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X.21 Interface
(DB-15 Female Connector)
(DTE /DCE Configuration)
Pin # Signal
1 Frame Ground
2 T (Transmit Data-A)
3 C (Control-A)
4 R (Receive Data-A)
5 I (Indication-A)
6 S (Signal Element Timing-A)
7 BT (Byte Timing-A)
8 SGND (Signal Ground)
9 T/ (Transmit Data-B)
10 C/ (Control-B)
11 R/ (Receive Data-B)
12 I/ (Indication-B)
13 S/ (Signal Element Timing-B)
14 BT/ (Byte Timing-B)