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1-8 TRANSMISSION STATES
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ANALOG TIME-MULTIPLEXED SWITCH
PAM
PAM
ANALOG
VOICE
TERMINAL
ANALOG
VOICE
TERMINAL
ANALOG
VOICE
TERMINAL
A
N
A
L
O
G
T
R
U
N
K
P
O
R
T
L
I
N
E
P
O
R
T
A
N
A
L
O
G
L
I
N
E
P
O
R
T
A
N
A
L
O
G
ANALOG VOICE
ANALOG VOICE
ANALOG VOICE
ANALOG VOICE
P
O
R
T
D
I
G
I
T
A
L
L
I
N
E
D
I
G
I
T
A
L
T
R
U
N
K
P
O
R
T
A
N
A
L
O
G
T
R
U
N
K
P
O
R
T
L
I
N
E
P
O
R
T
A
N
A
L
O
G
ANALOG VOICE
ANALOG VOICE
ANALOG VOICE
ANALOG VOICE
ANALOG VOICE
DIGITAL
VOICE
TERMINAL
DIGITAL
VOICE
TERMINAL
DIGITAL
VOICE
TERMINAL
ANALOG
VOICE
TERMINAL
ANALOG
VOICE
TERMINAL
ANALOG
VOICE
TERMINAL
ANALOG VOICE
PCM
PCM
PCM
PCM
PCM
PCM PCM
PCM
PCM
PCM
PCM
DIGITAL SWITCH
PCM
*
#
0
9 8 7
6 5 4
3 2 1
*
#
0
9 8 7
6 5 4
3 2 1
*
#
0
9 8 7
6 5 4
3 2 1
Figure 1-2. Transmission States for Voice Communication