Discuss Nokia 4A0-F10 Exam Topic 3 Question 1

An optical link experiences unexpectedly high signal loss immediately after a fiber cable is routed around a very tight corner. What is the most likely cause?

AChromatic dispersion

BExcessive macrobending

CDSL crosstalk

DDynamic bandwidth allocation

Suggested Answer: B

Macrobending occurs when an optical fiber is bent with a radius smaller than its supported minimum bend radius. The excessive bend can cause part of the optical signal to escape from the core, increasing attenuation and reducing the received optical power. This problem can appear after poor cable installation, improper storage, or routing the cable sharply around structural objects. Chromatic dispersion causes different wavelengths or spectral components of an optical pulse to travel at slightly different speeds, but it is not normally triggered by one tight physical corner. DSL crosstalk applies to copper pairs, while Dynamic Bandwidth Allocation controls upstream transmission opportunities in a PON. Correcting the cable routing and respecting the specified bend radius can remove or reduce the loss.

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12 comments · newest first

Osvaldo 1 month ago

I'm not so sure. What about A) Chromatic dispersion? But I lean towards B too.

Luke 2 months ago

Agreed! Macrobending can cause significant loss. It's a common issue.

Chana 2 months ago

I think it's B) Excessive macrobending. That tight corner could really mess things up.

Karan 2 months ago

I thought dynamic bandwidth allocation could cause issues too, but maybe not this time?

Lonna 2 months ago

Nah, it's not DSL crosstalk. That's not even relevant here.

Francene 2 months ago

Wait, could it be A) Chromatic dispersion instead? Just wondering.

Arthur 2 months ago

Agreed, macrobending is a common issue in those situations.

Daron 3 months ago

Definitely B) Excessive macrobending. That tight corner is a killer!

Mendy 3 months ago

I’m a bit confused about DSL crosstalk being an option here. It seems more relevant to copper lines than fiber optics.

Anissa 3 months ago

This question feels familiar; I think we had a similar practice question about signal loss due to bending. I’m leaning towards excessive macrobending.

Krissy 3 months ago

I’m not entirely sure, but I think chromatic dispersion is more related to different wavelengths rather than physical bends in the fiber.

Olive 3 months ago

I remember studying about macrobending and how it can cause significant signal loss, especially around tight corners.

Nokia 4A0-F10 Exam - Topic 3 Question 1 Discussion