Operation Manual

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Appendix
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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 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 dened 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 75 for instructions to disable these
components.