LG 235c Manual page 110

device is relatively immune to
interference noise. The
hearing aid and wireless
phone rating values are then
added together. A sum of 5 is
considered acceptable for
normal use. A sum of 6 is
considered for best use.
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
110