UTStarcom CDM7075 User Manual page 153

SAFETY
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are
likely to generate less interference to hearing
devices than phones that are not labeled. M4
is the better/higher of the two ratings.
Hearing devices may also be rated. Your hearing
device manufacturer or hearing health professional
may help you find this rating. Higher ratings mean that the hearing
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 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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