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Safety
138
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 Uni
versity, RERC
http://tap.gallaudet.edu/Voice/
FCC Hearing
Aid Compatibility and Volume Control
https://www.fcc.gov/general/hearing-aid-compatibility-and-volume-
control
The Hearing
Aid Compatibility FCC Order
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-03-168A1.pdf
Hearing L
oss Association of America [HLAA]
http://hearingloss.org/content/telephones-and-mobile-devices
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