3Com 3012 (3C13612) Describes V.35 DCE cable pinouts 35 DCE cable Pinouts, Signal DB-50 Direction

58CHAPTER A: OPTIONAL CABLE SPECIFICATIONS

Figure 33 V.35 DCE Cable Assembly

			V.35 Female
Enlarged A side	DB50 Male	Label	Enlarged B side

Table 34 describes V.35 DCE cable pinouts.

Table 34 V.35 DCE cable Pinouts

		Signal
DB-50	Signal	Direction	34PIN	Signal
31	CTS/RTS	<—	C	RTS
2	RTS/CTS	—>	D	CTS
26	DTR/DSR	—>	E	DSR
1	LL/DCD	—>	F	RLSD
6	DSR/DTR	<—	H	DTR
30	DCD/LL	<—	K	LT
20	RxD/TxD+	<—	P	SD+
44	RxD/TxD-	<—	S	SD-
15	TxD/RxD+	—>	R	RD+
39	TxD/RxD-	—>	T	RD-
19	RxC/TxCE+	<—	U	SCTE+
43	RxC/TxCE-	<—	W	SCTE-
17	NIL/RxC+	—>	V	SCR+
41	NIL/RxC-	—>	X	SCR-
16	TxCE/TxC+	—>	Y	SCT+
40	TxCE/TxC-	—>	AA	SCT-
50	GND	-	A	Shield_GND
7	GND	-	B	Circuit_GND
24	RxD-REST	GND	-	-
49	RxC-REST	GND	-	-
25	TxC-REST	GND	-	-

X.21 DTE Cable Pinouts Figure 34 illustrates the X.21 DTE cable.