3Com S330 manual Rts

22CHAPTER 1: SYSTEM DESCRIPTION

Table 5 PathBuilder S310 System Specifications

Connector type at end of	DB-25 subminiature,
EIA530 cable	female for DCE, male for DTE
Connector pinouts		A Side	B Side
	Chassis Ground	1
	Send Data	2	14
	Send Timing	15	12
	Receive Data	3	16
	Req to Send	4	19
	Receive Timing	17	9
	Clear to Send	5	13
	Terminal Ready	20	23
	Receiver Ready	8	10
	Terminal Timing	24	11
	Signal Ground	7

Connector type at end of X.21 cable

X.21 DTE cable pinouts

(60-pin connector) to DB-15 male

DB-15 subminiature,

female for DCE, male for DTE

Signal	Pin # on	Pin # on	Direction (for
Name	60-pin	DB-15	serial port)
Frame GND	46	1
Circuit GND	15	8
RTS	9,10	3,10	OUT
CTS	1,2	5,12	IN
DSR			IN
DCD (not used; tristate when in DTE mode)
DTR			OUT
LL (not used)			OUT
SD+	11	2	OUT
SD-	12	9	OUT
RD+	28	4	IN
RD-	27	11	IN
SCTE+			OUT
SCTE-			OUT
SCR+	26	6	IN
SCR-	25	13	IN
SCT+			IN
SCT-			IN
Shorting
GR 1	47,48,49
Shorting
GR 2	51, 52

(continued)