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Connector - ITU-TSS X.21

Common names: ITU-TSS (CCITT) X.21, ISO 4903

CORRECT?

15 PIN D-SUB MALE at the DTE (Computer).
15 PIN D-SUB FEMALE at the DCE (Modem).

	(at the DCE)
	(at the DTE)

Pin	Name	Direction	Description
1	n/a	---	Shield (Ground)
2	T (A)	Output	Transmit (A) (Data)
3	C (A)	Output	Control (A) (Control)
4	R (A)	Input	Receive (A) (Data)
5	I (A)	Input	Indication (A) (Control)
6	S (A)	Input	Signal Timing (A) (Timing)
7	B (A)	Input	Byte Timing (A) (Timing)
8	G	---	Ground (Ground)
9	T (B)	Output	Transmit (B) (Data)
10	C (B)	Output	Control (B) (Control)
11	R (B)	Input	Receive (B) (Data)
12	I (B)	Input	Indication (B) (Control)
13	S (B)	Input	Signal Timing (B) (Timing)
14	B (B)	Input	Byte Timing (B) (Timing)
15		---	unused

Note: Direction is DTE (Computer) relative DCE (Modem).

Source: HW-Book 2001-06-08
Last modified: 2007-06-27 14:22:58.0
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