
ASM-40 Ver. 1.0 V.24, V.35, X.21 and RS-530 DTE Interface Connectors A-1
Appendix A
Pinouts
A.1 V.24, V.35, X.21 and RS-530 DTE Interface
Connectors
Table A-1
lists the pin assignments of the V.24/RS-232, V.35, X.21 and RS-530
interface connectors.
Table A-1. DTE Interface Signal Assignments
RS-232 V.35 RS-530 X.21 Description Signal
Function
DB-25
Standalone
and Card
Cage
DB-25
Card
Cage
34-Pin
Standalone
Pin Circuit
DB-25
Standalone and
Card Cage
Pin Circuit
DB-25
Card
Cage
DB-15
Standalone
Pin Circuit
(Function)
Protective
Ground
1 1 A Frame 101 1 1 1
(Shield)
Chassis Ground. It
may be isolated
from Signal
Ground.
Signal
Ground
7 7 B Signal 102
7
7 8
(GND)
Common signal
and DC power
supply ground.
Transmitted
Data
2 9
11
P TD(A) 103
S TD(B) 103
2
14
2
14
2
9
(Transmit)
Serial digital data
from DTE. In sync
applications, the
data translations
must occur on the
rising edge of the
transmit clock.
Received
Data
3 12
13
R RD(A) 104
T RD(B) 104
3
16
3
16
4
11
(Receive)
Serial output from
the modem
receiver. In sync
applications, the
data translations
occur on the rising
edge of the clock.
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