Discussion

If data link transmits 4000 frames per second, and each slot has 8 bits, the transmission rate of circuit this Time-division multiplexing (TDM) is

Answer: A

The transmission rate is 32 Kbps.

In synchronous TDM each circuit gets one slot in every frame. With 4000 frames per second and 8 bits in each slot, the circuit carries

\[ 4000 \times 8 = 32000\ \text{bits/s} = 32\ \text{Kbps} \]

500 bps and 500 Kbps come from dividing instead of multiplying, and since 32 Kbps is offered, 'None of the mentioned above' is wrong.

The general rule for synchronous TDM is: data rate of one channel = frames per second × bits per slot for that channel.

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