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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.
Figure 2-16 UNIVERSAL to X.21 Adapter Cable
Abbr
SD (A)
SD (B)
RD (A)
RD (B)
ST (A)
RT (A)
ST (B)
RT (B)
TR (A)
TR (B)
DM (A)
DM (B)
EIA (A)
RR (A)
CS (A)
EIA (B)
RR (B)
CS (B)
SG
Sheild
Name
Send Data
Send Data
Receive Data
Receive Data
Send Timing
Receive Timing
Send Timing
Receive Timing
Terminal Ready
Terminal Ready
Data Mode
Data Mode
Request to Send
Receiver Ready
Clear to Send
Request to Send
Receiver Ready
Clear to Send
Signal Ground
Shield
Abbr
TA
TB
RA
RB
SA
SB
CA
CB
IA
IB
GND
Sheild
Name
Transmit Data (A)
Transmit Data (B)
Receive Data (A)
Receive Data (B)
Receive Clock
Receive Clock
Control (A)
Control (B)
Indicate (A)
Indicate (B)
Ground
Shield Drain
braid
37-pin female connector
15-pin male connector
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
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15
Pin
4
22
6
24
5
8
23
26
12
30
11
29
7
13
9
25
31
27
19
1
Pin
2
9
4
11
6
13
3
10
5
12
8
1
SS2TRHWBook Page 19 Monday, May 5, 1997 3:11 PM