Nokia Certified Network Professional – IP/MPLS Services — Question 10

When monitoring the quality of the received signal in WDM, an open eye indicates:

Answer options

• A. Low noise
• B. High distortion
• C. High jitter
• D. Presence of high inter-symbolic interference

Correct answer: D

Explanation

An open eye diagram indicates that the signal is clear and not significantly affected by distortion or noise, which aligns with the presence of high inter-symbol interference. The other options describe conditions that would typically lead to a closed eye diagram rather than an open one.