A multiplexer combines four 100-Kbps channels using a time slot of 2 bits.…
2016
A multiplexer combines four 100-Kbps channels using a time slot of 2 bits. What is the bit rate ?
- A.
100 Kbps
- B.
200 Kbps
- C.
400 Kbps
- D.
1000 Kbps
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Correct answer: C
Answer: 400 Kbps
Each channel has a data rate of 100 Kbps and is assigned a 2-bit time slot per frame.
Frames per second = channel bit rate ÷ bits per channel per frame = 100,000 bits/s ÷ 2 bits = 50,000 frames/s.
Bits per frame = number of channels × bits per channel = 4 × 2 = 8 bits/frame.
Total bit rate = bits per frame × frames per second = 8 × 50,000 = 400,000 bits/s = 400 Kbps.
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