642-321 Cisco Optical SDH Exam (SDH)
Note 1: 642-321 Exhibit and all related diagrams are not shown in demo questions.
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Note 2: 642-321 Answers are not shown in demo questions.
Exhibits and Answers are only provided in the Full Version.
Demo Question 4.
Why are the 1300 nm and 1550 nm regions of the fiber spectrum primarily used for optical communications?
A. They are both regions of lowest loss.
B. They are both regions of low reflections
C. They are both regions of low index of refraction.
D. They are both regions of low chromatic dispersion.
E. They are both regions of low Polarization Mode Dispersion (PM.
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