IBM 3270 Manual page 211

External Modem Cables
3274 Model 51 C with an External Modem Attached to a
Switched Line or Models JC, 21C, 3JC, and 51C Attached to a
Nonswitched Line (All Countries except United Kingdom
Date/ Modem)
Single Cable
3274 Models 1 C, 21 C, and 31 C
3274 Model 51C
You have received either a single or a dual (two cable sections joined by a connector)
communication cable with your 3274. Follow the instructions that apply to the cable
you received.
D
D
Label-MODEM
Set the TEST/OPER switch
D
to the OPER position. If you are in Japan, read the
note on this page first; then continue with "Thumbscrew Replacement Instructions."
Connect the cable plug
fl
to the modem or to the 3704/3705 Line Set 1 F Interface
Cable connector (for direct attachment to a 3704/3705). Tighten the thumbscrews
EJ
of the cable plug securely with your fingers.
Note (If you are in Japan):
The black thumbscrews on the communication cable shipped
to you are made with metric threads and are attachable to NTT modems or their equiva-
lents. If your modem is an IBM 3872 or 3874, or any other modem using an English-unit
connector, the black thumbscrews must be replaced with the gold thumbscrews (made
with English threads) provided in the customer envelope.
Thumbscrew Replacement Instructions:
D
•
Remove the black thumbscrews
El
by pulling them in the direction of the arrows.
(Do not be afraid to apply necessary force)
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