https://www.stuvia.com/user/performance
BROADBAND SYSTEMS: GPON PROTOCOLS, DSL LINE TESTING, AND FIBER
SPLICING TECHNIQUES Original Questions with Answers and Rationales
Section 1: GPON Protocols (Questions)
1. What does the acronym GPON stand for?
A. General Purpose Optical Network
B. Gigabit Passive Optical Network
C. Gigabit Protocol Over Network
D. Glass Passive Optical Node
Answer: B
Rationale: GPON (Gigabit Passive Optical Network) is a
PON standard defined by ITU-T G.984 that supports
gigabit speeds over passive fiber infrastructure.
2. What is the maximum downstream data rate of a standard
GPON system?
A. 1.25 Gbps
B. 2.488 Gbps
C. 10 Gbps
D. 100 Mbps
Answer: B
Rationale: GPON provides downstream speeds of 2.488
Gbps and upstream speeds of 1.244 Gbps, shared among
all subscribers on the PON.
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3. What is the maximum upstream data rate of a standard
GPON system?
A. 1.244 Gbps
B. 2.488 Gbps
C. 622 Mbps
D. 10 Gbps
Answer: A
Rationale: GPON upstream operates at 1.244 Gbps, half
the downstream rate, reflecting the asymmetric nature of
most broadband traffic.
4. Which wavelength is used for upstream transmission in a
GPON system?
A. 850 nm
B. 1310 nm
C. 1490 nm
D. 1550 nm
Answer: B
Rationale: GPON upstream uses 1310 nm, downstream
uses 1490 nm, and 1550 nm is reserved for RF video
overlay. This wavelength division prevents collision
between directions.
5. What is the maximum logical reach of a GPON system?
A. 10 km
B. 20 km
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C. 60 km
D. 100 km
Answer: C
Rationale: GPON supports a logical reach of up to 60 km
(typically 20 km physical reach with 1:64 split ratio). This
allows the OLT to serve customers far from the central
office.
6. What is the maximum split ratio supported by GPON?
A. 1:16
B. 1:32
C. 1:64
D. 1:128
Answer: D
Rationale: GPON supports split ratios up to 1:128, though
1:32 and 1:64 are most commonly deployed due to power
budget considerations.
7. In a GPON network, what does the OLT stand for?
A. Optical Line Terminal
B. Optical Link Transmitter
C. Outdoor Line Tap
D. Optical Loss Tester
Answer: A
Rationale: The OLT is located at the service provider's
BROADBAND SYSTEMS: GPON PROTOCOLS, DSL LINE TESTING, AND FIBER
SPLICING TECHNIQUES Original Questions with Answers and Rationales
Section 1: GPON Protocols (Questions)
1. What does the acronym GPON stand for?
A. General Purpose Optical Network
B. Gigabit Passive Optical Network
C. Gigabit Protocol Over Network
D. Glass Passive Optical Node
Answer: B
Rationale: GPON (Gigabit Passive Optical Network) is a
PON standard defined by ITU-T G.984 that supports
gigabit speeds over passive fiber infrastructure.
2. What is the maximum downstream data rate of a standard
GPON system?
A. 1.25 Gbps
B. 2.488 Gbps
C. 10 Gbps
D. 100 Mbps
Answer: B
Rationale: GPON provides downstream speeds of 2.488
Gbps and upstream speeds of 1.244 Gbps, shared among
all subscribers on the PON.
,https://www.stuvia.com/user/performance
3. What is the maximum upstream data rate of a standard
GPON system?
A. 1.244 Gbps
B. 2.488 Gbps
C. 622 Mbps
D. 10 Gbps
Answer: A
Rationale: GPON upstream operates at 1.244 Gbps, half
the downstream rate, reflecting the asymmetric nature of
most broadband traffic.
4. Which wavelength is used for upstream transmission in a
GPON system?
A. 850 nm
B. 1310 nm
C. 1490 nm
D. 1550 nm
Answer: B
Rationale: GPON upstream uses 1310 nm, downstream
uses 1490 nm, and 1550 nm is reserved for RF video
overlay. This wavelength division prevents collision
between directions.
5. What is the maximum logical reach of a GPON system?
A. 10 km
B. 20 km
, https://www.stuvia.com/user/performance
C. 60 km
D. 100 km
Answer: C
Rationale: GPON supports a logical reach of up to 60 km
(typically 20 km physical reach with 1:64 split ratio). This
allows the OLT to serve customers far from the central
office.
6. What is the maximum split ratio supported by GPON?
A. 1:16
B. 1:32
C. 1:64
D. 1:128
Answer: D
Rationale: GPON supports split ratios up to 1:128, though
1:32 and 1:64 are most commonly deployed due to power
budget considerations.
7. In a GPON network, what does the OLT stand for?
A. Optical Line Terminal
B. Optical Link Transmitter
C. Outdoor Line Tap
D. Optical Loss Tester
Answer: A
Rationale: The OLT is located at the service provider's
