X.21 |
DTE
Pin |
Name |
Dir |
Description |
Type |
1 |
n/a |
|
Shield |
Ground |
2 |
T (A) |
|
Transmit (A) |
Data |
3 |
C (A) |
|
Control (A) |
Control |
4 |
R (A) |
|
Receive (A) |
Data |
5 |
I (A) |
|
Indication (A) |
Control |
6 |
S (A) |
|
Signal Timing (A) |
Timing |
7 |
B (A) |
|
Byte Timing (A) |
Timing |
8 |
G |
|
Ground |
Ground |
9 |
T (B) |
|
Transmit (B) |
Data |
10 |
C (B) |
|
Control (B) |
Control |
11 |
R (B) |
|
Receive (B) |
Data |
12 |
I (B) |
|
Indication (B) |
Control |
13 |
S (B) |
|
Signal Timing (B) |
Timing |
14 |
B (B) |
|
Byte Timing (B) |
Timing |
15 |
|
|
unused |
|