Patton electronic 1090 user manual APPENDIX D DB-15F Connector-DCE Setting X.21 Interface

APPENDIX D

DB-15F Connector-DCE Setting

(X.21 Interface)

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)

Note: X.21 uses balanced data and control signals.

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