https://www.stuvia.com/user/performance
BROADBAND SYSTEMS: XGS-PON, ADVANCED DSL DIAGNOSTICS, AND RIBBON
FIBER SPLICING Original Questions with Answers and Rationales
Section 1: XGS-PON (Questions)
1. What does the acronym XGS-PON stand for?
A. Extended Gigabit Service Passive Optical Network
B. Ten Gigabit Symmetrical Passive Optical Network
C. Extra Gigabit Speed Passive Optical Network
D. Extended Gigabit Symmetrical Passive Optical Network
Answer: B
Rationale: XGS-PON stands for 10 Gigabit Symmetrical
Passive Optical Network. The "X" represents 10, "G" for
Gigabit, and "S" for Symmetrical.
2. What is the downstream data rate of XGS-PON?
A. 2.488 Gbps
B. 10 Gbps
C. 1.25 Gbps
D. 40 Gbps
Answer: B
Rationale: XGS-PON provides 10 Gbps downstream and
10 Gbps upstream, making it a symmetrical 10G PON
technology defined by ITU-T G.9807.1.
3. What is the upstream data rate of XGS-PON?
A. 2.488 Gbps
,https://www.stuvia.com/user/performance
B. 1.244 Gbps
C. 10 Gbps
D. 5 Gbps
Answer: C
Rationale: XGS-PON is symmetrical, providing 10 Gbps
upstream and 10 Gbps downstream, unlike GPON which
is asymmetrical (2.488 Gbps down / 1.244 Gbps up).
4. Which ITU-T standard defines XGS-PON?
A. G.984
B. G.9807.1
C. G.988
D. G.983
Answer: B
Rationale: XGS-PON is specified in ITU-T G.9807.1. GPON
is G.984; OMCI management is G.988; BPON is G.983.
5. Which wavelength is used for downstream transmission in
XGS-PON?
A. 1310 nm
B. 1490 nm
C. 1577 nm
D. 1550 nm
Answer: C
Rationale: XGS-PON uses 1577 nm for downstream and
1270 nm for upstream, different from GPON's 1490 nm
, https://www.stuvia.com/user/performance
down / 1310 nm up, allowing coexistence on the same
fiber.
6. Which wavelength is used for upstream transmission in
XGS-PON?
A. 1310 nm
B. 1270 nm
C. 1490 nm
D. 1550 nm
Answer: B
Rationale: XGS-PON upstream uses 1270 nm. The use of
different wavelengths from GPON allows both
technologies to coexist on the same ODN using WDM.
7. How does XGS-PON coexist with existing GPON on the
same fiber?
A. They cannot coexist
B. Using wavelength division multiplexing (WDM) to
separate the different wavelengths
C. By sharing the same wavelength with time division
D. By using different fibers only
Answer: B
Rationale: XGS-PON uses different wavelengths (1577 nm
down / 1270 nm up) than GPON (1490 nm down / 1310
nm up), so WDM combiners allow both to operate on the
same fiber simultaneously.
BROADBAND SYSTEMS: XGS-PON, ADVANCED DSL DIAGNOSTICS, AND RIBBON
FIBER SPLICING Original Questions with Answers and Rationales
Section 1: XGS-PON (Questions)
1. What does the acronym XGS-PON stand for?
A. Extended Gigabit Service Passive Optical Network
B. Ten Gigabit Symmetrical Passive Optical Network
C. Extra Gigabit Speed Passive Optical Network
D. Extended Gigabit Symmetrical Passive Optical Network
Answer: B
Rationale: XGS-PON stands for 10 Gigabit Symmetrical
Passive Optical Network. The "X" represents 10, "G" for
Gigabit, and "S" for Symmetrical.
2. What is the downstream data rate of XGS-PON?
A. 2.488 Gbps
B. 10 Gbps
C. 1.25 Gbps
D. 40 Gbps
Answer: B
Rationale: XGS-PON provides 10 Gbps downstream and
10 Gbps upstream, making it a symmetrical 10G PON
technology defined by ITU-T G.9807.1.
3. What is the upstream data rate of XGS-PON?
A. 2.488 Gbps
,https://www.stuvia.com/user/performance
B. 1.244 Gbps
C. 10 Gbps
D. 5 Gbps
Answer: C
Rationale: XGS-PON is symmetrical, providing 10 Gbps
upstream and 10 Gbps downstream, unlike GPON which
is asymmetrical (2.488 Gbps down / 1.244 Gbps up).
4. Which ITU-T standard defines XGS-PON?
A. G.984
B. G.9807.1
C. G.988
D. G.983
Answer: B
Rationale: XGS-PON is specified in ITU-T G.9807.1. GPON
is G.984; OMCI management is G.988; BPON is G.983.
5. Which wavelength is used for downstream transmission in
XGS-PON?
A. 1310 nm
B. 1490 nm
C. 1577 nm
D. 1550 nm
Answer: C
Rationale: XGS-PON uses 1577 nm for downstream and
1270 nm for upstream, different from GPON's 1490 nm
, https://www.stuvia.com/user/performance
down / 1310 nm up, allowing coexistence on the same
fiber.
6. Which wavelength is used for upstream transmission in
XGS-PON?
A. 1310 nm
B. 1270 nm
C. 1490 nm
D. 1550 nm
Answer: B
Rationale: XGS-PON upstream uses 1270 nm. The use of
different wavelengths from GPON allows both
technologies to coexist on the same ODN using WDM.
7. How does XGS-PON coexist with existing GPON on the
same fiber?
A. They cannot coexist
B. Using wavelength division multiplexing (WDM) to
separate the different wavelengths
C. By sharing the same wavelength with time division
D. By using different fibers only
Answer: B
Rationale: XGS-PON uses different wavelengths (1577 nm
down / 1270 nm up) than GPON (1490 nm down / 1310
nm up), so WDM combiners allow both to operate on the
same fiber simultaneously.
