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IBM 3720 Models 1, 2, 11, and 12
IBM 3721 Models 1 and 2
Communication Controllers


System/370, 30xx, 4300,
and 9370 Processors

Publication Number File Number
GA33-0060-2 3720/3721-09
Federal Communications Commission (FCC) Statement

Warning: This equipment generates, uses, and can radiate radio frequency energy and if not installed and
used in accordance with the instruction manual, may cause interference to radio communications. It has
been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of
Part 15 of FCC rules, which are designed to provide re~sonable protection against such interference when
operated in a commercial environment. Operation of this equipment in a residential area is likely to cause
interference in which case the user at his own expense will be required to take whatever measures may be
required to correct the interference.

The above FCC statement applies only to the IBM 3720 and 3721 Communication Controllers used in the
USA and having a label on the back that indicates compliance.

Third Edition (February 1988)

This major revision replaces and obsoletes GA33-0060-1. It reflects new enhancements to the IBM 3720
Communication Controller operation. These enhancements comprise the ability to: