And as a brief conclusion:
In binary with 8 digits.
8000 samples per second
which each sample consists of
8 bits 8000 × 8=64Kbps
For transferring them we need
a media which provide such
bit rate
DS0: provides one 64kbps channel.
E1: 32 DS0 or 32 channels with 64kbp.
Hope they come in use,
Br