“Normal usage” in this context is
defined as a signal quality that is
acceptable for normal operation.
The M mark is intended to be
synonymous with the U mark. The T
mark is intended to be synonymous
with the UT mark. The M and T marks
are recommended by the Alliance for
Telecommunications Industries
Solutions (ATIS). The U and UT marks
are referenced in Section 20.19 of the
FCC Rules. The HAC rating and
measurement procedure are
described in the American National
Standards Institute (ANSI) C63.19
standard.
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Additional safety information
