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Cables and Pin Assignments
C-7
7975-A2-GB20-40
December 1998
Table C-3. X.21 Cable Interface
Signal
CCITT
Number Direction Pin
Signal Common 102 — 8
Transmitted Data 103 To DSU/CSU 2 (A)
9 (B)
Received Data 104 From DSU/CSU 4 (A)
11 (B)
Request-to-Send 105 To DSU/CSU 3 (A)
10 (B)
Data Channel Received Line Signal
Detector
109 From DSU/CSU 5 (A)
12 (B)
Transmit Signal Element Timing
(DTE Source)
113 To DSU/CSU 7 (A)
14 (B)
Receiver Signal Element Timing
(DCE Source)
115 From DSU/CSU 6 (A)
13 (B)