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. When you're talking on a cell phone, it's
recommended that you turn the BT (Bluetooth) mode off for HAC.
For information about hearing aids and digital wireless phones:
Wireless Phones and Hearing Aid Accessibility http://www.accesswireless.org/Home.aspx
FCC Hearing Aid Compatibility and Volume Control
http://www.fcc.gov/cgb/consumerfacts/hac_wireless.htm
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