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Table A-5. X.21 Cable Interface
4821-A2-GN20-00
Signal
Signal Common
Transmitted Data
Received Data
Request to Send
Data Channel Received Line Signal Detector
Transmit Signal Element Timing (DTE Source)
Receiver Signal Element Timing (DCE Source)
April 2002
A. Connectors, Cables, and Pin Assignments
ITU-T
Number
Direction
102
—
103
To DSU/CSU
104
From DSU/CSU
105
To DSU/CSU
109
From DSU/CSU
113
To DSU/CSU
115
From DSU/CSU
Pin
8
2 (A)
9 (B)
4 (A)
11 (B)
3 (A)
10 (B)
5 (A)
12 (B)
7 (A)
14 (B)
6 (A)
13 (B)
A-7
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