IBM 3270 Manual page 230

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Communication Cable Adapters for Countries Other Than
the U. S. and Canada
These adapters are for use with integrated modems in countries other than the U.S.
and Canada. The adapter is installed by inserting the four-prong plug of the
communication cable from the 3274 into the four-pin receptacle on the adapter.
The other end of the adapter is attached to the communications line.
Finland Switched Line Adapter
Finland Nonswitched Line Adapter
Appendix F. 3274 Communication Cables
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