Paradyne 3910 Table C-1 EIA-232-D Pin Assignments Name, Signal Circuit Function Source

COMSPHERE 3900 Series Modems

EIA-232-D Pin Assignments

Table C-1 lists the EIA-232-D pin assignments for the modem.

Table C-1

EIA-232-D Pin Assignments

Pin	Name	EIA	CCITT	Signal	Circuit Function
		Circuit		Source
1	Ð	AA	101	Ð	Shield
2	TXD	BA	103	DTE	Transmit Data
3	RXD	BB	104	DCE	Receive Data
4	RTS	CA	105	DTE	Request-to-Send
5	CTS	CB	106	DCE	Clear-to-Send
6	DSR	CC	107	DCE	Data Set Ready
7	SG	AB	102	Ð	Signal Ground
8	LSD	CF	109	DCE	Line Signal Detect
9	+12V	Ð	Ð	Ð	Reserved for test purposes (may be used to drive
					one RS-232 load)
10	±12V	Ð	Ð	Ð	Reserved for test purposes (may be used to drive
					one RS-232 load)
11	Ð	Ð	Ð	Ð	Unassigned
12	CT112	CI	112	DCE	Data Signal Rate Select
13	Ð	Ð	Ð	Ð	Reserved for future function
14	Ð	Ð	Ð	Ð	Reserved for future function
15	TXC	DB	114	DCE	Transmit Clock
16	Ð	Ð	Ð	Ð	Reserved for future function
17	RXC	DD	115	DCE	Receive Clock
18	CT141	LL	141	DTE	Local Loopback
20	DTR	CD	108	DTE	Data Terminal Ready
21	CT140	RL	140	DTE	Remote Loopback
22	RI	CE	125	DCE	Ring Indicator
23	CT111	CH	111	DTE	Data Rate Selector
24	XTXC	DA	113	DTE	External Clock
25	TEST	TM	142	DCE	Test Mode

C-2 November 1996 3910-A2-GN32-30