3Com 32x, 52x manual Universal to X.21 Adapter Cable, 16UNIVERSAL to X.21 Adapter Cable

Connectors and Cables 2-19

UNIVERSAL to X.21 Adapter Cable

If you want to connect any of the SuperStack II bridge/routers documented in this guide to an X.21 DCE device, cable the connector marked UNIVERSAL using an X.21 adapter cable.

Figure 2-16 shows the pin assignments of the X.21 adapter cable.

To Universal port on bridge/router																			To modem/TA or CSU/DSU
1	2	3	4	5	6	7	8	9	10	11 12		13		14		15	16 17 18 19		1	2	3	4	5		6	7	8
20 21		22	23 24		25	26	27	28 29		30	31		32		33	34 35		36 37	9	10	11	12		13	14	15
		37-pin female connector																	15-pin male connector

Name	Abbr
Send Data	SD (A)
Send Data	SD (B)
Receive Data	RD (A)
Receive Data	RD (B)
Send Timing	ST (A)
Receive Timing	RT (A)
Send Timing	ST (B)
Receive Timing	RT (B)
Terminal Ready	TR (A)
Terminal Ready	TR (B)
Data Mode	DM (A)
Data Mode	DM (B)
Request to Send	EIA (A)
Receiver Ready	RR (A)
Clear to Send	CS (A)
Request to Send	EIA (B)
Receiver Ready	RR (B)
Clear to Send	CS (B)
Signal Ground	SG
Shield	Sheild

Pin		Pin	Abbr	Name
4		2	TA	Transmit Data (A)
22		9	TB	Transmit Data (B)
6		4	RA	Receive Data (A)
24		11	RB	Receive Data (B)
5		6	SA	Receive Clock
8
23		13	SB	Receive Clock
26
12		3	CA	Control (A)
30		10	CB	Control (B)
11		5	IA	Indicate (A)
29		12	IB	Indicate (B)
7
13
9
25
31
27
19	braid	8	GND	Ground
1		1	Sheild	Shield Drain

Figure 2-16UNIVERSAL to X.21 Adapter Cable