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VX8300 109
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 is synonymous for T ratings. 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.
To ensure that the Hearing Aid Compatibility rating for your
phone is maintained, secondary transmitters such as Bluetooth
and WLAN components must be disabled during a call.
See Page 86 for instructions to disable these components.
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
Hearing Loss Association of America [HLAA]
http://www.hearingloss.org/learn/cellphonetech.asp
The Hearing Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-
03-168A1.pdf
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