Samsung SGH-I777 User Manual page 211

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.
M3 + M2 =
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
T3 +
5
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.
HAC/Wi-Fi for Newer Technologies
This phone has been tested and rated for use with hearing
aids for some of the wireless technologies that it uses.
However, there may be some newer wireless technologies
T2 = 5
used in this phone that have not been tested yet for use with
hearing aids. It is important to try the different features of
this phone thoroughly and in different locations, using your
hearing aid or cochlear implant, to determine if you hear any
interfering noise. Consult your service provider or the
manufacturer of this phone for information on hearing aid
compatibility. If you have questions about return or exchange
policies, consult your service provider or phone retailer.
Health and Safety Information 205