Samsung SCH-R455ZKATFN User Manual
Page 111
Health and Safety Information 107
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 mobile device 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
mobile device 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 mobile device.
“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.
M3 + M2 = 5
T3 + T2 = 5