LG LG441G User Guide - Page 87
Solutions ATIS. The U and UT marks are, To ensure that the Hearing Aid Compatibility
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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 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/telephonesand-mobile-devices 85