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Question 20328
JEE Physics · Hard

Principles of Communication: Digital Communication MCQ

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Digital CommunicationHardQuestion 20328

Question

The telephone network originally used 4 kHz bandwidth channels (300–3400 Hz voice). With PCM at 8-bit, 8000 samples/s, the bit rate per channel is 64 kbps. A T1 line carrying 24 such channels plus framing has a total bit rate of:
  1. A
    1.544 Mbps
    Correct
  2. B
    1.024 Mbps
  3. C
    2.048 Mbps
  4. D
    64 kbps

Correct answer

1.544 Mbps

Explanation

24 channels × 64 kbps = 1536 kbps. Plus framing bit: 1 bit/frame × 8000 frames/s = 8 kbps. Total = 1536 + 8 = 1544 kbps = 1.544 Mbps. This is the North American T1 standard. Europe uses E1: 32 channels (30 voice + 2 signalling) = 2.048 Mbps.

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