Master the critical thresholds for one-way latency and jitter to maintain superior voice quality in Cisco networks.
Table of Contents
Question
What is the maximum one-way latency and jitter tor voice before quality issues arise?
A. ≤ 150 ms Latency and ≤ 30 ms jitter
B. ≤ 100 ms Latency and ≤ 10 ms jitter
C. ≤ 300 ms Latency and ≤ 60 ms jitter
D. ≤ 90 ms Latency and ≤ 30 ms jitter
Answer
A. ≤ 150 ms Latency and ≤ 30 ms jitter
Explanation
In voice communications, latency refers to the time delay experienced as voice packets travel over the network. One-way latency is the time taken for a voice packet to reach its destination from the source. Jitter is the variation in packet arrival times. It’s important to maintain low latency and jitter to ensure high-quality voice calls.
The standard for acceptable voice quality suggests that one-way latency should be 150 ms or less and jitter should be 30 ms or less. Latency beyond 150 ms can cause noticeable delays and affect conversation flow, while jitter beyond 30 ms can result in packets arriving out of order, causing echo and sound distortion.
To manage jitter, voice networks use de-jitter buffers that temporarily store incoming packets to smooth out the delay variation before playing the voice stream. However, if latency or jitter exceeds these thresholds, even de-jitter buffers cannot compensate, leading to degraded voice quality.
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