December2015 Cs Q23

0. Four channels are multiplexed using TDM. If each channel sends 100 bytes/second and we multiplex 1 byte per channel, then the bit rate for the link is __________.

  • Option : D
  • Explanation :
    The multiplexer is shown in the Figure.


    Each frame carries 1 byte from each channel; the size of each frame, therefore, is 4bytes, or 32 bits. Because each channel is sending 100 bytes/s and a frame carries 1 byte from each channel, the frame rate must be 100 frames per second. The bit rate is 100 × 32 = 3200 bps.
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