IBM 3872 User Manual page 50

DATA TERMINAL EQUIPMENT
DTE
DTE MODEM INTERFACE
DATA TERMINAL READY
CALLING INDICATOR
FRAME GROUND
DIGIT PRESENT
ABANDON CALL
CALL REQUEST
PRESENT NEXT DIGIT
POWER INDICATION
SIGNAL GROUND
DISTANT STATION CONNECTED
DIGIT SIGNAL LEAD
DIGIT SIGNAL tEAD
'b~iT
SIGNAL LEAD:
DIGIT~IGNAt
LEAD
DATA LINE OCCUPIED
a
10
II
12
13
14
15
16
17
18
19
20
21
22
23
24
25
DATA COMMUNICATION EQUIPMENT
MODEM
FRAME GROUND
TRANSMIT DATA
RECEIVE DATA
DATA SET READY
IJ
DATA TERMINAL READY
DATA
COMMUNICATION EQUIPMENT
DPR
ACR
AC()
~~~
fJ
PWI
1--'~.i--+-~
- SIGNAL GROUND
23
24
25
TRANSMIT DATA
RECEIVE DATA
DATA SET READY
DAA
SWITCH HOOK (SH)
g~~~ ~:~G IJ
COUPLER CUT THROUGH (CCT)
RING INDICATOR (RI)
DATA COMMUNICATIONS EQUIPMENT DATA TERMINAL EQUIPMENT
DAA
DATA TIP
DATA RING
RING INDICATOR (RI)
SWITCH HOOK ISH)
IJ
COUPLER THROUGH (CCTJ
DATA COUPLER CBS
MODEM
TRANSMIT DATA
RE~EDATA
SIGNAL GROUND
10
11
12
13
14
15
16
17
IJ
:~
DATA TERMINAL READY
r--...--r-:c~-::-1~
22
23
24
25
AA
TRANSMIT DATA
RECEIVE DATA
OFF-HOOK (OH)
II'
DATA MODEM READY IDA)\
COMMON
DTE
DATA SET READY
DATA TERMINAL READY
CALLING INDICATOR
~
AUTO CALL ORIGINATION
AND A UT OMA TIC ANSWER
CONNECT TO THE DAA
CABLE THROUGH A 25-PIN
'D' CONNECTOR (SEE FIGURE 3-3)
PIN NUMBERS IN THAT
CONNECTOR ARE GIVEN HERE
FOR THE MODEM/DTE INTERFACE.
INDICATORS
a
DATA LINE OCCUPIED
B
PRESENT NEXT DIGIT
IJ
READY
II
OFF-HOOK
II
COUPLER CUT THROUGH
m
DATA CHANNEL READY
Figure 3-9. Modem Features and Interfaces for Automatic Call Origination and Automatic Answering
3-16 IBM 3872 Modem User's Guide