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Appendix G – X.21/V.11 Data Channel Pinout
X.21/V.11 Data Channel connectors
(15 Way DB25 Type Configured DCE)
DATA CHANNEL CONNECTIONS
Name
Description
Type at Connector
DCE – DB15
Female
Protective Ground
-
1
G
Signal Ground
-
8
T(A)
TxDa
Input
2
T(B)
TxDb
Input
9
R(A)
RxDa
Output
4
R(B)
RxDb
Output
11
S(A)
Clock a
Output
6
S(B)
Clock b
Output
13
I(A)
Indicate a
Output
5
I(B)
Indicate b
Output
12
C(A)
Control a
Input
3
C(B)
Control b
Input
10
X(A)
Ext Clock a
Input
7
X(B)
Ext Clock b
Input
14
Notes:
Connector shell and termination must be as specified in the EMC section contained in
Appendix C.
17
G-Converter 2048 Channel Card