Paradyne 7974 User Manual page 152

C. Connectors, Cables, and Pin Assignments
Table C-5. X.21 Cable Interface
C-8
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)
December 2001
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
Number
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)
7900-A2-GB21-20