Discussion
Maximum data rate of a noiseless 4 kHz channel using T1 PCM system is
Answer: B
Correct answer: 56 kbps
T1 PCM samples at 8000 samples per second and uses seven of the eight bits of each sample for data, the eighth being taken for signalling:
\[ 8000\times 7 = 56{,}000\ \text{bps} \]
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