Interface Pin-Out and Signal Names

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Interface Pin-Out and Signal Names

(Standard Interfaces and Their Relationship to Each Other)

CCITT(ITU) V.35 Digital Interface (M34) This interface provides balanced twisted-pair signaling for data and clock signals, but provides unbalanced single-ended signaling for all other control terms.
PIN	NAME	SIGNAL NAME	CCITT	DIRECTION
A	FG	FRAME GROUND	101	N/A
B	SG	SIGNAL GROUND	102	N/A
C	RTS	REQUEST TO SEND	105	TO MODEM
D	CTS	CLEAR TO SEND	106	FROM MODEM
E	DSR	DATA SET READY	107	FROM MODEM
F	DCD	DATA CARRIER DETECT	109	FROM MODEM
H	DTR	DATA TERMINAL READY	108.1/108.2	TO MODEM
J	RI	RING INDICATOR	125	FROM MODEM
K/M	F1	RESERVED FOR FUTURE INTERNATIONAL USE
L/N	F2	RESERVED FOR FUTURE INTERNATIONAL USE
R/T	RX	RECEIVE DATA	104	FROM MODEM
V/X	SCR	SERIAL CLOCK RECEIVE	115	FROM MODEM
Y/AA	SCT	SERIAL CLOCK TRANSMIT	114	FROM MODEM
P/S	TX	TRANSMIT DATA	103	TO MODEM
U/W	SCTE	SERIAL CLOCK TRANSMIT EXTERNAL	113	TO MODEM
Z/BB	F3	RESERVED FOR FUTURE INTERNATIONAL USE
CC/EE	F4
DD/FF	F5
HH/KK	N1	RESERVED FOR FUTURE INTERNATIONAL USE
JJ/LL	N2	RESERVED FOR FUTURE INTERNATIONAL USE
MM/NN	F	RESERVED FOR FUTURE INTERNATIONAL USE
Note: Double letters may be indicated by corresponding lower case letters on the connector.

EIA RS-530 DIGITAL INTERFACE (DB25) This interface provides balanced, twisted-pair signaling for all data and clock signals, and for most control item.
PIN	NAME	SIGNAL NAME	EIA	DIRECTION
1	FG	FRAME GROUND	AA	N/A
2/14	TX	TRANSMIT DATA	BA	TO MODEM
3/16	RS	RECEIVE DATA	BB	FROM MODEM
4/19	RTS	REQUEST TO SEND	CA	TO MODEM
5/13	CTS	CLEAR TO SEND	CB	FROM MODEM
6/22	DSR	DATA SET READY	CC	FROM MODEM
7	SG	SIGNAL GROUND	AB	N/A
8/10	CD	RX LINE SIGNAL DETECTOR	CF	FROM MODEM
24/11	SCTE	EXTERNAL CLOCK	DB	TO MODEM
15/12	SCT	TRANSMIT CLOCK	DB	FROM MODEM
17/9	SCR	RECEIVE CLOCK	DD	FROM MODEM
20/23	DTE	DATA TERMINAL READY	CF	TO MODEM
18	LL	LOCAL LOOPBACK		TO MODEM
21	RL	REMOTE LOOPBACK		TO MODEM
25	TM	TEST MODE		FROM MODEM

EIA RS-232C DIGITAL INTERFACE (DB25) This interface provides unbalanced, single-ended signaling for all data, clock and control items.
PIN	NAME	SIGNAL NAME	EIA	CCITT	DIRECTION
1	FG	FRAME GROUND	AA	101	N/A
2	TX	TRANSMIT DATA	BA	103	TO MODEM
3	RX	RECEIVE DATA	BB	104	FROM MODEM
4	RTS	REQUEST TO SEND	CA	105	TO MODEM
5	CTS	CLEAR TO SEND	CB	106	FROM MODEM
6	DSR	DATA SET READY	CC	107	FROM MODEM
7	SG	SIGNAL GROUND	AB	102	N/A
8	DCD	DATA CARRIER DETECT	CF	109	FROM MODEM
9		RESERVED FOR DATA SET TESTING
10		RESERVED FOR DATA SET TESTING
11		UNASSIGNED
12	(S)CO	SECONDARY CARRIER ON	SCF	122	FROM MODEM
13	(S)CTS	SECONDARY CLEAR TO SEND	SCB	121	FROM MODEM
14	(S)TX	SECONDARY TRANSMIT DATA	SBA	118	TO MODEM
15	SCT	SERIAL CLOCK TRANSMIT	DB	114	FROM MODEM
16	(S)RX	SECONDARY RECEIVE DATA	SBB	119	FROM MODEM
17	SCR	SERIAL CLOCK RECEIVE	DD	115	FROM MODEM