IBM 3270 Manual page 216

I '
I
I
·~
u
X.21 Cable
3274 Model 51C with X.21 Attached to a Switched or
Nonswitched Line or Models JC, 2JC, and 3JC with
X.21 Attached to a Nonswitched Line
D
Set the TEST/OPER switch
D
to the OPER position.
0
Connect the cable plug
·fl
on the long section of the communication cable to the
socket
IJ
on the short section of the communication cable. Tighten the thumb-
screws
IJ
of the cable socket
IJ
securely with your fingers.
D
Connect the cable plug
g
to the modem. Tighten the thumbscrews
m
of the cable
plug
D
securely with your fingers. .
3274 Models 1 C, 21 C, and 31 C
OR~
Appendix F. 3274 Communication Cables
·F.~7