PSTN - Data Rate for free voice channel

Q.  If the voice channel is free in PSTN, then what would be the maximum data rate supported by 3.1 kHz bandwidth of voice channel?
- Published on 18 Nov 15

a. 2000 bps
b. 4000 bps
c. 6000 bps
d. 8000 bps

ANSWER: 6000 bps

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