1
FIBER INSTALLATION AND ACTIVATION EXAM /
QUESTIONS AND CORRECT ANSWERS 2025/2026
GRADED A+.
Which standards organization is considered to be the creator of the world's most
recognized communications standards, know as "recommendations"? -
(answers)ITU
In which component in a fiber-optics communication system do changes to the
intensity of the optical signal occur? - (answers)The optical transmitter
What is the drawback of using F-P lasers in HSD networks? - (answers)The
emission of a number of discrete wavelengths or side modes.
Why are laser diodes most effective when coupled to a singlemode fiber? -
(answers)It's high coupled power, directionality. and speed.
What are the factors that contribute to an optical receiver's sensitivity? -
(answers)Noise, responsitivity, response time, linear response, back reflection,
and optical detector material.
What is a PIN diode? - (answers)An optical detector with current flow that is
linear to the intensity of light photons, with one electron/hole pair created for
every absorbed photon until saturation.
What does the amplification process in an APD introduce into the electrical
output of an optical detector? - (answers)Noise
, 2
What functions does the detector in an optical receiver perform? -
(answers)Conversion of an optical carrier to an electrical signal, and demodulation
of the modulated optical carrier.
What happens if the optical signal exceeds the maximum specified input power
into a photodetector? - (answers)Nonlinear operation resulting in distortion, data
errors, and signal loss.
What is a characteristic of light in a laser beam? - (answers)The laser beam
consists of a limited range of wavelengths (monochromatic), with all light waves
in phase (coherent light).
Monitoring the status of optical nodes - (answers)Involves the use of a node
transponder that continuously monitors a number of critical functions.
Digital return path transmissions - (answers)Use dense wavelength division
multiplexing (DWDM) digital return transmitters in hub-to-headend architectures.
What is channel bonding? - (answers)A 3.0 revision to Data Over Cable Service
Interface Specification (DOCSIS) that significantly increases upstream and
downstream transport data rates.
What is MPEG? - (answers)A universally accepted standard for digital television,
first released in 1992.
, 3
Which of the following is true about optical nodes? - (answers)They contain four
main sections: the optical reciever, 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 networks? - (answers)PacketCable
In a centralized server VOD architecture, - (answers)The number of servers
needed for video content storage is smaller than in distributed server
architecture.
Which of the following statements about local ad insertion is true? -
(answers)Local ad insertion is performed usually by a video server.
In regard to providing high-speed data (HSD) service, - (answers)The CMTS can
provide a data transfer rate up to 38Mbps using 256-QAM in a single 6MHz
channel.
Which of the following is true about the SONET transmission standard? -
(answers)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? -
(answers)To take advantage of the low intrinsic absorption and lower attenuation
at 1550nm single-mode fiber.
FIBER INSTALLATION AND ACTIVATION EXAM /
QUESTIONS AND CORRECT ANSWERS 2025/2026
GRADED A+.
Which standards organization is considered to be the creator of the world's most
recognized communications standards, know as "recommendations"? -
(answers)ITU
In which component in a fiber-optics communication system do changes to the
intensity of the optical signal occur? - (answers)The optical transmitter
What is the drawback of using F-P lasers in HSD networks? - (answers)The
emission of a number of discrete wavelengths or side modes.
Why are laser diodes most effective when coupled to a singlemode fiber? -
(answers)It's high coupled power, directionality. and speed.
What are the factors that contribute to an optical receiver's sensitivity? -
(answers)Noise, responsitivity, response time, linear response, back reflection,
and optical detector material.
What is a PIN diode? - (answers)An optical detector with current flow that is
linear to the intensity of light photons, with one electron/hole pair created for
every absorbed photon until saturation.
What does the amplification process in an APD introduce into the electrical
output of an optical detector? - (answers)Noise
, 2
What functions does the detector in an optical receiver perform? -
(answers)Conversion of an optical carrier to an electrical signal, and demodulation
of the modulated optical carrier.
What happens if the optical signal exceeds the maximum specified input power
into a photodetector? - (answers)Nonlinear operation resulting in distortion, data
errors, and signal loss.
What is a characteristic of light in a laser beam? - (answers)The laser beam
consists of a limited range of wavelengths (monochromatic), with all light waves
in phase (coherent light).
Monitoring the status of optical nodes - (answers)Involves the use of a node
transponder that continuously monitors a number of critical functions.
Digital return path transmissions - (answers)Use dense wavelength division
multiplexing (DWDM) digital return transmitters in hub-to-headend architectures.
What is channel bonding? - (answers)A 3.0 revision to Data Over Cable Service
Interface Specification (DOCSIS) that significantly increases upstream and
downstream transport data rates.
What is MPEG? - (answers)A universally accepted standard for digital television,
first released in 1992.
, 3
Which of the following is true about optical nodes? - (answers)They contain four
main sections: the optical reciever, 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 networks? - (answers)PacketCable
In a centralized server VOD architecture, - (answers)The number of servers
needed for video content storage is smaller than in distributed server
architecture.
Which of the following statements about local ad insertion is true? -
(answers)Local ad insertion is performed usually by a video server.
In regard to providing high-speed data (HSD) service, - (answers)The CMTS can
provide a data transfer rate up to 38Mbps using 256-QAM in a single 6MHz
channel.
Which of the following is true about the SONET transmission standard? -
(answers)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? -
(answers)To take advantage of the low intrinsic absorption and lower attenuation
at 1550nm single-mode fiber.
