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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.
For information about hearing aids and
digital wireless phones
FCC Hearing Aid Compatibility and Volume Control
http://www.fcc.gov/cgb/dro/hearing.html
Gallaudet University, RERC
http://tap.gallaudet.edu/DigWireless.KS/DigWireless.htm
Self Help for Hard of Hearing People Inc. [SHHH]
www.hearingloss.org/hat/TipsWirelessPhone.htm
The Hearing Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC=03-
168A1.pdf