Discussion
What is the percentage of over head on a T1 carrier (1.544 Mbps) ?
Answer: B
Correct answer: 13%
Of every 8-bit sample T1 devotes 1 bit to signalling, and each 193-bit frame adds a framing bit:
\[ \frac{1}{8} = 12.5\% \quad\text{plus}\quad \frac{1}{193} \approx 0.5\% \]
which together come to about 13 per cent.
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