Nokia Certified Network Associate (NCNA) — Question 29

How many DS-3 frames can be transported in an OC-3 frame?

Answer options

• A. 1
• B. 2
• C. 3
• D. 4

Correct answer: C

Explanation

An OC-3 frame has a data rate of 155.52 Mbps, while each DS-3 frame operates at 44.736 Mbps. Therefore, you can fit three DS-3 frames within the bandwidth of one OC-3 frame. The other options are incorrect because they underestimate or overestimate the capacity.