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Huawei H35-210_V2.5 Exam - Topic 2 Question 88 Discussion

According to the ITU-T G.984.X series standards, the downstream transmission wavelength of the GPON network is ( ) nm.
A) 1490
B) 850
C) 1310
D) 1550

Huawei H35-210_V2.5 Exam - Topic 2 Question 88 Discussion

Actual exam question for Huawei's H35-210_V2.5 exam
Question #: 88
Topic #: 2
[All H35-210_V2.5 Questions]

According to the ITU-T G.984.X series standards, the downstream transmission wavelength of the GPON network is ( ) nm.

Show Suggested Answer Hide Answer
Suggested Answer: A

GPON Wavelengths :

GPON networks use specific wavelengths for upstream and downstream transmission:

Downstream (OLT to ONU) : 1490 nm.

Upstream (ONU to OLT) : 1310 nm.

Optional CATV overlay : 1550 nm (used for video services).

Why 1490 nm?

The ITU-T G.984.x standards specify 1490 nm as the wavelength for downstream data transmission in GPON networks. This wavelength is chosen for optimal performance in fiber-optic communication.

Other Options :

850 nm : Used in multimode fiber for short-distance communication, not in GPON.

1310 nm : Used for upstream transmission in GPON.

1550 nm : Optional wavelength for CATV overlay, not for standard downstream data.

Thus, the correct answer is A .


HCIA Huawei ACCESS Official Documentation , Chapter: GPON Wavelengths.

ITU-T G.984.x Standards for GPON .

by Elroy at Apr 05, 2025, 12:12 PM

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Leslie
6 months ago
I thought it was 1550 nm, but I guess not!
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Jolene
6 months ago
Totally agree, 1490 is the right choice!
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Lavonne
6 months ago
Wait, isn't it 1310 nm for some setups?
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Eliz
7 months ago
Just checked, 1490 nm is correct. Surprised it’s not more common knowledge!
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Ruby
7 months ago
It's definitely 1490 nm for GPON.
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Benedict
7 months ago
I’m pretty confident it’s 1490 nm for GPON, but I need to double-check my notes just to be safe.
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Suzi
7 months ago
I’m torn between 1490 nm and 1550 nm. I feel like I’ve seen both in different contexts.
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Eladia
7 months ago
I remember practicing a question similar to this, and I think 1310 nm was mentioned for something else, but not for GPON.
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Pete
8 months ago
I think the downstream wavelength for GPON is around 1490 nm, but I’m not completely sure.
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Johnna
8 months ago
Wait, I thought GPON used 1310 nm for downstream? Or was it 1550 nm? Ugh, I'm getting my fiber optic standards mixed up. I better review my notes before answering this.
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Mary
8 months ago
Okay, let me think this through step-by-step. The question is asking about the downstream wavelength for GPON, which is defined in the ITU-T G.984.X standards. I remember learning that the downstream is 1490 nm, so I'll go with that.
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Rossana
8 months ago
Hmm, I'm a bit unsure about this one. I know GPON uses different wavelengths, but I can't remember the exact downstream wavelength off the top of my head. I'll have to think this through carefully.
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Cyril
8 months ago
I'm pretty confident this is 1490 nm, since that's the standard downstream wavelength for GPON networks according to the ITU-T G.984.X series.
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Martha
1 year ago
Wait, 1310 nm? Are we laying fiber or building a disco ball? 1490 nm is the answer.
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Ollie
1 year ago
I think you're mistaken, it's actually 1550 nm for the downstream transmission wavelength.
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Terry
1 year ago
No way, 1490 nm is the correct downstream transmission wavelength for the GPON network.
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Willard
1 year ago
1310 nm is the correct answer according to the ITU-T G.984.X series standards.
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Samira
1 year ago
Haha, 850 nm? This isn't the dark ages, folks. 1490 nm is the way to go.
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Rodrigo
1 year ago
1550 nm? What is this, CATV? Come on, it's gotta be 1490 nm!
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Colton
12 months ago
Oh, I see. Thanks for clarifying.
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Ozell
12 months ago
Actually, it's 1490 nm according to the standards.
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Sharee
1 year ago
No way, it's definitely 1550 nm.
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Lorean
1 year ago
I think it's 1490 nm.
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Mitzie
1 year ago
1490 nm, of course! That's the standard for GPON, everyone knows that.
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Hyun
1 year ago
That's correct! 1490 nm is the standard for GPON networks.
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Cyril
1 year ago
Yes, you're right! The downstream transmission wavelength for GPON is 1490 nm.
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Fernanda
1 year ago
I'm not sure, but I think C) 1310 nm is the correct answer based on the ITU-T G.984.X series standards.
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Lashawna
1 year ago
I believe it's D) 1550 nm because that's the standard downstream transmission wavelength for GPON networks.
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Leota
1 year ago
I think the answer is A) 1490 nm.
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