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1-12 TRANSMISSION STATES
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DCE
ORIGINATING
DCE
DESTINATION SWITCH
RS-232
RS-232RAW BITSDCP DCP 1
DTE
2 DMIASCII ASCII
3-7
USER DEFINED
D
I
G
I
T
A
L
P
O
R
T
D
I
G
I
T
A
L
P
O
R
T
D
I
G
I
T
A
L
P
O
R
T
D
I
G
I
T
A
L
P
O
R
T
DATA
MODULE
DATA
MODULE
DATA
MODULE
DATA
MODULE
DTE
DTE
DATA
MODULE
DS1
PORT
1
D
I
G
I
T
A
L
P
O
R
T
RAW BITS
RS-232 DS1 FORMATDCP
DMIASCII 2
P
O
R
T
D
S
1
DTE
T
R
U
N
K
P
O
R
T
A
N
A
L
O
G
ADU ADUDTE
E
I
A
P
O
R
T
E
I
A
P
O
R
T
DTE
DMIASYNCH ASCII ASYNCH ASCII 2
3-7 USER DEFINED
RS-232 RS-232ADU PROT ADU PROT1 RAW BITS
3-7 USER DEFINED
VOICE GRADE DATAASCII ASCII 2
ANALOG ANALOG1 PCMRS-232 RS-232
P
O
R
T
A
N
A
L
O
G
L
I
N
E
A
N
A
L
O
G
P
O
R
T
DTE
DTE
MODEM
POOLING
CABLE
MODEM
MODEM
MODEM
PCM
3-7 USER DEFINED
Figure 1-3. Transmission States for Data Transmission