X.21公头连接器
X.21母头连接器
X.21接口定义
Pin | Name | DTE I/O | Description | Type |
---|---|---|---|---|
1 | Shield | 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) / unused | Byte Timing (A) or unassigned | 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) / unused | Byte Timing (B) or unassigned | Timing | |
15 | unused |
X.21 | X.21 |
---|---|
1 | 1 |
2 | 4 |
3 | 5 |
4 | 2 |
5 | 3 |
6 | 7 |
7 | 6 |
8 | 8 |
9 | 11 |
10 | 12 |
11 | 9 |
12 | 10 |
13 | 14 |
14 | 13 |
15 |
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