X.21介面定義

admin @ 2014-03-19 , reply:0

X.21介面定義
X.21介面定義

 


X.21公頭連接器



X.21母頭連接器



X.21介面定義


Pinout for balanced X.21 (according to ISO4903)




















































































































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交叉線定義






































































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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