IBM 3270 Manual page 226

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3274 Model 51C with a 1200-BPS Integrated Modem
Attached to a Switched Line with Auto-Answer (Countries
Other Than the U. S. and Canada That Do Not Use ·
Communication Cable Adapters)
Note: The communication cable labeled NONSWITCHED-A is not used in this
configur~tion.
0
Connect the Switched Lines (White and Red) wires of the section of the communica-
tion cable labeled' SWITCHED-B to the Telephone Line terminals of the PTT
connection block. Either wire may be
~onnected
to either terminal.
D
Connect the Telephone Set (Black and Yellow) wires of the section of the communica-
tion cable labeled SWITCHED-B to the Telephone Set terminals of the PTT connection
block. Either wire may be connected to either terminal.
Label-NONSWITCHED-A
3274 Model 51C
Switched Lines: White, Red
Telephone Set: Black, Yellow
Label-SWITCHED-B
Appendix F. 3274 Communication Cables
:F-17