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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 recom-
mended 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/DigWirele
ss.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/attach-
match/FCC=03-168A1.pdf
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