H31-311: HCIA-Transmission V2.5Demo

By Huawei · Question Mode

QuestionQ33

AI Overview

Which of the following scenarios require dispersion compensation?

Choose three
  • A In a point-to-point 40-channel 10G and 2.5G hybrid transmission system, the fiber dispersion coefficient is 20 ps/(nm km) and the distance between site A and site B is 80 km.
  • B In a point-to-point 40-channel 10G and 100G hybrid transmission system, the fiber dispersion coefficient is 20 ps/(nm km) and the distance between site A and site B is 80 km.
  • C In a point-to-point 40-channel 100G system, the fiber dispersion coefficient is 20 ps/(nm km) and the distance between site A and site B is 80 km.
  • D In a point-to-point 80-channel 10G system, the fiber dispersion coefficient is 20 ps/(nm km) and the distance between site A and site B is 80 km.
Explanation

An 80 km fiber span with a dispersion coefficient of 20 ps/(nm·km) accumulates 1600 ps/nm of chromatic dispersion. This requires compensation for the 10G channels present in the hybrid 10G/2.5G, hybrid 10G/100G, and 80-channel 10G systems. A 100G-only coherent system tolerates far more than 1600 ps/nm through coherent receiver processing, so external dispersion compensation is not required.

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