SAFETY
| 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. |
SAF | The M mark is intended to be synonymous with the |
ET | U mark. The T mark is intended to be synonymous |
Y | 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.
When you're talking over the cell phone, it's recommended you'd turn the Bluetooth mode off for HAC.
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
HLAA (Hearing Loss Association of America)
http://www.hearingloss.org/learn/cellphonetech.asp
The Hearing Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/attachmatc
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