LG LG235C - Manual (Page 97)

In the above example, if a
hearing aid meets the M2
level rating and the wireless
phone meets the M3 level
rating, the sum of the two
values equal M5. This is
synonymous for T ratings.
This should provide the
hearing aid user with “normal
usage” while using their
hearing aid with the particular
wireless phone. “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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