrinsic absorption and lower attenuation at 1,550 nm in
single-mode fiber.
What type of single-mode fiber is intended for fiber-to-the-home (FTTH)
installations?
The ITU-T G.657 bend-insensitive fiber (BIF).
What are the primary causes of intrinsic loss in single-mode fiber?
Excessive bending and Rayleigh scattering.???
The phenomenon, total internal reflection, is what enables an optical fiber to
guide light. What characteristic of optical fiber causes total internal reflection?
The difference in refractive indexes, between cladding and core, causes light to be
reflected off the cladding and back into the core along the optical fiber.
Where would you expect Fresnel reflections to occur in a fiber-optic network?
At connections and mechanical splices where the signal source is entering or exiting the
cable.
Chromatic dispersion is a combination of which two dispersions?
Material and waveguide dispersion.
What is one advantage and one disadvantage of single-mode fiber with a large
mode field diameter (MFD)?
The larger the MFD, the easier it is to splice and connectorize the fiber, although it
becomes more sensitive to bending losses.
What is the current standardized outside diameter (OD) of the cladding of single-
mode fiber?
It is 125 μm, with an accuracy of ±1 μm.
What do diameter differences between spliced fibers look like on an optical time
domain reflectometer (OTDR)?
Gain in one direction and high loss in the opposite direction.
Besides protection, what else must the coating on an optical fiber do?
Function over a wide temperature range; be compatible with cable gels; adhere to the
glass cladding over the lifetime of the cable; and be mechanically strippable for splicing
operations.
How do technicians know the specific type of single-mode fiber used in a
particular project?
They have read the project's specification records.
Which type of fiber-optic cable provides the most stable transport characteristics
and additional protection from stresses caused by macrobends and microbends?
Ribbon fiber requires different tools and equipment to perform splicing.
What are the two critical elements that align the optical fibers in a connection?
The C-clip and adapter.
In an optical network, what is reflectance?
Reflectance is the reflected light from a single Fresnel reflection event
How should surface particulates usually be removed from optical connectors?
By using a compressed-air cleaner designed for optical connectors
Since they provide the same functions, what is the primary difference between
the fiber distribution hub (FDH) and fiber access terminal (FAT)?.
The FAT is typically easier to install and has lower fiber counts than the FDH.
Which statement about pigtails used for optical fiber terminations is true?
