Fiber Install & Activation Exam Questions with
Answers
1. Which standards organization is considered to be the creator of the
world's most recognized communications standards, known as
"recommen- dations?": The International Telecommunication Union
(ITU).
2. In which component in a fiber-optics communications system do
changes to the intensity of the optical signal occur?: The optical
transmitter.
3. What is a drawback of using Fabry-Perot (F-P) lasers in high-speed
data (HSD) networks?: The emission of a number of discrete
wavelengths or side modes.
4. Why are light emitting diodes (LED) most effective when coupled to multi-
mode fiber?: The LED emits optical energy in hundreds of pathways,
each carrying the same data that is coupled into a fiber in separate
paths or modes.
5. What are the factors that contribute to an optical receiver's sensitivity?-
,: Noise, responsivity, response time, linear response, back reflection,
and optical detector material.
6. What is a positive-intrinsic-negative (PIN) diode?: 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.
7. What does the amplification process in an avalanche photodiode
(APD) introduce into the electrical output of an optical detector?: Noise.
8. What functions does the detector in an optical receiver perform?: Conver-
sion of an optical carrier to an electrical signal, and demodulation of the
modulated optical carrier.
9. What happens if the optical signal exceeds the maximum specified
input power into a photodetector?: Nonlinear operation resulting in
distortion, data errors, and signal loss.
10.What is a characteristic of light in a laser beam?: The laser beam
consists of a limited range of wavelengths (monochromatic), with all
light waves in phase (coherent light).
11.What is involved when monitoring the status of optical nodes?: The use
of a node transponder that continuously monitors several critical
functions.
,12.Digital return path transmissions: Use dense wavelength division
multiplexing (DWDM) digital return transmitters in hub-to-headend
architectures.
13.What is channel bonding?: A 3.0 revision to Data Over Cable Service
Inter- face Specification (DOCSIS) that significantly increases upstream
and downstream transport data rates.
14.What is MPEG Moving Picture Experts Group?: A universally accepted
stan- dard for digital television, first released in 1992.
15.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.
16.Internet protocol (IP) telephony systems: Require a call management
server, media gateway, signaling gateway, billing system, and cable
modem termination system (CMTS).
17.How does a centralized server VOD Video-on-demand architecture
simplify server management compared to distributed server architecture?:
The number of servers needed for video content storage is smaller than
in the distributed server architecture.
18.Which of the following statements about local ad insertion is true?: A
, video server usually performs local ad insertion.
19.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.
20. Which of the following is true about the SONET Synchronous
optical network
transmission standard?: SONET defines OCOptical carrier data rates and
inter- face standards that enable international communications carriers
to interconnect existing fiber-optic transmission networks.
21.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.
22.What type of SMF single-mode fiber is ideal for FTTH fiber-to-the-
home installations?: The ITU-T G.657 bend-insensitive fiber (BIF).
23. What are the primary causes of intrinsic loss in SMF Single-mode fiber?-
: Material absorption and Rayleigh scattering.
24.The phenomenon, total internal reflection, is what enables an optical
fiber to guide light. What characteristic of optical fiber causes total internal
reflec- tion?: The difference in refractive indexes, between cladding and
Answers
1. Which standards organization is considered to be the creator of the
world's most recognized communications standards, known as
"recommen- dations?": The International Telecommunication Union
(ITU).
2. In which component in a fiber-optics communications system do
changes to the intensity of the optical signal occur?: The optical
transmitter.
3. What is a drawback of using Fabry-Perot (F-P) lasers in high-speed
data (HSD) networks?: The emission of a number of discrete
wavelengths or side modes.
4. Why are light emitting diodes (LED) most effective when coupled to multi-
mode fiber?: The LED emits optical energy in hundreds of pathways,
each carrying the same data that is coupled into a fiber in separate
paths or modes.
5. What are the factors that contribute to an optical receiver's sensitivity?-
,: Noise, responsivity, response time, linear response, back reflection,
and optical detector material.
6. What is a positive-intrinsic-negative (PIN) diode?: 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.
7. What does the amplification process in an avalanche photodiode
(APD) introduce into the electrical output of an optical detector?: Noise.
8. What functions does the detector in an optical receiver perform?: Conver-
sion of an optical carrier to an electrical signal, and demodulation of the
modulated optical carrier.
9. What happens if the optical signal exceeds the maximum specified
input power into a photodetector?: Nonlinear operation resulting in
distortion, data errors, and signal loss.
10.What is a characteristic of light in a laser beam?: The laser beam
consists of a limited range of wavelengths (monochromatic), with all
light waves in phase (coherent light).
11.What is involved when monitoring the status of optical nodes?: The use
of a node transponder that continuously monitors several critical
functions.
,12.Digital return path transmissions: Use dense wavelength division
multiplexing (DWDM) digital return transmitters in hub-to-headend
architectures.
13.What is channel bonding?: A 3.0 revision to Data Over Cable Service
Inter- face Specification (DOCSIS) that significantly increases upstream
and downstream transport data rates.
14.What is MPEG Moving Picture Experts Group?: A universally accepted
stan- dard for digital television, first released in 1992.
15.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.
16.Internet protocol (IP) telephony systems: Require a call management
server, media gateway, signaling gateway, billing system, and cable
modem termination system (CMTS).
17.How does a centralized server VOD Video-on-demand architecture
simplify server management compared to distributed server architecture?:
The number of servers needed for video content storage is smaller than
in the distributed server architecture.
18.Which of the following statements about local ad insertion is true?: A
, video server usually performs local ad insertion.
19.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.
20. Which of the following is true about the SONET Synchronous
optical network
transmission standard?: SONET defines OCOptical carrier data rates and
inter- face standards that enable international communications carriers
to interconnect existing fiber-optic transmission networks.
21.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.
22.What type of SMF single-mode fiber is ideal for FTTH fiber-to-the-
home installations?: The ITU-T G.657 bend-insensitive fiber (BIF).
23. What are the primary causes of intrinsic loss in SMF Single-mode fiber?-
: Material absorption and Rayleigh scattering.
24.The phenomenon, total internal reflection, is what enables an optical
fiber to guide light. What characteristic of optical fiber causes total internal
reflec- tion?: The difference in refractive indexes, between cladding and
