Paradyne 3551 manual Sba, Sbb

Pin Assignments

Table D-5

EIA-232/V.24 Connector Pin Assignments

Pin	Circuit Name		Function
	EIA-232	CCITT
2	BA	103	Transmit Data (TXD)
3	BB	104	Received Data (RXD)
4	CA	105	Request-to-Send (RTS)
5	CB	106	Clear-to-Send (CTS)
6	CC	107	Data Set Ready (DSR)
7	AB	102	Signal Ground (SG)
8	CF	109	Received Line Signal Detect (LSD)
9	Ð	Ð	Positive Test Voltage
10	Ð	Ð	Negative Test Voltage
12	CI	112	Data Signal Rate Selector I ± DCE Source
			(alternate external control lead I)
13 1	Ð	Ð	Data Signal Rate Selector II ± DCE Source
			(alternate external control Lead II)
14	SBA	118	Secondary Transmit Data
15	DB	114	Transmitter Signal Element Timing ± DCE Source
16	SBB	119	Secondary Received Data
17	DD	115	Receiver Signal Element Timing ± DCE Source
18	LL	141	Local Loopback (LL)
19 1	Ð	Ð	Data Signal Rate Selector II ± DTE Source
			(alternate external control alarm Lead II)
20	CD	108.2	Data Terminal Ready (DTR)
21	RL	140	Remote Digital Loopback (RL)
23 1	CH	111	Data Signal Rate Selector I ± DTE Source
			(alternate external control alarm Lead I)
24	DA	113	Transmitter Signal Element Timing ± DTE Source
25	TM	142	Test Mode (TM)

1 Data Signal Rate Selector function is not available at this time. These leads can be used for the External Lead functions.

3550-A2-GB20-20 December 1996 D-5