American Telecom AM64/128A manual byte timing cable 15 way to 15 way D type plugs

AM64/128A User Manual Appendix E - Private digital circuits

2. X.21 byte timing cable - (15 way to 15 way D type plugs).

CCITT circuit	Timing Source (DCE)	Timing Sink (DTE)	CCITT circuit
T-A	2	4	R-A
T-B	9	11	R-B
R-A	4	2	T-A
R-B	11	9	T-B
B-A	14	1	SEXT-A
B-B	7	15	SEXT-B
I-A	5	3	C-A
I-B	12	10	C-B
C-A	3	5	I-A
C-B	10	12	I-B
GND	8	8	GND

3. V.24 / V.28 bit timing cable - (25 way to 25 way D type plugs).

CCITT circuit	Timing Source (DCE)	Timing Sink (DTE)	CCITT circuit
103	2	3	104
104	3	2	103
105	4	8	109
102	7	7	102
109	8	4	105
115	17	24	113

4. V.35 bit timing cable - (34 way to 34 way MRAC plugs).

CCITT circuit	Timing Source (DCE)	Timing Sink (DTE)	CCITT circuit
103-A	P	R	104-A
103-B	S	T	104-B
104-A	R	P	103-A
104-B	T	S	103-B
105	C	F	109
109	F	C	105
115-A	V	U	113-A
115-B	X	W	113-B
GND	B	B	GND

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