Telecommunications Question:

A 2MB PCM(pulse code modulation) has?
a) 32 channels
b) 30 voice channels & 1 signaling channel.
c) 31 voice channels & 1 signaling channel.
d) 32 channels out of which 30 voice channels, 1 signaling channel, & 1 synchronization channel.

Answer is D.
A 2Mb PCM line has 32 channels out of which 30 voice channels, 1 signaling channel, & 1 synchronization channel(time slot 0).

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