LG LS777 User Manual page 160

that are rated have the rating on their box or a label located on the box. The ratings are not guarantees.
Results will vary depending on the user's hearing device and hearing loss. If your hearing device happens
to be vulnerable to interference, you may not be able to use a rated phone successfully. Trying out the
phone with your hearing device is the best way to evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to generate less interference
to hearing devices than phones that are not labeled. M4 is the better/higher of the two ratings.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to generate less interference to
hearing devices than phones that are not labeled. T4 is the better/ higher of the two ratings.
Hearing devices may also be rated. Your hearing device manufacturer or hearing health professional may
help you find this rating. Higher ratings mean that the hearing device is relatively immune to interference
noise. The hearing aid and wireless phone rating values are then added together. A sum of 5 is
considered acceptable for normal use. A sum of 6 is considered for best use.
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's 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.
For information about hearing aids and digital wireless phones
Wireless Phones and Hearing Aid Accessibility
http://www.accesswireless.org/
Gallaudet University, RERC
http://tap.gallaudet.edu/Voice/
FCC Hearing Aid Compatibility and Volume Control
http://www.fcc.gov/cgb/dro/hearing.html
The Hearing Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-03-168A1.pdf
Hearing Loss Association of America [HLAA]
http://hearingloss.org/content/telephones-and-mobiledevices
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