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 phone:
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/TipsWirelessPhones.htm
The Hearing Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/attachmatch/
FCC-03-168A1.pdf
226
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