AT&T DEFINITY 7200 series - Manual (Page 24)

1-4 TRANSMISSION TYPES
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T
s
1
6
1
3
6
4
3. PCM
pulses
4. PCM
output
011 001 110 001 011 110 100
3
3.0
1.4
6.2
1.3
2.8
5.9
4.1
1. Original
signal
2. PAM
pulses
011001110001011110100
Adapted from: Data and Computer Communications, by William Stallings, Macmillan Publishing Co., N.Y., 1988
Figure 1-1. Analog-to-Digital Conversion