AT&T 2500 series, 7500 series, 7100 series 12TRANSMISSION States Originating Switch Destination

1-12TRANSMISSION STATES

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ORIGINATING

SWITCH

DESTINATION

DCE

DCE

D

D

I

P

I

P

DATA

G

O

G O

DATA

DTE

I

R

I

R

MODULE

MODULE

T

T

T

T

A

A

L

L

D

D

DATA

I

P

I

P

DATA

DTE

DTE

MODULE

G O

G O

MODULE

I

R

I

R

1

RS-232

DCP

T

T

RAW BITS

T

T

DCP

RS-232

A

A

L

L

2

ASCII

DMI

ASCII

3-7

USER DEFINED

A

N P

MODEM

A O

MODEM

L

R

POOLING

O T

CABLE

G

PCM

A

A

T

N L

P

N

P

A I

O

A

R

O

DTE

MODEM

L

N R

L

U

R

MODEM

DTE

O E T

O

N

T

G

G

K

1

RS-232

ANALOG

PCM

ANALOG

RS-232

2

ASCII

VOICE GRADE DATA

ASCII

3-7

USER DEFINED

P

DTE

ADU

E

P

E

ADU

DTE

I

O

I

O

A R

A R

T

T

1

RS-232

ADU PROT

RAW BITS

ADU PROT

RS-232

2

ASYNCH ASCII

DMI

ASYNCH ASCII

3-7

USER DEFINED

D

DATA

I

P

D

P

DS1

DTE

G O

MODULE

I

R

S

O

PORT

T

T

1

R

1

A

T

RS-232

DCP

L

RAW BITS

DS1 FORMAT

2

ASCII

DMI

3-7

USER DEFINED

Figure 1-3.Transmission States for Data Transmission