Discussion
Thirty such channels are multiplexed with two extra slots for signalling and synchronisation. The aggregate rate is
Answer: B
Thirty-two slots of sixty-four kilobits each:
\[ 32 \times 64 = 2048 \ \mathrm{kbit/s} \]
giving 2.048 Mbit/s, the European primary rate. 1.920 Mbit/s counts only the thirty traffic channels and forgets the overhead. 1.544 Mbit/s is the North American rate, built from twenty-four channels on a different plan. And 4.096 Mbit/s doubles the count. Overhead slots are part of the aggregate rate even though they carry no traffic, which is the point the wrong answer misses.
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